Regeneration method for isodewaxing catalyst

Abstract

The invention relates to a regeneration method for an isodewaxing catalyst. The isodewaxing catalyst is a precious metal / molecular sieve catalyst. The regeneration method is characterized by comprising the following steps: placing a deactivated catalyst into a reactor; and successively subjecting the deactivated catalyst to washing with cleaning oil, purging with inert gas, hydroconversion and hydrogenolysis, oxygen oxidation and hydrogen reduction so as to restore the activity of the catalyst. Different from conventional out-of-reactor regeneration methods, the method provided by the invention removes toxic matters and impurities on the surface and in the pore channels of the catalyst in the reactor through physical processes like on-line solvent cleaning and purging with inert gas such as nitrogen and chemical processeslike hydroconversion, hydrogenolysis and low-temperature oxidation without dismounting of the catalyst, so the method avoids dismounting and filling of catalyst duringout-of-reactor regeneration, degradation of noble metals due to high-temperature oxidation during out-of-reactor regeneration and deposition of sulfate converted from sulfur species on the surface ofthe catalyst during high-temperature oxidation of the sulfur species, and can effectively extend the service life of the catalyst.

Description

technical field [0001] The present invention relates to a regeneration method of isomerization dewaxing catalyst, in particular to a method for regenerating the catalyst in the reactor without dismantling the catalyst from the reactor so as to remove harmful substances deposited on the catalyst A method for regenerating an isomerization dewaxing catalyst for recovering catalyst activity. Background technique [0002] A solid hydrogenation catalyst consists of a carrier and metals. The carrier includes alumina, amorphous silicon aluminum, molecular sieve, etc., and the metals are classified into non-noble metals such as Ni, Mo, W, or noble metals such as Pt, Pd. The deactivation of hydrogenation catalysts can be divided into the following five situations: (1) poisoning, that is, impurities contained in the catalyst during preparation or impurities present in the reactants are adsorbed on the active sites of the catalyst; (2) metal sintering, the reaction temperature is extre...

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Problems solved by technology

[0008] In short, in addition to the external oxidation regeneration method, the internal reduction regeneration method disclosed in the above-mentioned patent is also not suitable for the noble metal / molecular sieve type lubricating oil isomerization dewaxing catalyst

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