US PATENT SUBCLASS 208 / 311
.~ Liquid extraction with solvents

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

308  DF  FRACTIONATION {5}
311.~ Liquid extraction with solvents {11}
312  DF  .~.~> With blending of separated fractions with each other or with feed
313  DF  .~.~> Extractive distillation
314  DF  .~.~> Plural stages with different oil miscible solvents {2}
317  DF  .~.~> Counter current multistage extraction
318  DF  .~.~> With recycle of oil
319  DF  .~.~> With pressure variation
320  DF  .~.~> With temperature gradient in extraction zone or between extraction zones
321  DF  .~.~> With solvent rehabilitation
322  DF  .~.~> Organic solvent containing {8}
338  DF  .~.~> Liquid sulfur dioxide
339  DF  .~.~> Liquid-liquid contacting

DEFINITION

Classification: 208/311

(under subclass 308) Processes in which mineral oil is mixed with or contacted with another liquid which will dissolve or is miscible with a portion or fraction of the oil forming a solution or liquid phase which is immiscible with another oil fraction not so dissolved.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8+, for processes of extracting mineral oil from solid natural sources.

31, and 33+, for processes of recovery or treatment of paraffin wax involving solvent extracting.

45, for processes of recovery of asphalt, tar, pitch or resin by solvent extraction.

87, for processes of solvent extracting mineral oil combined with conversion of the extracted oil.

96, for processes of converting mineral oil combined with solvent extracting the converted oil. SEE OR SEARCH CLASS

196, Mineral Oils: Apparatus,

14.52, for apparatus specialized for the solvent extraction

of mineral oils.

210, Liquid Purification or Separation, for processes of separating liquids not otherwise provided for.

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,

255+, for extracting, leaching, or dissolving apparatus not otherwise provided for.

423, Chemistry of Inorganic Compounds, appropriate subclasses for processes directed to extracting, leaching or dissolving therein provided for and

658.5, (Class 423) for extracting, leaching or dissolving processes not otherwise provided for.

554, Organic Compounds,

9, 16 for processes of extraction for recovering fatty oil compounds.

585, Chemistry of Hydrocarbon Compounds, 833+, for processes of recovering particular hydrocarbons by solvent extraction.