公开(公告)号：US3654352A

公开(公告)日：1972-04-04

申请号：US3654352D

申请日：1969-04-02

Applicant: CELANESE CORP

Inventor： WITT ENRIQUE R ,  HUMPHREY WILLIAM J ,  SCHNIZER ARTHUR W

IPC: C07C51/487 ,  C07C51/42 ,  C07C51/48

CPC classification number: C07C51/487 ,  C07C63/26 ,  C07C63/24

Abstract: A PROCESS FOR THE PURIFICATION OF TEREPHTHALIC AND/OR ISOPHTHALIC ACID BY RECRYSTALLIZATION OF THE IMPURE ACID FROM THE SOLVENT IN THE PRESENCE OF A COMPOUND HAVING THE

>N-NH2

RADICAL.

公开(公告)号：US3598869A

公开(公告)日：1971-08-10

申请号：US3598869D

申请日：1967-12-05

Applicant: CELANESE CORP

Inventor： VOLPE PETER J ,  HUMPHREY WILLIAM J

IPC: C07C49/403 ,  C07C55/14

CPC classification number: C07C49/403 ,  C07C55/14

Abstract: A REACTION PRODUCT CONSISTING OF (A) CYCLOHEXANONE AND CYCLOHEXANOL (KA) AND (B) A MIXTURE OF CARBOXYLIC ACID DERIVATIVES OF CYCLOHEXANE COMPRISING PREDOMINATLY HYDROXYCAPROIC ACID AND ADIPIC ACID (COP ACIDS), IN WHICH THE RATIO OF COP ACIDS TO KA IS PARTICULARLY SUITABLE FOR SUBSEQUENT CONVERSION TO NYLON SALT BY CONVERTING THE COP ACIDS TO HEXAMETHYLENE-DIAMINE AND THE KA TO ADIPIC ACID, IS OBTAINED BY OXIDZING CYCLOHEANE IN THE LIQUID PHASE AT A CONVERSION PER PASS BETWEEN 14% AND 30%, WITH A REACTION RETENTION TIME BETWEEN ABOUT 6 MINUTES AND 80 MINUTES, AND IN THE PRESENCE OF A CATALYST COMPRISING AT LEAST ONE OF THE GROUP CONSISTING OF COBALT AND CHROMIUM, THE CONVERSION PER PASS AND THE CATALYST COMPOSITION BEING COORDINATED ONE WITH THE OTHER TO ATTAIN THE DESIRED RATIO OF COP ACIDS TO KA IN THE OXIDATION PRODUCT. THE CHROMIUM:COBALT RATIO IN THE OXIDATION CATALYST IS A SIGNIFICANT INDEPENDENT VARIABLE WHICH CAN BE ADJUSTED TO CONTROL THE COP ACIDS:KA RATIO AT A GIVEN CYCLOHEXANE CONVERSION RATE.