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A kind of method of producing epichlorohydrin

A technology of epichlorohydrin and chloropropene, which is applied in the direction of organic chemistry, can solve the problems affecting the yield and purity of epichlorohydrin, and achieve the effect of high purity

Active Publication Date: 2015-10-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But still contain a certain amount of reaction solvent in the liquid phase that is rich in epichlorohydrin obtained by this method, thus influence the yield and the purity of the epichlorohydrin that finally obtains

Method used

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  • A kind of method of producing epichlorohydrin
  • A kind of method of producing epichlorohydrin
  • A kind of method of producing epichlorohydrin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] At room temperature (25°C) and normal pressure (1 standard atmospheric pressure), after mixing 100 parts by weight of epoxidation reaction mixture with 65 parts by weight of water as the first extractant, it is fed from the lower part of the first extraction tower, and 65 parts by weight of 3-chloropropene (industrial grade, purchased from Baling Petrochemical Co., Ltd., the content of 3-chloropropene is 97% by weight) is added from the top of the first extraction tower as the second extraction agent, so that the two streams Countercurrent contacting is carried out at a temperature of 12°C, and the first extraction phase rich in epichlorohydrin as a heavy liquid phase is obtained from the bottom of the first extraction tower, and the first extraction phase rich in epichlorohydrin as a heavy liquid phase is obtained from the top of the first extraction tower as Methanol-rich first raffinate phase of the light liquid phase.

[0088] The first extraction phase is sent from...

Embodiment 2

[0092] Adopt the same method as Example 1 to separate epichlorohydrin, the difference is that the second extraction phase obtained by the second extraction tower replaces the water used as the first extraction agent in Example 1, wherein the amount of the second extraction phase Same as the consumption of water as the first extractant in Example 1.

[0093] The composition of the obtained second raffinate phase was detected, and the extraction rate of epichlorohydrin and methanol content were calculated, and the results are listed in Table 1.

Embodiment 3

[0102] At room temperature (25°C) and normal pressure (1 standard atmospheric pressure), after mixing 100 parts by weight of the epoxidation reaction mixture with 100 parts by weight of the second extraction phase as the first extractant, it is sent from the lower part of the first extraction tower Into, 50 parts by weight of 3-chloropropene (industrial grade, purchased from Baling Petrochemical Co., Ltd., the content of 3-chloropropene is 97% by weight) is added from the top of the first extraction tower as the second extraction agent, so that The two streams are contacted countercurrently at a temperature of 35° C., and the first extract phase rich in epichlorohydrin as a heavy liquid phase is obtained from the bottom of the first extraction tower. From the tower of the first extraction tower A first methanol-rich raffinate phase was obtained as a light liquid phase.

[0103] The first extraction phase is sent from the lower part of the second extraction tower, and 50 parts ...

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Abstract

The invention provides a method for producing epichlorohydrin. The method comprises an epoxidation reaction process and an extraction process, wherein the extraction process comprises the step of continuously extracting an epoxidation reaction mixture obtained by the epoxidation reaction process in two extracting towers, wherein in the first extracting tower, a mixture flow of the epoxidation reaction mixture and water is contacted with 3-allyl chloride reverse flow which flows from top to bottom to obtain an epichlorohydrin-containing extract phase, and the water and the 3-allyl chloride are in the weight ratio of 1:(0.5-2); in the second extracting tower, the epichlorohydrin-containing extract phase is contacted with a water reverse flow flowing from top to bottom to obtain a raffinate phase containing the epichlorohydrin and the 3-allyl chloride. The epichlorohydrin-rich raffinate phase obtained by the method disclosed by the invention does not contain or basically does not contain a reaction solvent, so that the epichlorohydrin with high purity can be obtained with higher yield.

Description

technical field [0001] The present invention relates to a method for producing epichlorohydrin. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and intermediate, widely used in the synthesis of various products such as epoxy resin, glycerin, chlorohydrin rubber, pharmaceuticals and pesticides. [0003] At present, the production methods of epichlorohydrin mainly include allyl chloride method and allyl alcohol method. The chloropropene method, also known as the high-temperature chlorination method, is the main method for producing epichlorohydrin, with mature technology and flexible production process. However, there are some serious defects in the chloropropene method, such as many by-products, high energy consumption, serious equipment corrosion, high equipment maintenance costs, and a large amount of CaCl-containing 2 Waste water with organic chlorine seriously endangers the environment, and the investment in treating waste wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/08C07D301/12C07D301/32
CPCC07D301/12C07D301/32C07D303/08
Inventor 高国华金欣张永强范瑛琦杜泽学杨克勇
Owner CHINA PETROLEUM & CHEM CORP