US PATENT SUBCLASS 208 / 270
.~.~.~ Plural stages of acid treatment

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

177  DF  REFINING {23}
265  DF  .~ With acids {4}
266  DF  .~.~ Sulfuric acid {7}
270.~.~.~ Plural stages of acid treatment

DEFINITION

Classification: 208/270

(under subclass 266) Processes wherein mineral oil is subjected to a plurality of distinct refining treatments with acid, sulfuric acid being employed in at least one of the treatments.

SEE OR SEARCH THIS CLASS, SUBCLASS:

220, for processes including plural stages of desulfurization, at least one of the treatments being with an acid.