公开(公告)号：CA2303373A1

公开(公告)日：1999-03-25

申请号：CA2303373

申请日：1998-09-10

Applicant: BASF AG

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

IPC: B01D5/00 ,  C07C51/44 ,  C07C57/07

Abstract: The invention relates to a method for the fractional condensation of a gas mixture which contains at least one other condensable constituent in addition to acrylic acid or methacrylic acid and which also has a high proportion of one or several non-condensable constituents. According to said method, the gas mixture is passed through a column with separation-efficient baffles and the condensable constituents are condensed out by cooling.

公开(公告)号：DE19740252A1

公开(公告)日：1999-03-18

申请号：DE19740252

申请日：1997-09-12

Applicant: BASF AG

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

IPC: C07C51/43 ,  C07C51/44 ,  C07C57/07 ,  C07C57/05

Abstract: Acrylic and methacrylic acid can be synthesized by catalytic gas phase oxidation of 3-4C alkanes, alkenes, alcohols and/or aldehydes. This process for the production of acrylic acid or methacrylic acid comprises: (A) production of a gaseous product mixture comprising the reaction mixture arising from the (B) condensation of the gaseous product mixture (C) crystallization of acrylic acid or methacrylic acid from the resulting solution. (D) separation of the crystals from the mother liquor and (E) recycling of at least a portion of the mother liquor from (D) to (B).

公开(公告)号：AU3344097A

公开(公告)日：1998-02-02

申请号：AU3344097

申请日：1997-06-24

Applicant: BASF AG

Inventor： LEHNERT KLAUS ,  MULLER-ENGEL KLAUS JOACHIM ,  NESTLER GERHARD ,  ECK BERND

IPC: C07C57/04 ,  C07C51/43 ,  C07C57/07 ,  C07C57/075

Abstract: PCT No. PCT/EP97/03304 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Jun. 24, 1997 PCT Pub. No. WO98/01414 PCT Pub. Date Jan. 15, 19981,4-Dibenzothiazine-comprising crude acrylic acid is purified by crystallization by raising its diacrylic acid content to at least 1% by weight prior to the crystallization step.

公开(公告)号：DE19536859A1

公开(公告)日：1997-04-03

申请号：DE19536859

申请日：1995-10-02

Applicant: BASF AG

Inventor： SCHMIDT-RADDE MARTIN DR ,  HELFERT HERBERT DR ,  ECK BERND ,  MALTRY BERNHARD

IPC: C07B63/00 ,  C07D207/26 ,  C07D207/267

Abstract: Purification of N-vinylpyrrolidone (I) comprises crystallisation in a crystalliser. The process includes pre-coating the surfaces of the crystalliser, on which crystals are to be grown during the crystallisation, with a seed layer of (I).

公开(公告)号：ES2175794T5

公开(公告)日：2008-03-01

申请号：ES98948948

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: Procedimiento para la separación de ácido acrílico o ácido metacrílico a partir de una mezcla gaseosa, que contiene, además de ácido acrílico o ácido metacrílico, aún al menos otro componente, caracterizado porque a) se condensa la mezcla gaseosa, b) se cristaliza ácido acrílico o ácido metacrílico a partir de la disolución obtenida en la etapa a), c) se separa los cristales obtenidos a partir de las aguas madre de la etapa b), y d) se devuelve al menos una cantidad parcial de las aguas madre de la etapa c) a la etapa a) tras la separación.

公开(公告)号：MY122594A

公开(公告)日：2006-04-29

申请号：MYPI20002548

申请日：2000-06-07

Applicant: BASF AG

Inventor： ECK BERND ,  HEILEK JOERG ,  BAUMANN DIETER ,  SCHLIEPHAKE VOLKER DR

IPC: C07C51/64 ,  C07C57/07 ,  C07C51/25 ,  C07C51/43 ,  C07C51/47 ,  C07C57/05

Abstract: ACRYLIC ACID OR METHACRYLIC ACID IS PURIFIED BY CRYSTALLIZATION TO OBTAIN CRYSTALS AND A MOTHER LIQUOR, BY A PROCESS IN WHICH THE CRYLTALS ARE WASHED WITH A WASH LIQUID CONTAINING THE ACID AND HAVING A TEMPERATURE FROM 15 TO 40 C. FURTHERMORE, A PROCESS FOR THE PREPARATION OF ARCYLIC ACID OR METHACRYLIC ACID COMPRISES THE ABOVEMENTIONED PURIFICATION PROCESS.

公开(公告)号：DE10332758A1

公开(公告)日：2004-05-27

申请号：DE10332758

申请日：2003-07-17

Applicant: BASF AG

Inventor： ECK BERND ,  HAMMON ULRICH ,  MUELLER-ENGEL KLAUS JOACHIM ,  SCHROEDER JUERGEN ,  THIEL JOACHIM ,  MARTAN HANS

IPC: B01D3/14 ,  B01D3/32 ,  C07C51/215 ,  C07C51/25 ,  C07C51/43 ,  C07C51/44 ,  C07C57/07 ,  C07C57/05

Abstract: A thermal separation process for the separation of at least one (meth)acrylic monomer enriched material stream from a (meth)acrylic monomer containing mixture comprises use of a device having separate volume elements in which the liquid temperature does not differ by more than 2 degreesC and the total residence time is no greater than 20 hours. A thermal separation process for the separation of at least one (meth)acrylic monomer enriched material stream from a (meth)acrylic monomer containing mixture, comprising the continuous stationary operation of at least one thermal separation device comprising at least one separating chamber optionally containing inserts to which at least one (meth)acrylic monomer containing stream is removed whereby the material stream that is fed to the separator chamber contains x wt.% of components that are different to (meth)acrylic monomers; the material stream having the highest content by weight of (meth)acrylic monomers that is removed from the separator chamber contains y wt.% of components that are different to (meth)acrylic monomers whereby the ratio x:y is at least 5; the separator chamber, excluding inlets and outlets is bordered by a solid phase, comprises at least one recirculating heat exchanger and has a liquid phase filled total volume of at least 1 m3 whereby the temperature of the liquid phase is at least 80 degreesC; and is characterized by subdivision of the separating cavity into n individual volume elements whereby the highest and lowest temperature in the liquid phase within the separate volume elements does not differ by more than 2 degreesC; the total residence time is as defined by equation (1) and is no greater than 20 hours. tges = integral(i=1 to n) msi/mi x 2A (1) To = 100 degreesC; Ti = the arithmetic mean value of the highest and lowest temperature in i volume elements; msi = the total mass of (meth)acrylic monomers in i volume elements containing liquid phase; mi = the total liquid phase mass flow from i volume element. The total amount of liquid phase contained within dead-volume elements is not greater than 5 wt.% of the total liquid phase within the separator chamber.

公开(公告)号：DE10223058A1

公开(公告)日：2003-12-11

申请号：DE10223058

申请日：2002-05-24

Applicant: BASF AG

Inventor： HAMMON ULRICH ,  BAUMANN DIETER ,  HEILEK JOERG ,  MUELLER-ENGEL KLAUS JOACHIM ,  ECK BERND

IPC: B01D9/00 ,  C07C7/14 ,  C07C57/07 ,  C07D207/26 ,  C07D207/267 ,  C08G69/24 ,  C08L39/06

Abstract: Process for the separation of crystals from suspension in a mother liquor comprises addition of the suspension to a wash column having a wall enveloping a process chamber. The wall is of metal and the face away from the process chamber is heated along at least the length of the purified melt zone. A process for the separation of crystals from suspension in a mother liquor comprises: (a) addition of the suspension to a wash column having a wall enveloping a process chamber, (b) feeding of the suspension to the process chamber to form a bed of crystals in the chamber and (c) conveying of the bed of crystals in the process chamber by means of gravity with a counter current flow of a purified melt of the crystals to form a wash front such that the bed of crystals is partitioned into a mother liquor zone and a purified melt zone. The wall is of metal and is heated on the face away from the process chamber along at least the length of the purified melt zone.

公开(公告)号：BR9911664A

公开(公告)日：2001-03-20

申请号：BR9911664

申请日：1999-06-30

Applicant: BASF AG

Inventor： BASTIAENSEN ERIK ,  ECK BERND ,  THIEL JOACHIM

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

Abstract: In a process for the purification of acrylic acid or methacrylic acid by crystallization and distillation, the following steps are carried out:(a) crystallization of a mixture containing the acrylic acid or methacrylic acid with formation of product crystals having a higher concentration of acrylic acid or methacrylic acid and of a mother liquor,(b) distillation of at least part of the mother liquor from step (a) with formation of a distillation residue, which is at least partly removed, and of a top product,(c) crystallization of at least part of the top product from step (b) with formation of a crystallization residue, which is removed, and of crystals and(d) recycling of the crystals from step (c) to the crystallization (a).

公开(公告)号：DE19926082A1

公开(公告)日：2000-12-14

申请号：DE19926082

申请日：1999-06-08

Applicant: BASF AG

Inventor： ECK BERND ,  HEILEK JOERG ,  BAUMANN DIETER ,  SCHLIEPHAKE VOLKER

IPC: C07C51/64 ,  C07C51/25 ,  C07C51/43 ,  C07C51/47 ,  C07C57/05 ,  C07C57/07

Abstract: The invention relates to a method of purifying and producing acrylic acid or methacrylic acid by crystallization. As a result of the crystallization, a crystallized product and a mother liquor is obtained and the crystallized product is washed at a temperature of 15 to 40 DEG C with a wash solution that contains the acid. The invention further relates to a method of producing acrylic acid or methacrylic acid that comprises the above-mentioned purification method.