Desulphurization method of cracked C5 fraction

Abstract

The invention relates to a desulphurization method of cracked C5 fraction. The desulphurization method of cracked C5 fraction comprises the following steps: firstly adding a desulfurizer into a cracked C5 fraction raw material, and carrying out a reaction at a certain pressure and a certain temperature for a while; separating a cracked C5 fraction which is free of sulfur from the top of a tower by a filtering and a distillation method; after reaction, obtaining a sulfur compound in a column bottom; the desulfurizer comprises the following components: 3-8% of triethanolamine, 3-8% of acetonitrile, 3-8% of toluene, 3-8% of acetone, 8-12% of benzene, 25-35% of saturated ammoniacal liquor, 8-12% of butyronityile, 8-12% of cyclohexane, 10-20% of aniline, and 3-8% of diethyltoluenediamine. According to the method, a proper amount of desulfurizer is added into the cracked C5 fraction raw material, and the purpose for desulphurization of cracked C5 fraction is realized by the methods of filtering and distillation. The method provided by the invention has a good desulphurization effect, by-products are not introduced into the desulphurized product, and the composition of the cracked C5 fraction is not changed; the desulfurizer has little toxicity and is not volatile and inflammable.

Description

technical field [0001] The invention relates to a desulfurization method for cracking carbon five. Background technique [0002] Pyrolysis carbon five is a by-product of naphtha cracking to ethylene, which contains a variety of special active olefins, and is widely used in daily life because of its unique chemical properties. C5 cracking contains many high value-added components, such as isoprene, cyclopentadiene, dicyclopentadiene, cyclopentane, etc., which make C5 cracking play an important role in hydrogenation raw materials and petroleum resin raw materials. effect. [0003] Due to the separation process and raw materials of cracked C5, there will be more than 50 μg / g to 600 μg / g of sulfur in the cracked C5 raw material. When cracking C5 as a raw material for hydrogenation C5, the primary anti-catalyst for hydrogenation on the market is palladium or nickel catalyst. These two catalysts will generate metal sulfides when the sulfur content is high, thereby deactivating t...

AI Technical Summary

Problems solved by technology

When cracking C5 as a raw material for hydrogenation C5, the primary anti-catalyst for hydrogenation on the market is palladium or nickel catalyst. These two catalysts will generate metal sulfides when the sulfur content is high, thereby deactivating the catalyst. , and in the process of reducing the catalyst, the palladium or nickel catalyst will change the crystal form to form a macromolecular crystal form, which will reduce the effective contact area of ​​the catalyst, so the activity of the catalyst will still drop significantly after reduction. Therefore, when cracking carbon five as a hydrogenation raw material The content of cracked carbon pentasulfur is required to be less than 10μg / g

When pyrolysis C5 is used as the raw material of petroleum resin, due to the relevant laws promulgated by the state in 2011 to limit the sulfur content of petroleum resin, the control of sulfur content in petroleum resin is achieved by controlling the sulfur content of raw materials, and controlling the sulfur content through other means will complicate the process And greatly increase the production cost, so the sulfur content of petroleum resin raw materials is required to be within 10μg / g

However, at present, there is no effective and feasible method in the field of cracking C5 desulfurization in China. The research on a desulfurization method for cracking C5 is of great significance