Method of and apparatus for the recovery of a desired material f

Details Method of and apparatus for the recovery of a desired material f Method of and apparatus for the recovery of a desired material f

1975-11-25

1977-11-01

Bascomb, Jr., Wilbur L.

Gas separation

Means within gas stream for conducting concentrate to collector

55 74, 208262, B01D 5106

Patent

active

040563693

ABSTRACT:
A process and apparatus for recovering gasoline or other solvents from solvent laden air is disclosed. The solvent laden air is contacted at ambient pressure and temperature in a vessel with a mixture of an adsorbent for the desired material, e.g., activated charcoal, and an inert compound possessing a high heat capacity, e.g., aluminum oxide. After the adsorbent is essentially saturated with the solvent, flow of solvent laden air into the vessel is terminated. The mixture of materials in the vessel is then heated by indirect heat exchange (e.g., steam coils buried in the mixture) to a temperature below the vaporization temperature of the solvent thereby indirectly treating the solvent adsorbed on the material. A pump is then operated to draw the air from the vessel at a rate that reduces the pressure in the vessel sufficiently to vaporize the solvent. Thus, substantially all of the solvent is drawn out of the vessel with the air. Afterward, the vessel is cooled to ambient temperature and the process can be repeated. The solvent in the air that is drawn off from the vessel may be recovered by subsequent treatment. A plurality of vessels may be utilized to effect continuous treatment of the solvent laden air.

REFERENCES:
patent: 1661149 (1928-02-01), Barnebey
patent: 3309844 (1967-03-01), Hemstreet et al.
patent: 3768232 (1973-10-01), Farber et al.
patent: 3867111 (1975-02-01), Knowles
patent: 3874427 (1975-04-01), Tiggelbeck

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