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[Chemical Knowledge]：Production and manufacturing method and process flow of piperylene

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The manufacturing method
of piperylene
piperylene (IPD) is an important chemical raw material, which is widely used in rubber, plastics, oil additives and other fields. Its manufacturing methods are mainly petroleum cracking method, isoprene method, acetylene method and so on. This article will detail these manufacturing methods.

1. Petroleum cracking method

Petroleum cracking method is a method of generating pentadiene by high temperature cracking of petroleum hydrocarbons as raw materials. This method has a wide range of raw materials and low production cost, which is one of the commonly used methods in industrial production. The specific steps are as follows:

(1) Raw material pretreatment: the petroleum hydrocarbon is subjected to pretreatment such as desulfurization and dehydration to ensure the smooth progress of the cracking process.

(2) cracking reaction: under high temperature conditions, the cracking reaction of petroleum hydrocarbons occurs to generate various olefins, including piperylene.

(3) separation and purification: by distillation, extraction and other separation methods, the pentadiene is separated from the cracking product, and purified.

2. Isoprene Method

The isoprene method is a method in which isoprene is used as a raw material, and isoprene is isomerized by the action of a catalyst to produce piperylene. This method has a single raw material and high product purity, but the production cost is relatively high. The specific steps are as follows:

(1) Raw material pretreatment: isoprene is purified to remove impurities.

(2) isomerization reaction: under the action of the catalyst, isoprene isomerization reaction, the formation of pentadiene.

(3) Separation and purification: The piperylene is separated from the reaction product by a separation method such as distillation and crystallization, and purified.

3. acetylene method

acetylene method is acetylene and formaldehyde as raw materials, through the role of the catalyst, the formation of pentadiene addition reaction method. In this method, the raw materials are easy to obtain, the reaction conditions are relatively mild, but the product yield is low. The specific steps are as follows:

(1) Raw material pretreatment: acetylene and formaldehyde are purified to remove impurities.

(2) Addition reaction: Under the action of a catalyst, acetylene and formaldehyde undergo an addition reaction to generate 1,4-butynediol.

(3) cyclization reaction: 1,4-butynediol undergoes cyclization reaction under acidic conditions to generate piperylene.

(4) Separation and purification: The piperylene is separated from the reaction product by a separation method such as distillation and extraction, and purified.

above three methods can be used for the manufacture of pentadiene in industrial production, but each method has its advantages and disadvantages and scope of application. When choosing a manufacturing method, it is necessary to consider the source of raw materials, production cost, product purity and other factors.

In addition, with the continuous progress of science and technology, new manufacturing methods are constantly emerging. For example, the production of pentadiene by biological method has become a research hotspot, and high-purity pentadiene can be obtained by microbial fermentation or plant extraction. The emergence of these new methods provides more options and possibilities for the manufacture of piperylene.

In conclusion, there are various methods for manufacturing piperylene, and each method has its own characteristics and scope of application. When choosing a manufacturing method, it is necessary to consider comprehensively according to the specific situation to obtain the best production effect.

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