Method for removing tar from crude tolylene diisocyanate

Details Method for removing tar from crude tolylene diisocyanate Method for removing tar from crude tolylene diisocyanate

1977-07-13

1979-02-06

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

203 88, B01D 306, C07C119048

Patent

active

041384245

ABSTRACT:
A method for removing tar from crude tolylene diisocyanate comprises quantitatively feeding a starting solution consisting of crude tolylene diisocyanate containing tar or its mixture with an inert organic solvent into the inlet of an elongated heating tube, thereby producing annular shape stream or spray stream of the starting solution in the region on the outlet of the heating tube, spouting the starting solution in this state from the outlet of the heating tube into a separation chamber kept at reduced pressure and thereby recovering tar in the form of nonviscous and porous masses from the starting solution.

REFERENCES:
patent: 3169141 (1965-02-01), Kober et al.
patent: 3405040 (1968-10-01), Ewald
patent: 3457291 (1969-07-01), Baylor

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