公开(公告)号：JPS5077315A

公开(公告)日：1975-06-24

申请号：JP12762674

申请日：1974-11-07

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

公开(公告)号：JPS6041072B2

公开(公告)日：1985-09-13

申请号：JP12762674

申请日：1974-11-07

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

公开(公告)号：FR2250753A1

公开(公告)日：1975-06-06

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 The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.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：BE821870A

公开(公告)日：1975-05-05

申请号：BE150224

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 ,  C07C

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 The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.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：AT342018B

公开(公告)日：1978-03-10

申请号：AT897374

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

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：DE2309657A1

公开(公告)日：1974-09-12

申请号：DE2309657

申请日：1973-02-27

Applicant: BASF AG

Inventor： WIRTH FRIEDRICH DIPL CHEM DR ,  ZIEGER ALBERT DR ,  SUTER HUBERT DIPL CHEM DR

IPC: C07C57/05 ,  A47J37/06 ,  B01J23/00 ,  B01J23/22 ,  C07B61/00 ,  C07C51/00 ,  C07C51/21 ,  C07C51/25 ,  C07C51/265 ,  C07C51/31 ,  C07C57/145 ,  C07C67/00 ,  C07D307/60 ,  C07D307/89 ,  C07C51/20 ,  C07C57/14 ,  C07C63/18

公开(公告)号：DE2356049B2

公开(公告)日：1976-12-23

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：NL7414427A

公开(公告)日：1975-05-13

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：IT1025465B

公开(公告)日：1978-08-10

申请号：IT2915674

申请日：1974-11-06

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

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：GB1478525A

公开(公告)日：1977-07-06

申请号：GB4837974

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

Abstract: 1478525 Maleic anhydride recovery BASF AG 8 Nov 1974 [9 Nov 1973] 48379/74 Heading C2C Maleic-anhydride present in an effluent containing up to 40 wt. per cent maleic anhydride obtained by scrubbing, with water, the off-gas from the production of phthalic anhydride by catalytic-oxidation of xylene, with air, is recovered by evaporating the effluent solution, in one or more stages, at 40-150‹ C. under 50- 760 mm. Hg to a water content of less than 10 wt. per cent, heating the concentrate to 120- 180‹ C. under 100-600 mm. Hg in a thin-film or falling film evaporator, cooling the resulting maleic anhydride vapours to 110-140‹ C. and distilling the condensed maleic anhydride in such a manner that pure maleic anhydride is removed laterally and the volatiles are removed overhead, all the aqueous condensate obtained being returned to the off-gas scrubber.