Process for recovery of toluene diisocyanate

Details Process for recovery of toluene diisocyanate Process for recovery of toluene diisocyanate

1978-06-23

1980-08-05

Turk, Arnold

Distillation: processes, separatory

Vaporization zone under positive pressure or vacuum

159 6W, 159DIG10, 260453SP, B01D 124

Patent

active

042160634

ABSTRACT:
A process for the continuous and automatic separation of toluene diisocyanate, without decomposition, from distillation residues comprising evaporating toluene diisocyanate in an agitated, scraped evaporator, under a vacuum of about 1 mm Hg to about 50 mm Hg and at a temperature of about 210.degree. C. to about 250.degree. C., with a minimum residence time, preferably about 15 minutes, in an evaporator, and continuously extracting the remaining components of the residue.

REFERENCES:
patent: 2706169 (1955-04-01), Beck
patent: 2974725 (1961-03-01), Samesreuther et al.
patent: 3457291 (1969-07-01), Baylor
patent: 3542112 (1970-11-01), Monty
Kontro Co., "Thin-Film Evaporator Can Produce Dry Powders"; Chemical Engineering; Dec. 23, 1963; pp. 52-53.

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