公开(公告)号：US3868417A

公开(公告)日：1975-02-25

申请号：US39101273

申请日：1973-08-23

Applicant: BASF AG

Inventor： DUEMBGEN GERD ,  ENGELBACH HEINZ ,  FREY WALTER ,  KRABETZ RICHARD ,  LEBERT ULRICH ,  TRIESSEN FRITZ ,  WILLERSINN CARL-HEINZ

IPC: B01D53/14 ,  B01D53/72 ,  B01D53/77 ,  C07C51/00 ,  C07C51/25 ,  C07C51/48 ,  C07C57/07 ,  C07C67/00 ,  C07C57/04

CPC classification number: C07C51/252 ,  B01D53/1487 ,  B01D53/1493 ,  C07C51/48 ,  Y10S203/22 ,  C07C57/04

Abstract: On the separation of acrylic acid from reaction gases from the oxidation of propylene or acrolein a countercurrent absorption is carried out with at least 8 parts by weight of carboxylic ester per part by weight of acrylic acid contained in the reaction gas, the dissolved acetic acid and the dissolved water are substantially completely expelled from the resulting absorption solution at elevated temperature by means of inert gases, the loaded inert gases are passed to the countercurrent absorption for the recovery of the acrylic acid contained therein, and the acrylic acid is distilled off under reduced pressure from the carboxylic ester solution which is free from acetic acid and water.

Abstract translation: 在从丙烯或丙烯醛的氧化反应气体中分离丙烯酸的同时，对于反应气体中所含的每重量份丙烯酸中的至少8重量份的羧酸酯，溶解的乙酸和 溶解的水通过惰性气体在升高的温度下基本上完全从所得吸收溶液中排出，所加载的惰性气体被传递到逆流吸收以回收其中所含的丙烯酸，并且将丙烯酸在还原 来自不含乙酸和水的羧酸酯溶液的压力。

公开(公告)号：US3606732A

公开(公告)日：1971-09-21

申请号：US3606732D

申请日：1968-11-04

Applicant: BASF AG

Inventor： WOERNER ALFRED ,  DUEMBGEN GERD ,  SPERBER HEINRICH ,  HAAS HANS ,  GRABOWSKY OTTO

IPC: C07C47/058 ,  C07C45/00 ,  C07C45/38 ,  C07C45/78 ,  C07C67/00 ,  B01D53/16

CPC classification number: C07C45/38 ,  C07C45/783 ,  C07C47/04

Abstract: A PROCESS FOR THE ABSORPTION OF FORMALDEHYDE FROM GAS CONTAINING FORMALDEHYDE (OBTAINED IN THE DEHYDROGENATING OXIDATION OF METHANOL OVER SILVER CATALYSTS) AT ELEVATED TEMPERATURE IN A PLURALITY OF STAGES, WHEREIN THE GAS PASSES THROUGH AT LEAST THREE ABSORPTION STAGES AT TEMPERATURES OF FROM 60* TO ABOUT 90*C., PAARICULARLY FROM 70* TO 85*C., AND IS CONTACTED IN EACH OF THE STAGES FROM THE FIRST STAGE TO THE PENULTIMATE STAGE WITH AN AQUEOUS SOLUTION OF A UREA-FORMALDEHYDE PRECONDENSATE AND IN THE FINAL STAGE IS CONTACTED WITH AN AQUEOUS SOLUTION OF UREA.