Method for continuous hydrolysis of polyurethane foam in restric

Details Method for continuous hydrolysis of polyurethane foam in restric Method for continuous hydrolysis of polyurethane foam in restric

1972-12-18

1977-05-24

Roberts, Elbert L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260582, C07C 8728

Patent

active

040255590

ABSTRACT:
A continuous method for converting particulate polyurethane foam to diamines and liquid polymeric hydrolysis product of the polyurethane (polyethers or polyesters) and simultaneously separating diamines from the liquid polymeric product comprises propelling a stream of particulate polyurethane foam into a first end of an enclosed tubular reaction zone, introducing steam into said first end of said tubular reaction zone under sufficient pressure to pass through said tubular reaction zone and exit from the opposite end thereof into an enclosed separation zone of greater cross sectional area than said tubular reaction zone while carrying with it the liquid and gaseous hydrolysis products of the particulate polyurethane, recovering liquid hydrolysate from the lower half of the enclosed separation zone, and recovering gaseous effluent from the upper half of the enclosed separation zone, said particulate polyurethane in passing from the first end of said tubular reaction zone toward the opposite end thereof being obstructed by two or more grids with apertures of cross sectional area which vary inversely with their distance from said first end of said tubular reaction zone.

REFERENCES:
patent: 3225094 (1965-12-01), Wolf
patent: 3499035 (1970-03-01), Kober et al.

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