US PATENT SUBCLASS 208 / 330
.~.~.~ Nitrogen-containing solvent

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}
322  DF  .~.~ Organic solvent containing {8}
330.~.~.~ Nitrogen-containing solvent {1}
331  DF  .~.~.~.~> Amino compound

DEFINITION

Classification: 208/330

(under subclass 322) Processes wherein a nitrogen containing organic compound is employed as a solvent.

(1) Note. This subclass contains, for example, extraction processes using nitro compounds or nitriles.