US PATENT SUBCLASS 208 / 46
CHEMICAL CONVERSION OF HYDROCARBONS

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

46CHEMICAL CONVERSION OF HYDROCARBONS {11}
47  DF  .~> With prevention of corrosion or erosion in system
48 R  DF  .~> With prevention or removal of deleterious carbon accumulations or equipment {2}
49  DF  .~> Plural serial stages of chemical conversion {6}
78  DF  .~> Plural parallel stages of chemical conversion {2}
81  DF  .~> With contacting vapor porducts with liquid feed (i.e., product scrubbing and feed stripping) {3}
85  DF  .~> With preliminary treatment of feed {4}
95  DF  .~> With subsequent treatment of products {3}
106  DF  .~> Cracking {5}
133  DF  .~> Reforming (includes dehydrogenation, isomerization, cyclization, aromatization, alkylation, dealkylation reactions) {1}
142  DF  .~> Hydrogenation (saturation) {1}
146  DF  .~> Solids contacting and mixing {8}

DEFINITION

Classification: 208/46

(under the class definition) Processes of treating mineral oils which result in a chemical alteration of at least some of the hydrocarbon molecules thereof forming mineral oils having different properties, or which result in the formation of coke.

(1) Note. This and indented subclasses include chemical treatments of the mineral oil as cracking (forming shorter chain hydrocarbon, light fractions), hydrogenation (saturation of double bonds) polymerization (forming longer chain hydrocarbon molecules) reforming (isomerization of the hydrocarbon molecules, etc.) and decomposing at least a part of the oil to coke.

(2) Note. Within this and indented subclasses 47 to 105 include combinations there provided for, whether the conversion is claimed broadly or specifically. Conversion processes which involve contacting mineral oil with a solid are classified in the subclass providing for the particular conversion when the mineral oil to be converted or the solid material (catalyst or inerts) is specifically identified. Such processes in which neither the oil to be converted or the solid material contacted therewith are specifically identified, even though the conversion be named, e.g., cracking, are included in subclass 146. Cross references of patents classified in other subclasses which disclose or claim any significant solids-oil contacting procedure are placed in subclass 146.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27, for processes of treatment or recovery of paraffin wax including a mineral oil conversion.

40, for processes of making asphalt, tar, pitch or resins including a conversion of mineral oil. 44, for processes of chemical modification of asphalt tar, pitch or resin.

SEE OR SEARCH CLASS

48, Gas: Heating and Illuminating, appropriate subclass for the conversion of a mineral oil to a gas; processes which result in the production of a mineral oil and a gas are classified in this class (208) unless the production of the mineral oil is only incidental to the process.

201, Distillation: Processes, Thermolytic, appropriate subclasses, for a process of thermolytic distillation of solid hydrocarbon containing material to produce coke, whether or not volatiles are recovered.

204, Chemistry: Electrical and Wave Energy,

172, for electrostatic or electrical discharge cracking processes, other than those in which the chemical conversions are caused by merely thermal effects which are in this class (208).

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, especially

190+, and 211+ for apparatus for treating a material (including mineral oil) with a catalyst.

585, Chemistry of Hydrocarbon Compounds, appropriate subclasses for processes of forming definite identifiable carbon compounds from a mineral oil; however, the formation of a definite compound as an intermediate in a mineral oil

treating process, such as a condensation process wherein a paraffin wax is chlorinated and subsequently dechlorinated or dehydrochlorinated to produce another mineral oil, is classified in this class (208).