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7493084 
Journal Article 
Polyurethane Waste Recycling. 1. Glycolysis and Hydroglycolysis of Water-Blown Foams 
Gerlock, J; Braslaw, J; Zinbo, M 
1984 
0 
Industrial and Engineering Chemistry Product Research and Development
ISSN: 0196-4305 
23 
3 
545-552 
English 
In this paper, glycolysis of toluenedilsocyanate based water-blown polyurethane foam has been examined by high performance liquid chromatography and gel permeation chromatography to determine the product distribution. Glycolysis with diethylene glycol (DEG) yields toluenediamlne (TDA), TDA mono- and di- DEG carbamates, a series of urea-linked mono- and dl- DEG carbamate TDA oligomers, and polyether triol (polyol). The complexity of the product mixture suggests problems in applying simple glycolysis to the recovery of mixed and/or contaminated polyurethane wastes. A simpler product mixture results when water and a base catalyst are added to the glycolysis reaction (hydroglycolysis). Hydroglycolysis yields TDA and polyol as principal products. Data for the rate of the hydroglycolysis reaction are presented in the temperature range of 150 to 190 °C. These results suggest that hydroglycolysis could be used to recover polyols from mixed and/or contaminated water-blown polyurethane wastes. © 1984, American Chemical Society. All rights reserved. 
PLASTICS, FOAMED; WASTE UTILIZATION; GLYCOLYSIS; HYDROGLYCOLYSIS; POLYURETHANES; polyol; polyurethan foam; recycling; solid waste management 
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