US PATENT SUBCLASS 208 / 315
.~.~.~ With recycle of product of later extraction to earlier extraction stage

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

308  DF  FRACTIONATION {5}
311  DF  .~ Liquid extraction with solvents {11}
314  DF  .~.~ Plural stages with different oil miscible solvents {2}
315.~.~.~ With recycle of product of later extraction to earlier extraction stage

DEFINITION

Classification: 208/315

(under subclass 314) Processes wherein at least one of the extracted fractions of a later extraction step is returned to an earlier extraction step.

SEE OR SEARCH THIS CLASS, SUBCLASS:

318, for extraction processes involving recycle of a fraction thereof which include the use of only one solvent (whether single or plural stage operation).