Hydrogenation upgrading method for ethylene cracking by-product carbon-9 fraction

Abstract

The invention discloses a hydrogenation upgrading method for an ethylene cracking by-product carbon-9 fraction. The method is to adopt a carbon-9 fraction and hydrogen as raw materials to carry out a hydrogenation reaction, which takes place in a continuous fixed bed reactor containing a catalyst and undergoes stable tests for 200 to 500 hours. The hydrogenation is carried out under a condition in which the pressure is between 0.5 to 1.5 MPa, the temperature is between 40 to 120 DEG C, the volumetric space velocity is 0.5 to 2.0 per hour, and the hydrogen-oil ratio is 400-1500:1. The catalyst comprises the following components in percentage by mass: 15-30% of nickel, 2-10% of titanium, and the balance being alumina. The hydrogenation upgrading method provided by the invention has the advantages that reaction conditions are mild, and the catalyst is high in activity, renewable and reusable.

Description

technical field [0001] The invention specifically relates to a method for hydrogenation and upgrading of the carbon nine fraction, a by-product of ethylene cracking. Background technique [0002] The by-product of ethylene cracking process is about 12% of carbon nine and above carbon nine components, which is the fraction after separation of carbon eight, containing carbon nine and carbon ten above components, generally referred to as cracked carbon nine, because it contains a large amount of unsaturated Olefins, dienes, and organic sulfur content are high, and the C9 mixture is dark yellow in color and has an unpleasant pungent smell. Except for some of them are used as raw materials for synthesizing C9 petroleum resin, most of them are burned as fuel. [0003] At present, most of the C9 fractions are upgraded by hydrotreating, and the hydrogenation pressure is relatively high, at 2-5 MPa. Since C9 contains a large amount of active diolefins, the heat release during the...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the C9 fractions are upgraded by hydrotreating, and the hydrogenation pressure is relatively high, at 2-5 MPa. Since C9 contains a large amount of active diolefins, the heat release during the hydrogenation process is severe, and the catalyst is easy to coke and deactivate the catalyst. , resulting in short catalyst usage time and high cost

The catalysts used in the hydrogenation of C9 reported mostly use nickel-based co-precipitation or impregnated catalysts, and the carrier is alumina. If this type of catalyst is deactivated and regenerated by calcination, the nickel crystal is easy to sinter at a high temperature of 450 ° C, resulting in a significant drop in activity.