Solvent extraction and recovery

Details Solvent extraction and recovery Solvent extraction and recovery

2008-12-09

2011-11-01

Drodge, Joseph (Department: 1778)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C165S004000, C210S774000, C554S008000, C554S011000

Reexamination Certificate

active

08048304

ABSTRACT:
Systems and methods for improving dense gas solvent extraction of a solute and recovery of the solvent are provided. A pressure of the solvent/solute mixture obtained from an extraction chamber is increased, e.g. with a pump, thereby providing the mixture above saturation conditions. The increased pressure provides greater solubility of the solute and less solvent being vaporized in a heat exchanger. A buildup of solute in the system is reduced, thus improving system longevity. Also, process conditions of the separation process are isolated from those of the extraction process. Accordingly, the process conditions for the separating process are maintained while the process conditions of the extraction chamber vary with ambient temperature, thus saving cost and energy. This isolation also provides an ability to use, in the gas recovery cycle, a heat pump that can be used for many applications and environmental conditions while still using a conventional refrigerant.

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