METHOD FOR PRODUCING TEREPHTHALIC ACID, AND METHOD FOR PRODUCING RECYCLED POLYETHYLENE TEREPHTHALATE

WIPO Patent Application WO/2016/098764

A1

This method for producing terephthalic acid includes: a first hydrolysis step in which an object to be processed including polyethylene terephthalate is loaded into a sealed container, and subsequently exposed to an atmosphere having a pressure ranging from normal pressure to saturated water vapour pressure to hydrolyse the polyethylene terephthalate, and obtain a hydrolysate including terephthalic acid and/or an oligomer (an ethylene terephthalate oligomer) comprising terephthalic acid and ethylene glycol; and a second hydrolysis step in which the ethylene terephthalate oligomer obtained in the first hydrolysis step is hydrolysed in hot water having a temperature of 150-300˚C to obtain crude terephthalic acid.

JP2003128617	METHOD FOR PRODUCING HIGH PURITY TEREPHTHALIC ACID BY HIGH TEMPERATURE SEPARATION
JP3917811	INDUSTRIAL METHOD FOR RECOVERING TEREPHTHALIC ACID FROM PULVERIZED PRODUCT OF RECOVERED POLYETHYLENE TEREPHTHALATE
JPS6089444	PRODUCTION OF BIPHENYLTETRACARBOXYLIC ACID

YAMAMOTO AKIYOSHI (JP)
ONISHI YOSHIHIRO (JP)
TAKANASHI KOUICHI (JP)
YOSHIKAWA TOSHIYUKI (JP)

PCT/JP2015/085045

June 23, 2016

December 15, 2015

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NITTO DENKO CORP (JP)

C07C51/09; C07C27/02; C07C29/09; C07C31/20; C07C63/26; C08G63/183

JP2007332361A	2007-12-27
JP2003527363A	2003-09-16
JP2008308416A	2008-12-25
JP2015172113A	2015-10-01

Eikoh Patent Firm, P. C. et al. (JP)
Patent business corporation glory patent firm (JP)

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