Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1997-01-03
1998-11-03
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528499, 528501, 528502, 528503, C08G 6400
Patent
active
058309772
ABSTRACT:
The present invention provides a process for the isolation of partially crystalline polycarbonate powder or oligocarbonate powder from solutions thereof, in which process the organic solvent of a polycarbonate solution is vaporized in a heat exchanger, optionally with incorporation of steam, or in a holding tube with incorporation of steam and the pasty mixture of concentrated solution, solvent vapor and optionally water is separated in a separator. In this process, the solvent vapor is condensed in a heat exchanger downstream from the separator. The solvent is vaporized in the heat exchanger by indirect input of heat through the heat exchanger walls and vaporization may be promoted by preheating the polycarbonate or oligocarbonate solution in an upstream heat exchanger or by introducing steam or both.
REFERENCES:
patent: 3508339 (1970-04-01), Neblett
patent: 4212967 (1980-07-01), Goyoni et al.
patent: 4568418 (1986-02-01), Walko et al.
Casper Clemens
Kohlgruber Klemens
Kuhling Steffen
Obermann Hugo
Wulff Claus
Bayer Aktiengesellschaft
Mosley Terressa
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