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1. 发明专利

CA2196917A1 CONTINUOUS PREPARATION OF ALKYL ESTERS OF (METH)ACRYLIC ACID 未知
公开(公告)号：CA2196917A1
公开(公告)日：1997-08-07
申请号：CA2196917
申请日：1997-02-05
申请人： IFFLAND GABRIELE , DAMS ALBRECHT , WECK ALEXANDER , AICHINGER HEINRICH , HERBST HOLGER , NESTLER GERHARD , EXNER HERBERT , SCHMIDT WILLI , GEISENDOERFER MATTHIAS , DOCKNER TONI
发明人： IFFLAND GABRIELE , DAMS ALBRECHT , WECK ALEXANDER , AICHINGER HEINRICH , HERBST HOLGER , NESTLER GERHARD , EXNER HERBERT , SCHMIDT WILLI , GEISENDOERFER MATTHIAS , DOCKNER TONI
IPC分类号： B01J27/02 , B01J31/02 , C07B61/00 , C07C67/08 , C07C67/54 , C07C69/54
摘要： In the process for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with monohydric alkanols having from 1 to 8 carbon atoms in the presence of an acid esterification catalyst in a reaction zone, there is discharged from the reaction zone a product mixture which comprises the alkyl (meth)acrylate formed, the catalyst and the by-products formed during the course of the esterification having boiling points higher than that of the alkyl (meth)acrylate, and from which the alkyl (meth)acrylate is separated by distillation in a separation zone. The product mixture discharged from the reaction zone is fed to a rectification unit (I), in this unit the product mixture discharged is separatedby rectification into at least one product (I) comprising the alkyl ester of (meth)acrylic acid and a product (II) comprising the catalyst, the product (I) is fed to a further rectification unit (II) and in this the alkyl ester of (meth)acrylic acid is separated off by rectification.

2. 发明专利

CA2196913A1 CONTINUOUS PREPARATION OF ALKYL ESTERS OF (METH)ACRYLIC ACID 未知
公开(公告)号：CA2196913A1
公开(公告)日：1997-08-07
申请号：CA2196913
申请日：1997-02-05
申请人： SCHMIDT WILLI , GEISENDOERFER MATTHIAS , DOCKNER TONI , HERBST HOLGER , NESTLER GERHARD , WECK ALEXANDER
发明人： SCHMIDT WILLI , GEISENDOERFER MATTHIAS , DOCKNER TONI , HERBST HOLGER , NESTLER GERHARD , WECK ALEXANDER
IPC分类号： B01J31/02 , C07B61/00 , C07C67/08 , C07C67/54 , C07C69/54
摘要： In a process for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with alkanols having from 1 to 8 carbon atoms in a homogeneous, liquid, solvent-free phase at elevated temperature and in the presence of an acid esterification catalyst, in which the (meth)acrylic acid, the alkanol and the acid catalyst are fed to a reaction zone, the water formed is removed by rectification during a residence time as constituent of a mixture comprising starting alkanol in a rectification unit (III) superposed on the reaction zone, the distillate obtained is separated into an organic phase comprising alkanol and an aqueous phase comprising water, the organic phase is essentially completely returned to the rectification unit (III), the reaction mixture is discharged from the reaction zone and conveyed into a distillative separation zone comprising further rectification units and in the latter the alkyl (meth)acrylate formed is separated off. a) (Meth)acrylic acid and alkanol are reacted in a molar ratio of from 1:0.75 to 1:2, b) part of the aqueous phase obtained at the top of the rectification unit (III) is returned to the rectification unit, c) the reaction mixture discharged from the reaction zone is fed to a further rectification unit (I) and in this the reaction mixture is separated into a product (II) comprising the catalyst and a product (I) comprising the alkyl ester of (meth)acrylic acid, remaining alkanol and remaining (meth)acrylic acid, and d) the product (I) is fed to a further rectification unit (II) and in this the alkyl ester of (meth)acrylic acid is separated from the remaining alkanol and from the remaining (meth)acrylic acid and the remaining alkanol and the remaining (meth)acrylic acid are returned to the reaction zone.

3. 发明专利

CA2184197A1 ESTERIFICATION OF (METH)ACRYLIC ACID WITH AN ALKANOL 未知
公开(公告)号：CA2184197A1
公开(公告)日：1997-03-29
申请号：CA2184197
申请日：1996-08-26
申请人： AICHINGER HEINRICH , GEISENDOERFER MATTHIAS , HERBST HOLGER , NESTLER GERHARD
发明人： AICHINGER HEINRICH , GEISENDOERFER MATTHIAS , HERBST HOLGER , NESTLER GERHARD
IPC分类号： C07C27/02 , C07C67/08 , C07C67/327 , C07C67/60 , C07C69/54
摘要： In a process for esterifying (meth)acrylic acid with an alkanol in the presence of an acidic esterification catalyst, in which unconverted starting compounds and the (meth)acrylates to be formed are separated off by distillation and an oxyester-containing bottom product is formed, the bottom product is separated off and is heated in the presence of an acid to 150250.degree.C and the pressure is adjusted so that the cleavage products formed under the abovementioned conditions from the oxyesters contained in the bottom product evaporate directly. The process can be carried out in the presence of molecular oxygen. Mineral acids, for example sulfuric acid or phosphoric acid and/or alkanesulfonic or arylsulfonic acids, for example methanesulfonic acid or p-toluenesulfonic acid, can be added to the bottom product.

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