公开(公告)号：CZ2000885A3

公开(公告)日：2000-08-16

申请号：CZ2000885

申请日：1998-09-09

Applicant: BASF AG

Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BROELLOS KLAUS

IPC: C07C51/43 ,  C07C51/44 ,  C07C57/07

Abstract: A process for preparing acrylic acid or methacrylic acid comprises preparing a gaseous product mixture having essentially the composition of a reaction mixture of the catalytic gas phase oxidation of C3-/C4-alkanes, -alkenes, -alkanols and/or -alkanals and/or precursors thereof to form acrylic acid or methacrylic acid. The product is removed from the gaseous product mixture by a process comprising the following steps:(a) condensing said gaseous product mixture,(b) crystallizing acrylic acid or methacrylic acid from the solution obtained in step (a),(c) removing the resulting crystals from the mother liquor, and(d) recycling at least a portion of said mother liquor from step (c) into step (a).

公开(公告)号：DE19833049A1

公开(公告)日：2000-01-27

申请号：DE19833049

申请日：1998-07-22

Applicant: BASF AG

Inventor： ECK BERND ,  HEILEK JOERG ,  SCHLIEPHAKE VOLKER ,  PROLL THEO ,  BROELLOS KLAUS ,  MACHHAMMER OTTO ,  THIEL JOACHIM

IPC: C07C51/225 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

Abstract: In a process for production of acrylic acid by catalytic gas-phase oxidation of a 3C feedstock, the gaseous product is worked up by condensation followed by crystallization of acrylic acid by evaporation under vacuum, both the mother liquor from crystallization and the evaporated solution being at least partly recycled to the condensation stage. The production of acrylic acid comprises: (a) catalytic gas-phase oxidation of 3C alkanes, alkenes, alkanols and/or alkanals and/or precursors thereof to acrylic acid, (b) condensation of the gaseous product mixture, (c) crystallization of acrylic acid by partial evaporation of the solution obtained under vacuum, (d) separation of the crystals from the mother liquor, (e) recycling at least part of the mother liquor from (d) to stage (b) and (f) recycling at least part of the evaporated solution from (c) to stage (b).

公开(公告)号：CA1222258A

公开(公告)日：1987-05-26

申请号：CA455081

申请日：1984-05-24

Applicant: BASF AG

Inventor： LINDNER ALFRED ,  BROELLOS KLAUS ,  SANDROCK GERHARD ,  VOLKAMER KLAUS ,  HEFNER WERNER

IPC: C07C1/00 ,  C07C7/17 ,  C07C9/10 ,  C07C11/08 ,  C07C67/00

Abstract: The invention relates to a process for the separation of a C4-hydrocarbon mixture which essentially contains n-butenes and butanes. This process is characterized in that the mixture is reacted with a carboxylic acid in the presence of an acidic catalyst to form a butyl carboxylate; the reaction mixture obtained from the esterification zone is distilled to give, as the top product, a fraction containing the butanes, and, as the bottom product, a fraction containing the resulting butyl carboxylate; the butyl carboxylate is decomposed at elevated temperatures to give the carboxylic acid and n-butenes; and the mixture of n-butenes and carboxylic acid is then distilled, the n-butenes being obtained as the top product, and the carboxylic acid as the bottom product. This process permits to use apparatus that are less expensive than those required for the conventional extractive distillation method.

公开(公告)号：CA1182774A

公开(公告)日：1985-02-19

申请号：CA402343

申请日：1982-05-05

Applicant: BASF AG

Inventor： BROELLOS KLAUS ,  VOLKAMER KLAUS ,  LINDNER ALFRED

IPC: C10G7/08 ,  B01D3/40 ,  C07C1/00 ,  C07C7/08 ,  C07C11/12 ,  C07C67/00 ,  C10G21/28

Abstract: A process for obtaining a conjugated diolefin from a mixture of C4 or C5 hydrocarbons which contains this diolefin, by single-stage or multistage extractive distillation using a selective solvent and recycling the latter to the extractive distillation, after it has been obtained from the stripping zone downstream from each extractive distillation, a bleed stream of the recycled selective solvent being regenerated in a solvent purification stage in which the high-boiling or non-volatile impurities present in the solvent are separated off, and the regenerated solvent obtained from the solvent purification stage also being recycled, which process comprises regenerating the solvent in a thin-film evaporation zone.

公开(公告)号：CA1145290A

公开(公告)日：1983-04-26

申请号：CA347098

申请日：1980-03-06

Applicant: BASF AG

Inventor： VOLKAMER KLAUS ,  BROELLOS KLAUS ,  LINDNER ALFRED ,  WAGNER ULRICH ,  WEITZ HANS-MARTIN ,  SCHNEIDER KLAUS-JUERGEN

IPC: C07C1/00 ,  C07C7/08 ,  C07C11/12 ,  C07C67/00

Abstract: A process for isolating a conjugated diolefin from a C4- or C5-hydrocarbon mixture containing the diolefin, by single-stage or multi-stage extractive distillation using a selective solvent, wherein the selective solvent is a solvent mixture which comprises: a) from 50 to 98 percent by weight of an N-alkyl-substituted lower aliphatic acid amide or of an N-alkyl-substituted alicyclic acid amide having 5 ring members and b) from 2 to 50 percent by weight of a lower aliphatic carboxylic acid ester or carbonic acid ester boiling at from 30.degree.C to 200.degree.C.

公开(公告)号：CA1145288A

公开(公告)日：1983-04-26

申请号：CA347043

申请日：1980-03-05

Applicant: BASF AG

Inventor： VOLKAMER KLAUS ,  BROELLOS KLAUS ,  LINDNER ALFRED ,  WAGNER ULRICH ,  WEITZ HANS-MARTIN ,  SCHNEIDER KLAUS-JUERGEN

IPC: C07C1/00 ,  C07C7/08 ,  C07C11/12 ,  C07C67/00

Abstract: A process for isolating a conjugated diolefin from a C4- or C5-hydrocarbon mixture containing the diolefin, by single-stage or multi-stage extractive distillation using a selective solvent, wherein the selective solvent is a solvent mixture which comprises: a) from 75 to 98 per cent by weight of an N-alkylsubstituted lower aliphatic acid amide or of an N-alkylsubstituted alicyclic acid amide having 5 ring members, boiling at from 140 to 260.degree.C, or butyrolactone or methoxypropionitrile and b) from 2 to 25 per cent by weight of acetonitrile.