Carbonyl Dihalide Reactant (e.g., Phosgene, Etc.) Patents (Class 560/347)
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Publication number: 20100298596Abstract: Isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), are produced by reaction of amines dissolved in a solvent with phosgene in the same solvent to form the corresponding isocyanates. Hydrogen chloride and excess phosgene are subsequently removed from the reaction mixture to obtain a crude isocyanate-containing solution. Subsequently, the crude isocyanate-containing solution is separated by distillation into isocyanates and solvent. The solvent is recycled and used for the production of solutions of the amines and of phosgene. The solvent being recycled is treated to reduce the phosgene and diisocyanate contents before being used for the production of the solution of the amine.Type: ApplicationFiled: August 6, 2010Publication date: November 25, 2010Applicant: Bayer MaterialScience AGInventors: Berthold Keggenhoff, Heinrich Lokum, Matthias Böhm
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Publication number: 20100285964Abstract: The present invention relates to salts of 2-iodo-N-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoyl]benzenesulfonamide, to processes for their preparation and to their use as herbicides, in particular as herbicides for the selective control of unwanted harmful plants in crops of useful plants, permanent crops or on non-crop land, and also as plant growth regulators, on their own or with safeners and/or in combination with other herbicides, to their use for controlling unwanted harmful plants (such as, for example, broad-leaved/weed grasses) in specific crop plants or as crop protection regulators, for simultaneous and/or sequential application, either as a readymix or as a tank mix.Type: ApplicationFiled: October 22, 2008Publication date: November 11, 2010Applicant: BayerCropScience AGInventors: Christian Waldraff, Klaus-Helmut Mueller, Ernst Rudolf Gesing, Jan Dittgen, Dieter Feucht, Hansjoerg Kraehmer, Jeffrey Martin Hills, Georg Bonfig-Picard, Martin Hess, Dominique Schreiber, Hugh Christopher Rosinger
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Patent number: 7813839Abstract: A production process such as an isocyanate production process, conducted with a production facility having (a) at least two incoming streams, b) at least one exit stream and c) at least one inner recycling stream is controlled by adjusting at least one incoming stream amount by means of regulating controls to control the exit stream concentration and/or amount.Type: GrantFiled: January 22, 2007Date of Patent: October 12, 2010Assignee: Bayer MaterialScience AGInventors: Jochen Mahrenholtz, Stefan Wershofen, Gerhard Then, Sabine Pegel, Jun Wang, Erman Sevinc, Richard H. Guhl
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Publication number: 20100217035Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.Type: ApplicationFiled: September 11, 2008Publication date: August 26, 2010Applicant: BASF SEInventors: Carsten Knoesche, Andreas Woelfert, Torsten Mattke, Eckhard Stroefer, Heinrich-Josef Blankertz, Bernhard Geissler
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Publication number: 20100210870Abstract: The present invention relates to a process for preparing isocyanates.Type: ApplicationFiled: August 13, 2008Publication date: August 19, 2010Applicant: BASF SEInventors: Gerhard Olbert, Torsten Mattke, Carsten Knoesche, Andreas Daiss, Jens Denecke
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Publication number: 20100209380Abstract: The disclosure relates to biocompatible components useful for forming compositions for use as medical/surgical synthetic adhesives and sealants. Biocompatible components of the present disclosure may include a polymeric polyol core, which may be treated with a nitroaryl compound to form a nitro ester. The resulting nitro ester groups may be reduced to form amino groups which, in turn, may be treated to form isocyanate groups. The resulting isocyanate may then be reacted with a second component to form adhesive and/or sealant compositions.Type: ApplicationFiled: February 2, 2010Publication date: August 19, 2010Inventors: Mbiya Kapiamba, Jack Kennedy, Roland Ostapoff
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Publication number: 20100204510Abstract: Process for the production of di- and poly(diamino diphenyl methane) comprising the steps of (a) reacting aniline and formaldehyde in the presence of an acid catalyst to produce a reaction mixture containing di- and polyamines; (b) neutralising the reaction mixture containing di- and polyamines; (c) separating the neutralised reaction mixture into an organic phase containing di- and polyamines and an aqueous phase; (d) further treating the organic phase separated off in step (c) by (d1) washing with water followed by (d2) separating the washed mixture into an organic phase and an aqueous phase and (d3) further fractionation of the organic phase to produce purified di- and polyamines on the one hand and aniline/water on the other hand; (e) further treating the aqueous phase separated off in step (c) by (e1) washing with aniline followed by (e2) separating the washed mixture into an aqueous phase and an organic phase and (e3) further treatment of the aqueous phase to remove the aniline thereby leaving an efflueType: ApplicationFiled: August 28, 2008Publication date: August 12, 2010Inventors: Robert Henry Carr, Johannes Lodewijk Koole, Willem Van Der Borden
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Patent number: 7767160Abstract: An apparatus for continuously producing polyisocyanate is provided for quickly contacting polyamine and carbonyl chloride in order to suppress an undesirable reaction between polyamine and polyisocyanate so that a by-product can be reduced and the yield of polyisocyanate can be improved. In a circulatory line 7, a material-mixing portion 8, a high-shear pump 3, a reactor 4, a liquid-feeding pump 5 and a cooler 6 are interposed in series along the direction of the flow of a reaction solution, thereby forming a closed line. In this apparatus 1, after polyamine and carbonyl chloride are supplied in the material-mixing portion 8, the reaction solution is sheared by the high-shear pump 3 in a state where the contact of the polyamine with the reaction solution is minimized. Thus, the formation of a urea compound as a by-product can be suppressed and the yield of polyisocyanate can be improved.Type: GrantFiled: March 30, 2006Date of Patent: August 3, 2010Assignee: Mitsui Chemicals, Inc.Inventors: Masaaki Sasaki, Kouji Maeba, Mitsunaga Douzaki, Hirofumi Takahashi, Osamu Hososaka
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Patent number: 7754915Abstract: A process for preparing isocyanates in the gas phase, in which the mixing of the reactants and thus the reaction conditions are significantly improved by means of hydrodynamic measures such as increasing the turbulence of the feed stream in the central nozzle. As a consequence, the necessary residence time in the reactor and thus the length of the reactor are reduced and the formation of polymeric by-products which lead to caking in the reactor and a shortening of the operating period of the reactors is avoided.Type: GrantFiled: October 20, 2004Date of Patent: July 13, 2010Assignee: Bayer MaterialScience AGInventors: Heiko Herold, Volker Michele, Werner König
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Publication number: 20100160673Abstract: Primary isocyanates are produced by reacting the corresponding primary amine(s) with phosgene at a temperature above the boiling temperature of the amine(s) in a tube reactor with a reaction space. In this tube reactor, at least one educt stream P containing phosgene and at least one educt stream A containing the amine(s) are fed to the reaction space via a nozzle arrangement. The nozzle arrangement includes a number of n?1 nozzles aligned parallel to the axis of rotation of the tube reactor and a free space surrounding the nozzles. One of the educt streams A or P is fed to the reaction space via the nozzles and the other educt stream is fed to the reaction space via the free space surrounding the nozzles. The reaction space contains at least one moving mixing device.Type: ApplicationFiled: December 14, 2009Publication date: June 24, 2010Applicant: Bayer MaterialScience AGInventors: Rainer Bruns, Fritz Pohl, Friedhelm Steffens, Volker Michele
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Publication number: 20100160674Abstract: Meta-toluene-diisocyanate is produced by reacting meta-toluenediamine with phosgene in the gas phase. The meta-toluenediamine to be vaporized for use in this phosgenation process must contain less than 0.5 wt. % of toluenediamine residue, a total of less than 0.2 wt. % of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals. At least 0.1 wt. % of the liquid meta-toluenediamine being to be vaporized must not be vaporized. This non-vaporized content of the meta-toluenediamine must not be fed to the phosgenation reactor.Type: ApplicationFiled: December 14, 2009Publication date: June 24, 2010Applicant: Bayer MaterialScience AGInventors: Klaus Biskup, Rainer Bruns, Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Fritz Pohl, Andreas Rausch, Friedhelm Steffens
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Publication number: 20100152484Abstract: Aromatic isocyanates are produced by reacting one or more aromatic primary amines with phosgene in the gas phase. The phosgene and primary aromatic amine(s) are reacted at a temperature above the boiling temperature of the amine(s) in a reactor having a reaction space which is essentially rotationally symmetric to the direction of flow. The flow fate, averaged over the cross-section, of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is between 4 and 80 % is not more than 8 m/sec. The flow rate averaged over the cross-section of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is 4 to 80 % is always below the flow rate averaged over the cross-section at the start of this section.Type: ApplicationFiled: December 7, 2009Publication date: June 17, 2010Applicant: Bayer MaterialScience AGInventors: Klaus Biskup, Rainer Bruns, Wolfgang Lorenz, Fritz Pohl, Friedhelm Steffens, Volker Michele
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Publication number: 20100137634Abstract: The present invention relates to a hole-jetting type reactor and its applications, in particular to a process for the production of isocyanates by the phosgenation of aliphatic or aromatic diamines or triamines in the gas phase using this reactor. The present invention achieves a good mixing and reacting result of the gas-phase phosgenation reaction at a high temperature by improving the mixing of reactants in the reactor to reduce the possibility of forming swirls and eliminate negative pressure produced at a local jet area, which can finally reduce back-mixing and formation of solid by-products.Type: ApplicationFiled: August 21, 2007Publication date: June 3, 2010Inventors: Jiansheng Ding, Yong hua Shang, Deqiang Ma, Jingquan Hao, Peicheng Luo, Shuang Hu
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Publication number: 20100130772Abstract: An apparatus for mixing at least first and second fluid, comprising: (a) a first nozzle comprising a first flow duct defining a first flow chamber, and having a first nozzle tip having a first discharge opening; and (b) a second nozzle comprising a second flow duct defining a second flow chamber, and having a second nozzle tip having a second discharge opening; wherein said first flow duct and said second flow duct are spirally wrapped each over the other. The invention also provides a process for mixing fluids, especially adapted for the production of isocyanates, and that is notably carried out in the apparatus of the invention.Type: ApplicationFiled: March 6, 2006Publication date: May 27, 2010Applicant: Huntsman International LLCInventors: Neal Anthony Grob, James Laverme Allbright
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Patent number: 7709679Abstract: The invention provides a process for the simultaneous preparation of 4,4?-diphenylmethanediamine and also diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates, which comprises the steps a) preparation of a mixture of diphenylmethanediamine and polyphenylenepolymethylenepolyamines by acid condensation of aniline and formaldehyde and subsequent work-up of the mixture, b) splitting-off of part of the mixture prepared in step a), c) distillation of the mixture separated off in step b) in a column, d) recirculation of the bottom product from step c) to the end product from step a) and condensation of the overhead product from step c), e) distillation of the overhead product from step c) in a column, f) recirculation of the overhead product from step e) to the end product from step a), g) isolation of the 4,4?-diphenylmethanediamine obtained as bottom product in step e), h) reaction of the mixture from step a) with phosgene and subsequent work-up of the reaction product.Type: GrantFiled: January 12, 2007Date of Patent: May 4, 2010Assignee: BASF AktiengesellschaftInventors: Michael Bock, Hans-Juergen Pallasch, Filip Deberdt, Johnny Moors
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Publication number: 20100076218Abstract: The invention relates to a process for preparing isocyanates in the gas phase.Type: ApplicationFiled: November 6, 2007Publication date: March 25, 2010Applicant: BASF SEInventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
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Publication number: 20100056822Abstract: The invention relates to a process for preparing isocyanates in the gas phase.Type: ApplicationFiled: November 6, 2007Publication date: March 4, 2010Applicant: BASF SEInventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
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Publication number: 20100048942Abstract: The present invention relates to a process for preparing isocyanates in particular apparatuses.Type: ApplicationFiled: November 30, 2007Publication date: February 25, 2010Applicant: BASF SEInventors: Carsten Knoesche, Torsten Mattke
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Publication number: 20100041914Abstract: The present invention relates to a process for preparing isocyanates.Type: ApplicationFiled: November 6, 2007Publication date: February 18, 2010Applicant: BASF SEInventors: Andreas Woelfert, Andreas Daiss, Torsten Mattke
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Publication number: 20100041915Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.Type: ApplicationFiled: December 12, 2007Publication date: February 18, 2010Applicant: BASF SEInventors: Andreas Woelfert, Carsten Knoesche, Torsten Mattke, Eckhard Stroefer
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Publication number: 20100010257Abstract: Isocyanates are produced in the gas phase and by-products such as ammonium halides are selectively separated from the gas phase by desublimation.Type: ApplicationFiled: May 26, 2009Publication date: January 14, 2010Applicant: Bayer MaterialScience AGInventors: Sven Michael Hansen, Ralf Schneider, Bernd Schwethelm, Rolf Schiefer, Jurgen Dreher
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Patent number: 7645900Abstract: The present invention relates to a process for the preparation of isocyanates by reacting the appropriate amines with phosgene, condensing the gas mixture thereby obtained, stripping the liquid phase thereby obtained and returning the solvent so retained in liquid form to the reaction stage. The gaseous constituents are then purified further in an absorption process.Type: GrantFiled: February 17, 2009Date of Patent: January 12, 2010Assignee: Bayer MaterialScience AGInventors: Wolfgang Lorenz, Matthias Boehm, Richard Adamson, Friedhelm Steffens, Anke Hielscher
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Publication number: 20090292100Abstract: The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof.Type: ApplicationFiled: July 25, 2007Publication date: November 26, 2009Applicant: BASF SEInventors: Martin Fiene, Eckhard Stroefer, Wolfgang Siegel, Stephan Freyer, Oskar Zelder, Gerhard Schulz
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Publication number: 20090281350Abstract: The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the amine or a mixture of amine and a solvent is mixed in the form of an aerosol with gaseous phosgene and the amine is subsequently reacted with phosgene.Type: ApplicationFiled: July 5, 2007Publication date: November 12, 2009Applicant: BASF SEInventors: Carsten Knoesche, Eckhard Stroefer, Dieter Stuetzer, Bernd Sachweh, Markus Lisenbuehler, Andreas Woelfert
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Patent number: 7615662Abstract: Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling takes place in the cooling stretch in one stage in two or more cooling zones connected in series.Type: GrantFiled: December 11, 2007Date of Patent: November 10, 2009Assignee: Bayer MaterialScience AGInventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Herbert Stutz
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Publication number: 20090240076Abstract: The invention relates to a process for preparing methylenediphenyl diisocyanates which comprises at least the steps: A) reaction of aniline with formaldehyde in the presence of hydrochloric acid as catalyst to give a mixture of diamines and polyamines of the diphenylmethane series (MDA) and subsequent at least partial neutralization of the hydrochloric acid by means of alkali metal hydroxide, B) reaction of the mixture of diamines and polyamines of the diphenylmethane series obtained in step A) with phosgene to give a mixture of diisocyanates and polyisocyanates of the diphenylmethane series (MDI) and hydrogen chloride, wherein C) the hydrochloric acid which has been neutralized in step A) is separated off in the form of a solution containing alkali metal chloride and is subsequently at least partly fed to an electrochemical oxidation to form chlorine, alkali metal hydroxide and optionally hydrogen and D) at least part of the chlorine produced in step C) is used for preparing the phosgene used in step B).Type: ApplicationFiled: February 27, 2009Publication date: September 24, 2009Applicant: Bayer MaterialScience AGInventors: Fritz Pohl, Andreas Bulan, Rainer Weber, Richard Adamson, Matthias Bohm, Christian Six
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Publication number: 20090240077Abstract: The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline.Type: ApplicationFiled: March 17, 2009Publication date: September 24, 2009Applicant: Bayer MaterialScience AGInventors: Stefan Wershofen, Heinz-Herbert Muller, Richard Adamson, Fritz Pohl, Knut Sommer
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Patent number: 7584629Abstract: The invention relates to a process for the partial or complete separation of a mixture comprising hydrogen chloride and phosgene, possibly solvents and possibly low boilers and inerts as are typically obtained in the preparation of isocyanates by reaction of amines with phosgene, which comprises firstly carrying out a partial or complete condensation of phosgene, then a distillation or stripping step in a column to remove the hydrogen chloride from the bottom product phosgene and subsequently a scrub of the top product hydrogen chloride by means of the process solvent to absorb the phosgene in the process solvent. An after-purification by means of adsorption on activated carbon or by another suitable method can subsequently be carried out to remove solvent residues.Type: GrantFiled: December 13, 2003Date of Patent: September 8, 2009Assignee: BASF AktiengesellschaftInventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Hans-Juergen Pallasch, Peter Van Den Abeel, Filip Deberdt, Jan D. Jacobs, Wolfgang Mackenroth
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Publication number: 20090221846Abstract: The present invention relates to a process for preparing isocyanates and an apparatus suitable for this purpose, and also its use.Type: ApplicationFiled: August 23, 2006Publication date: September 3, 2009Applicant: BASF SEInventors: Andreas Wölfert, Carsten Knösche, Andreas Daiss, Tsung-Chieh Cheng, Torsten Mattke, Eckhard Stroefer
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Publication number: 20090209784Abstract: The present invention relates to a process for the preparation of isocyanates by reacting the appropriate amines with phosgene, condensing the gas mixture thereby obtained, stripping the liquid phase thereby obtained and returning the solvent so retained in liquid form to the reaction stage. The gaseous constituents are then purified further in an absorption process.Type: ApplicationFiled: February 17, 2009Publication date: August 20, 2009Applicant: Bayer MaterialScience AGInventors: Wolfgang Lorenz, Matthias Boehm, Richard Adamson, Friedhelm Steffens, Anke Hielscher
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Publication number: 20090175121Abstract: The invention relates to a mixer reactor of the rotor-stator type. This mixer reactor comprises a substantially rotationally symmetric housing which has a distributing chamber, a mixing chamber, a front plate that modifies the cross-section of the housing between these two chambers, and there are separate inlets into the mixing chamber for at least two substances and an outlet for removing the mixed material or product. The inlet for the first substance is provided in the axis of rotation of the mixing chamber. Two or more channels are aligned radially outward from this inlet, and the first substance is transported through these channels and into the mixing chamber. The inlet for the at least second substance is constructed in the form of a plurality of openings in the front plate, these inlet openings being are arranged rotationally symmetrically to the axis of rotation. Each of these inlet openings for the at least second substance has a corresponding pin which can be displaced in the axial direction.Type: ApplicationFiled: December 16, 2008Publication date: July 9, 2009Inventors: Andreas Rausch, Christian Steffens, Dietmar Wastian, Manfred Keller-Killewald, Matthias Bohm, Joachim Ritter, Marcus Grunewald
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Patent number: 7547801Abstract: Isocyanates are produced by reacting an organic amine with phosgene in process which includes at least three stages. The first stage is carried out in a dynamic mixer. The second stage is carried out in at least one reactor. The third stage is carried out in at least one material separating apparatus. The pressure in the reactor of the second stage must be greater than or equal to the pressure in the dynamic mixer. The pressure in the third stage material separating apparatus must be lower than the pressure in the second stage reactor.Type: GrantFiled: June 26, 2006Date of Patent: June 16, 2009Assignees: Bayer MaterialScience LLC, Bayer MaterialScience AGInventors: Fritz Pohl, Ricardo Serra, Matthias Ehlers, Jeffrey S. Bolton, Gary B. Solak, Kirk J. Bourgeois, Gregory L. McCullough, Amber R. Hicks, Richard G. Hillman, James E. Sager, Xiaoyan Wang, Spotswood Miller, Ralf Ochel, Sara DeLucia
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Publication number: 20090149672Abstract: Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.Type: ApplicationFiled: November 20, 2008Publication date: June 11, 2009Inventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Lars Padeken
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Publication number: 20090149671Abstract: The invention relates to the preparation of isocyanates by phosgenation of amines in the gas phase, with these isocyanates having a comparatively low proportion of color-imparting compounds.Type: ApplicationFiled: November 12, 2008Publication date: June 11, 2009Inventors: Herbert Stutz, Reinhard Halpaap, Tilak Suren Lewkebandara
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Patent number: 7541487Abstract: An isocyanate is produced by reacting a primary amine with phosgene in the gas phase above the boiling point of the amine over an average contact time of 0.05 to 15 seconds under adiabatic conditions.Type: GrantFiled: December 11, 2007Date of Patent: June 2, 2009Assignee: Bayer MaterialScience AGInventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Herbert Stutz
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Publication number: 20090112017Abstract: The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene in the presence of a solvent, wherein ionic liquids are used as solvents.Type: ApplicationFiled: October 27, 2005Publication date: April 30, 2009Applicant: BASF AktiengessellschaftInventors: Martin Sesing, Thorsten Rohde, Eckhard Stroefer, Jochem Henkelmann
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Publication number: 20090112018Abstract: The invention provides a process for preparing isocyanates by reacting the corresponding amines with phosgene in the presence of solvents, wherein compounds which form salt melts with hydrogen chloride are used as solvents.Type: ApplicationFiled: October 22, 2005Publication date: April 30, 2009Applicant: BASF AktiengesellschaftInventors: Martin Sesing, Hartwig Voss, Eckhard Stroefer, Thorsten Rohde, Andreas Wolfert
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Patent number: 7524405Abstract: The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.Type: GrantFiled: December 13, 2003Date of Patent: April 28, 2009Assignee: BASF AktiengesellschaftInventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Hans-Juergen Pallasch, Peter Van Den Abeel, Filip Deberdt, Jan D. Jacobs, Wolfgang Mackenroth
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Publication number: 20090054684Abstract: Processes comprising providing an amine reactant, and reacting the amine reactant with a stream of phosgene in a reaction zone to form a product comprising a corresponding isocyanate, wherein the phosgene stream has a CO content of 0.5% by weight or more.Type: ApplicationFiled: August 21, 2008Publication date: February 26, 2009Applicant: Bayer MaterialScience AGInventors: Herbert Stutz, Frank Diehl, Alexander Schwarz, Rainer Bruns
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Patent number: 7495124Abstract: The present invention relates to a process for the production of MDI fractions containing 2,4?-MDI, and in which the 2,2?-MDI component from the MDA production is largely removed from the isomer mixture. Highly reactive monomeric MDI products can be produced in this way. These MDI products are characterised in their processing by significantly reduced emissions of MDI monomers.Type: GrantFiled: February 1, 2005Date of Patent: February 24, 2009Assignee: Bayer MaterialScience AGInventors: Hans-Georg Pirkl, Jeffrey Bolton, Walter Meckel, Ulrich Wolf, Matthias Wintermantel, Jochen Mahrenholtz
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Patent number: 7488842Abstract: The invention relates to a process for preparing isocyanates by reacting amines with phosgene in the gas phase in a reaction zone, with the reaction mixture being passed through a zone into which a liquid is sprayed to stop the reaction, wherein the reaction mixture is passed through a zone having a reduced flow cross section between the reaction zone and the zone into which the liquid is sprayed.Type: GrantFiled: June 22, 2005Date of Patent: February 10, 2009Assignee: BASF AktiengesellschaftInventors: Carsten Knoesche, Andreas Woelfert, Andreas Daiss
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Patent number: 7482481Abstract: In a process for preparing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent, use is made of from 0.01 to 50 mol % of a phosphine oxide, based on the total amount of primary amine and isocyanate formed in the reaction solution.Type: GrantFiled: October 17, 2002Date of Patent: January 27, 2009Assignee: BASF AktiengesellschaftInventors: Thorsten Rohde, Armin Stamm, Jochem Henkelmann
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Publication number: 20080275269Abstract: 4,4?-diphenylmethane diisocyanate is produced at two different sites by a) reacting aniline and formaldehyde in the presence of an acid catalyst to produce a mixture of diamines and polyamines of the diphenylmethane series at a first production site, b) these diamines and polyamines are then reacted with phosgene to give the corresponding diisocyanates and polyisocyanates of the diphenylmethane series, which may optionally be separated by distillation to give a mixture of diisocyanates and polyisocyanates containing from 50 to 80 wt. % of 4,4?-diphenylmethane diisocyanate, from 1 to 12 wt. % of 2,4?- and/or 2,2?-diphenylmethane diisocyanate taken together, and from 10 to 45 wt.Type: ApplicationFiled: June 7, 2006Publication date: November 6, 2008Inventors: Berthold Keggenhoff, Ralf Echterhoff, Ricardo-Burel Serra
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Publication number: 20080200721Abstract: The invention relates to a process for preparing isocyanates, which comprises the (1) preparation of a crude MDA mixture by reaction of aniline with formaldehyde, (2) separation of the crude MDA mixture into MMDA and PMDA, (3a) phosgenation of the PMDA separated off in step 2 in the liquid phase to form PMDI and (3b) phosgenation of the MMDA separated off in step 2 in the gas phase to form MMDI.Type: ApplicationFiled: March 22, 2006Publication date: August 21, 2008Applicant: BASF AktiengesellschaftInventors: Christian Muller, Eckhard Stroefer
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Publication number: 20080200722Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.Type: ApplicationFiled: July 31, 2006Publication date: August 21, 2008Applicant: BASF SEInventors: Andreas Wolfert, Carsten Knosche, Manfred Heilig, Eckhard Stroefer
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Publication number: 20080171894Abstract: The invention relates to a process for preparing isocyanates, which comprises the steps (1) preparation of a crude MDA mixture by reaction of aniline with formaldehyde, with the reaction conditions being selected so that the resulting crude MDA can be converted completely into the gas phase, (2) conversion of the crude MDA mixture from step (1) into the gas phase and (3) phosgenation of crude MDA in the gas phase to give MMDI and PMDI.Type: ApplicationFiled: March 22, 2006Publication date: July 17, 2008Applicant: BASF AktiengesellschaftInventors: Christian Muller, Eckhard Stroefer
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Publication number: 20080167490Abstract: Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling takes place in the cooling stretch in one stage in two or more cooling zones connected in series.Type: ApplicationFiled: December 11, 2007Publication date: July 10, 2008Inventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Herbert Stutz
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Publication number: 20080146834Abstract: An isocyanate is produced by reacting a primary amine with phosgene in the gas phase above the boiling point of the amine over an average contact time of 0.05 to 15 seconds under adiabatic conditions.Type: ApplicationFiled: December 11, 2007Publication date: June 19, 2008Inventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Herbert Stutz
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Publication number: 20080146835Abstract: The present invention relates to a process for the preparation of toluene-diisocyanate. In this process, toluenediamine is reacted with phosgene to give crude toluene-diisocyanate, the crude toluene-diisocyanate is purified by distillation, the distillation residue formed during the distillation is hydrolysed at temperatures of less than 230° C. under absolute pressures of less than 30 bar, and the toluenediamine formed by this process is subsequently recycled into the reaction of toluenediamine and phosgene.Type: ApplicationFiled: December 13, 2007Publication date: June 19, 2008Inventors: Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Friedhelm Steffens, Lothar Weismantel
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Patent number: 7368595Abstract: The invention relates to an improved process for the production of isocyanates by the reaction of an amine or a mixture of two or more amines with phosgene, the improvement involving the phosgene containing less than about 100 ppm of sulfur in elemental or bound form. The inventive process yields light-colored isocyanates that are suitable for the production of polyurethanes or their precursors (e.g. prepolymers) without the treatment processes heretofore required.Type: GrantFiled: January 10, 2007Date of Patent: May 6, 2008Assignee: Bayer MaterialScience AGInventors: Stefan Wershofen, Torsten Hagen, Christian Steffens, Jeffrey Bolton