Process Economics Program Report 45A
Polyols for Making Polyurethanes 45A
Published: May 1982
Polyols evaluated in this report are: a trifunctional polyester polyol; three polyols of high functionality made from sucrose, sucroseamine, and an aromatic compound containing nitrogen; a polyester polyol made from formaldehyde via formose; two polymer polyols grafted with acrylonitrile and with acrylonitrile/styrene, respectively; a polyol containing dispersed polyurea; a polytetramethylene ether glycol and a copolyester polyol made from tetrahydrofuran and ethylene; a polyester polyol made from adipic acid, diethylene glycol, and trimethylolpropane; a polyol made from residue in dimethyl terephthalate manufacture; and polybutadiene polyol.
A semicontinuous process and a continuous process are evaluated and compared for the production of a trifunctlonal polyether polyol with a mol. wt of 3,000. The continuous process is competitive with the prevalently used semicontinuous process only If the reaction rate is accelerated by adding a chemical to promote the contact of the potaesium hydroxide catalyst with the reactants. Phosphorus- and halogen-containing polyols are reviewed.