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

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

1980-12-22

1981-12-01

Breitenstein, G. T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C125073

Patent

active

043037941

ABSTRACT:
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.

REFERENCES:
patent: T994004 (1980-05-01), Shawl
patent: 2517965 (1950-08-01), Bohl
patent: 2527240 (1954-10-01), Baird
patent: 2946768 (1960-07-01), Klauke et al.
patent: 4162362 (1979-07-01), Shawl
patent: 4163019 (1979-07-01), Mango
patent: 4172948 (1979-10-01), Shawl
patent: 4243815 (1981-01-01), Werger

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