Method for producing propylene oxide

Abstract

The invention discloses a chemical production method, in particular a novel green production process for propylene oxide. In the method, the process design is carried out by using bipolar membrane, electrodialysis, antiosmosis, air flotation, heat exchange, oxidation, and other technology. In the production process, sodium hydroxide replaces the conventional calcium hydroxide and generates sodium chloride through reaction; the sodium chloride generates hydrochloric acid and sodium hydroxide by the bipolar membrane technology; and the hydrochloric acid is recovered, and the sodium hydroxide and water can be recycled. Therefore, no new sodium hydroxide is needed and no wastewater is discharged in the production of the propylene oxide. The sodium hydroxide is added at the preliminary stage of the production of the propylene oxide, and the input amount of the sodium hydroxide is controlled between 5 and 15 percent. The novel green production process for the propylene oxide has the advantages that: the recycling of the water, sodium chloride and sodium hydroxide is realized, the effects of zero discharge and input reduction of production materials are substantially achieved, and finally better social and economic benefits are achieved. The novel green production process for the propylene oxide can be widely applied to the chlorohydrin production in China.

Description

technical field [0001] The invention relates to a chemical production method, in particular to a novel green production process of propylene oxide. technical background [0002] Propylene oxide (PO) is an important organic chemical raw material. Since its industrialization in 1931, the application range has been continuously expanded, and the demand has been increasing year by year. Propylene oxide is the third largest species of propylene derivatives after polypropylene and acrylonitrile, and it is also an important basic organic chemical raw material. It is widely used in the production of polyether, propylene glycol, surfactants, etc. With the development of polyurethane synthetic materials, unsaturated polyester resins, advanced synthetic detergents and other products, the demand for propylene oxide is growing rapidly. Propylene oxide is an organic chemical product with broad development prospects. Especially the emergence and rapid development of polyurethane foam, e...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the patent of this invention is to design and develop a new green production process of propylene oxide in view of the shortage that the current chloroalcoholization method will produce a large amount of saponification wastewater that is difficult to handle and needs to invest a large amount of quicklime in the production process.

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