Method for enhancing catalytic activity
AssigneeMobil Oil Corporation
InventorsFritz A. Smith, Samuel A. Tabak
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Abstract
A hydrocarbon feed for use in a catalytic conversion process that utilizes a zeolite catalyst, and that contains a catalytically deleterious impurity, is refined by contact with a zeolitic sorbent. The invention is applicable to dewaxing, with an example illustrating reduction by 100.degree. F. of the initial equilibrium (lineout) temperature by the method of this invention. Other reactions include conversions of aromatic hydrocarbons such as alkylation, isomerization and disproportionation.
Claims18
A process for dewaxing a hydrocarbon oil that contains a catalytically deleterious impurity, which process comprises:
- treating said hydrocarbon oil with a sorbent consisting of a first molecular sieve zeolite having pores with an effective diameter of at least about 5 Angstroms, said treatment being under sorption conditions effective to remove at least some of said impurity;
- and dewaxing said treated oil by contact under dewaxing conditions with a dewaxing catalyst consisting of a second molecular sieve zeolite having pores with an effective diameter of at least about 5 Angstroms, and equal to or smaller than the effective diameter of the pores of said first molecular sieve zeolite.
A method for refining a hydrocarbon feed prior to catalytic conversion at a temperature of 400.degree.-1000.degree. F. with a catalyst comprising a crystalline zeolite having a Constraint Index of 1 to 12, and a dried crystal density in the hydrogen form of not less than 1.6 grams per cubic centimeter, said hydrocarbon feed being selected from the group consisting of a waxy hydrocarbon oil and an aromatic hydrocarbon selected from the group consisting of benzene, toluene, xylenes, and mixtures thereof, which method comprises contacting said feed under sorption conditions including a temperature less than about 350.degree. F. with a sorbent consisting of a crystalline zeolite having a Constraint Index of 1 to 12, and a dried crystal density in the hydrogen form of not less than 1.6 grams per cubic centimeter, and recovering a refined hydrocarbon feed.
Dependencies are inferred from the claim text.