Title:
CONTINUOUS MANUFACTURE OF TEREPHTHALIC ACID
Document Type and Number:
Japanese Patent JPS54100339
Kind Code:
A
Abstract:
Continuous prodn. of terephthalic acid is effected by introducing into an oxidn. zone a liquid mixt. of dissolving acetic acid (comprising acetic acid and water) and p-xylene contg. a catalyst, the wt. ratio of aq. acetic acid in the reaction mixt. to p-xylene admitted into the oxidation zone being 4-7:1. A gas contg. oxygen is passed into the reaction mixt. and the reaction temp. is kept at 160-180 degrees C. The amt. of water in the acetic acid is 1-7 wt. %. The catalyst is a mixt. of a Co cpd., an Mn cpd. and bromine or a bromide, in which the amt. of Co cpd., determined as metal, is 800-1200 ppm (by wt.) of acetic acid, that of Mn cpd., determined as metal, is 1-30, pref. 1-20 wt. %, based on the Co cpd., as metal, and the amt. of bromine or bromide, determined as Br, is >=2.5, pref. =5 x the combined wt. of Co and Mn cpds., as metals. Residence time of the reaction mixt. in the oxidation zone is 30-120, pref. 40-100 mins. High quality terephthalic acid is produced without excessive consumption of acetic acid by combustion. The acid, after simple treatment, e.g. washing, can be directly esterified to produce PET.
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Inventors:
ROJIYAA JIYON HIISU KOORUZU
Application Number:
JP215879A
Publication Date:
August 08, 1979
Filing Date:
January 11, 1979
Export Citation:
Assignee:
ICI LTD
International Classes:
B01J23/00; B01J31/00; C07B61/00; C07C51/00; C07C51/265; C07C63/26; C07C67/00; (IPC1-7): B01J23/32; B01J23/70; B01J31/04; C07C51/20; C07C63/26