Patents Assigned to Degussa-Huels
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Publication number: 20010021787Abstract: Cyanoacetamide is prepared without additional catalyst by esterification of crude cyanoacetic acid with a monohydric alcohol which forms an azeotrope with water and has 4 to 10 carbon atoms, reacting the resulting ester with ammonia in the presence of a basic catalyst to give cyanoacetamide, and work-up by a mechanical separating operation and a thermal treatment.Type: ApplicationFiled: February 27, 2001Publication date: September 13, 2001Applicant: DEGUSSA-HUELS AKTIENGESELLSCHAFTInventors: Manuela Imig, Manfred Kaufhold, Thomas Kalz
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Patent number: 6288256Abstract: An aqueous organopolysiloxane-containing composition comprising organopolysiloxanes of formula I: HO [Si(A)(CH3)z(OH)1−zO]a[Si(B)(R2)y(OH)1−yO]b[Si(C)(CH3)O]c[Si(D)(OH)O]dH.Type: GrantFiled: January 12, 1999Date of Patent: September 11, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Burkhard Standke, Roland Edelmann, Albert-Johannes Frings, Michael Horn, Peter Jenkner, Ralf Laven, Helmut Mack, Jaroslaw Monkiewicz
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Patent number: 6288264Abstract: Cyanoacetamide is prepared without additional catalyst by esterification of crude cyanoacetic acid with a monohydric alcohol which forms an azeotrope with water and has 4 to 10 carbon atoms, reacting the resulting ester with ammonia in the presence of a basic catalyst to give cyanoacetamide, and work-up by a mechanical separating operation and a thermal treatment.Type: GrantFiled: February 27, 2001Date of Patent: September 11, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Manuela Imig, Manfred Kaufhold, Thomas Kalz
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Patent number: 6284116Abstract: Bases and organic acids are simultaneously separated from aqueous solutions comprising bases and organic acids by electrochemically treating aqueous solutions containing these components, particularly the aqueous waste solution obtained from an aldolization reaction.Type: GrantFiled: October 29, 1999Date of Patent: September 4, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Klaus-Diether Wiese, Antje Jakob, Franz-Felix Kuppinger
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Patent number: 6284892Abstract: The present invention relates to a process for the production of salts of cyclic amidines of the general formula (I) The processes described hitherto as prior art enable salts of the compound (I) to be produced only at low yields. As a result of protecting &ohgr;-amino-&agr;-amino acids selectively at the &ohgr;-amino function, oxidative decarboxylation of the latter protected compounds by means of halogen derivatives, and subsequent cyclisation of the oxidatively decarboxylated substances with the addition of acid, according to the invention salts of the compound (I) are achieved in better yields.Type: GrantFiled: June 7, 2000Date of Patent: September 4, 2001Assignee: Degussa Huels AktiengesellschaftInventors: Dieter Most, Karlheinz Drauz
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Patent number: 6284703Abstract: A shaped, activated, fixed-bed Raney metal catalyst prepared by a method comprising preparing a mixture of powders comprising at least one catalyst alloy of (1) at least one catalytically active Raney process metal, a leachable alloy component and optionally a promoter, (2) at least one binder containing at least one pure Raney metal and (3) a moistening agent. Shaping, calcining and activating said catalyst and doping said catalyst with rhenium.Type: GrantFiled: August 5, 1999Date of Patent: September 4, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Daniel Ostgard, Konrad Moebus, Monika Berweiler, Barbara Bender, Gernot Stein
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Publication number: 20010018105Abstract: A multilayer plastic pipe having strong bonding between the layers has at least one layer I of a polyolefin molding composition comprising a polyolefin, at least one layer II of a polyester molding composition, and at least one layer III of an adhesion promoter containing reactive groups and located between layers I and II. The polyester molding composition of layer II comprises a polyester and one or more compounds selected from a compound having two or more carbodiimide groups, carboxylic anhydride groups, maleimide groups or oxazine groups.Type: ApplicationFiled: January 4, 2001Publication date: August 30, 2001Applicant: DEGUSSA-HUELS AKTIENGESELLSCHAFTInventors: Guido Schmitz, Georg Oenbrink, Walter Hellermann, Thomas Grosse-Puppendahl, Harald Haeger
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Publication number: 20010017065Abstract: Transition metals may be recovered from a salt-containing mixture containing at least one transition metal compound, salts, and organic compounds by separating from the salt-containing mixture a mixture of the transition metal compound and the salts. This mixture, together with any organic impurities, is introduced into a combustion zone, and the flue gas/salt mixture leaving the combustion zone is quenched with water. The combustion residue, containing the transition metal, is separated from the resulting quench solution, dried, and converted to fresh catalyst.Type: ApplicationFiled: February 21, 2001Publication date: August 30, 2001Applicant: DEGUSSA-HUELS AKTIENGESELLSCHAFTInventors: Frank Bauer, Uwe Prange, Christoph Theis
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Patent number: 6281288Abstract: A reinforced molding material having high tensile strength comprising: (a) from 0 to 98 parts by weight of one or more thermoplastics, (b) from 2 to 100 parts by weight of a substantially amorphous polyolefin which has been subjected to free radical grafting with a silane which has at least one olefinic double bond and one to three alkoxy groups bonded directly to the silicon, this grafted polyolefin having a melt viscosity at 190° C. In the range from 100 to 50,000 maps and the parts by weight of (a) and (b) sunning to 100, and (c) from 0.5 to 400 parts by weight of a reinforcing material. The molding material can be used, inter alia, for shaped articles, as hotmelt adhesives or for heavy-duty carpet backing materials.Type: GrantFiled: March 3, 1999Date of Patent: August 28, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Peter Bickert, Ralf Laven, Hans Guenther Wey
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Patent number: 6280593Abstract: The present invention relates to a process for separating organic acids from aqueous solutions by the use of electrochemical processes such as electrolysis and electrodialysis. These processes can be used, for example, to purify aqueous solutions produced in aldol condensation processes.Type: GrantFiled: October 29, 1999Date of Patent: August 28, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Klaus-Diether Wiese, Antje Jakob, Franz-Felix Kuppinger
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Patent number: 6270676Abstract: A process for the removal of ethers and/or PAH's from water, such as contaminated groundwater, is provided that proceeds by initially separating off solid constituents and then adsorbing ethers and polycyclic aromatic hydrocarbons to an adsorber resin, then, as needed, desorbing the adsorbed compounds with steam and regenerating the adsorber resin with an acid, to provide purification of highly polluted groundwater to such a substantial extent that the groundwater can be added to flowing surface waters without problem, and, if desired, used as cooling water or, after further biological purification, as drinking water.Type: GrantFiled: February 10, 1997Date of Patent: August 7, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Gerda Grund, John Kahsnitz
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Patent number: 6258915Abstract: Solid polyurethane hardeners (curing agents) having triazine groups, are prepared by reacting polyaddition compounds with a second compound having a >C═N— group. The polyaddition compounds are prepared by reacting a uretdione-functional polyisocyanate with a hydroxy-functional chain extender.Type: GrantFiled: November 1, 1999Date of Patent: July 10, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Emmanouil Spyrou, Stephan Kohlstruk, Holger Loesch
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Patent number: 6251989Abstract: An oligomerized polyorganosiloxane cocondensate which may be obtained, in part, by mixing an water-soluble amino-functional organosilane represented with at least one of the followoing: a fluoro-functional organosilane, an organosilane, and an organosilane. The cocondensate may be used, for example, in a method of treating surfaces.Type: GrantFiled: May 26, 1999Date of Patent: June 26, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Roland Edelmann, Albert-Johannes Frings, Michael Horn, Peter Jenkner, Eckhard Just, Manfred Kaussen, Ralf Laven, Helmut Lohmann, Helmut Mack, Jaroslaw Monkiewicz, Stephan Ramlow, Burkhard Standke, Tilman Taeger
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Patent number: 6251983Abstract: Inversion carbon blacks and a method for their manufacture are disclosed. The inversion carbon blacks have a lower rolling resistance with identical or improved wet skid behavior. The particle size distribution contains a smaller proportion of particles with large diameters. This leads to an improved abrasion behavior of rubber compounds which were prepared using these carbon blacks. The inversion carbon blacks can be manufactured in conventional carbon black reactors by controlling the combustion in the combustion chamber in such a manner that carbon black nuclei form, which are immediately brought into contact with the carbon black raw material. The carbon blacks present a lower proportion of larger particles if the additions of combustion air and carbon black raw material are increased in an appropriate manner.Type: GrantFiled: June 10, 1999Date of Patent: June 26, 2001Assignee: Degussa - Hüls AktiengesellschaftInventors: Conny Vogler, Karl Vogel, Werner Niedermeier, Burkhard Freund, Paul Messer
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Patent number: 6242599Abstract: A process for the preparation of guanine, by reacting 2,4-diamino-5-formylamino-6-hydroxypyrimidine (DAFHP) with formic acid, in the absence of formalize. The process may be conducted with the addition of water and at reflux temperature.Type: GrantFiled: August 27, 1999Date of Patent: June 5, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Christoph Theis, Stephan Bruhn
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Patent number: 6242628Abstract: Alkoxysilanes are prepared by a process, comprising: (i) reacting a chlorosilane with an alcohol in a water-free and solvent free phase with removal of the liberated hydrogen chloride; (ii) transferring the resultant product mixture into a liquid phase to be distilled and adding a metal alcoholate to the product mixture in the liquid at a temperature in the range from 10-60° C., and thoroughly mixing the neutralized product mixture, said alcoholate being employed in an equimolar amount or in a stoichiometric excess based on the amount of acidic chloride, and (iii) purifying the treated product mixture by distillation under reduced pressure, thereby preparing alkoxysilanes which are low in acidic chloride or essentially free of acidic chloride.Type: GrantFiled: November 8, 1999Date of Patent: June 5, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Frank Kropfgans, Hartwig Rauleder, Reinhold Schork
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Patent number: 6238525Abstract: A process for reducing the nitrogen oxides content of the exhaust gas from an internal combustion engine includes treating the exhaust gas in an electric gas discharge such that at least one of nitrogen dioxide or nitric acid are formed from nitrogen oxides in the exhaust gas; storing the nitrogen dioxides and/or the nitric acid in the form of nitrates on a nitrogen oxides storage material during phases when the engine operates with a greater than a stoichiometric air/fuel ratio (i.e., the storage phase); decomposing the nitrates to give nitrogen oxides during brief phases when the engine operates with a less than the stoichiometric air/fuel ratio (i.e., the desorption phase); and reducing the nitrogen oxides which are released from the storage material to nitrogen. The nitrogen oxides storage material may be located in an electric gas discharge zone, and the exhaust gas may be passed through the discharge and then over the storage material.Type: GrantFiled: April 27, 1999Date of Patent: May 29, 2001Assignee: Degussa-Hüls AktiengesellschaftInventors: Egbert Lox, Jürgen Gieshoff, Wolfgang Strehlau, Thomas Kreuzer
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Patent number: 6229036Abstract: Sulfanylsilanes of the formula X1X2X3Si—A—S—SiR1R2R3 are prepared by reacting mercaptosilanes of the formula X1X2X3Si—Alkyl—SH with chlorosilanes Cl—SiR1R2R3. They are used as coupling agents in rubber mixtures.Type: GrantFiled: September 29, 1999Date of Patent: May 8, 2001Assignee: Degussa-Hüls AktiengesellschaftInventors: Christoph Batz-Sohn, Hans-Detlef Luginsland
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Patent number: 6222056Abstract: The invention relates to a process for preparing vinylchlorosilanes by thermal non-catalyzed reaction of chlorosilanes with vinyl chloride at from 550 to 700° C., using a ring-gap reactor which includes rapidly cooling the hot reaction gases after they have flowed through the ring-gap space, by quenching them with a liquid.Type: GrantFiled: April 24, 2000Date of Patent: April 24, 2001Assignee: Degussa Huels AGInventors: Stefan Bade, Hartwig Rauleder, Uwe Schoen, Franz-Michael Bollenrath
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Patent number: 6214993Abstract: A process for preparing guanine, in which 2,4-diamino-5-formylamino-6-hydroxypyrimidine (DAFHP) in formic acid is reacted at superatmospheric pressure, optionally in the absence of formamide and/or in the presence of catalytic amounts of an additive which acts as a reducing agent.Type: GrantFiled: December 16, 1999Date of Patent: April 10, 2001Assignee: Degussa-Huels AktiengesellschaftInventors: Christoph Theis, Stefan Bruhn