公开(公告)号：MY116400A

公开(公告)日：2004-01-31

申请号：MYPI9700592

申请日：1997-02-18

Applicant: BASF AG

Inventor： DAMS ALBRECHT ,  ECK BERND ,  MACHHMMER OTTO ,  PROLL THEO

IPC: C07C57/04 ,  C07C57/07 ,  C07C51/43 ,  C07C57/05

Abstract: ACRYLIC ACID OR METHACRYLIC ACID IS PURIFIED BY (A) SUBJECTING A MIXTURE COMPRISING THE ACRYLIC ACID OR METHACRYLIC ACID TO A SHARPLY DEFINED SEPARATION PROCESS ESSENTIALLY IN THE ABSENCE OF AN ORGANIC SOLVENT, WITH THE COMPOSITION OF THE PHASE IN WHICH THE ACRYLIC ACID OR METHACRYLIC ACID ACCUMULATES REMAINING ESSENTIALLY CONSTANT WHEN THE COMPOSITION OF THE OTHER PHASES PARTICIPATING IN THE MASS TRANSFER CHANGES, THEN TAKING OFF THIS PHASE AND (A) SUBJECTING AT LEAST A PART OF THE REMAINING PHASE FROM STAGE (A) TO A LESS SHARPLY DEFINED SEPARATION PROCESS AND (B) FEEDING ONE OF THE PHASES FORMED IN STAGE (B) TO THE SHARPLY DEFINED SEPARATION PROCESS IN STAGE (A).IN ADDITION, THE INVENTION PROVIDES A PROCESS FOR PREPARING ACRYLIC ACID OR METHACRYLIC ACID WHICH INCLUDES THE ABOVEMENTIONED PURIFICATION PROCESS.

公开(公告)号：BR0103915A

公开(公告)日：2001-12-18

申请号：BR0103915

申请日：2001-01-10

Applicant: BASF AG

Inventor： ZEHNER PETER ,  MACHHMMER OTTO ,  HECHLER CLAUS ,  WECK ALEXANDRE ,  OLBERT ERHARD ,  STABEL UWE

IPC: F28F3/00 ,  B01J8/02 ,  B01J19/24 ,  B01J35/04 ,  C07C51/215 ,  C07C57/145 ,  C07D307/60

Abstract: A process for the preparation of maleic anhydride by heterogeneously catalyzed gas-phase oxidation in a reactor with feed for the reaction mixture at one end of the reactor and discharge of the product mixture at the opposite end of the reactor, and with devices for dissipating the heat of reaction which are arranged in the reactor interior and through which a heat-exchange medium flows and which are designed as heat-exchanger plates.