Method of concentrating a solution of methylene diphenyl diisocy

Details Method of concentrating a solution of methylene diphenyl diisocy Method of concentrating a solution of methylene diphenyl diisocy

1981-12-24

1982-11-23

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453P, 260453AM, C07C119048

Patent

active

043604765

ABSTRACT:
A method of concentrating a solution of methylene diphenyl diisocyanate in diphenyl oxide, which includes cooling the solution until part of the solution crystallizes, thereby forming a solid phase having a lower concentration of the methylene diphenyl diisocyanate, and a liquid phase having a higher concentration of the methylene diphenyl diisocyanate than in the original solution, and then separating the solid and liquid phases. The method is particularly applicable to the concentration of solutions of 4,4'-methylene diphenyl diisocyanate in diphenyl oxide.

REFERENCES:
patent: 1899257 (1933-02-01), Britton et al.
patent: 2552523 (1951-05-01), Cunningham
patent: 2617274 (1952-11-01), Schmidt
patent: 3054819 (1962-09-01), Barclay, Jr. et al.
patent: 3591617 (1971-07-01), Buchsbaum

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