公开(公告)号：DE2356049C3

公开(公告)日：1987-10-22

申请号：DE2356049

申请日：1973-11-09

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  RENAUER ERICH DIPL CHEM DR ,  AMMON HANS VON DIPL ING ,  SCHNEIDER CURT A DIPL CHEM DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07D307/36 ,  C07C51/573 ,  C07D307/60 ,  C07D307/89

Abstract: Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40 DEG to 150 DEG C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120 DEG to 180 DEG C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.

公开(公告)号：NL181656C

公开(公告)日：1987-10-01

申请号：NL7414427

申请日：1974-11-05

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  RENAUER ERICH DIPL CHEM DR ,  AMMON HANS VON DIPL ING ,  SCHNEIDER CURT A DIPL CHEM DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07D307/36 ,  C07C51/573 ,  C07D307/60 ,  C07D307/89

Abstract: Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40 DEG to 150 DEG C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120 DEG to 180 DEG C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.

公开(公告)号：DE3044518A1

公开(公告)日：1982-07-01

申请号：DE3044518

申请日：1980-11-26

Applicant: BASF AG

Inventor： STOCKBURGER DIETER DIPL ING DR ,  SCHULTZ WILHELM DIPL ING ,  SCHMIDT JOHANNES E DIPL CHEM D ,  WIRTH FRIEDRICH DIPL CHEM DR ,  HOFFMANN HERWIG DIPL CHEM DR ,  HOLZKNECHT BERNHARD DIPL ING D ,  WINTERMANTEL KLAUS DIPL ING DR

IPC: C07D307/89 ,  C07C51/265 ,  C07C51/31

公开(公告)号：FR2250753B1

公开(公告)日：1978-10-06

申请号：FR7436560

申请日：1974-11-04

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  RENAUER ERICH DIPL CHEM DR ,  AMMON HANS VON DIPL ING ,  SCHNEIDER CURT A DIPL CHEM DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07D307/36 ,  C07C51/573 ,  C07D307/60 ,  C07D307/89

Abstract: Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40 DEG to 150 DEG C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120 DEG to 180 DEG C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.

公开(公告)号：CA1032548A

公开(公告)日：1978-06-06

申请号：CA212195

申请日：1974-10-24

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  RENAUER ERICH DIPL CHEM DR ,  AMMON HANS VON DIPL ING ,  SCHNEIDER CURT A DIPL CHEM DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07D307/36 ,  C07C51/573 ,  C07D307/60 ,  C07D307/89

Abstract: Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40 DEG to 150 DEG C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120 DEG to 180 DEG C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.

公开(公告)号：ES431800A1

公开(公告)日：1977-01-16

申请号：ES431800

申请日：1974-11-08

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  RENAUER ERICH DIPL CHEM DR ,  AMMON HANS VON DIPL ING ,  SCHNEIDER CURT A DIPL CHEM DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07D307/36 ,  C07C51/573 ,  C07D307/60 ,  C07D307/89 ,  C07C

公开(公告)号：DE2525018A1

公开(公告)日：1976-12-23

申请号：DE2525018

申请日：1975-06-05

Applicant: BASF AG

Inventor： BLECHSCHMITT KURT ,  WIRTH FRIEDRICH DIPL CHEM DR ,  REUTER PETER DIPL CHEM DR

IPC: B01J23/22 ,  C07C51/265 ,  C07C51/31 ,  C07D307/89

公开(公告)号：DE2356049A1

公开(公告)日：1975-05-22

申请号：DE2356049

申请日：1973-11-09

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  RENAUER ERICH DIPL CHEM DR ,  AMMON HANS VON DIPL ING ,  SCHNEIDER CURT A DIPL CHEM DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07D307/36 ,  C07C51/573 ,  C07D307/60 ,  C07D307/89 ,  C07C57/14

Abstract: Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40 DEG to 150 DEG C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120 DEG to 180 DEG C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.