Separation of toluene diisocyanate from the residues of the prod

Details Separation of toluene diisocyanate from the residues of the prod Separation of toluene diisocyanate from the residues of the prod

1989-01-13

1990-04-17

Siegel, Alan

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

Organic compounds

Isocyanate esters

560347, C07C13700

Patent

active

049182200

ABSTRACT:
Toluene diisocyanate (TDI) is separated and recovered from the residues of the production thereof, e.g., from the tars of phosgenation of an aromatic diamine, by extracting such residues with an extractant which comprises an inert gas, e.g., CO.sub.2, in either the liquid or supercritical state, optionally in the presence of a coextractant diluent, for example an ester, aromatic hydrocarbon or chlorinated aromatic hydrocarbon, or chlorinated aliphatic hydrocarbon.

REFERENCES:
patent: 4372891 (1983-02-01), Hilbert et al.
Chem. Abst. Hyatt, vol. 102 (1985), p. 102:24047h.
Chem. Abst. Winter, vol. 93 (1980), p. 93:152230h.
Journal of Organic Chemistry 1984, 49, 5097-5101, "Liquid and Supercritical Carbon Dioxide as Organic Solvents".

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