公开(公告)号：CZ20010271A3

公开(公告)日：2001-06-13

申请号：CZ20010271

申请日：1999-07-21

Applicant: BASF AG

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

IPC: C07C51/43 ,  C07C57/07

公开(公告)号：BR9912344A

公开(公告)日：2001-04-17

申请号：BR9912344

申请日：1999-07-21

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: A process for the preparation of acrylic acid by:(a) preparation of a gaseous product mixture which essentially has the composition of a reaction mixture of catalytic gas-phase oxidation of C3-alkanes, C3-alkenes, C3-alkanols and/or C3-alkanals and/or intermediates thereof to acrylic acid, which comprises(b) condensation of the gaseous product mixture,(c) crystallization of the acrylic acid from the solution obtained in stage (b), with partial evaporation of the solution under reduced pressure,(d) isolation of the resulting crystals from the mother liquor,(e) recycling of at least a part of the mother liquor from stage (d) to stage (b) and(f) recycling of at least a part of the evaporated solution from stage (c) to stage (b).

公开(公告)号：AU6829500A

公开(公告)日：2001-02-13

申请号：AU6829500

申请日：2000-07-26

Applicant: BASF AG

Inventor： AUER HEINZ ,  DAHLHAUS JURGEN ,  FISCHER KARL ,  HAMMER HANS ,  KELLENBENZ JOCHEN ,  SCHULZ MICHAEL ,  THIEL JOACHIM ,  VICARI MAXIMILIAN

IPC: B01D3/00 ,  B01J3/00 ,  B01J3/02 ,  B01J19/00 ,  C07B61/00 ,  C07C29/80 ,  C07C31/04 ,  C07C67/36 ,  C07C69/06

Abstract: A description is given of a process for preparing methyl formate by reacting excess methanol with carbon monoxide under superatmospheric pressure and at elevated temperature in the presence of alkali metal methoxide or alkaline earth metal methoxide as catalyst in a pressure-rated reactor, in which the use of at least two reactor elements, preferably operated in countercurrent, at about 100° C. and a pressure of about 100 bar in combination with a solids-free desalting of the reaction product makes possible very economical, largely trouble-free production of methyl formate in any desired quality and with a very good production capacity. Furthermore, the process for solids-free desalting and apparatuses for carrying out this process are described.

公开(公告)号：BR9811781A

公开(公告)日：2000-09-12

申请号：BR9811781

申请日：1998-09-09

Applicant: BASF AG

Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BRUELLOS 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：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：DE19909923A1

公开(公告)日：2000-03-02

申请号：DE19909923

申请日：1999-03-06

Applicant: BASF AG

Inventor： SCHROEDER JUERGEN ,  NESTLER GERHARD ,  THIEL JOACHIM ,  ECK BERND

IPC: C07C51/43 ,  C07C51/44 ,  C07C51/487 ,  C07C51/50 ,  C07C57/075 ,  C07C57/05

Abstract: In the production of acrylic acid by gas phase partial oxidation of propane or propene and/or acrolein with oxygen (O2) using heterogeneous catalysis, in which a substance inhibiting free radical polymerization of acrylic acid is added in the separating column, the inhibitor is an aqueous solution containing dissolved N-oxyl radicals as the only polymerization inhibitor. In the production of acrylic acid by gas phase partial oxidation of propane or propene and/or acrolein with oxygen (O2) using heterogeneous catalysis, in which a substance inhibiting free radical polymerization of acrylic acid is added in the separating column, the inhibitor is an aqueous solution containing dissolved N-oxyl radicals as the only polymerization inhibitor. Partial oxidation is carried out at elevated temperature in the presence of an inert diluent gas on catalyst in the solid aggregate state. The hot product gas mixture is cooled directly with a high-boiling liquid (quench liquid 1) at the cooling limit temperature. This is circulated, optionally through an indirect cooling heat exchanger, and part is discharged continuously as outlet for the highest boiling compounds. The cooled product gas mixture is passed into a column with separating inserts and 2 collecting plates, below the inserts, and rises through the column. Part of the high boiling compounds condenses on the plate below the inserts and part of this is used as quench liquid 1, whilst the rest is cooled or heated in an indirect heat exchanger and returned to the lower half of the column, between the 2 plates. Acrylic acid of purity \- 95 wt. % is taken as middle fraction from the second plate at a side port and purified by crystallization. At least part of the mother liquor from crystallization is returned to the column between the 2 plates. The low-boiling fraction is taken as gas stream at the top and cooled directly with quench liquid 2 to condense water and constituents less volatile than water. Part of the condensate (acid water) is recycled to the top of the column to increase the separation capacity, whilst the rest is cooled indirectly in an external heat exchanger and used as quench liquid 2. Constituents more volatile than water are discharged as gas and optionally recycled to gas phase oxidation as diluent gas.

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：DE19829477A1

公开(公告)日：2000-01-05

申请号：DE19829477

申请日：1998-07-01

Applicant: BASF AG

Inventor： BASTIAENSEN ERIK ,  ECK BERND ,  THIEL JOACHIM

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

Abstract: The invention relates to a method for purifying acrylic acid or methacrylic acid by crystallization and distillation, which consists of the following steps: (a) crystallization of a mixture containing the acrylic acid or methacrylic acid, resulting in formation of a product crystallizate enriched with acrylic acid or methacrylic acid and a mother liquor; (b) distillation of at least part of the mother liquor obtained under step (a) to obtain a distillation bottom which is at least partly extracted and an overhead; (c) crystallization of at least part of the overhead obtained under step (b) so as to obtain a crystallization residue which is extracted and a crystallizate; and (d) recirculation of the crystallizate obtained under step (c) into the crystallization process (a).

公开(公告)号：AU9539198A

公开(公告)日：1999-04-05

申请号：AU9539198

申请日：1998-09-09

Applicant: BASF AG

Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BROLLOS 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).