Separation and recovery of 4,4'-methylene dimethyl...

Details Separation and recovery of 4,4'-methylene dimethyl... Separation and recovery of 4,4'-methylene dimethyl...

C - Chemistry, Metallurgy

07

C

260/496

C07C 271/06 (2006.01)

Patent

CA 1168261

ABSTRACT OF THE DISCLOSURE A method of separating 4,4'-methylene dimethyl diphenyldicarbamate from its 2,4' and 2,2'-isomers, from methyl phenylcarbamate, from higher phenylcarbamate derivatives, and from related compounds. The mixture is washed with methanol, thereby forming a liquid phase comprising a methanol solution of predominantly 2,4'-isomer, 2,2'-isomer, diphenyldicarbamate, methyl phenylcarbamate, and higher phenylcarbamate derivatives; and a solid phase of substantially 4,4'-methylene dimethyl diphenyldicarbamate. The 2,4'-isomer and 2,2'- -isomer may also be separated by using a methanol-water solution wash. 28,183-F

391948

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