Process for the preparation of isocyanates through the thermal c

Details Process for the preparation of isocyanates through the thermal c Process for the preparation of isocyanates through the thermal c

1984-10-25

1985-07-23

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6900

Patent

active

045307962

ABSTRACT:
A process for the pyrolysis of mono-, di-, and polyurethanes to the corresponding mono-, di-, and polyisocyanates wherein the urethane to be cleaved is heated under pressure and sprayed through a nozzle into a pyrolysis chamber maintained at reduced pressure. The isocyanate and alcohol cleavage products are separated by fractional condensation.

REFERENCES:
patent: 4003938 (1977-01-01), Koenig et al.
patent: 4069238 (1978-01-01), Zanker
patent: 4081472 (1978-03-01), Tsumura et al.
patent: 4195031 (1980-03-01), Reichmann et al.

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