-
公开(公告)号：AT134638T
公开(公告)日：1996-03-15
申请号：AT92113468
申请日：1992-08-07
Applicant: HOECHST AG
Inventor： ROSCHER GUENTER DR , KLEINER HANS-JERG DR , BERGER HARALD DR , SCHMIDT MANFRED DR , UHMANN RAINER DR , BOETTGER DIRK DR
Abstract: Process for the purification of propanephosphonic anhydride, characterised in that crude propanephosphonic anhydride which contains impurities, has a mean degree of polymerisation of 20 to 200 and contains less than 0.5% by weight of water, is distilled by being heated to from 230 to 300 DEG C at a pressure of 0.1 to 100 mbar, giving pure propanephosphonic anhydride with a mean degree of polymerisation of 20 to 60.
-
公开(公告)号：DE59008297D1
公开(公告)日：1995-03-02
申请号：DE59008297
申请日：1990-10-13
Applicant: HOECHST AG
Inventor： ROSCHER GUENTER DR , SCHMIDT KARL-HEINZ DR , EICHLER KLAUS DR , HOERSTERMANN PETER DR , GRADL REINHARD DR , LANGNER HORST
IPC: B01D3/00 , B01D3/14 , C07B61/00 , C07C67/05 , B01J31/04 , C07C67/055 , C07C67/54 , C07C67/58 , C07C69/14 , C07C69/15
Abstract: The invention relates to a process for the isolation of vinyl acetate which involves not combining the bottom product of the recylced gas washings with the water-saturated vinyl acetate but rather introducing it to further multiple distillation columns from the gas mixture formed in the reaction of ethylene with acetic acid and oxygen over catalysts containing palladium or palladium compounds in the gas phase.
-
公开(公告)号：AT117286T
公开(公告)日：1995-02-15
申请号：AT90119650
申请日：1990-10-13
Applicant: HOECHST AG
Inventor： ROSCHER GUENTER DR , SCHMIDT KARL-HEINZ DR , EICHLER KLAUS DR , HOERSTERMANN PETER DR , GRADL REINHARD DR , LANGNER HORST
IPC: B01J31/04 , B01D3/00 , B01D3/14 , C07B61/00 , C07C67/05 , C07C67/055 , C07C67/54 , C07C67/58 , C07C69/14 , C07C69/15
Abstract: The invention relates to a process for the isolation of vinyl acetate which involves not combining the bottom product of the recylced gas washings with the water-saturated vinyl acetate but rather introducing it to further multiple distillation columns from the gas mixture formed in the reaction of ethylene with acetic acid and oxygen over catalysts containing palladium or palladium compounds in the gas phase.
-
公开(公告)号：BR9202324A
公开(公告)日：1993-01-19
申请号：BR9202324
申请日：1992-06-19
Applicant: HOECHST AG
Inventor： WIRTZ PETER DR , WOERNER KARL-FRED DR , WUNDER FRIEDRICH DR , EICHLER KLAUS DR , ROSCHER GUENTER DR
IPC: B01J23/44 , B01J23/58 , C07B61/00 , C07C67/055 , C07C69/15
Abstract: The invention relates to a process for the preparation of vinyl acetate in the gas phase from ethylene, acetic acid and oxygen, or oxygen-containing gases, on a catalyst which contains palladium and/or compounds thereof as well as alkali metal compounds on a support, the catalyst furthermore containing at least one barium compound, and gold, cadmium or their compounds being absent. The invention furthermore relates to the catalyst mentioned.
-
公开(公告)号：DE4024828A1
公开(公告)日：1992-02-06
申请号：DE4024828
申请日：1990-08-04
Applicant: HOECHST AG
Inventor： ROSCHER GUENTER DR
Abstract: The invention concerns a method of separating vinylphosphonic acid from product mixtures by extraction with alcohols and/or ketones with at least 5 carbon atoms. The method proposed enables high yields of high-purity vinylphosphonic acid to be obtained from extremely impure product mixtures.
-
Patent Agency Ranking
公开(公告)号：DE3408239A1
公开(公告)日：1985-09-26
申请号：DE3408239
申请日：1984-03-07
Applicant: HOECHST AG
Inventor： HEY HANSJOERG DR , SCHMIDT KARL-HEINZ DR , ROSCHER GUENTER DR , LANGNER HORST
Abstract: The invention relates to a process for the removal of high-boiling and polymer fractions from the acetic acid fraction which is obtained during the separation of the crude product from the reaction of acetic acid, ethylene and oxygen on a catalyst in the gas phase to give vinyl acetate. The acetic acid is distilled off from the acetic acid fraction down to a residual content of 30 to 95% by weight. At least sufficient water is then added to the residue such that an acetic acid-containing aqueous phase and a high-boiling and polymer-containing tar phase is formed. Instead of first distilling off the acetic acid and then adding water to the residue, the acetic acid can also be distilled off with addition of water or water vapour such that a high-boiling and polymer-containing bottom having a water content of 3 to 30% by weight remains.
-
公开(公告)号：DE58904994D1
公开(公告)日：1993-09-02
申请号：DE58904994
申请日：1989-02-02
Applicant: HOECHST AG
Inventor： WUNDER FRIEDRICH DR , ROSCHER GUENTER DR , EICHLER KLAUS DR
IPC: C07C67/055 , B01J23/52 , B01J23/60 , B01J23/66 , B01J31/04 , B01J35/02 , B01J35/10 , C07B61/00 , C07C69/15
Abstract: A process for the preparation of vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases on a catalyst which contains palladium and/or its compounds, and also, if desired, additionally gold and/or gold compounds, and also alkali metal compounds as activators and, if desired, additionally cadmium compounds, on a support. The support consists of cylindrical particles having curved end surfaces. The support material is aerogenic SiO2 or an aerogenic SiO2-Al2O3 mixture having a surface area of 50-250 m /g and a pore volume of 0.4-1.2 ml/g, which is formed to at least 50 % of pores having a diameter of 50-200 Angströms. … …
-
公开(公告)号：DE3862774D1
公开(公告)日：1991-06-20
申请号：DE3862774
申请日：1988-03-03
Applicant: HOECHST AG
Inventor： ROSCHER GUENTER DR , KLEINER HANS-JERG DR , IHL GABRIELE DR , LEIPE HERMANN
Abstract: Process for preparing vinylphosphonic acid dialkyl esters from 2-acetoxyethanephosphonic acid dialkyl esters using catalysts and at a temperature from 150 to 270 DEG C, characterised in that 2-acetoxyethanephosphonic acid dialkyl esters are cleaved at a partial pressure of the sum of the components of the reaction system of 1 to 50 mbar in contact with a liquid, catalytic medium and the resulting vinylphosphonic acid dialkyl esters and other volatile reaction products are removed in the form of vapour.
-
公开(公告)号：DE3939142A1
公开(公告)日：1991-05-29
申请号：DE3939142
申请日：1989-11-27
Applicant: HOECHST AG
Inventor： LEUPOLD ERNST INGO DR , ROSCHER GUENTER DR
IPC: B01J23/40 , C07B61/00 , C07F9/40 , C07F9/6571
Abstract: PCT No. PCT/EP90/01980 Sec. 371 Date May 22, 1992 Sec. 102(e) Date May 22, 1992 PCT Filed Nov. 20, 1990 PCT Pub. No. WO91/08210 PCT Pub. Date Jun. 13, 1991.A process for the preparation of diesters of carboxymethylphosphonic acid of the formula: (RO)2P(O)CH2CO2H, in which R is a straight-chain or branched alkyl radical having 1 to 20 carbon atoms, a cycloaliphatic radical having 5 to 8 carbon atoms, a phenyl or naphthyl radical which can be substituted, an aralkyl radical having 7 to 10 carbon atoms, or in which the (RO)2P group forms a ring having 2 to 5 carbon atoms which can be substituted, characterized in that dialkyl ester of 2-hydroxyethylphosphonic acid of the formula (RO)2P(O)CH2CH2OH, in which R has the abovementioned meaning, is reacted with oxygen in the presence of water and a catalyst which contains at least one metal selected from the platinum metals group.
-
公开(公告)号：DE3545196A1
公开(公告)日：1987-06-25
申请号：DE3545196
申请日：1985-12-20
Applicant: HOECHST AG
Inventor： PLESSEN HELMOLD VON DR , ROSCHER GUENTER DR
Abstract: The invention relates to a process for treating waste sulphuric acid containing tertiary aliphatic amines. In the process at least as much ammonia is added to the waste sulphuric acid as corresponds to the content of free and amine-bound sulphuric acid and the ammonium sulphate formed is subsequently separated from the amine.
-
-
-
-
-
-
-
-
-
Search Results
39
records
(took 0.023 seconds)
