Hydrorefining method of middle and low distillate oil

Abstract

The invention provides a hydrorefining method of middle and low distillate oil. The hydrorefining method is characterized in that a used catalyst is a molybdenum nickel hydrogenation catalyst; hydrogenation process conditions are as follows: an inlet temperature is 200-300 DEG C, an operation pressure is larger than or equal to 2.4MPa, the volume space speed of a liquid is 1-5 h<-1>, and the volume ratio of hydrogen to oil is 100-500; in the molybdenum nickel catalyst, silicon-containing alumina is a carrier, molybdenum and nickel are active components, and phosphorus and alkali metals are auxiliaries; and the precursor of the silicon-containing alumina carrier is pseudoboehmite containing amorphous silicon and aluminum and is obtained by the steps of firstly preparing an amorphous silicon and aluminum slurry and a pseudoboehmite slurry, mixing the slurries and then ageing, and then carrying out post-treatment processes such as filtering, washing and drying. By using the method, hydrorefining is carried out on a first-section hydrogenation product of cracked gasoline containing middle and low distillates, wherein the bromine value of the hydrogenation product is less than 1.0*10<-2>g / g, and the sulfur content of the hydrogenation product is less than 1.0mu g / g, thereby meeting the second-section hydrogenation requirement of cracked gasoline.

Description

technical field [0001] The invention relates to a hydrofinishing method for middle and low distillate oil, which is especially suitable for the second stage hydrofinishing of middle and low distillate 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 hyd...

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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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