Method for producing propylene oxide

A technology of propylene oxide and its production method, which is applied in the field of new green production technology of propylene oxide, can solve the problems such as difficult to handle saponified wastewater and large quicklime, and achieve the reduction of input of production raw materials, reduction of investment, good society and economy benefit effect

Active Publication Date: 2010-06-16
HANGZHOU WATER TREATMENT TECH DEV CENT
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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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  • Method for producing propylene oxide
  • Method for producing propylene oxide

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Embodiment 1

[0033] With a processing capacity of 50L per hour, the design, installation and commissioning of each processing device in the whole process are carried out, and the test is carried out:

[0034] 1. In the early stage of propylene oxide production, a certain amount of sodium hydroxide is pre-invested to provide the alkali required for saponification reaction, and the concentration is 8% to directly react with chloropropanol. The reaction temperature is 100°C, and the reaction pressure is 1.0 bar. The sodium hydroxide undergoes cyclic saponification to generate equivalent sodium chloride, thereby generating sodium chloride saponification wastewater. The sodium chloride concentration in the generated wastewater is 3.5%, the sodium hydroxide concentration is 0.2%, and the COD CrIt is 1200mg / L, and the water temperature is 83°C.

[0035] 2. The saponification wastewater is oxidized with ozone after one-stage air flotation, and then undergoes two-stage air flotation. The vacuum u...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/26C02F9/06C02F1/24C02F1/78C02F1/469C02F1/44
Inventor 金可勇金水玉周勇高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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