Process for isolating polyisocyanate isomers from...

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

C - Chemistry, Metallurgy

07

C

C07C 265/14 (2006.01) C07C 263/20 (2006.01) C07C 269/08 (2006.01) C07C 271/04 (2006.01)

Patent

CA 2086651

Mo3826 LeA 28,705 PROCESS FOR ISOLATING POLYISOCYANATE ISOMERS FROM POLYISOCYANATE MIXTURES ABSTRACT OF THE DISCLOSURE 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. Le A 28 705-Foreign Countries

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