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[Chemical Knowledge]：Propylene raw gas production method and process flow

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Manufacturing method
of propylene feed gas
propylene is an important chemical raw material, which is widely used in the production of various chemicals, polymers and fuels. The manufacturing methods of propylene feed gas mainly include steam cracking, catalytic cracking, propane dehydrogenation, etc. This article will detail these manufacturing methods and their advantages and disadvantages.

1. Steam cracking

steam cracking is a commonly used propylene raw gas manufacturing method, mainly naphtha, ethane, propane and other raw materials, through high temperature and high pressure steam cracking reaction, the production of propylene, ethylene and other low-carbon olefins. The advantages of this method are that the raw materials are readily available, the production process is mature, and the propylene yield is high; the disadvantage is that the energy consumption is high, high temperature and high pressure conditions are required, and the equipment investment is large.

2. catalytic cracking

catalytic cracking is a heavy oil light process, mainly heavy oil as raw material, through the role of the catalyst, the heavy oil cracking to produce light hydrocarbons, including propylene and so on. The advantage of this method is that heavy oil can be used as a raw material, and the production cost is low; the disadvantage is that the catalyst needs to be replaced regularly, and more by-products such as coke will be produced during the production process.

3. Propane dehydrogenation

Propane dehydrogenation is a reaction of dehydrogenation of propane molecules to propylene by heating and catalyst. The advantages of this method are high propylene yield and high product purity, while the disadvantage is that the price of raw material propane is high and the function of catalyst is required.

In addition to the above three methods, there are some emerging propylene feed gas manufacturing methods, such as biomass gasification, carbon dioxide reduction and so on. These methods are still in the research or experimental stage and have not yet been fully industrialized.

In general, different propylene raw material gas manufacturing methods have their own advantages and disadvantages, and should be selected according to specific raw material sources, production scale, product requirements and other factors. At the same time, with the continuous improvement of environmental protection requirements and the transformation of energy structure, the new propylene raw material gas manufacturing method will also get more attention and research. In the actual production process of

, in order to improve the yield and purity of propylene feed gas, the production process needs to be optimized and controlled. The following are some common optimization measures:

1. Optimize the ratio of raw materials: According to different raw material properties and reaction conditions, reasonably adjust the ratio of raw materials to increase the yield of propylene.

2. Enhance the activity of the catalyst: select the catalyst with high activity and good selectivity, and replace and regenerate the catalyst regularly to maintain its activity.

3. Control reaction conditions: according to the reaction mechanism and kinetic characteristics, reasonable control of reaction temperature, pressure, space velocity and other conditions, in order to improve the reaction selectivity and propylene yield.

4. Strengthen energy recovery: Recycling the waste heat and pressure generated in the production process to reduce energy consumption and cost.

In short, the manufacturing method of propylene feed gas needs to be selected and optimized according to the actual situation to improve production efficiency, reduce costs, improve product quality and environmental friendliness.

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