A kind of hydrogenation method of butadiene tail gas

Abstract

The invention provides a method for hydrotreating alkynes-rich butadiene tail gas. The method comprises the following steps: butadiene tail gas is extracted, the tail gas is absorbed, a liquid phase of a Ni-based catalyst which takes a titania-alumina compound is performed with a hydrotreating reaction is employed, the gas phase hydrogenation reaction of a Ni-Mo catalyst is used, and steps of desorption and rectification are carried out. According to the invention, the hidden trouble when the liquefaction method of pressure rising and condensation are employed on the butadiene tail gas is eliminated by the method provided by the invention, alkene content in the hydrotreating products is obviously reduced, the alkene content is less than 5%, and the requirement for cracking the raw material can be reached.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for hydrogenation of tail gas rich in alkynes produced by a butadiene extraction device. Background technique [0002] The 1,3-butadiene in the cracked C4 fraction is generally refined by two-stage solvent extraction rectification and ordinary rectification. This device produces butadiene tail gas rich in alkynes. The concentration of alkynes in the butadiene tail gas is relatively high, generally greater than 20% by weight, and the highest can exceed 40% by weight. These alkyne-rich waste gases have no industrial value at present and can only be sent to torch for combustion. Since high-concentration alkynes are easy to polymerize and explode, the raffinate containing butane and butene is generally used for dilution and then sent to a torch for combustion, which causes a great waste of resources. With the deepening of steam cracking of hydrocarbons in recent years...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems existing in the prior art, such as difficult liquefaction of butadiene tail gas raw materials, potential safety hazards in the process of boosting liquefaction, high olefin content in the product, short reactor operation period, and frequent catalyst regeneration, etc., the present invention provides a A kind of butadiene tail gas hydrogenation method

[0010] The present invention adopts the combination of tail gas absorption tower, titanium oxide-alumina composite as carrier, hydrogenation reaction and desorption tower with nickel as active component catalyst to solve the problem of butadiene tail gas adopting boosting and condensing liquefaction method There are potential safety hazards, high olefin content in hydrogenated products, and high operating costs. The olefin content is less than 5%, which meets the requirements for cracking raw materials for ethylene units.

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