Preparation method of high-purity cyclopentene

Abstract

The invention discloses a preparation method of high-purity cyclopentene. The preparation method comprises the following steps: 1) a raw material ethylene cracking C9 fraction enters a desulfurization reactor for a desulfurization reaction; 2) feeding the material into a reactive distillation tower for depolymerization distillation to obtain cyclopentadiene at the tower top; 3) mixing cyclopentadiene, a solvent cyclopentene and hydrogen, and continuously carrying out catalytic hydrogenation reaction through a fixed bed catalyst bed layer; 4) carrying out thermal dimerization reaction on the hydrogenation product; and 5) separating the material through a cyclopentene refining tower to obtain a refined cyclopentene product at the tower top. According to the preparation method disclosed by the invention, a proper pretreatment process is adopted, cyclopentene is used as a hydrogenation reaction solvent, and a hydrogenation and dimerization reaction combined method is adopted, so that the subsequent product separation and refining process can be greatly simplified on the premise of ensuring a good hydrogenation reaction effect and the service life of the catalyst, and the energy consumption is reduced; and high-purity cyclopentene with the content of more than 99% is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation of cyclopentene, specifically, it relates to a method for preparing cyclopentene by using ethylene cracking C9 fraction as a raw material, especially adopting a combination process of selective hydrogenation and dimerization reaction to prepare high-purity cyclopentene pentene method. Background technique [0002] Cyclopentene (CPE) is a fine chemical product with a wide range of uses. It can be used to produce high value-added spices and pharmaceutical intermediates such as cyclopentanol, cyclopentanone, bromocyclopentane, chlorocyclopentane, and ketamine hydrochloride. More importantly, it is the main raw material for the synthesis of glutaraldehyde and polycycloolefin polymers. [0003] Cyclopentene can be obtained by various methods, and the method of selective hydrogenation of cyclopentadiene (CPD) is the most economical and widely used industrially. For the selective hydrogenation reac...

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Problems solved by technology

At present, the process of removing impurities such as sulfur and nitrogen is high-temperature hydrogenation or acid oxidation (such as CN201910569271.1), in which acid oxidation will produce a large amount of high-salt wastewater, which is difficult to treat; while hydrodesulfurization is due to the At a higher temperature, the diolefin raw material will be polymerized and the life of the catalyst will be affected

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