US PATENT SUBCLASS 208 / 226
.~.~ With alkali or alkali earth metal compound (except clays)

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

177  DF  REFINING {23}
208 R  DF  .~ Sulfur removal (free or combined sulfur) {17}
226.~.~ With alkali or alkali earth metal compound (except clays) {4}
227  DF  .~.~.~> Plural stages of sulfur removal
228  DF  .~.~.~> With preliminary treatment of feed
229  DF  .~.~.~> With subsequent treatment of product
230  DF  .~.~.~> Alkali metal compound {2}

DEFINITION

Classification: 208/226

(under subclass 208) Processes wherein mineral oil is desulfurized by the use of an alkali or alkaline earth metal compound.

(1) Note. For the purpose of this classification, the alkali metals are sodium, potassium, lithium, rubidium, cesium and francium and the alkaline earth metals are calcium, barium, and strontium and also including magnesium.

(2) Note. Natural clays which generally contain some alkali metal component are not included in this or indented subclasses but are classified instead with the aluminum or silicon containing compounds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

203+, for processes of sweetening mineral oils with alkali metal hydroxides or carbonates.

258, and 259, for processes of removing gums or gum formers from mineral oils with free alkali metals and alkali and alkaline earth metal compounds, respectively.

283+, for other processes for refining of mineral oils with alkali or alkaline earth metal compounds.