A kind of hydrorefining method of distillate oil

Abstract

The invention provides a hydrorefining method of distillate oil. In the hydrorefining method, a cobalt molybdenum nickel hydrogenation catalyst is used; hydrogenation process conditions are as follows: the inlet temperature is 200-320 DEG C, the operation pressure is larger than or equal to 2.4MPa, the volume space velocity of a liquid is 1-5h<-1>, and the volume ratio of hydrogen to oil is 100-500; in the cobalt molybdenum nickel hydrogenation catalyst, silicon-containing alumina is used as a carrier, cobalt, molybdenum and nickel are used as active components, and phosphorus and alkali metal are added to be used as auxiliaries; and the precursor of the silicon-containing alumina carrier is pseudo boehmite containing amorphous silica-alumina and is obtained by the steps of firstly preparing an amorphous silica-alumina slurry and a pseudo boehmite slurry, mixing the two slurries, ageing, and then carrying out posttreatment processes such as filtering, washing and drying. According to the invention, hydrorefining is carried out on a first-stage hydrogenation product of full-fraction cracked gasoline by using the hydrorefining method, wherein the bromine value in the hydrogenation product is less than 1.0*10<-2>g / g and the content of sulfur in the hydrogenation product is less than 1.0mu g / g, thereby meeting the second-stage hydrogenation requirements of the cracked gasoline.

Description

technical field [0001] The invention relates to a method for hydrofinishing of distillate oil, which is especially suitable for the hydrofinishing of the second stage of whole-fraction pyrolysis gasoline. Background technique [0002] Pyrolysis gasoline is a by-product in the ethylene production process, and its output is more than 50% to 80% of the ethylene production capacity, of which the aromatic content is as high as 50%, which is an important aromatic resource, which contains highly unsaturated hydrocarbons, such as: diolefins, Styrene, etc., are generally used as raw materials for aromatics extraction after two-stage hydrogenation. In recent years, the ethylene industry has achieved unprecedented development, and the production capacity of ethylene has been increasing year by year. The output of pyrolysis gasoline, which is an important by-product of ethylene, is bound to increase significantly. The hydrogenation technology with pyrolysis gasoline hydrogenation catal...

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Problems solved by technology

[0005] CN1267187C discloses a silica-alumina containing pseudo-boehmite structure, the carrier silica content is high, and the silicon-containing compound solution is directly or co-currently introduced into the pseudo-boehmite slurry, the purpose It is to increase the content of four-coordinated aluminum to increase the acid strength and acid amount of alumina. The prepared silicon-containing alumina has high cracking activity. However, the higher cracking activity is used as a hydrogenation catalyst carrier, which reduces the liquid yield.

However, the composite oxide prepared by this method has a large number of micropores, which is not suitable for being used as a carrier for hydrotreating catalysts of low and medium distillate oils.

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