Paraffin hydrocarbon shape selective isomerization catalyst, preparation method and application thereof

Abstract

The invention discloses a paraffin hydrocarbon shape selective isomerization catalyst, a preparation method and application thereof. The catalyst comprises a rare earth-modified molecular sieve and a halogen-modified inorganic melting-resisting oxide and at least one VIII-family precious metal, wherein the molecular sieve is a TON type molecular sieve, the weight ratio of the rare earth-modified molecular sieve to the halogen-modified inorganic melting-resisting oxide is 10:90-90:10, in the catalyst, the content of the VIII-family precious metal is 0.1-10 percent by weight, in the rare earth-modified molecular sieve, the mass content of the rare earth oxide is 0.5-60.0 percent, and in the halogen-modified inorganic melting-resisting oxide, the mass content of the halogen is 0.1-20.0 percent. Compared with the prior art, the catalyst is especially suitable for a hydroprocessing process of lubricating oil distillate, and has the characteristics of high yield of a target product, low flow point and high viscosity index.

Description

technical field [0001] The invention relates to a paraffin hydrocarbon shape-selective isomerization catalyst and its preparation method and application. Specifically, it relates to a waxy raw material oil isomerization dewaxing catalyst and its preparation method and application, especially suitable for the hydroisomerization dewaxing process of lubricating oil. Background technique [0002] The waxy feed oil mentioned in the present invention mainly includes diesel oil, AGO, VGO, white oil, hydrocracking tail oil and lubricating oil fractions, etc. Waxy raw oils, especially heavy distillate oils derived from paraffin-based crude oils, contain more waxes, have higher freezing points, and poor low-temperature fluidity. During storage, transportation, and use, the oil will Thickening, even solidification, thereby blocking the oil pipeline and interrupting the oil supply to the engine to cause engine failure. At present, there are many methods to solve various problems cause...

AI Technical Summary

Problems solved by technology

Although the above-mentioned materials have acid centers with moderate strength and pore structures that match wax molecules, and have obvious space restrictions on multi-branched isomers, they can all cause isomerization reactions of paraffins to a certain extent, but due to In the process of catalyst preparation, most of the acidic centers will be covered, and the obtained catalyst is weak in acidity, low in activity and selectivity. In addition, the stability of the catalyst is closely related to its acidity, and the catalyst with strong acidity is resistant to sulfur and nitrogen poisoning. Strong ability and good stability, but it is also more prone to side reactions such as cracking

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