US PATENT SUBCLASS 208 / 67
.~.~ First stage is thermal or catalytic cracking

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
49  DF  .~ Plural serial stages of chemical conversion {6}
67.~.~ First stage is thermal or catalytic cracking {4}
68  DF  .~.~.~> With subsequent hydrocracking
69  DF  .~.~.~> With subsequent reforming {1}
71  DF  .~.~.~> With subsequent polymerization
72  DF  .~.~.~> Cracking in all stages {4}

DEFINITION

Classification: 208/67

(under subclass 49) Processes wherein the mineral oil is subjected to a thermal of a catalytic cracking reaction prior to any other conversion step.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50+, for those plural serial stage conversion reactions including at least one step of cracking which results in the formation product coke.

58+, for processes of subjecting a mineral oil to plural successive steps of conversion, the first of which is cracking in the presence of added hydrogen.