US PATENT SUBCLASS 208 / 76
.~.~.~.~ With cracking of the first stage bottoms

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  DF  .~.~ First stage is thermal or catalytic cracking {4}
72  DF  .~.~.~ Cracking in all stages {4}
76.~.~.~.~ With cracking of the first stage bottoms

DEFINITION

Classification: 208/76

(under subclass 72) Processes wherein the product of the initial cracking stage includes a plurality of separate fractions having different boiling ranges and in which the nonvolatilized or residual fraction is subjected to another cracking operation (all stages noncatalytic).