公开(公告)号：EP0931049A1

公开(公告)日：1999-07-28

申请号：EP97944793.0

申请日：1997-08-26

申请人： BASF AKTIENGESELLSCHAFT

发明人： KROKER, Ruprecht ,  WIEDEMANN, Manfred

IPC分类号： B01D3 ,  C07C51 ,  C07C57

CPC分类号： C07C51/44 ,  Y10S203/22 ,  C07C57/04

摘要： A process is disclosed for separating by distillation pure (meth)acrylic acid from mixtures which contain (meth)acrylic acid, as well as dimers and oligomers of (meth)acrylic acid, and which are substantially free from aldehydes and components with a lower boiling point than (meth)acrylic acid. A distiller used for that purpose has a thin film evaporator, a condenser and a connection with a deflector between the thin film evaporator and the condenser.

公开(公告)号：EP1305276A2

公开(公告)日：2003-05-02

申请号：EP01971794.1

申请日：2001-07-27

申请人： BASF AKTIENGESELLSCHAFT

发明人： KROKER, Ruprecht ,  NESTLER, Gerhard ,  SCHMITT, Werner ,  SCHUMM, Winfried

IPC分类号： C07C67/04 ,  C07C69/54 ,  B01D1/06 ,  B01D1/22 ,  C07C67/54

CPC分类号： C07C67/04 ,  B01D1/065 ,  C07C67/54 ,  Y10S203/09 ,  C07C69/54

摘要： The invention relates to a method for producing a tertiary C4-C8 alkyl (meth)acrylate by reacting (meth)acryl acid with an olefin of formula (I), wherein R?1 and R2¿, which can be identical or different, represent methyl or ethyl and R3 represents H, methyl or ethyl, in a homogeneous phase in the presence of an acidic catalyst and extracting the tertiary C¿4?-C8 alkyl(meth)acrylate from the reaction mixture. According to the invention, the catalyst is separated as a residue in a two-stage distillation of the reaction mixture and the tertiary C4-C8 alkyl(meth)acrylate is extracted from the distillation. The inventive method permits the use of (meth)acryl acid that contains acetic acid. The risk of a breakdown of the ester and the polymerization of the (meth)acryl compounds is reduced. The invention also relates to a falling film evaporator comprising a cylindrical casing (2), a plurality of evaporation tubes (3) located in said casing (2), means (4) for supplying the liquid to be evaporated and means (5) for heating the evaporation tubes (3). Said evaporator is characterised in that at least one evaporation tube (3) has a closed head region (6), into which a supply line (7) for the liquid to be evaporated opens, said supply line (7) communicating with the means (4) for supplying the liquid to be evaporated.

公开(公告)号：EP1305276B1

公开(公告)日：2004-05-19

申请号：EP01971794.1

申请日：2001-07-27

申请人： BASF AKTIENGESELLSCHAFT

发明人： KROKER, Ruprecht ,  NESTLER, Gerhard ,  SCHMITT, Werner ,  SCHUMM, Winfried

IPC分类号： C07C67/04 ,  C07C69/54 ,  B01D1/06 ,  B01D1/22 ,  C07C67/54

CPC分类号： C07C67/04 ,  B01D1/065 ,  C07C67/54 ,  Y10S203/09 ,  C07C69/54

摘要： The invention relates to a method for producing a tertiary C4-C8 alkyl (meth)acrylate by reacting (meth)acryl acid with an olefin of formula (I), wherein R?1 and R2¿, which can be identical or different, represent methyl or ethyl and R3 represents H, methyl or ethyl, in a homogeneous phase in the presence of an acidic catalyst and extracting the tertiary C¿4?-C8 alkyl(meth)acrylate from the reaction mixture. According to the invention, the catalyst is separated as a residue in a two-stage distillation of the reaction mixture and the tertiary C4-C8 alkyl(meth)acrylate is extracted from the distillation. The inventive method permits the use of (meth)acryl acid that contains acetic acid. The risk of a breakdown of the ester and the polymerization of the (meth)acryl compounds is reduced. The invention also relates to a falling film evaporator comprising a cylindrical casing (2), a plurality of evaporation tubes (3) located in said casing (2), means (4) for supplying the liquid to be evaporated and means (5) for heating the evaporation tubes (3). Said evaporator is characterised in that at least one evaporation tube (3) has a closed head region (6), into which a supply line (7) for the liquid to be evaporated opens, said supply line (7) communicating with the means (4) for supplying the liquid to be evaporated.

公开(公告)号：EP1305275A1

公开(公告)日：2003-05-02

申请号：EP01958028.1

申请日：2001-07-27

申请人： BASF AKTIENGESELLSCHAFT

发明人： KROKER, Ruprecht ,  NESTLER, Gerhard ,  SCHMITT, Werner ,  SCHUMM, Winfried

IPC分类号： C07C67/04 ,  C07C69/54 ,  C07C69/14

CPC分类号： C07C67/04 ,  Y02P20/582 ,  C07C69/14 ,  C07C69/54

摘要： The invention relates to a method for the continuous production of the tert-butyl ester of an aliphatic C1-C4 carboxylic acid by reacting the carboxylic acid with isobutene in a liquid phase in the presence of an acid catalyst. The reaction is carried out in a reactor divided into several sections. The carboxylic acid, the iso-olefin and the catalyst are introduced into the first section of the reactor, the reaction mixture obtained is removed from the last section of the reactor, and the ester is extracted from said mixture. The reaction temperature in the reactor is controlled in such a way that it ranges from 10 to 40 °C and is highest in the first section of the reactor. The inventive method enables tertiary butyl esters of saturated and unsaturated C1-C4 carboxylic acids to be produced economically and in a technically simple and environmentally friendly manner.

公开(公告)号：EP1305275B1

公开(公告)日：2004-11-17

申请号：EP01958028.1

申请日：2001-07-27

申请人： BASF AKTIENGESELLSCHAFT

发明人： KROKER, Ruprecht ,  NESTLER, Gerhard ,  SCHMITT, Werner ,  SCHUMM, Winfried

IPC分类号： C07C67/04 ,  C07C69/54 ,  C07C69/14

CPC分类号： C07C67/04 ,  Y02P20/582 ,  C07C69/14 ,  C07C69/54

摘要： The invention relates to a method for the continuous production of the tert-butyl ester of an aliphatic C1-C4 carboxylic acid by reacting the carboxylic acid with isobutene in a liquid phase in the presence of an acid catalyst. The reaction is carried out in a reactor divided into several sections. The carboxylic acid, the iso-olefin and the catalyst are introduced into the first section of the reactor, the reaction mixture obtained is removed from the last section of the reactor, and the ester is extracted from said mixture. The reaction temperature in the reactor is controlled in such a way that it ranges from 10 to 40 °C and is highest in the first section of the reactor. The inventive method enables tertiary butyl esters of saturated and unsaturated C1-C4 carboxylic acids to be produced economically and in a technically simple and environmentally friendly manner.

公开(公告)号：EP0931049B1

公开(公告)日：2002-07-10

申请号：EP97944793.5

申请日：1997-08-26

申请人： BASF AKTIENGESELLSCHAFT

发明人： KROKER, Ruprecht ,  WIEDEMANN, Manfred

IPC分类号： C07C57/04 ,  C07C51/44 ,  B01D1/30

CPC分类号： C07C51/44 ,  Y10S203/22 ,  C07C57/04

摘要： A process is disclosed for separating by distillation pure (meth)acrylic acid from mixtures which contain (meth)acrylic acid, as well as dimers and oligomers of (meth)acrylic acid, and which are substantially free from aldehydes and components with a lower boiling point than (meth)acrylic acid. A distiller used for that purpose has a thin film evaporator, a condenser and a connection with a deflector between the thin film evaporator and the condenser.