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Hypochlorous acid and preparation technology for generating epoxypropane by using same

A preparation process and technology of propylene oxide, applied in hypochlorous acid, organic chemistry and other directions, can solve the problem of low concentration of hypochlorous acid, and achieve the effects of high concentration, production cost saving and environmental protection

Active Publication Date: 2013-04-24
山东昌邑海能化学有限责任公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low concentration of hypochlorous acid produced by the traditional process is the main reason for the large amount of wastewater produced in the production of propylene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation technology of hypochlorous acid in the propylene oxide production process, carries out successively according to following steps:

[0027] 1) Chlorination process: Dilute chlorine gas and saturated sodium chloride alkali solution to 1.5m 3 / h, 0.1m 3 / h is introduced into the bottom of the tubular reactor through a pump, and a chlorination reaction occurs at the bottom of the tubular reactor to generate a hypochlorous acid solution. The temperature of the chlorination reaction is maintained at 10°C, and the pH of the hypochlorous acid solution is 5;

[0028] 2) Chloroalcoholization process: pass propylene into the hypochlorous acid solution to generate a monochloropropanol solution;

[0029] 3) Extraction process: introduce the monochloropropanol solution into the convection tower of the extractor, add the extractant trioctyl phosphate for extraction, the volume ratio of the extractant trioctyl phosphate to the monochloropropanol solution is 1:1, ...

Embodiment 2

[0033] The chlorine in embodiment one, saturated sodium chloride alkaline solution are replaced by volume respectively as 1.6m 3 / h, 0.15m 3 / h, the chlorination reaction temperature is maintained at 20°C, the pH value of the hypochlorous acid solution is 5.5; the extractant is replaced by tributyl phosphate, and the volume ratio of the extractant tributyl phosphate to the monochloropropanol solution is 1:2 , The extraction rate of monochloropropanol solution is 99.5%. The rest of the process and equipment used are the same as those in Embodiment 1, and will not be described again.

Embodiment 3

[0035] Chlorine in embodiment one, saturated sodium chloride alkaline solution are replaced by volume respectively as 1.7m 3 / h, 0.2m 3 / h, the chlorination reaction temperature is maintained at 60°C, the pH value of the hypochlorous acid solution is 6; the extractant is replaced by n-butyl acetate, and the volume ratio of the extractant n-butyl acetate to the monochloropropanol solution is 1:3 , the extraction rate of monochloropropanol solution was 98.1%. The rest of the process and equipment used are the same as those in Embodiment 1, and will not be described again.

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Abstract

The invention discloses hypochlorous acid and a preparation technology for generating epoxypropane by using the hypochlorous acid. The preparation technology is characterized in that chlorine gas and saturated sodium chloride aqueous alkali are introduced into the bottom of a tubular reactor through a pump, and chlorination reaction takes places at the bottom of the tubular reactor to generate a hypochlorous acid solution. The preparation technology has the beneficial effects that as the chlorine gas and the saturated sodium chloride aqueous alkali are introduced into the bottom of the tubular reactor through the pump, chlorination reaction takes places at the bottom of the tubular reactor to generate the hypochlorous acid solution, the concentration of the hypochlorous acid in the generated hypochlorous acid solution is high, so that chlorohydrination reaction completely takes places between the hypochlorous acid solution and propylene, further the yield of generated chloropropanol is high, the waste of the hypochlorous acid is avoided, the generation of lots of wastewater is avoided, and the quantity of wastewater generated due to production of the epoxypropane is reduced by 30%, and environments are protected.

Description

technical field [0001] The invention belongs to the technical field of production of fine chemical intermediates, in particular to hypochlorous acid and a preparation process for producing propylene oxide by using hypochlorous acid. Background technique [0002] With the development of industrial civilization, people's environmental protection awareness and requirements for industrial products and product follow-up are constantly increasing. Propylene oxide (PO) is an important organic chemical product. It is the third largest species after polypropylene and acrylonitrile among the important derivatives of propylene. It is mainly used to produce polyether and propylene glycol. It can also be used as a surfactant. [0003] At present, the chloroalcoholization method is mainly used in China to produce propylene oxide. Chlorine gas is passed into industrial water to generate hypochlorous acid. The concentration of hypochlorous acid is very low, and the amount of waste water pr...

Claims

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Application Information

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IPC IPC(8): C01B11/04C07D303/04C07D301/03
Inventor 蒲伟于强强裴迎迎艾蒙王凤王金富
Owner 山东昌邑海能化学有限责任公司
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