US PATENT SUBCLASS 208 / 49
.~ Plural serial stages of chemical conversion

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
49.~ Plural serial stages of chemical conversion {6}
50  DF  .~.~> Coking in at least one stage {3}
56  DF  .~.~> Hydrogen donor diluent cyclic processes
57  DF  .~.~> First stage is an hydrogenation (saturation)
58  DF  .~.~> First stage is hydrocracking (includes hydro-desulfurization under cracking conditions) {3}
62  DF  .~.~> First stage is reforming {2}
67  DF  .~.~> First stage is thermal or catalytic cracking {4}

DEFINITION

Classification: 208/49

(under subclass 46) Processes in which a mineral oil is subjected to two or more successive distinct chemical conversions.

(1) Note. Processes classified herein include, for example, those in which the total product of the first conversion is subjected to a second conversion or those in which only a fraction of the product of the first conversion is subjected to further conversion.

(2) Note. Processes of treating a mineral oil to plural, successive conversions are included herein, even though one of the conversions is a reaction, per se, classifiable in Class 585, Chemistry of Hydrocarbon Compounds, etc., e.g., conversion of a mineral oil fraction to a definite compound (ethylene, butene, etc.), providing there is produced a converted mineral oil product. In such combination processes, including steps classifiable in Class 260, are classified in the subclass including the corresponding type of process (e.g., polymerization, hydrogenation, etc.). Combinations including dehydrogenation, isomerization, cyclization, aromatization, alkylation or dealkylation reactions are classified in the subclass providing for combinations including reforming.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78+, for processes including plural distinct conversions applied to separate mineral oils or mineral oil fractions which are either (1) fractions from a single mineral oil source or (2) are subsequently blended or mixed.

SEE OR SEARCH CLASS

260, Chemistry of Carbon Compounds, (see (2) Note). 585, Chemistry of Hydrocarbon Compounds, etc. (see (2) Note).