US PATENT SUBCLASS 208 / 81
.~ With contacting vapor porducts with liquid feed (i.e., product scrubbing and feed stripping)

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
81.~ With contacting vapor porducts with liquid feed (i.e., product scrubbing and feed stripping) {3}
82  DF  .~.~> Only selected fractions of product or feed are contacted
83  DF  .~.~> With subsequent fractionation
84  DF  .~.~> With added material (to scrubbing-stripping stage)

DEFINITION

Classification: 208/81

(under subclass 46) Processes wherein a conversion operation is combined with the contaction of the mineral oil to be converted with a vapor product of the conversion operation prior to the conversion step (prior to entering the conversion zone) and in which the higher boiling components of the vapor product are absorbed by the mineral oil, and the more volatile products of the mineral oil feed are volatilized and stripped therefrom.

(1) Note. The processes classified herein generally involve the stripping of the liquid feed with vapor products of the conversion stage prior to the feed entering the conversion zone. The liquid feed in turn scrubs the vapor products of undesirable products. The contacting must take place outside the actual conversion zone even if occurring in the same chamber. In any event, the contaction for mixing or fractionation purposes must precede the actual conversion step.