Full-cut fraction pyrolysis gasoline diolefin selective hydrogenation method

Abstract

The invention provides a selectivity hydrogenation method for diolefin of full-fraction pyrolysis gasoline, which comprises reduction and passivation of catalyst and application of technological conditions. The catalyst is nickel series hydrogenation catalyst which is used after being reduced or being subjected to reduction and passivation. The selectivity hydrogenation method is characterized in that the hydrogenation technological conditions are as follows: the volume space velocity of a liquid is less than or equal to 4h<-1>, the inlet temperature of a reactor is between 40 and 130 DEG C, the reaction pressure is more than or equal to 2 MPa, and the hydrogen/oil ratio is between 100 and 500 (v/v); the nickel series catalyst takes alumina as a carrier, is prepared by the immersion method, and contains 14 to 20 percent of nickel oxide, 1 to 8 percent of lanthanum oxide and/or cerium oxide, 1 to 8 percent of 4B oxide auxiliary agent, 2 to 8 percent of silicon dioxide and 1 to 8 percent of alkaline earth oxide as calculated by 100 weight percent of the catalyst; and the specific surface of the catalyst is between 60 and 150 square meters per gram, and the pore volume of the catalyst is between 0.4 and 0.6 milliliter per gram. The invention also provides a method for performing reduction and passivation on the catalyst on a hydrogenation unit. Under the conditions of the application method and the technological conditions, the nickel catalyst has good hydrogenation performance, and particularly has strong impurity and colloid resistance and good hydrogenation stability.

Description

technical field [0001] The invention relates to a method for selective hydrotreating of medium and low distillate oil, which is suitable for the selective hydrogenation of diene unsaturated hydrocarbons, and is especially suitable for the selective hydrogenation of diolefins in full-distillate pyrolysis gasoline. Background technique [0002] Pyrolysis gasoline is a by-product of ethylene cracking, which accounts for more than 50% of ethylene production capacity. It contains highly unsaturated hydrocarbons, such as diolefins, styrene, etc., which are converted into corresponding monoolefins through selective hydrogenation. With the continuous enhancement of my country's ethylene production capacity, pyrolysis gasoline hydrogenation has been developed towards nickel-based catalysts for full-distillate hydrogenation. The variability of domestic pyrolysis gasoline raw materials, and the differences in cracking units and pyrolysis methods, make the pyrolysis gasoline raw materia...

AI Technical Summary

Problems solved by technology

CN1218822A has reported a kind of Ni / Al 2 o 3 A selective hydrogenation catalyst suitable for pyrolysis gasoline fractions. The catalyst is prepared by loading nickel on an alumina support containing lithium or alkaline earth metals. This catalyst is not good in hydrogenation load and hydrogenation stability.

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