公开(公告)号：US3654350A

公开(公告)日：1972-04-04

申请号：US3654350D

申请日：1970-01-14

Applicant: CELANESE CORP

Inventor： WITT ENRIQUE R ,  BLAY JORGE A

IPC: C07C51/42

CPC classification number: C07C51/42 ,  C07C63/26

Abstract: DISCLOSED HEREIN ARE SEVERAL PROCESSES FOR PURIFYING TEREPHTHALIC ACID (TPA). THE PRIMARY INVENTIVE CONCEPT DISCLOSED HEREIN EXISTS IN THE USE OF A MINOR AMOUNT OF WATER TO SUPPRESS COLOR FORMATION. A SUBSTANTIALLY HOMEGENEOUS ADMIXTURE OF TPA, A SMALL AMOUNT OF WATER, AND PREFERABLY AN AGENT, E.G. ACETIC ACID, TO PROMOTE DESTRUCTION OF 4-CARBOXYBENZALDEHYDE (CBA) IS HEATED TO THE MELTING POINT OF THE ADMIXTURE FOR A TIME SUFFICIENT TO REDUCE THE CONCENTRATION OF CBA TO THE DESIRED LEVEL.

公开(公告)号：US3887613A

公开(公告)日：1975-06-03

申请号：US16785771

申请日：1971-07-30

Applicant: CELANESE CORP

Inventor： BLAY JORGE A

IPC: C07C51/43 ,  C07C63/26 ,  C07C51/42

CPC classification number: C07C51/43 ,  C07C63/26

Abstract: A process for the purification of terephthalic acid (TPA) by heating the TPA and a liquid medium in the presence of a Group IB, II-B or VIII catalyst to above 325*C followed by cooling of the heated mixture so as to crystallize the purified terephthalic acid. The heating above 325*C is preferably to a temperature such that no TPA remains as a solid.

Abstract translation: 一种通过在IB，II-B或VIII族催化剂存在下将TPA和液体介质加热至325℃以上来纯化对苯二甲酸（TPA）的方法，随后冷却加热的混合物，使结晶 纯对苯二甲酸。 325℃以上的加热优选为没有TPA作为固体残留的温度。

公开(公告)号：US3644507A

公开(公告)日：1972-02-22

申请号：US3644507D

申请日：1968-11-29

Applicant: CELANESE CORP

Inventor： WITT ENRIQUE R ,  BLAY JORGE A

IPC: C07C51/43 ,  C07C51/42

CPC classification number: C07C51/43 ,  C07C63/26

Abstract: A PROCESS FOR THE PURICICATION OF CRUDE TEREPHTHALIC ACID (TPA) BY HEATING THE CRUDE TPA AND A LIQUID MEDIUM IN THE PRESENCE OF AN IODINE OR BROMINE CATALYST OT AN ELEVATED TEMPERTURE FOLLOWED BY COOLING OF THE HEATING MIXTURE SO AS TO CRYSTLLIZE THE TPA. THE HEATING REQUIRE IS TO A TEMPERATURE ABOVE ABOUT 275*C. A ND SHOULD PREFERABLY BE TO A TEMPERATURE SUCH THAT NO TPA REMAINS AS A SOLID.