US PATENT SUBCLASS 208 / 88
.~.~ Refining

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
85  DF  .~ With preliminary treatment of feed {4}
88.~.~ Refining {3}
89  DF  .~.~.~> With hydrogen
90  DF  .~.~.~> With acids
91  DF  .~.~.~> With solid absorbents

DEFINITION

Classification: 208/88

(under subclass 85) Processes wherein the preliminary treatment of the mineral oil includes the removal of nonhydrocarbon impurities or the conversion of the impurity to an inactive form.

(1) Note. Many of the patents classified herein involve the removal of or the inactivation of impurities which would tend to inactivate or reduce the activity of (poison) the catalyst employed in a subsequent conversion process.

SEE OR SEARCH THIS CLASS, SUBCLASS:

87, for preliminary removal of impurities by means of solvent extraction.

177+, for processes for the removal of or inactivation of nonhydrocan impurities occurring in mineral oil.