Process for splitting polycarbonates

Details Process for splitting polycarbonates Process for splitting polycarbonates

1994-04-04

1995-08-08

Ramsuer, Robert W.

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

Organic compounds

Carbonate esters

203DIG6, C07C 6806

Patent

active

054400660

ABSTRACT:
A continuous process for splitting an aromatic polycarbonate resin is disclosed. Accordingly there are reacted in a distillation column and in the presence of a catalyst
(i) a polycarbonate resin in solution with
(ii) methanol
to produce a dihydroxy compound and dimethyl carbonate. The solution which contains polycarbonate and monohydroxy compound solvent exclusive of methanol is fed into the upper section of said column and the methanol is fed into the lower section of the column. The methanol is fed in the form of a mixture containing methanol and about 1-50 weight percent of dimethyl carbonate. The dimethyl carbonate thus produced is removed from an upper section of the column and the dihydroxy compound is removed from a lower section of the column.

REFERENCES:
patent: 5210268 (1993-05-01), Fukuoka et al.
patent: 5266716 (1993-11-01), Buysch et al.

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