US PATENT SUBCLASS 208 / 77
.~.~.~.~ With cracking of the first stage intermediate fraction


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}
77.~.~.~.~ With cracking of the first stage intermediate fraction


DEFINITION

Classification: 208/77

(under subclass 72) Processes wherein the product of the initial cracking stage includes a plurality of separate

fractions having different boiling ranges, and includes at least one fraction intermediate the lowest boiling fraction and the nonvolatilized or residual fraction and at least one of said intermediate fractions is subjected to another cracking operation.