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A kind of method for preparing isobutene by isobutane chlorination

A technology of isobutane and isobutene, which is applied in the direction of hydrocarbon production from halogen-containing organic compounds, can solve the problems of harsh hydrogenation reaction conditions, low selectivity of isobutene, and low conversion rate of isobutane, and achieve easy control of reaction conditions, Improvement of conversion rate and selectivity and reduction of running cost

Inactive Publication Date: 2016-01-20
ZIBO HUATUO ENG TECH SERVICES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of the prior art, to manufacture isobutene from a brand-new process, to propose a method for isobutane chlorination to produce isobutene, and to solve the problem of isobutane conversion in the traditional isobutane dehydrogenation process Low efficiency, low selectivity of isobutene, harsh conditions for high temperature and high pressure hydrogenation reaction, high equipment investment, traditional process is endothermic reaction, high energy consumption, many by-products, catalyst is easy to coke and deactivate, isobutene is difficult to purify, must rely on MTBE synthesis Technical problems such as pure isobutene can be obtained through MTBE cracking

Method used

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  • A kind of method for preparing isobutene by isobutane chlorination
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  • A kind of method for preparing isobutene by isobutane chlorination

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Embodiment 1

[0039] Embodiment 1~20 adopts attached figure 1 The process, wherein the following examples 1 to 9 are examples of chlorination reactions with different parameters, and examples 10 to 20 are examples of de-HCL reactions with different parameters.

[0040] Chlorination reaction:

[0041] Example 1:

[0042] Raw material isobutane with a purity of more than 99% and circulating isobutane are preheated to 60°C by the feed heater, and enter the photochlorination reactor together with chlorine gas. The molar ratio of starting materials is isobutane: chlorine gas is 6:1 , under the conditions of 60°C, normal pressure, and 15W ultraviolet light irradiation, the chlorination reaction was carried out. During the reaction process, the feed rate of fresh raw material isobutane was controlled at 60L / h (2.68mol / h), and the feed rate of chlorine gas was 60L / h. h (2.68mol / h), the molar ratio of isobutane to chlorine in the reactor is maintained at 6:1, and the reflux of isobutane is control...

Embodiment 10

[0051] The isobutane monochloride obtained by the chlorination reaction enters the de-HCL reactor equipped with 0.581kg (active component Cu2+0.554mol) catalyst at 0.250Kg / h (2.7mol / h), and the isobutane monochloride The molar ratio with the catalyst is 4.87:1, and the de-HCL reaction is carried out at 140°C under normal pressure to obtain a mixture containing isobutene, HCL and unreacted isobutane monochloride, which is cooled and separated;

[0052] The separated liquid unreacted isobutane-chloride is recycled back to the HCL removal reaction system. After the gaseous material isobutene and HCL are pressurized, they enter the hydrochloric acid absorption device to remove HCL. After the isobutene is washed with alkali, the product isobutene (1.67mol / h) is obtained. .

[0053] In the HCL removal reaction, the conversion rate of isobutane-chloride is 62%, and the generated product is pure isobutene, and the content of isobutene is greater than 99% according to chromatographic a...

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Abstract

The invention discloses a method for preparing isobutylene with isobutane through chlorination. The method comprises the following steps: performing a chlorination reaction on isobutane and chlorine gas taken as starting raw materials under an illumination condition; performing a dehydrochlorination reaction on generated isobutylene monochloride in the presence of a catalyst to generate isobutylene. The comprehensive performance of the method is superior to the conventional process, the reaction condition is mild and easy to control, the energy consumption is low, the production running and investment costs are lowered, the converting rate is increased, the selectivity is improved, the product quality is high, the requirement in the national standard SH / T1726-2004 is met, and the method has high economic benefit and social benefit and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to the technical field of organic compounds, and specifically relates to a method for preparing isobutene by chlorination of isobutane. Background technique [0002] Isobutylene is an important chemical raw material, which can be used to produce butyl rubber, polyisobutylene, diisobutylene, triisobutylene, methyl methacrylate, 2,4-tert-butyl cresol, tert-butyl mercaptan, tert-butanol, tert-butyl Various deep-processing products such as butylamine, methallyl chloride, methacrylic acid, methacrylonitrile, pivalaldehyde and isoprene. Globally, the raw materials for the production of isobutene mainly come from the by-product C4 fraction of the naphtha steam cracking ethylene plant, the by-product C4 fraction of the fluid catalytic cracking (FCC) unit of the refinery, and the by-product of the Halcon process propylene oxide synthesis. Production of tert-butanol (TBA). The iso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/30C07C11/09
Inventor 蔡玉强高伟东郭宏斌
Owner ZIBO HUATUO ENG TECH SERVICES CO LTD
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