公开(公告)号：BR9713407A

公开(公告)日：2000-01-25

申请号：BR9713407

申请日：1997-11-21

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  FRIEDMAN MICHAEL ,  NESTLER GERHARD

IPC: C07C67/08 ,  C07C67/58 ,  C07C69/54

Abstract: (Meth)acrylic esters are prepared by reacting (meth)acrylic acid with a C4-C12-alkanol in the presence of sulfuric acid or a mono-C4-C12-alkyl sulfate as catalyst, whereina) the reaction is carried out in an esterification unit which comprises a first reactor and at least one further reactor,b) a mixture of (meth)acrylic acid, C4-C12-alkanol and catalyst which contains not more than 5% by weight of water, based on the sum of the starting materials, is introduced into the first reactor,c) the esterification in the first reactor is conducted without removing ester, alkanol or water to a (meth)acrylic acid conversion of at least 40%, but only so far that the mixture remains a single phase, andd) the esterification is continued in at least one further reactor with the water formed being removed by distillation.

公开(公告)号：BR9806781A

公开(公告)日：2000-05-16

申请号：BR9806781

申请日：1998-01-08

Applicant: BASF AG

Inventor： AICHINGER HEINRICH ,  FRIEDMAN MICHAEL ,  NESTLER GERHARD ,  HERBST HOLGER

IPC: C07C67/08 ,  C07C67/327 ,  C07C67/54 ,  C07C67/60 ,  C07C69/54

Abstract: In a process for esterifying (meth)acrylic acid with an alkanol, oxy ester formed as a byproduct of the esterification is recleaved under acid catalysis with addition of monomeric and/or oligomeric (meth)acrylic acid and water.