公开(公告)号：BR6896157D0

公开(公告)日：1973-01-02

申请号：BR19615768

申请日：1968-01-11

Applicant: HOECHST AG

Inventor： PROBST O ,  SCHOLDERER J ,  ROSCHER G ,  GUNTHER K

IPC: C07C69/15 ,  C07C51/00 ,  C07C51/44 ,  C07C51/46 ,  C07C53/08 ,  C07C67/00

Abstract: 1,208,167. Recovery of vinyl esters. FARBWERKE HOECHST A.G. 12 Jan., 1968 [12 Jan., 1967], No. 1815/68. Heading C2C. Vinyl esters and carboxylic acids are continuously recovered from crude mixtures originating from the reaction of carboxylic acids with ethylene and oxygen, which mixture contains the ester, unreacted acid and water, by distilling the mixture in a first distilling column, if desired in the presence of a further substance which forms an azeotrope with water, and separating the azeotrope and the by-products having a lower boiling point than the vinyl ester at the head of the column, withdrawing from the sump of the column a practically anhydrous mixture, distilling said mixture in a second distilling column, withdrawing from the head of the second column the vinyl ester, from one or more concentrating zones between the head and the sump at least a major part of the by-products having a higher boiling point than the vinyl ester, and below the lowest concentrating zone or from the sump the carboxylic acid and the rest of the by-products. It is preferred to use the vinyl ester contained in the crude mixture as the substance forming an azeotrope with water. After separation of the vinyl ester from the azeotropic mixture obtained at the head of the first distilling column, the ester is recycled into the column. Examples describe the process applied to a mixture containing acetic acid, vinyl acetate, water, ethyl acetate and acetaldehyde and one containing isobutyric acid, vinyl isobutyrate, water, ethyl isobutyrate and acetaldehyde.

公开(公告)号：SE341846B

公开(公告)日：1972-01-17

申请号：SE241868

申请日：1968-02-23

Applicant: HOECHST AG

Inventor： ROSCHER G ,  GUENTHER K ,  PROBST O ,  SCHOLDERER J

IPC: C07C20060101 ,  C07C69/14

公开(公告)号：SE318268B

公开(公告)日：1969-12-08

申请号：SE26268

申请日：1968-01-09

Applicant: HOECHST AG

Inventor： ROSCHER G ,  GUENTHER K ,  SCHOLDERER J ,  PROBST O

IPC: C07C51/00 ,  C07C69/15 ,  C07C51/44 ,  C07C51/46 ,  C07C53/08 ,  C07C67/00 ,  C07C33/02

Abstract: 1,208,167. Recovery of vinyl esters. FARBWERKE HOECHST A.G. 12 Jan., 1968 [12 Jan., 1967], No. 1815/68. Heading C2C. Vinyl esters and carboxylic acids are continuously recovered from crude mixtures originating from the reaction of carboxylic acids with ethylene and oxygen, which mixture contains the ester, unreacted acid and water, by distilling the mixture in a first distilling column, if desired in the presence of a further substance which forms an azeotrope with water, and separating the azeotrope and the by-products having a lower boiling point than the vinyl ester at the head of the column, withdrawing from the sump of the column a practically anhydrous mixture, distilling said mixture in a second distilling column, withdrawing from the head of the second column the vinyl ester, from one or more concentrating zones between the head and the sump at least a major part of the by-products having a higher boiling point than the vinyl ester, and below the lowest concentrating zone or from the sump the carboxylic acid and the rest of the by-products. It is preferred to use the vinyl ester contained in the crude mixture as the substance forming an azeotrope with water. After separation of the vinyl ester from the azeotropic mixture obtained at the head of the first distilling column, the ester is recycled into the column. Examples describe the process applied to a mixture containing acetic acid, vinyl acetate, water, ethyl acetate and acetaldehyde and one containing isobutyric acid, vinyl isobutyrate, water, ethyl isobutyrate and acetaldehyde.

公开(公告)号：SE307348B

公开(公告)日：1969-01-07

申请号：SE2460

申请日：1960-01-04

Applicant: HOECHST AG

Inventor： ORTH A ,  MUNDLOS E ,  OEHME H ,  PROBST O ,  FERNHOLZ H

IPC: C07C51/00 ,  C07C51/09 ,  C07C57/10