公开(公告)号：DE59701502D1

公开(公告)日：2000-05-31

申请号：DE59701502

申请日：1997-08-21

Applicant: DEGUSSA

Inventor： JELKO STEFAN ,  SCHOENGEN ANTON ,  KORTE DR ,  FRANZ DR ,  SREBNY DR ,  JOSTMANN DR ,  STEDING DR

IPC: C07C67/39 ,  C07C69/76 ,  C07C69/82

Abstract: A method for the oxidation of p-xylene (pX) and methyl p-toluate (pTE) with oxygen-containing gases in the Witten- Hercules process for production of dimethyl terephthalate (DMT) in at least two successive part-stages in presence of a catalyst. The process comprises (a) at least one pX-rich part-stage in which part of the pX, and optionally recycled products with oxidisable components from further stages in the DMT process, is/are oxidised in presence of 5-30 wt% pTE (based on the oxidation mixture in this stage), and/or (b) at least one pTE- rich part-stage in which pTE and/or p-toluic acid (pTS), and optionally recycled products, is/are oxidised in presence of 2-30 wt% pX (based on pTE + pTS).