公开(公告)号：DE3422575A1

公开(公告)日：1985-12-19

申请号：DE3422575

申请日：1984-06-18

Applicant: HOECHST AG

Inventor： ROSCHER GUENTHER DR ,  SCHMIDT KARL-HEINZ DR ,  HEY HANSJOERG DR ,  LANGNER HORST DR ,  ANDEREYA DI ERWIN

IPC: B01D3/00 ,  C07C51/44 ,  C07C67/055 ,  C07C67/48 ,  C07C67/54 ,  C07C69/15

Abstract: The invention relates to a process for the isolation of vinyl acetate from a gas mixture containing vinyl acetate, ethyl acetate, water and carbon dioxide formed in the reaction of ethylene with acetic acid and oxygen in the gas phase over catalysts containing palladium or palladium compounds. The gas mixture leaving the reaction zone is passed into a distillation column and the gas mixture leaving the top thereof is cooled. The gas which is not condensed during the cooling is washed with acetic acid in a washing column, an acetic acid solution containing vinyl acetate being obtained. The bottom product from the distillation column is passed to a second distillation column and a side stream containing ethyl acetate is removed from an enrichment zone above the bottom thereof, all or some of the bottom product from the second distillation column, which product chiefly consists of acetic acid, being used for the wash in the washing column. The top vapor of the second distillation column is cooled. A portion of the organic phase of the condensate thereby formed is passed, together with the acetic acid solution obtained as the bottom product in the washing column, into a third distillation column, which may have an intermediate tray. The bottom product of the third distillation column is passed into a fourth distillation column. Pure vinyl acetate is removed at the top of the fourth distillation column.

公开(公告)号：DE3707149A1

公开(公告)日：1988-09-15

申请号：DE3707149

申请日：1987-03-06

Applicant: HOECHST AG

Inventor： ROSCHER GUENTHER DR ,  KLEINER HANS-JERG DR ,  IHL GABRIELE DR ,  LEIPE HERMANN

IPC: C07B61/00 ,  C07F9/40

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：DE3919524A1

公开(公告)日：1990-12-20

申请号：DE3919524

申请日：1989-06-15

Applicant: HOECHST AG

Inventor： WUNDER FRIEDRICH DR ,  WIRTZ PETER DR ,  EICHLER KLAUS DR ,  ROSCHER GUENTHER DR

IPC: C07C67/05 ,  B01J23/58 ,  B01J23/60 ,  B01J29/70 ,  B01J31/04 ,  B01J35/10 ,  C07B61/00 ,  C07C67/055 ,  C07C69/15

公开(公告)号：DE4416018A1

公开(公告)日：1995-11-09

申请号：DE4416018

申请日：1994-05-06

Applicant: HOECHST AG

Inventor： KLEINER HANS-JERG DR ,  ROSCHER GUENTHER DR

IPC: B01J27/14 ,  B01J27/16 ,  B01J31/02 ,  C07B61/00 ,  C07F9/38 ,  C07F9/50 ,  C07C233/00 ,  C07C211/62 ,  C07F9/54 ,  C07C211/00

Abstract: The prodn. of vinyl-phosphonic acids of formula (I) comprises heating 2-chloro-ethyl-phosphonic acids (II), opt. in soln. and with or without catalyst, at 180-350 degrees C under atmos. or reduced pressure, with cleavage of HCl and opt. water, opt. followed by hydrolysis, where m = 1-20; n = an integer ≤ m.