公开(公告)号：DE2003126A1

公开(公告)日：1971-08-12

申请号：DE2003126

申请日：1970-01-24

Applicant: BASF AG

Inventor： SPERBER HEINRICH DR ,  HAAS HANS DR ,  HUSSY OSKAR DIPL-ING ,  SCHREIBER HANS DIPL-ING ,  SCHAEFER GERHARD DIPL-ING ,  LENZ HEINZ DIPL-ING

IPC: B01J8/02

Abstract: The catalyst bed is supported on a downward dished support, which avoids crack formation and channelling due to a temp. fluctuations. Underneath the bed, separated by a distance of less than a tenth of the gas velocity per second, the reaction products pass into the cooler. Prompt quenching improves the yield. Can be used for aldehyde mfe.

公开(公告)号：DE1618136A1

公开(公告)日：1971-03-11

申请号：DEB0092089

申请日：1967-04-15

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DR ,  SUTER HUBERT DR ,  MANN WALTER DIPL-ING ,  SCHAEFER GERHARD DIPL-ING

IPC: C07C51/573 ,  B01D3/00

Abstract: 1,180,117. Distillation columns; purification of phthalic anhydride. BADISCHE ANILIN-& SODA-FABRIK A.G. 19 May, 1967 [21 May, 1966; 15 April, 1967], No. 23398/67. Heading BIB. [Also in Division. C2] Phthalic anhydride is purified by distillation in a plant comprising two fractionating columns 1, 5 of the tray-type connected as shown to two evaporators 2, 8 each containing a vertically-disposed bundle of tubes, the arrangement being such that the distilland flows down as a thin film on the inside of the tubes. The material to be purified is introduced about half-way up column 1, which is maintained under reduced pressure. Vapours comprising about 37% of the feed, including all the low-boiling impurities, leave the head of column 1, and are condensed; and part of the condensate is refluxed to the column. Highboiling impurities are withdrawn from the system through line 9. Purified phthalic anhydride is obtained at the head of column 5.