公开(公告)号：US3850981A

公开(公告)日：1974-11-26

申请号：US14360471

申请日：1971-05-14

Applicant: CELANESE CORP

Inventor： TREBELLAS J ,  THIGPEN H ,  MAYS W

IPC: C07C51/265 ,  C07C63/02

CPC classification number: C07C51/265 ,  C07C63/16 ,  C07C63/26 ,  C07C63/24

Abstract: 1. A CONTINUOUS PROCESS FOR THE LIQUID PHASE OXIDATION OF M-XYLENE OR P-XYLENE TO THE CORRESPONDING BENZENE DICARBOXYLIC ACID COMPRISING: (A) CONTINUOUSLY FEEDING M-XYLENE AND/OR P-XYLENE, ACETALDEHYDE, AN OXYGEN-CONTAINING GAS, ACETIC ACID AND A SOLUBLE COBALT SALT CATALYST TO A REACTOR HAVING A GAS PHASE AND A LIQUID-SOLID SLURRY PHASE, THE AMOUNT OF OXYGEN-CONTAINING GAS BEING SUFFICIENT TO PROVIDE AT LEAST 3.25 MOLES OXYGEN PER MOLE OF XYLENE, THE WEIGHT RATIO OF ACETALDEHYDE TO XYLENE BEING AT LEAST 0.2:1, THE WEIGHT RATIO OF ACETIC ACID TO XYLENE BEING FROM ABOUT 3:1 TO 15:1 AND THE AMOUNT OF CATALYST BEING SUFFICIENT FO PROVIDE ABOUT 0.1 TO 2.5% COBALT METAL BASED ON THE COMBIND WEIGHT OF XYLENE, ACETIC ACID AND ACETALDEHYDE, (B) MAINTAINING BACKMIXING CONDITIONS IN THE LIQUIDSOLID SLURRY PHASE OF SAID REACTOR, MAINTAINING IN SAID REACTOR A STEADY STATE CONCENTRATION OF AROMATIC BENZENE DICARBOXYLIC ACID PRECURSORS OF LESS THAN 3% BY WEIGHT OF THE LIQUID-SOLID SLURRY PHASE PRESENT, A TEMPERATURE OF FROM 120-140*C., A PRESSURE OF AT LEAST 95 P.S.I.G., AND MAINTAINING THE AVERAGE RESIDENCE TIME OF THE REACTANTS IN THE REACTOR SUCH THAT AT LEAST 98.6% OF THE XYLENE FED IS CONVERTED TO SOME OTHER PRODUCT AND (C) CONTINUOUSLY WITHDRAWING FORM SAID REACTOR A PORTION OF THE LIQUID-SOLID SLURRY PHASE AND A PORTION OF THE GASEOUS PHASE AND RECOVERING TEREPHTHALIC ACID FROM SAID PORTION WITHDRAWN FROM SAID LIQUID-SOLID SLURRY PHASE.