C2 fraction selective-hydrogenation method

Abstract

The invention discloses a C2 fraction selective-hydrogenation method. The C2 fraction selective-hydrogenation method is characterized in that a front hydrogenation technology adopting a front depropanization process is used, tower top effluent from a front depropanization tower in an ethylene device is fed into an adiabatic bed reactor and undergoes a selective-hydrogenation reaction so that alkynes and dialkene are removed, a selective-hydrogenation catalyst used by the adiabatic bed reactor utilizes carriers which comprise alumina or mainly comprise alumina, have bimodal pore distributed structures and contain double active components of Pd and Ni, Ni as a coking-resistant component is mainly distributed in large pores, the catalyst comprises, by mass, 0.010-0.1% of Pd and 0.1-1% of Ni and has specific surface area of 1-20m<2> / g and pore volume of 0.1-0.35ml / g, and the reaction conditions comprise an adiabatic bed reactor inlet temperature of 35-180 DEG C, reaction pressure of 2-4MPa and gaseous hourly space velocity of 4000-25000h<-1>. The C2 fraction selective-hydrogenation method has the advantages of difficult coking and greatly-prolonged catalyst service life.

Description

technical field [0001] The invention relates to a method for selective hydrogenation, in particular to a method for selective hydrogenation of carbon distillates to remove acetylene. Background technique [0002] The production of ethylene is the leader of the petrochemical industry. The selective hydrogenation of acetylene in steam cracking products plays an extremely important role in the ethylene processing industry. In addition to ensuring that the content of acetylene at the outlet of the hydrogenation reactor meets the standard, the selectivity of the catalyst is excellent. It can make ethylene produce as little ethane as possible, which is of great significance for improving the ethylene yield of the whole process and improving the economic benefit of the device. [0003] In the current carbon distillate hydrogenation and removal of alkyne, more and more methods of hydrogenation before carbon distillate are used. The characteristic of this process method is that the h...

AI Technical Summary

Problems solved by technology

Due to the low selectivity of the reaction at low space velocity, it is easy to cause runaway temperature. At present, the lowest safe space velocity is 4500 / h. That is to say, when the space velocity of the device is lower than this value, the reactor is prone to runaway temperature. Threat to the operation of the device

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