US PATENT SUBCLASS 208 / 317
.~.~ Counter current multistage extraction

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

308  DF  FRACTIONATION {5}
311  DF  .~ Liquid extraction with solvents {11}
317.~.~ Counter current multistage extraction

DEFINITION

Classification: 208/317

(under subclass 311) Processes wherein mineral oil is subjected to extraction in a plurality of stages the oil and the solvent employed flowing from stage to stage in opposite directions.