Method for the Chemical Depolymerization of Waste Polyethylene Terephthalate

0382191 - ÚCHP 2013 RIV eng P - Patent Document
Hájek, Milan - Sobek, Jiří - Brustman, Jaroslav
Method for the Chemical Depolymerization of Waste Polyethylene Terephthalate.
2012. Owner: Ústav chemických procesů AV ČR, v. v. i. Date of the patent acceptance: 19.09.2012. Patent Number: CN101688015
Institutional support: RVO:67985858
Keywords : microwave * depolymerization * pet
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
http://worldwide.espacenet.com/publicationDetails/originalDocument?FT=D&date=20120919&DB=worldwide.espacenet.com&locale=en_EP&CC=CN&NR=101688015B&KC=B&ND=4.

A method for the chemical depolymerization of waste polyethylene terephthalate by application of microwave radiation and solvolysis in the presence of a catalyst comprising the first stage where the waste polyethylene terephthalate is mixed up with an microwaves absorbing activator, the mixture is melted by its exposing to a microwave radiation on a frequency from 915 to 2450 MHz and with a poweroutput from 0.1 to 0.5 kW per kg of a charge, at a temperature from 230 to 330 DEG C, under atmospheric pressure and the second stage, where the molten mixture is subjected to solvolysis, including acidic or basic hydrolysis, alcoholysis or glycolysis in the presence of a catalyst under continuing microwave radiation and atmospheric pressure yielding terephthalic acid, salts or esters thereof, and ethylene glycol.
Permanent Link: http://hdl.handle.net/11104/0212484