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[Chemical Knowledge]：Production process and preparation method of propylene oxide

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Propylene oxide, also known as propoxycyclopropane, is an organic compound with the molecular formula C3H6O, which is a colorless liquid. It is widely used in synthetic resins, coatings, surfactants and adhesives and other industries, with great market value and application prospects. Next, we will introduce the production process and preparation method of propylene oxide in detail.
1. Propylene Oxide Production Process There are two main processes for the production of
propylene oxide: chloropropane method and cyclopropyl alcohol method.
1. Chloropropane
Chloropropane method is the traditional production process of propylene oxide, and its reaction raw materials are chloropropane and sodium hydroxide. The specific steps are as follows:
(1) Chloropropane and sodium hydroxide solution are mixed and stirred evenly.
(2) The reaction solution is heated to about 85°C and maintained for a certain reaction time.
(3) A small amount of catalyst, such as lead tetraacetate and ferric chloride, is added to the reaction solution.
(4) The reaction solution is continued to be heated to the end of the reaction.
(5) The propylene oxide product is obtained by filtration.
2. Cyclopropyl alcohol method
Cyclopropyl alcohol method is a newly developed propylene oxide production process in recent years, and its reaction materials are cyclopropyl alcohol and hydrogen peroxide. The specific steps are as follows:
(1) Mixing cyclopropyl alcohol and hydrogen peroxide to obtain a reaction solution.
(2) The reaction solution is heated to about 100°C and maintained for a certain reaction time.
(3) A small amount of catalyst, such as phosphoric acid and potassium dihydrogen phosphate, is added to the reaction solution.
(4) The reaction solution is continued to be heated to the end of the reaction.
(5) The propylene oxide product is obtained by filtration. The preparation method of
2. propylene oxide There are also many methods for the preparation of
propylene oxide, and the following are some of the more common ones.
1. Industrial production method
Industrial production method refers to the method of preparing propylene oxide through chemical reaction, distillation separation and other processes. Its main raw materials are propylene, hydrogen peroxide and hydrogen chloride. The specific steps are as follows:
Propylene and hydrogen peroxide solution are mixed and chemically reacted under heating to obtain propylene hydroxide.
(2) Propylene hydroxide and hydrogen chloride are mixed and further subjected to a chemical reaction to obtain quaternary pentylenetetraether.
(3) The quaternary pentyl tetraether is separated by distillation to obtain pure propylene oxide.
2. Laboratory preparation method
laboratory preparation method refers to the method of preparing propylene oxide by chemical reaction and other methods in the laboratory. The main raw materials are cyclopropyl alcohol and hydrogen peroxide. The specific steps are as follows:
(1) Cyclopropyl alcohol and hydrogen peroxide are mixed and chemically reacted under heating to obtain propylene oxide.
(2) The reaction product is purified to obtain pure propylene oxide. Summary of
3.
Propylene oxide is an organic compound widely used in industries such as synthetic resins, coatings, surfactants and adhesives. Its production process includes the chloropropane method and the cyclopropyl alcohol method. The chloropropane method is the traditional production process of propylene oxide, while the cyclopropyl alcohol method is a newly developed propylene oxide production process in recent years. There are also many methods for preparing propylene oxide, among which the more common ones include industrial production and laboratory preparation. As an important organic compound, propylene oxide will continue to play a significant role in the future chemical industry.