Title:
METHOD FOR PRODUCING TEREPHTHALIC ACID AND METHOD FOR PRODUCING REGENERATED POLYETHYLENE TEREPHTHALATE
Document Type and Number:
Japanese Patent JP2016113420
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a terephthalic acid that can process a material to be processed including polyethylene terephthalate by chemical recycling technology without requiring a large-scale apparatus and a cost and can recover a terephthalic acid as a synthetic raw material of the polyethylene terephthalate with high quality and to provide a method for producing a regenerated polyethylene terephthalate produced by using the resultant terephthalic acid.SOLUTION: The method for producing a terephthalic acid includes a first hydrolysis step of storing a material to be processed including polyethylene terephthalate in a closed vessel and then hydrolyzing the polyethylene terephthalate by exposing the material to an atmosphere of a normal pressure to a saturated water vapor pressure to produce an oligomer (an ethylene terephthalate oligomer) composed of a terephthalic acid or a terephthalic acid and/or ethylene glycol and a second hydrolysis step of hydrolyzing the ethylene terephthalate oligomer produced in the first hydrolysis step in hot water of 150 to 300°C to produce a crude terephthalic acid.SELECTED DRAWING: Figure 1
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Inventors:
YAMAMOTO AKIYOSHI
ONISHI YOSHIHIRO
TAKANASHI KOICHI
YOSHIKAWA TOSHIYUKI
ONISHI YOSHIHIRO
TAKANASHI KOICHI
YOSHIKAWA TOSHIYUKI
Application Number:
JP2014254183A
Publication Date:
June 23, 2016
Filing Date:
December 16, 2014
Export Citation:
Assignee:
NITTO DENKO CORP
International Classes:
C07C51/09; C07C27/02; C07C29/09; C07C31/20; C07C63/26; C08G63/183
Attorney, Agent or Firm:
Patent business corporation glory patent office
Yuriko Hamada
Kimihide Hashimoto
Yuriko Hamada
Kimihide Hashimoto