Polymer recovery from solution

Details Polymer recovery from solution Polymer recovery from solution

1986-10-01

1990-03-20

Manoharan, Virginia

Concentrating evaporators

Processes

134 10, 134 12, 159 22, 159DIG10, 159DIG16, 202175, 202205, 202265, 203 4, 203 88, 203 91, 203 95, 528499, 528501, 528502, B01D 100

Patent

active

049098985

ABSTRACT:
A process for removing substantial quantities of volatile liquid e.g. hydrocarbon from a mixture of polymer and such liquid is provided. This process includes the initial step of introducing the mixture, and a liquid which is immiscible with the polymer, into a mixing/kneading zone provided with heated heat transfer surfaces having a temperature higher than the boiling point of the lowest boiling liquid component in the mixing/kneading zone. The mixture and the immiscible liquid are subjected to a period of continuous mixing and kneading within the mixing/kneading zone, to bring the mixture into continuously moving contact with the heat transfer surfaces. During this period of continuous mixing/kneading, the heated heat transfer surfaces are repeatedly mechanically cleaned to prevent buildup of solid polymer thereon. Volatilized liquid is vented from the mixing/kneading zone during the period of continuous mixing and kneading, and the polymer and residual liquid is subsequently discharged from the mixing/kneading zone.

REFERENCES:
patent: 2719325 (1955-10-01), Franklin
patent: 2833750 (1958-05-01), Vickers
patent: 2992679 (1961-07-01), Twaddle
patent: 3395746 (1968-08-01), Szako et al.
patent: 3457248 (1969-11-01), Kahre
patent: 3799234 (1974-03-01), Skidmore
patent: 3956060 (1976-05-01), Scoggin
patent: 4094942 (1978-06-01), Nakai et al.
patent: 4198265 (1980-04-01), Johnson
patent: 4400236 (1983-08-01), Hanamura et al.

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