公开(公告)号：ZA200903388B

公开(公告)日：2010-07-28

申请号：ZA200903388

申请日：2009-05-18

Applicant: BASF SE

Inventor： HEILEK JOERG ,  DIETERLE MARTIN ,  DIEFENBACHER ARMIN ,  MUELLER-ENGEL KLAUS JOACHIM

IPC: C07C20100101

Abstract: Separating acrylic acid from a product gas from the gas-phase oxidation of a C 3 precursor on a heterogeneous catalyst comprises transferring acrylic acid and benzoic acid into a liquid phase P, stripping off low boilers to give a liquid phase P* with an acrylic acid content C of at least 80 wt.% and a benzoic acid content of at least 0.01% of C, and crystallizing acrylic acid from liquid phase P*.

公开(公告)号：AT458540T

公开(公告)日：2010-03-15

申请号：AT06830581

申请日：2006-12-13

Applicant: BASF SE

Inventor： DIEFENBACHER ARMIN ,  GOEBBEL HANS-GEORG ,  BITTERLICH STEFAN ,  VOSS HARTWIG ,  SCHULTZ HENNING ,  FORLIN ANNA ,  PATRASCU RENATE

IPC: B01D1/26 ,  B01D3/14

Abstract: The present invention relates to a process for separating at least one propylene glycol from a mixture (M) comprising water and said propylene glycol, said process comprising (I) evaporating the mixture in at least two evaporation and/or distillation stages at decreasing operating pressures of the evaporators and/or distillation columns obtaining mixture (M′) and mixture (M″); (II) separating the mixture (M′) obtained in (I) in at least one further distillation step, obtaining a mixture (M-I) comprising at least 70 wt.-% of water and a mixture (M-II) comprising less than 30 wt.-% of water.

公开(公告)号：DE502004007442D1

公开(公告)日：2008-08-07

申请号：DE502004007442

申请日：2004-04-07

Applicant: BASF SE

Inventor： MACHHAMMER OTTO ,  CRONE SVEN ,  BORGMEIER FRIEDER ,  MUELLER-ENGEL KLAUS JOACHIM ,  ADAMI CHRISTOPH ,  DIEFENBACHER ARMIN

IPC: C07C57/05 ,  C07C51/215

Abstract: Disclosed is a method for the heterogeneously catalyzed partial direct oxidation of propane and/or isobutane. According to said method, target product is separated from the product gas mixture obtained in the reaction stage in a reprocessing stage, the remaining product gas mixture is divided into two partial quantities having the same composition, one partial quantity is redirected into the reaction stage while the other partial quantity is discharged, and both the reaction stage and the reprocessing stage are operated at an increased pressure.

公开(公告)号：DE102007004960A1

公开(公告)日：2008-07-31

申请号：DE102007004960

申请日：2007-01-26

Applicant: BASF SE

Inventor： DIEFENBACHER ARMIN ,  HAMMON ULRICH ,  SCHLIEPHAKE VOLKER ,  SIEDER GEORG

IPC: C07C57/05 ,  C07C57/07 ,  C08F2/02 ,  C08F2/04 ,  C08F220/06

Abstract: In production of acrylic acid (I) by partial gas phase oxidation, where the product gas mixture (containing (I), steam and by-products) is selectively condensed in a column and part of a withdrawn acidic water stream (containing (I)) is recycled to the column, (I) is extracted with an organic solvent from another part of the acidic water and (I) is thermally separated from the extract before recycling, purifying and/or taking up in alkali. In the production of acrylic acid (I) by partial gas phase oxidation of 3C precursor(s) (II) with oxygen over a solid catalyst at elevated temperature, the product gas mixture containing (I), steam and by-products (III) (optionally after (in)direct cooling) is passed upwards through a selective condensation column with separators. Water and (III) are withdrawn at a first side outlet above the introduction site; acidic water containing (I) and (III) is withdrawn at a second, higher side outlet; a residual gas containing lower-boiling (III) is withdrawn at the head; and a liquid containing (I) and higher boiling (III) is obtained at the sump. Part of the acidic water is recycled to the column (optionally after cooling) and the crude (I) is purified by further thermal treatment. The novel features are that (I) is extracted with an organic solvent (IV) from another part of the acidic water; (I) is thermally separated from the obtained solution of (I) in (IV); and the obtained (I) is recycled to the column, or is further purified and/or taken up in aqueous metal hydroxide solution.

公开(公告)号：AT399150T

公开(公告)日：2008-07-15

申请号：AT04726111

申请日：2004-04-07

Applicant: BASF SE

Inventor： MACHHAMMER OTTO ,  CRONE SVEN ,  BORGMEIER FRIEDER ,  MUELLER-ENGEL KLAUS ,  ADAMI CHRISTOPH ,  DIEFENBACHER ARMIN

IPC: C07C57/05 ,  C07C51/215

Abstract: Disclosed is a method for the heterogeneously catalyzed partial direct oxidation of propane and/or isobutane. According to said method, target product is separated from the product gas mixture obtained in the reaction stage in a reprocessing stage, the remaining product gas mixture is divided into two partial quantities having the same composition, one partial quantity is redirected into the reaction stage while the other partial quantity is discharged, and both the reaction stage and the reprocessing stage are operated at an increased pressure.