US PATENT SUBCLASS 585 / 836
.~.~ Different, sequentially used agents

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
833  DF  .~ By addition of extraneous agent, e.g., solvent, etc. {15}
836.~.~ Different, sequentially used agents {3}
837  DF  .~.~.~> One agent is a diluent, i.e., nonselective solvent or heat exchange material
838  DF  .~.~.~> Resolution of feed into more than two different components
839  DF  .~.~.~> Later agent disengages earlier, e.g., decomplexing agent, etc. {1}

DEFINITION

Classification: 585/836

Different, sequentially used agents:

(under subclass 933) Subject matter wherein a plurality of different agents are added one after the other to all or part of the feedstock.

(1) Note. "Different" is intended to mean chemically different materials and not a single material in different stages of contamination or dilution with hydrocarbon as would be formed during concurrent extraction.