Circulation process for the production of aliphatic and cycloali

Details Circulation process for the production of aliphatic and cycloali Circulation process for the production of aliphatic and cycloali

1991-05-28

1992-02-11

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

560344, C07C26300

Patent

active

050877399

ABSTRACT:
A circulation process for the production of (cyclo)aliphatic diisocyanates, in which the biscarbamate is produced from diamines, by-products from the thermal cracking, urea, and alcohol in the presence of N-unsubstituted carbamates and dialkyl carbonates, and with separation of NH.sub.3 ; the subsequent cracking of the biscarbamate is carried out in the liquid phase without solvent; the diisocyanate and alcohol are condensed; the diisocyanate is subjected to a purifying distillation; and a portion of the cracking reaction mixture is discharged with the by-products formed and recycled to the biscarbamate production step after prior reaction with the crude alcohol formed, effectively utilizes the by-products formed in the cracking step and is an industrially practical and economical process.

REFERENCES:
patent: 4388246 (1983-06-01), Sundermann et al.
patent: 4596679 (1986-06-01), Hellbach et al.

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