公开(公告)号：US20170297998A1

公开(公告)日：2017-10-19

申请号：US15513775

申请日：2015-09-21

Applicant: BASF SE

Inventor： Armin SCHRAUT ,  Martin KALLER ,  Rob BRONNEBERG ,  Jasmin STAMMER ,  Martin DAS ,  Gerrit HARNISCHMACHER

IPC: C07C67/08 ,  B01J19/00 ,  B01D3/36 ,  C07C67/58

CPC classification number: C07C67/08 ,  B01D3/36 ,  B01J19/0013 ,  B01J19/0066 ,  B01J2219/00094 ,  C07C67/58 ,  C07C69/82

Abstract: The present invention relates to a process for preparing a terephthalic diester by reacting terephthalic acid with at least one alcohol, wherein terephthalic acid is suspended in the alcohol in a dispersing tank, the preliminary suspension is passed from the dispersing tank into a reactor and converted in the presence of an esterification catalyst, and water of reaction is distilled off together with the vapor as alcohol-water azeotrope, the vapor is at least partly condensed, the condensate is separated into an aqueous phase and an organic phase and the organic phase is conducted through a column in which the organic phase is run counter to at least a portion of the vapor, and the organic phase is collected in the lower region of the column and at least partly passed into the dispersing tank.