Process for isolating polyisocyanate isomers from polyisocyanate

Details Process for isolating polyisocyanate isomers from polyisocyanate Process for isolating polyisocyanate isomers from polyisocyanate

1992-12-30

1994-04-05

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

25218221, 25218222, 560336, 560352, C08G 1870

Patent

active

053006160

ABSTRACT:
Polyisocyanate mixtures are isolated in pure or more concentrated form from isomeric mixtures by liquid-liquid extraction using a two-phase system. The two phases are 1) a non-polar solvent phase and 2) a polar solution in which a hydrogen halide is present. In a preferred embodiment, the extraction is carried out in a countercurrent extractor.

REFERENCES:
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patent: 4499023 (1985-02-01), Mitrowsky et al.
patent: 5043471 (1991-08-01), Hammen et al.
Chemical Abstracts, vol. 89, No. 13, Sep. 25, 1978, Abstract No. 108362w.
Chemical Abstracts, vol. 70, No. 1, Jan. 6, 1969, Abstract No. 3390h.
A. S. Shevlyakov et al., Sin. Fiz.-Khim. Polim., 5, 66 (1968).
CA 70, 3390h 1992.

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