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公开(公告)号：DE19627679A1
公开(公告)日：1998-01-15
申请号：DE19627679
申请日：1996-07-10
Applicant: BASF AG
Inventor： LEHNERT KLAUS , NESTLER GERHARD DR , ECK BERND , MUELLER-ENGEL KLAUS JOACHIM DR
IPC: C07C57/04 , C07C51/43 , C07C57/07 , C07C57/075
Abstract: The invention concerns a process for purifying by crystallization crude acrylic acid containing dibenzo-1,4-thiazine, the diacrylic acid content of the crude acrylic acid being set at a higher value before crystallization.
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公开(公告)号：MX9701227A
公开(公告)日：1997-08-30
申请号：MX9701227
申请日：1997-02-18
Applicant: BASF AG
Inventor： MACHHAMMER OTTO , DAMS ALBRECHT , ECK BERND , PROLL THEO
Abstract: El ácido acrílico o el ácido metacrílico se purifica mediante (a) sometiendo una mezcla que comprende el ácido acrílico o el ácido metacrílico a un proceso de separacion definido con precision, esencialmente en ausencia de un solvente orgánico, con la composicion de la fase en la cual se acumula el ácido acrílico o el ácido metacrílico permaneciendo esencialmente constante cuando cambia la composicion de las otras fases que participan en la transferencia de masa, extrayendo esta fase, y (b) sometiendo por lo menos una parte de la fase restante de la etapa (a) a un proceso de separacion definido con menor precision, y (c) alimentar una de las fases formadas en la etapa (b) al proceso de separacion definido con precision en la etapa (a). Además, la invencion proporciona un proceso para preparar ácido acrílico o ácido metacrílico que incluye el proceso de purificacion mencionado anteriormente.
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公开(公告)号：CA2198142A1
公开(公告)日：1997-08-24
申请号：CA2198142
申请日：1997-02-20
Applicant: BASF AG
Inventor： ECK BERND , PROLL THEO , MACHHAMMER OTTO , DAMS ALBRECHT
Abstract: Acrylic acid or methacrylic acid is purified by (a) subjecting a mixture comprising the acrylic acid or methacrylic acid to a sharply defined separation process essentially in the absence of an organic solvent, with the composition of the phase in which the acrylic acid or methacrylic acid accumulates remaining essentially constant when the composition of the other phases participating in the mass transfer changes, then taking off this phase and (b) subjecting at least a part of the remaining phase from stage(a) to a less sharply defined separation process and (c) feeding one of the phases formed in stage (b) to the sharply defined separation process in stage (a). In addition, the invention provides a process for preparing acrylic acid or methacrylic acid which includes the abovementioned purification process.
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公开(公告)号：CZ298267B6
公开(公告)日：2007-08-08
申请号：CZ43697
申请日：1997-02-12
Applicant: BASF AG
Inventor： MACHHAMMER OTTO , DAMS ALBRECHT , ECK BERND , PROLL THEO
Abstract: Postup prípravy kyseliny (meth)akrylové zahrnující následující stupne: (I) katalytickou oxidaci propenu nebo izobutenu a/nebo akroleinu nebo methakroleinu v plynné fázi na kyselinu (meth)akrylovou zavzniku plynného reakcního produktu obsahujícího kyselinu (meth)akrylovou; (II) absorpci tohoto reakcního produktu za použití vysokovroucího rozpouštedla; (III) rozdelení rozpouštedla s absorbovaným produktem ze stupne (I), které se získá ve stupni (II), na rozpouštedlo a surovou (meth)akrylovou kyselinu pomocí destilace; (IV) vycištení surové (meth)akrylové kyseliny ze stupne (III) krystalizací za vzniku (meth)akrylové kyseliny; a (V) recirkulaci prinejmenším cásti výsledného matecného louhu dostupne (II) a/nebo stupne (III).
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公开(公告)号：DE50206022D1
公开(公告)日：2006-05-04
申请号：DE50206022
申请日：2002-05-02
Applicant: BASF AG
Inventor： HAMMON ULRICH , ECK BERND , BAUMANN DIETER , HEILEK JOERG , MUELLER-ENGEL JOACHIM
IPC: C07B63/00 , C07B61/00 , C07C51/43 , C07C51/47 , C07C51/48 , C07C57/07 , C07D207/26 , C07D207/267
Abstract: The invention relates to a method for the production of a purified melt of a monomer melt obtained by condensation, absorption or extraction in a crystallizer, wherein the inlet to the crystallizer is subjected to a mechanical solid/liquid separation operation.
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Patent Agency Ranking
公开(公告)号：DE50108001D1
公开(公告)日：2005-12-15
申请号：DE50108001
申请日：2001-04-04
Applicant: BASF AG
Inventor： ECK BERND , BAUMANN DIETER , HEILEK JOERG , MUELLER-ENGEL JOACHIM
Abstract: In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.
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公开(公告)号：BR0214089A
公开(公告)日：2004-09-28
申请号：BR0214089
申请日：2002-11-08
Applicant: BASF AG
Inventor： HAMMON ULRICH , BAUMANN DIETER , HEILEK JORG , MULLER-ENGEL KLAUS JOACHIM , ECK BERND
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公开(公告)号：DE10227073A1
公开(公告)日：2003-07-03
申请号：DE10227073
申请日：2002-06-17
Applicant: BASF AG
Inventor： BASTIAENSEN ERIK , ECK BERND , THIEL JOACHIM , ROCHETTE PAUL , BAUMANN DIETER
Abstract: Purification of acrylic acid or methacrylic acid comprises crystallization to form an acrylic acid or methacrylic acid enriched product crystallizate and a mother liquor, distillation of at least a portion of the mother liquor to form a distillation residue that is at least partially drawn off and a head product and crystallization of at least a portion of the head product to form a crystallizate that is recycled. A process for the purification of acrylic acid or methacrylic acid by crystallization and distillation comprises: (A) crystallization of an acrylic or methacrylic acid containing mixture by formation of an acrylic acid or methacrylic acid enriched product crystallizate and a mother liquor; (B) distillation of at least a portion of the mother liquor to form a distillation residue that is at least partially drawn off and a head product; (C) crystallization of at least a portion of the head product to form a crystallization residue that is drawn off and a crystallizate; and (D) recycling of the crystallizate from step (C) to step (A).
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公开(公告)号：CZ20023376A3
公开(公告)日：2003-05-14
申请号：CZ20023376
申请日：2001-04-04
Applicant: BASF AG
Inventor： ECK BERND , BAUMANN DIETER , HEILEK JORG , MULLER-ENGEL KLAUS JOACHIM
Abstract: In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.
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公开(公告)号：DE59707380D1
公开(公告)日：2002-07-11
申请号：DE59707380
申请日：1997-02-20
Applicant: BASF AG
Inventor： MACHHAMMER DR , DAMS DR , ECK BERND , PROLL DR
Abstract: A process for purifying (meth)acrylic acid by phase separation techniques comprises the following steps: (a) a mixture containing (meth)acrylic acid is separated into distinct phases in the presence of an organic solvent, with the composition of the (meth)acrylic acid-rich phase remaining essentially unchanged, and this acid-rich phase is separated; (b) the remaining phase from step (a) is separated into indistinct phases; and (c) one of the phases from step (b) is returned to step (a). Also claimed is preparation of (meth)acrylic acid. Preferably in step (c) the acid-rich phase is returned to step (a). 1-100 (100) wt.% of the phase remaining from step (a) is used in step (b). Pure end product is added to steps (a) and (b). Step (a) involves crystallisation, freezing or sublimation, preferably static and/or dynamic crystallisation, and most preferably a combined static and dynamic crystallisation in which the residue from the dynamic crystallisation is added to the static crystallisation step and the crystallised product from the static crystallisation is returned to the dynamic crystallisation.
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