Method for recovery of methyl methacrylate from mixed polymeric

Details Method for recovery of methyl methacrylate from mixed polymeric Method for recovery of methyl methacrylate from mixed polymeric

1974-11-04

1976-06-22

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6954

Patent

active

039651495

ABSTRACT:
A method for recovering methyl methacrylate from a mixture of polymeric materials containing poly (methyl methacrylate) which comprises contacting the mixture with a boiling C.sub.5 - C.sub.8 alkane, separating an insoluble residue containing poly (methyl methacrylate) from the alkane and its extract, extracting poly (methyl methacrylate) from such insoluble residue with boiling acetone, separating the poly (methyl methacrylate) from the acetone, and recovering the methyl methacrylate monomer from such poly (methyl methacrylate) by pyrolysis. In a preferred embodiment, the poly (methyl methacrylate) containing solid obtained after the acetone extraction is compressed under elevated temperatures and pressures prior to pyrolysis. The method can be stopped prior to the pyrolysis step when it is desired to recover only the poly (methyl methacrylate).

REFERENCES:
patent: 2030901 (1936-02-01), Strain
patent: 2341282 (1944-02-01), Marks
patent: 2377952 (1945-06-01), Marks

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