Method for preparing monoolefine from diolefin through hydrogenation

Abstract

The invention relates to a method for preparing monoolefine from diolefine through hydrogenation, in particular to a method for preparing monoolefine from C10-C15 diolefine through hydrogenation. The method is characterized by comprising the following steps that in a plurality of hydrogenation reactors connected in series, an alkane olefin mixture flow containing C10-C15 monoolefine and C10-C15 diolefine makes contact with a specific hydrogenation catalyst under hydrogenation reaction conditions, hydrogen is respectively injected into each reactor, the catalyst is formed by combining an inner substance and an outer substance with different properties, the inner first-layer substance has lower porosity, the outer second-layer substance has first-type pores and second-type pores, the maximum value of the pore size distribution of the first-type pores is 4-50nm, and the maximum value of the pore size distribution of the second-type pores is 100- 1000 nm. The catalyst has relatively low permeability of the first layer of noble metal carrier and is beneficial to recovery of noble metal, and the method has outstanding selectivity and activity in a diolefin selective hydrogenation reaction process.

Description

technical field [0001] The application relates to a method of hydrogenating diolefins into monoolefins, in particular to a method of making C 10 ~C 15 Process for the hydrogenation of diolefins to monoolefins. Background technique [0002] Long-chain hydrocarbons are involved in the production of synthetic detergents and various surfactants, such as in the process of dehydrogenation to produce detergent raw materials - linear alkylbenzene C 10 ~C 15 The monoolefin products produced by the dehydrogenation of long-chain alkanes contain a small amount of diolefins. The presence of these diolefins will cause a large number of side reactions in the subsequent alkylation process, reducing the yield and quality of alkylbenzene. The selective hydrogenation of diolefins in the dehydrogenation product by the method of selective hydrogenation of diolefins to generate monoolefins can effectively improve the quality of alkylbenzenes on the basis of increasing the yield of alkylbenzene...

AI Technical Summary

Problems solved by technology

[0006] In a selective hydrogenation reaction, C 10 ~C 15 Diolefins will enter the pores of the catalyst carrier during the reaction, diffuse from the surface of the catalyst through the pores to the interior of the catalyst, and the C produced by the reaction 10 ~C 15 The monoolefin then diffuses from the inside of the catalyst through the pores to the surface of the catalyst, due to the C 10 ~C 15 Diolefins have long carbon chains, and the resistance to mass transfer in the pores of the catalyst carrier is large. Traditional catalysts have long internal diffusion distances and long residence times, which are very prone to deep side reactions, which reduces the conversion rate and selectivity of hydrogenation reactions.