US PATENT SUBCLASS 208 / 189
.~ Sweetening

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

177  DF  REFINING {23}
189.~ Sweetening {6}
190  DF  .~.~> With hypochlorites
191  DF  .~.~> With copper compounds {3}
196  DF  .~.~> With peroxides
197  DF  .~.~> With lead compounds {2}
203  DF  .~.~> With alkali metal hydroxide or carbonate {2}
207  DF  .~.~> Nitrogen containing compound

DEFINITION

Classification: 208/189

(under subclass 177) Processes wherein a mineral oil is treated to convert mercaptans contained therein to disulfides.

(1) Note. These processes are known as "Sweetening" treatments and result in an improvement of the color and odor of the mineral oil. Sweetening generally involves an oxidation treatment and the less noxious form of sulfur (disulfides) may or may not be removed from the mineral oil.

(2) Note. Sweetening processes are classified herein even though carried out in the presence of an anti-oxidant. This process is known as "inhibitor sweetening". If the resulting sweetened oil is claimed and the inhibitor is not a mineral oil, the patent is classified as original in the appropriate composition class, e.g., those listed in the Search Notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

208+, for processes of removing sulfur and sulfur containing compounds from mineral oil which do not involve the formation of the disulfide.

SEE OR SEARCH CLASS

44, Fuel and Related Compositions, 300+, for mineral oil fuels including nonhydrocarbon additives (see (2) Note).

252, Compositions,

182.11+, particularly subclasses 185 and 189+ for reagents employed in sweetening operations classified herein (in Class 208) (see (2) Note).

508, Solid Antifriction Devices, Materials Therefor, Lubricant or Separant Compositions for Moving Solid Surfaces, and Miscellaneous Mineral Oil Compositions, particularly

110+, for mineral oil lubricating compositions including nonhydrocarbon additives.

585, Chemistry of Hydrocarbon Compounds,

1+, for all-hydrocarbon compositions containing a nonmineral oil component.