Title:
CHEMICAL RECYCLE OF POLYETHYLENE TEREPHTHALATE WASTE
Document Type and Number:
Japanese Patent JP3715812
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a high-purity polyethylene terephthalate by utilizing a used polyethylene terephthalate as bis-β-hydroxyethyl terephthalate.
SOLUTION: This method comprises a pretreatment process for obtaining a crude polyethylene terephthalate, a depolymerization process for producing a crude bis-β-hydroxyethyl terephthalate (BHET) by adding an excess ethylene glycol for depolymerization, a foreign substance-removing process for removing the foreign plastics and solid foreign substances and/or precipitates other than the polyethylene terephthalate resin, a concentrated BHET producing process by distillation and vaporization, a vacuum vaporization process for obtaining a refined BHET, and a melt-polycondensation process for obtaining a high-purity polyethylene terephthalate polymer.
Inventors:
Shuji Inada
Kikuchi Sato
Kikuchi Sato
Application Number:
JP37510198A
Publication Date:
November 16, 2005
Filing Date:
December 10, 1998
Export Citation:
Assignee:
IS Inc.
International Classes:
B29B13/10; B29B17/02; B29B17/04; C08G63/183; C08J11/08; C08J11/10; B29K67/00; B29K105/26; (IPC1-7): C08J11/10; B29B13/10; B29B17/02; C08G63/183; C08J11/08
Domestic Patent References:
| JP8502079A | ||||
| JP48061447A | ||||
| JP8225496A | ||||
| JP8508011A | ||||
| JP49015255B1 | ||||
| JP7505424A | ||||
| JP2000053802A |
Attorney, Agent or Firm:
Masataka Oshima