US PATENT SUBCLASS 208 / 90
.~.~.~ With acids

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
85  DF  .~ With preliminary treatment of feed {4}
88  DF  .~.~ Refining {3}
90.~.~.~ With acids

DEFINITION

Classification: 208/90

(under subclass 88) Processes wherein the refining treatment includes the use of a free acid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+, 252 and 265+, for refining processes wherein an acid is used.