Patents Assigned to Celanese GmbH
  • Patent number: 7319118
    Abstract: The present invention relates to the use of aqueous copolymer poly(vinyl ester) dispersions which comprise cellulose ethers in an amount up to a maximum of 0.45% by weight in food-coating compositions, and also food-coating compositions which comprise these aqueous copolymer poly(vinyl ester) dispersions, and their use in the coating of food, especially in the production of hard cheese.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: January 15, 2008
    Assignee: Celanese GmbH
    Inventors: Bernd Papenfuhs, Holger Schimanke
  • Publication number: 20030149267
    Abstract: Bidentate phosphine ligands of the formula 1
    Type: Application
    Filed: November 12, 2002
    Publication date: August 7, 2003
    Applicant: Celanese GmbH
    Inventors: Holger Geissler, Petrus W.N.M. Van Leeuwen, Paul C.J. Kamer, Lars A. Van der Veen
  • Patent number: 6566521
    Abstract: Bidentate phosphine ligands of the formula wherein the substituents are as defined in the specification and a process for preparing linear aldehydes by hydroformylating internal olefins using such phosphine ligands.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: May 20, 2003
    Assignee: Celanese GmbH
    Inventors: Holger Geissler, Petrus W. N. M. van Leeuwen, Paul C. J. Kamer, Lars A. van der Veen
  • Patent number: 6342605
    Abstract: Bidentate phosphine ligands of the formula wherein the substituents are as defined in the specification and a process for preparing linear aldehydes by hydroformylating internal olefins using such phosphine ligands.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: January 29, 2002
    Assignee: Celanese GmbH
    Inventors: Holger Geissler, Petrus W. N. M. van Leeuwen, Paul C. J. Kamer, Lars A. van der Veen
  • Patent number: 6310235
    Abstract: The invention relates to an improved method for producing ester plasticizers by reacting di- or polycarboxylic acids or their anhydrides with alcohols in the presence of metal catalysts.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: October 30, 2001
    Assignee: Celanese GmbH
    Inventor: Wilhelm Gick
  • Patent number: 6300517
    Abstract: A description is given of new chiral phosphine ligands containing amino acid groups and having the formula I where R1 is hydrogen, a C1-C7-alkyl radical, a C6-C10-aryl radical or a monovalent metal, preferably sodium or potassium, R2 is hydrogen or a C1-C7-alkyl radical, R3 is hydrogen or an —NR5R6 radical, where R5 and R6 are identical or different and are hydrogen or C1-C7-alkyl or C6-C10-aryl radicals, m is 0 or 1, with the exception of the compounds in which R5 and R6 are hydrogen and at the same time R2 is hydrogen, R4 is phenyl and R1 is methyl or benzyl and a process for their preparation. These phosphine ligands are suitable as constituents of metal complexes which can be used as catalysts for reactions to form C—C, C—H, C—N, C—Si or C═O bonds.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: October 9, 2001
    Assignee: Celanese GmbH
    Inventors: Othmar Stelzer, Michael Tepper
  • Patent number: 6288288
    Abstract: A process for preparing saturated alcohols comprising effecting an aldol condensation of alkyl methyl ketones of 6 to 8 carbon atoms which are branched at the &bgr;-carbon atom with aldehydes of 4 to 15 carbon atoms which are branched at the &agr;-carbon atom to form &agr;,&bgr;-unsaturated ketones and subsequent hydrogenation of the &agr;,&bgr;-unsaturated ketones to obtain alcohols, wherein the aldol condensation is carried out at a temperature of 60 to 130° C. in the presence of a 30-55% strength aqueous solution of an alkali metal hydroxide resulting in very low by-product formation.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: September 11, 2001
    Assignee: Celanese GmbH
    Inventor: Helmut Springer
  • Patent number: 6274774
    Abstract: The invention concerns a process for preparing aldehydes by reacting with hydrogen and carbon monoxide at a temperature of between 20 and 170° C. and a pressure of between 1 and 300 bar an olefinically unsaturated C6-C16 compound in the presence aqueous phase containing rhodium and sulphonated triarylphosphines as catalyst and between 10 and 70 wt % of a compound of formula (1), R(OCH2CH2)nOR1, R standing for hydrogen, a straight-chain or branched C1-C4 alkyl group or a C1-C4 hydroxyalkyl group, R1 standing for hydrogen or a methyl group, and n standing for an integer from 3 to 50.
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: August 14, 2001
    Assignee: Celanese GmbH
    Inventors: Sandra Bogdanovic, Carl-Dieter Frohning, Helmut Bahrmann
  • Patent number: 6268522
    Abstract: The invention relates to a process for producing supported shell catalysts comprising noble metals by UV photoreduction of noble metal salt precursors fixed to a support. For this purpose, the shaped supported body is impregnated with suitable noble metal salts which are then reduced to the metals in a zone close to the surface by means of UV radiation, preferably in the absence of a chemical reducing agent. The metal salts in the interior of the pellets which have not been irradiated and therefore have not been reduced are extracted using a solvent. The noble metal shell catalysts produced in this way can be used for many heterogeneously catalyzed reactions such as hydrogenations and oxidations. According to the invention, Pd/Au shell catalysts on porous ceramic supports, e.g. SiO2 shaped bodies, produced by this process can be used in the synthesis of vinyl acetate.
    Type: Grant
    Filed: June 3, 1998
    Date of Patent: July 31, 2001
    Assignee: Celanese GmbH
    Inventors: Alfred Hagemeyer, Uwe Dingerdissen, Klaus Kühlein, Johannes Heitz, Dieter Bäuerle
  • Patent number: 6228226
    Abstract: A process for working up crude, liquid vinyl acetate feed containing acetic acid, water and ethyl acetate and optionally smaller amounts of other impurities by distillation, wherein there is introduced into the distillation column, above the feed point of the crude, liquid vinyl acetate, 0.1 to 5% by weight of water, based on the crude, liquid vinyl acetate feed, and 0.1 to 60% by weight of acetic acid, based on the crude, liquid vinyl acetate feed.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: May 8, 2001
    Assignee: Celanese GmbH
    Inventors: Stefan Hess, Michael Mark, Melchior A. Meilchen, Johann Stamm, Thomas Vernaleken, Martin Wagner
  • Patent number: 6225504
    Abstract: A process for the preparation of the formula Ar13−xP[(Ar2(OZ)y]x  I wherein Ar1 and Ar2 are individually aromatic of 6 to 20 carbon atoms or heteroaromatic of 4 to 9 carbon atoms, each unsubstituted or substituted with at least one member of the group consisting of halogen, carboxyl, —OH, alkyl of 1 to 6 carbon atoms, phenyl and naphthyl, Ar1 has one valence and R2 has y+1 valences, x is an integer of 1, 2 or 3, y is 1 or 2, Z is carbohydrate with a glycosidic bond comprising reacting a hydrocarbon halide of the formula Z′—X  II when Z′ has the definition of Z with —OH protected and X is chlorine, bromine or fluorine with a phosphane of the formula Ar13−xP[(Ar2 (OH)y]x  III in a multi-phase reaction medium in the presence of a base and a phase transfer catalyst to form a phosphane of the formula Ar13−xP[(Ar2(OZ1)y]x  IV and removal of the protective groups to form a compound of Fo
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: May 1, 2001
    Assignee: Celanese GmbH
    Inventors: Sandra Bogdanovic, Matthias Beller, Alexander Zapf, Jurgen Krauter
  • Patent number: 6211414
    Abstract: The invention concerns a process for preparing aldehydes by reacting with hydrogen and carbon monoxide at a temperature of between 20 and 170° C. and a pressure of between 1 and 300 bar an olefinically unsaturated C3-C5 compound in the presence of an aqueous phase containing rhodium and sulphonated triarylphosphines as catalyst and between 1 and 35 wt % of a compound of formula (1), R(OCH2CH2)nOR1, R standing for hydrogen, a straight-chain or branched C1-C4 alkyl group or a C1-C4 hydroxyalkyl group, R1 standing for hydrogen or a methyl group, and n standing for an integer from 3 to 50.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 3, 2001
    Assignee: Celanese GmbH
    Inventors: Sandra Bogdanovic, Helmut Bahrmann, Carl-Dieter Frohning, Ernst Wiebus
  • Patent number: 6191063
    Abstract: A catalyst comprising rhodium and a compound of the formula (I) in which m is a number from 1 to 1000; x is a number from 0 to 4; W is a group of the formulae —CH2—CH2—, —CH(CH3)CH2—or —CH2CH(CH3)—; R is hydrogen, a straight-chain or branched C1-C5— alkyl radical; or a group of the formulae where a, b, c, d and e independently of one another are a number from 0 to 1000, at least one of the numbers a, b, c, d and e being greater than 0; R5, R6, R7, R8 and R9 are identical or different and are hydrogen, C1-C5-alkyl or a group of the formula R1 and R2 are identical or different and are a straight-chain, branched or cyclic C1-C30-alkyl radical or C6-10-aryl radical, which is unsubstituted or substituted by from one to five C1-C3-alkyl radicals, and L is C1-C5-alkyl, C1-C5-alkoxy, NO2, NR3R4, where R3 and R4 independently of one another are hydrogen or C1-C4-alkyl, or L is Cl or OH, for hydroformylation re
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: February 20, 2001
    Assignee: Celanese GmbH
    Inventors: Sandra Bogdanovic, Carl-Dieter Frohning, Helmut Bahrmann, Matthias Beller, Steffen Haber, Hans-Jerg Kleiner
  • Patent number: 6187953
    Abstract: Guanidinium phosphanes of Formula I wherein the substituents are defined as in the specification which are useful catalyst ligands for the carbon-carbon linkage reactions of the hect reaction.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: February 13, 2001
    Assignee: Celanese GmbH
    Inventors: Othmar Stelzer, Franz Peter Schmidtchen, Antonella Hessler, Michael Tepper, Harald Dibowski, Michael Riedel, Helmut Bahrmann
  • Patent number: 6150298
    Abstract: Process for the telomerization of dienesThe present invention relates to a process for the telomerization of dienes, according to which the diene is reacted with a compound containing an active hydrogen atom in the presence of a palladium compound, a water-soluble phosphine ligand and a base, the water-soluble ligand being a bidentate ligand having the following formula I ##STR1## in which R is identical or different and is phenyl, C.sub.1 -C.sub.12 -alkyl or C.sub.3 -C.sub.10 -cycloalkyl, which may be unsubstituted or substituted by one or more radicals R',R' is identical or different and is SO.sub.3.sup.- M.sup.+, --NMe.sub.3.sup.+ or --COO.sup.- M.sup.+,n is an integer from 1 to 6, in each case based on a naphthyl backbone, andM is H, Na, K, Cs or R".sub.4 N.sup.+ where R" is identical or different and is H, C.sub.1 -C.sub.12 -alkyl or C.sub.1 -C.sub.10 -cycloalkyl.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: November 21, 2000
    Assignee: Celanese GmbH
    Inventors: Ahmed Tafesh, Matthias Beller, Jochen Krause
  • Patent number: 6140544
    Abstract: A process for oxidizing a reaction gas in the presence of a catalyst solution comprisinga) oxidizing the reaction gas in a reactor in the presence of the catalyst solution, a reaction mixture being formed comprising droplets of the catalyst solution,b) passing the reaction gas into a first separator wherein the droplets of the catalyst solution are removed from the reaction mixture,c) passing the remaining reaction mixture from the first separator into a scrubbing apparatus wherein the oxidation product is removed from the reaction mixture, andd) passing the reaction mixture from the first separator through a second separator downstream of the first separator and upstream of a scrubbing apparatus wherein residual catalyst solution from the reaction mixture is removed.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: October 31, 2000
    Assignee: Celanese GmbH
    Inventors: Bernd Rinne, Erhard Franken-Stellamans
  • Patent number: 6139747
    Abstract: A process for cleaning up the wastewaters which originate from the preparation of alcohols. The alcohol preparation includes an aldolization reaction followed by hydrogenation and then alcohol distillation. The resulting wastewaters include 3 wastewater fractions from respective steps in the alcohol preparation. The process for cleaning up these wastewaters include the steps of (a) combining two of the three fractions and adjusting the pH of the combination, (b) bringing at least one of the fractions into contact with a coalescing filter, and (c) extracting a mixture of all three fractions.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: October 31, 2000
    Assignee: Celanese GmbH
    Inventors: Mariola Rotzheim, Wolfgang Zgorzelski
  • Patent number: 6137013
    Abstract: A method of stabilizing aliphatic C.sub.3 -C.sub.14 -aldehydes against polymerization and autocondensation by the addition of alkaline substances to the aldehydes wherein the alkaline substances used are alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal carbonates, alkaline earth metal carbonates or alkali metal carboxylates which are added to the aldehyde to be stabilized in amounts of 0.05-20 ppm, based on the aldehyde.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: October 24, 2000
    Assignee: Celanese GmbH
    Inventors: Michael Riedel, Wolfgang Zgorzelski, Michael Messerschmidt, Klaus Bergrath
  • Patent number: 6114272
    Abstract: A catalyst for preparing aldehydes by hydroformylation of olefins or olefinically unsaturated compounds comprising at least one rhodium compound and a non-aqueous ionic ligand liquid of the formula (Q.sup.+).sub.a A.sup.a-, where Q.sup.+ is a singly charged quaternary ammonium and/or phosphonium cation or the equivalent of a multiply charged ammonium and/or phosphonium cation and A.sup.a- is a sulfonated triarylphosphine.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: September 5, 2000
    Assignee: Celanese GmbH
    Inventor: Helmut Bahrmann
  • Patent number: 6114571
    Abstract: A catalyst for preparing vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases with, at the same time, low-high boiler formation which catalyst comprises palladium and/or its compounds, gold and/or its compounds, moron or boron compounds and alkali metal compounds on a particular support.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: September 5, 2000
    Assignee: Celanese GmbH
    Inventors: Roland Abel, Ioan Nicolau, Erich Hopf, Rainer Kiemel