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[Chemical Knowledge]：Production and manufacturing method and process of isobutylene

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The manufacturing method
of isobutylene
Isobutylene is an important chemical raw material, which is widely used in the production of various chemicals, such as methyl tert-butyl ether, polyisobutylene, butyl rubber and so on. This article will introduce the manufacturing method of isobutylene.

1. hydrocarbon cracking process

hydrocarbon cracking process is the main method of industrial production of isobutylene. The method uses naphtha, light diesel and other hydrocarbons as raw materials, and under high temperature and low pressure conditions, various olefins, including isobutene, are generated by cracking reactions. The cracking reaction is generally carried out in a tube furnace, the reaction temperature is generally 750-850 ° C., and the pressure is 0.1-0.2MPa. The cracking gas is cooled, separated and refined to obtain isobutylene products. The advantage of

hydrocarbon cracking method is that it can use low-cost naphtha, light diesel and other hydrocarbons as raw materials, and the production cost is relatively low. However, the disadvantage of this method is that the energy consumption of the production process is high, and a large amount of by-products and waste gas will be produced, which will cause certain pollution to the environment.

2. Butene Oxidation

Butene oxidation is a method for producing isobutene from butene as a raw material. The method uses butene and oxygen as raw materials, and under the action of a catalyst, isobutene is produced through oxidation reaction. The reaction is generally carried out in a fixed bed reactor, the reaction temperature is generally 200-350 ° C., and the pressure is 0.5-2.0MPa. The reaction product is cooled, separated and purified to obtain isobutylene product. The advantage of the

butene oxidation method is that the production process is relatively simple and does not produce a large amount of by-products and exhaust gases. However, the disadvantages of this method are that the raw material cost is high and a catalyst is required, which increases the production cost.

3. Isobutane Dehydrogenation

Isobutane dehydrogenation is a method for producing isobutene from isobutane. The method uses isobutane and hydrogen as raw materials, under the action of high temperature and catalyst, through dehydrogenation reaction to produce isobutene. The reaction is generally carried out in a fixed bed reactor at a temperature of generally 550-700°C and a pressure of 1.0-3.0MPa. The reaction product is cooled, separated and purified to obtain isobutylene product.

isobutane dehydrogenation process has the advantage of relatively low raw material cost and does not produce a large amount of by-products and waste gas. However, the disadvantage of this method is that the production process requires high temperature and catalyst, the energy consumption is high, and the catalyst needs to be replaced regularly, which increases the production cost.

In short, there are many methods for manufacturing isobutylene, and the advantages and disadvantages of different methods are different. The suitable production method should be selected according to the specific situation. At the same time, in order to reduce production costs and improve product quality, it is necessary to strengthen the research and improvement of production technology to improve production efficiency and product quality.

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