US PATENT SUBCLASS 208 / 56
.~.~ Hydrogen donor diluent cyclic processes

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}
56.~.~ Hydrogen donor diluent cyclic processes

DEFINITION

Classification: 208/56

(under subclass 49) Processes wherein one component or product of a conversion step is subjected to hydrogenation and then returned or recycled to the process as a source of hydrogen (a "hydrogen donor").