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公开(公告)号：AU8700391A
公开(公告)日：1992-05-07
申请号：AU8700391
申请日：1991-11-01
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ , GRADL REINHARD , JAGERS ERHARD , SEIDEL ANDREAS
Abstract: A continuous process for the simultaneous preparation of acetic acid and acetic anhydride from a starting mixture of methanol and methyl acetate and, if appropriate, dimethyl ether, by reaction with carbon monoxide under anhydrous conditions at temperatures from 150 to 250 DEG C and under increased pressure in a reaction zone using a dissolved catalyst system containing a nickel compound, methyl iodide as promoter, at least one co-promoter such as alkali metal iodide, quaternary phosphonium iodide or quaternary ammonium iodide, and a cocatalyst, is characterised in that the cocatalyst used is a rhodium or iridium compound in a molar ratio of nickel : cocatalyst of 1 : (0.005 to 0.1), a nickel concentration of 0.01 to 0.1, preferably 0.015 to 0.06 mol/l is established in the reaction zone, and is carried out under an increased pressure of 30 to 100 bar.
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公开(公告)号：CA2008226C
公开(公告)日：1996-09-03
申请号：CA2008226
申请日：1990-01-22
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ , LORK WINFRIED , SEIDEL ANDREAS , PRINZ PETER
IPC: B01J38/00 , B01J31/40 , C07B61/00 , C07C27/00 , C07C51/12 , C07C51/373 , C07C51/42 , C07C51/56 , C07C51/573 , C07C53/08 , C07C53/12 , C07C67/36 , C07C67/37 , C07C69/16 , C07F15/00 , B01J38/68
Abstract: In a process for removing the metallic corrosion products from a contaminated catalyst solution produced on carbonylation of methanol and/or methyl acetate and/or dimethyl ether and containing carbonyl complexes of rare metals from group VIII of the Periodic Table of the elements, quaternary organo-phosphorus compounds as organic promoters, metallic corrosion products and acetic acid, acetic anhydride, ethylidene diacetate and, in some cases, undistillable organic compounds, the catalyst solution is treated with water, the rare metal carbonyl complex and the undistillable organic compounds, if present, being precipitated, while the organic promoter and the metallic corrosion products remain in solution; the aqueous phase is separated from the precipitated rare metal carbonyl complex and the organic promoter is extracted from the aqueous phase using C4-C8-alkanols, the promoter is recovered by the evaporating extractant, the promoter is recombined with the precipitated rare metal carbonyl complex and with the undistillable organic compounds, if present, and the purified catalyst solution is recycled into the process after addition of acetic acid and/or acetic anhydride; finally, the aqueous phase with the metallic corrosion products is purged.
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公开(公告)号：CA2128548A1
公开(公告)日：1995-02-13
申请号：CA2128548
申请日：1994-07-21
Applicant: HOECHST AG
Inventor： SEIDEL ANDREAS , HAUSER ALFRED , PRINZ PETER
IPC: C07C51/44 , C07C51/487 , C07C53/08
Abstract: Process for the removal of aldehydes and acetals from industrially prepared acetic acid of the disclosure A process is specified for the removal of aldehydes and acetals from industrially prepared acetic acid, which comprises reacting the contaminated acetic acid in the presence of a Br?natedt acid and 0.05 to 1% by weight of water and, if required, of 3 to 10 equivalents, calculated on aldehyde and acetal, of a high-boiling polyhydric alcohol having the general structural member in which n is an integer from 0 to 3 and m is an integer greater than 3, at temperature of 50 to 118.degree.C for a period of 1 to 5 hours, and then isolating the pure acetic acid from the reaction product by fractional distillation.
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公开(公告)号：ZA9304375B
公开(公告)日：1994-01-13
申请号：ZA9304375
申请日：1993-06-18
Applicant: HOECHST AG
Inventor： SEIDEL ANDREAS , JAEGERS ERHARD , BYLSMA FRIEDHELM
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公开(公告)号：CA2090173A1
公开(公告)日：1993-09-13
申请号：CA2090173
申请日：1993-02-23
Applicant: HOECHST AG
Inventor： JAEGERS ERHARD , SEIDEL ANDREAS , POTTKAEMPER KAREN
Abstract: HOE 92/H 006 Process for the stabilization of ethanolic ethylmagnesium carbonate solutions In a process for the stabilization of a solution of ethylmagnesium carbonate in ethanol, which has been prepared by the reaction of a suspension of magnesium ethylate in ethanol with carbon dioxide, 0.2 to 1.0% by weight of water, based on the ethylmagnesium carbonate solution, is added to the solution or its starting materials.
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Patent Agency Ranking
公开(公告)号：ZA918701B
公开(公告)日：1992-08-26
申请号：ZA918701
申请日：1991-11-01
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ , HEINZ ERPENBACH , GRADL REINHARD , REINHARD GRADL , JAEGERS ERHARD , ERHARD JAEGERS , SEIDEL ANDREAS , ANDREAS SEIDEL
IPC: B01J31/02 , B01J31/18 , B01J31/30 , C07B61/00 , C07C51/12 , C07C51/56 , C07C53/08 , C07C53/12 , C07C
Abstract: A continuous process for the simultaneous preparation of acetic acid and acetic anhydride from a starting mixture of methanol and methyl acetate and, if appropriate, dimethyl ether, by reaction with carbon monoxide under anhydrous conditions at temperatures from 150 to 250 DEG C and under increased pressure in a reaction zone using a dissolved catalyst system containing a nickel compound, methyl iodide as promoter, at least one co-promoter such as alkali metal iodide, quaternary phosphonium iodide or quaternary ammonium iodide, and a cocatalyst, is characterised in that the cocatalyst used is a rhodium or iridium compound in a molar ratio of nickel : cocatalyst of 1 : (0.005 to 0.1), a nickel concentration of 0.01 to 0.1, preferably 0.015 to 0.06 mol/l is established in the reaction zone, and is carried out under an increased pressure of 30 to 100 bar.
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公开(公告)号：ZA9107509B
公开(公告)日：1992-06-24
申请号：ZA9107509
申请日：1991-09-20
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ , HEINZ ERPENBACH , GRADL REINHARD , REINHARD GRADL , JAEGERS ERHARD , ERHARD JAEGERS , SEIDEL ANDREAS , ANDREAS SEIDEL
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公开(公告)号：CA2050554A1
公开(公告)日：1992-03-22
申请号：CA2050554
申请日：1991-09-03
Applicant: HOECHST AG
Inventor： GRADL REINHARD , ERPENBACH HEINZ , WEFERLING NORBERT , JAGERS ERHARD , SEIDEL ANDREAS
Abstract: HOE 90/H 029 Process for inhibiting and destroying peroxides in dialkyl ethers of the disclosure: A process is indicated for inhibiting and destroying peroxides in dialkyl ethers having the general formula R1OR2 in which R1 and R2 are alkyl groups having 1 to 6 carbon atoms, which comprises adding, as inhibitor, a quaternary alkyl iodide of an element of the fifth main group of the Periodic Table of the Elements to the dialkyl ethers.
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公开(公告)号：CA2040240A1
公开(公告)日：1991-11-03
申请号：CA2040240
申请日：1991-04-11
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ , GRADL REINHARD , JAGERS ERHARD , SEIDEL ANDREAS , WEFERLING NORBERT
IPC: C07F9/54
Abstract: HOE 90/H 015 Process for the preparation of methanolic methyltri-n-alkylphosphonium iodide solution of the disclosure A process for the preparation of methanolic methyltrin-alkylphosphonium iodide solution having 3 to 8 carbon atoms in the carbon chain and prepared from tri-n-alkyl-phosphine and methyl iodide in a diluent is described, in which methanol is used as the diluent.
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公开(公告)号：SG54085A1
公开(公告)日：1998-11-16
申请号：SG1995001379
申请日：1994-07-09
Applicant: HOECHST AG
Inventor： SEIDEL ANDREAS , HAUSER ALFRED , PRINZ PETER
IPC: C07C51/44 , C07C51/487 , C07C53/08 , C07C51/42 , C08B37/02
Abstract: A process is given for removing aldehydes and acetals from technical-grade acetic acid, which is characterised in that the acetic acid with its impurities is allowed to react in the presence of a Brönstedt acid and of 0.05 to 1 per cent by weight of water and, if appropriate, 3 to 10 equivalents, based on aldehyde and acetal, of a higher-boiling polyol with the general structural unit in which n represents an integer from 0 to 3 and m represents an integer greater than 3, at temperatures from 50 to 118 DEG C over a period of 1 to 5 hours and thereupon the pure acetic acid is obtained from the reaction product by fractional distillation.
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