公开(公告)号：CA2075558C

公开(公告)日：2003-03-18

申请号：CA2075558

申请日：1992-08-07

Applicant: HOECHST AG

Inventor： ROSCHER GUNTER ,  KLEINER HANS-JERG ,  BERGER HARALD ,  SCHMIDT MANFRED ,  UHMANN RAINER ,  BOTTGER DIRK

IPC: C07F9/48 ,  C07F9/38 ,  C08G79/02 ,  C08G79/04

Abstract: Process for the preparation of pure propanephosphonic anhydride, which comprises distilling crude, impure propanephosphonic anhydride having an average degree of polymerization of 20 to 200 and containing less than 0.5% by weight of water by heating to 230 to 300.degree.C under a pressure of 0.1 to 100 mbar, pure propanephosphonic anhydride having an average decree of polymerization of 20 to 60 being obtained.

公开(公告)号：IE67293B1

公开(公告)日：1996-03-20

申请号：IE371789

申请日：1989-11-21

Applicant: HOECHST AG

Inventor： FLEMMING HANS-WOLFRAM ,  RUKWIED MANFRED ,  SCHMIDT MANFRED

IPC: C12P21/02 ,  C07K1/08 ,  C07K1/113 ,  C07K5/08 ,  C07K5/097

公开(公告)号：ES2075028T3

公开(公告)日：1995-10-01

申请号：ES89121277

申请日：1989-11-17

Applicant: HOECHST AG

Inventor： FLEMMING HANS-WOLFRAM DR ,  RUKWIED MANFRED DR ,  SCHMIDT MANFRED

IPC: C12P21/02 ,  C07K1/08 ,  C07K1/113 ,  C07K5/08 ,  C07K5/097

公开(公告)号：HU209824B

公开(公告)日：1994-11-28

申请号：HU634690

申请日：1990-10-05

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ ,  FREYER WALTER ,  SCHMIDT MANFRED

IPC: C07C51/58 ,  C07C53/48 ,  C07C51/25

Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced. In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene. In this way, side reactions are suppressed and the amount of by-products is reduced.

公开(公告)号：DE59007129D1

公开(公告)日：1994-10-20

申请号：DE59007129

申请日：1990-10-23

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ DR ,  SCHMIDT MANFRED ,  PETZ KARL DR

IPC: B01J27/053 ,  B01J27/125 ,  B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C67/58 ,  C07C69/02 ,  C07C69/63

Abstract: In the esterification of aliphatic C2-C6-carboxylic acids with aliphatic C1-C4-alcohols, the ester formed is distilled off azeotropically together with the water of reaction. After being separated from the water of reaction in a separation cooler, the ester phase is freed from entrained acid by scrubbing with water, and water and alcohol are then removed by distilling off a small portion of the ester. In this manner, no salt-containing waste water is formed. The ester is obtained in very good yield and free of acid and alcohol.

公开(公告)号：CA1316683C

公开(公告)日：1993-04-27

申请号：CA593191

申请日：1989-03-09

Applicant: HOECHST AG

Inventor： MILLER DENNIS ,  SCHMIDT MANFRED ,  HOLST ARNO ,  VON HALASZ SIGMAR-PETER

IPC: C09K8/584 ,  C09K23/02 ,  C09K23/42 ,  E21B43/22

Abstract: HOE 88/F 055 Aqueous surfactant mixtures, and the use thereof in oil recovery Surfactant mixtures made from 5 to 80% by weight of an ether sulfonate, 5 to 80% by weight of an alkyl or alkylphenol polyglycol ether and 10 to 80% by weight of an alkanesulfonate, petroleumsulfonate or alkylbenzenesulfonate. This combination of surfactants produces stable, aqueous solutions or dispersions which are highly suitable for surfactant flooding in tertiary oil recovery since these aqueous surfactant solutions or dispersions form microemulsions with the oil even at high salinities.

公开(公告)号：DE3937981A1

公开(公告)日：1991-05-16

申请号：DE3937981

申请日：1989-11-15

Applicant: HOECHST AG

Inventor： FREYER WALTER DR ,  MILTENBERGER KARLHEINZ DR ,  SCHMIDT MANFRED

IPC: B01J31/02 ,  C07B61/00 ,  C07C51/62 ,  C07C53/48

公开(公告)号：DE3935470A1

公开(公告)日：1991-05-02

申请号：DE3935470

申请日：1989-10-25

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ DR ,  SCHMIDT MANFRED ,  PETZ KARL DR

IPC: B01J27/053 ,  B01J27/125 ,  B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C67/58 ,  C07C69/02 ,  C07C69/63

Abstract: In the esterification of aliphatic C2-C6-carboxylic acids with aliphatic C1-C4-alcohols, the ester formed is distilled off azeotropically together with the water of reaction. After being separated from the water of reaction in a separation cooler, the ester phase is freed from entrained acid by scrubbing with water, and water and alcohol are then removed by distilling off a small portion of the ester. In this manner, no salt-containing waste water is formed. The ester is obtained in very good yield and free of acid and alcohol.

公开(公告)号：DK584489A

公开(公告)日：1990-05-23

申请号：DK584489

申请日：1989-11-21

Applicant: HOECHST AG

Inventor： FLEMMING HANS-WOLFRAM ,  RUKWIED MANFRED ,  SCHMIDT MANFRED

IPC: C12P21/02 ,  C07K1/08 ,  C07K1/113 ,  C07K5/08 ,  C07K5/097 ,  C07K1/06

公开(公告)号：NO891015L

公开(公告)日：1989-09-11

申请号：NO891015

申请日：1989-03-09

Applicant: HOECHST AG

Inventor： MILLER DENNIS ,  SCHMIDT MANFRED ,  HOLST ARNO ,  HALASZ SIGMAR-PETER VON

IPC: C09K8/584 ,  C09K23/02 ,  C09K23/42 ,  E21B43/22 ,  B01F17/12 ,  B01F17/42

Abstract: Surfactant mixtures made from 5 to 80% by weight of an ether sulfonate, 5 to 80% by weight of an alkyl or alkylphenol polyglycol ether and 10 to 80% by weight of an alkanesulfonate, petroleumsulfonate or alkylbenzenesulfonate. This combination of surfactants produces stable, aqueous solutions or dispersions which are highly suitable for surfactant flooding in tertiary oil recovery since these aqueous surfactant solutions or dispersions form microemulsions with the oil even at high salinities.