Melt crystallization process for preparing high...

Details Melt crystallization process for preparing high... Melt crystallization process for preparing high...

C - Chemistry, Metallurgy

07

C

260/456.4

C07C 263/00 (2006.01) C07C 263/20 (2006.01) C07C 265/14 (2006.01) C08G 18/75 (2006.01)

Patent

CA 2039544

Mo3399CIP PU-374-CIP MELT CRYSTALLIZATlON PROCESS FOR PREPARING HIGH TRANS,TRANS-ISOMER CONTAINING 4,4'-DIISOCYANATO DICYCLOHEXYLMETHANE ABSTRACT OF THE DISCLOSURE The present invention is directed for preparing a 4,4'-di- isocyanato dicyclohexylmethane which contain a relatively high amount of the trans,trans-isomer. The process broadly comprises (a) melting a mixture of 4,4'-diisocyanato dicyclohexyl- methane isomers, (b) cooling the melted mixture to form: (1) a liquid phase and (2) a solid phase , (c) removing said liquid phase, which is a commercially viable product itself, (d) heating the solid phase and removing that portion of the solid phase which has melted, and (e) recovering that portion of said solid phase which has not melted by heating the remaining portion. Mo3399CIP

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