Separation of physically co-mingled plastics using a supercritic

Details Separation of physically co-mingled plastics using a supercritic Separation of physically co-mingled plastics using a supercritic

1991-01-29

1992-06-30

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

210703, 210771, 210808, 209 2, 209 11, 209172, B01D 3518

Patent

active

051260581

ABSTRACT:
The present invention provides a method for selectively separating co-mingled materials of different densities by selective density flotation of the materials in a fluid in the vicinity of its critical point. The extermely high compressibility of a fluid in the vicinity of its critical point allows continuous variations over the maximum density range to be accomplished using minimal changes in temperature and pressure. Materials exhibiting similar densities can thus be separated by adjusting the fluid density to a point between the two materials.

REFERENCES:
patent: 3822015 (1974-07-01), Hsieh et al.
patent: 4111798 (1978-09-01), Peterson et al.
patent: 4379748 (1983-04-01), Hoogendoorn
patent: 4405452 (1983-09-01), Wentzell
patent: 4578184 (1986-03-01), Rasmussen
patent: 4617111 (1986-10-01), Grimm et al.
patent: 4746422 (1988-05-01), Grimm
patent: 4844351 (1989-04-01), Holloway

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