Preparation method of alkylene oxide

A technology of alkylene oxide and olefin, which is applied in the field of preparation of alkylene oxide, can solve the problems of many reaction by-products, complex post-treatment, and inability to completely replace the chlorohydrinization method, and achieve the effect of green production and waste water reduction

Active Publication Date: 2022-03-29
NOVASHIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the shortcomings of this method, co-oxidation, direct oxidation and other production methods of alkylene oxide have been developed in industry. Although these methods solve the problem of saline wastewater, due to the introduction of strong oxidation reactions, there are reactions in both co-oxidation and direct oxidation. The disadvantages of many by-products and complicated post-treatment cannot completely replace the chloroalcoholization method. Therefore, in the existing production equipment and processes of alkylene oxide, the use of the chlorohydrinization method still accounts for more than half of the country.

Method used

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  • Preparation method of alkylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Chlorohydration reaction

[0051] The reaction device is a 1000ml four-necked round-bottomed glass flask equipped with a mechanical stirrer with a stirring speed of 100rpm. Two bottom tubes are arranged at the two bottlenecks, one for chlorine gas and the other for propylene gas. Containing 20wt% calcium chloride solution in the reaction solution, the total reaction solution volume is 800ml, the hot water bath controls the reaction temperature to 50°C, and the reaction flask is wrapped with black plastic cloth to avoid light.

[0052] Chlorine gas is fed under the liquid level of the reaction flask at a speed of 52ml / min (2.3mmol / min), and propylene is passed under the liquid level of the reaction flask at a speed of 62ml / min (2.7mmol / h).

[0053] The gas phase is removed from the gas phase space of the reaction bottle, and is absorbed by lye and ethyl acetate in two stages.

[0054] Analyze the content of chloropropanol and impurities in the reaction material, and ana...

Embodiment 2

[0060] Chlorohydration reaction

[0061] The operating parameters and feeding amount are the same as in Example 1, except that the saponification waste liquid in Example 1 is used as the reaction solution.

[0062] After ventilating for 205 minutes, the mass fraction of chloropropanol in the reaction liquid reached about 3.1 wt%, and the appearance of the reaction liquid was light yellow.

[0063] The analysis result shows that the content of chloropropanol in the reaction liquid is 3.1wt%, the content of DCP is 0.16wt%, the content of PCE is 0.083wt%, the content of chloroacetone is 0.013wt%, and the content of calcium chloride is 19.6wt%.

[0064] saponification reaction

[0065] 823g of the above-mentioned chloroalcoholization reaction solution (containing 270mmol of PCH), 141g of 17wt% calcium hydroxide aqueous emulsion (324mmol) were mixed and added to the reaction flask, the reaction temperature was controlled at 75°C, and the stripping reaction solution was introduced ...

Embodiment 3

[0068] Such as figure 1 The process flow diagram for the preparation of propylene oxide is shown, the process water 1 and / or the saponification waste liquid 12 returned to the chlorohydrination reactor is added to the chlorohydrination reactor, and chlorine gas 2 and propylene 3 are introduced to obtain a concentration of 2-5 wt of chloropropanol Chloroalcoholization reaction solution 4, chloroalcoholization reaction solution 4 enters saponification reactor and milk of lime 11 saponification reaction, milk of lime 11 is made of solid calcium hydroxide 10 and is used for preparing milk of lime saponification waste liquid 9 and / or process water mixture preparation. The heat of the saponification reaction is provided by the steam 6 and / or the recovered steam 16 produced by evaporation and concentration, and the saponification generates propylene oxide 5 and saponification waste liquid 7, and the saponification waste liquid 7 is pretreated to obtain the saponification waste liquid...

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Abstract

The invention discloses a preparation method of alkylene oxide. The preparation method comprises the following steps: contacting a chlorohydrin aqueous solution containing high-concentration metal chloride with alkali for saponification reaction to obtain crude alkylene oxide and saponification waste liquid; the concentration of the metal chloride in the chlorohydrin aqueous solution is not less than 10wt%. According to the preparation method of the alkylene oxide, provided by the invention, wastewater can be reduced or even not generated, and green production of the alkylene oxide prepared by a chlorohydrination method is realized.

Description

technical field [0001] The invention belongs to the field of alkylene oxide preparation, and in particular relates to a preparation method of alkylene oxide. Background technique [0002] Alkylene oxides are an important class of organic chemicals, mainly used in the preparation of diols and polyethers, and are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. The production and preparation methods of alkylene oxide mainly include chlorohydrination method, co-oxidation method and direct oxidation method, among which chlorohydrination method has the advantages of less investment, mild reaction, high production safety, relatively mature process and short process. For example, the preparation process of the chloroalcoholization method of propylene oxide includes: the reaction of chlorine gas and propylene to generate an aqueous solution of chloropropanol, and the saponification reaction of an aqueous solution of chloropropanol and calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/26C07D301/32
CPCC07D303/04C07D301/26C07D301/32
Inventor 代俊明杨冬梅宴成强潘中霞陈天圆韩凯杨建春
Owner NOVASHIN CO LTD
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