公开(公告)号：US3862145A

公开(公告)日：1975-01-21

申请号：US18423271

申请日：1971-09-27

Applicant: STANDARD OIL CO

Inventor： BRENNAN HARRY M ,  LAMB DOUGLAS P

IPC: C07C51/56 ,  C07C63/18

CPC classification number: C07C51/56 ,  C07C63/16

Abstract: Phthalic anhydride is prepared by heating trimellitic acid in the presence of certain metal catalysts such as cobalt, manganese, and cerium as either salts or in the oxide form, and bromine. The trimellitic acid and catalyst are heated and an inert gas is passed through the molten mass to produce a product containing a high concentration of orthophthalic acid which upon further heating yields orthophthalic anhydride or phthalic anhydride.

Abstract translation: 邻苯二甲酸酐通过在某些金属催化剂如钴，锰和铈作为盐或氧化物形式的存在下加热偏苯三酸和溴来制备。 将偏苯三酸和催化剂加热并使惰性气体通过熔融物质以产生含有高浓度邻苯二甲酸的产物，其在进一步加热时产生邻苯二甲酸酐或邻苯二甲酸酐。