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Method for separating chloropropene and chloropropane

A technology of allyl chloride and propane chloride, which is applied in the field of purifying allyl chloride, can solve the problems of increasing material handling capacity and complicated separation process, and achieve the effects of reducing equipment investment and energy consumption, good separation effect and simple process

Active Publication Date: 2019-11-01
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Separation is achieved by changing the relative volatility of each component by adding an extractant, but the separation process is complicated after the introduction of the extractant, the extractant and the product need to be further separated, and the material handling capacity is increased at the same time
[0006] There are few reports on the separation of chloropropene-chloropropane in the prior art

Method used

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  • Method for separating chloropropene and chloropropane
  • Method for separating chloropropene and chloropropane
  • Method for separating chloropropene and chloropropane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] A 1000mL stainless steel pressure tank is filled with 300g of chloropropene containing 3% chloropropane, and the tank is heated to 80°C. The chloropropene gas enters the fixed bed reactor (the inner diameter of the tube is 3cm and the length is 80cm) from the gas phase pipeline at the top. The upper part is equipped with a 50cm catalyst bed, using 2% zinc chloride / barium chloride loaded activated carbon catalyst, according to the weight hourly space velocity of 1.5h -1 , Dehydrochlorination reaction occurs at 100°C. The reaction liquid flows from the bottom of the reactor to the extraction tank, the temperature of the jacket of the extraction tank is -5°C, and the generated propylene overflows from the gas phase of the extraction tank to the absorption tank; the absorption tank is filled with 300g of ethanol for absorbing propylene, and the jacket of the absorption tank The temperature is about -20°C; the material in the production tank is transferred to the stratifier,...

Embodiment 2

[0021] A 1000mL stainless steel pressure tank is filled with 350g of chloropropene containing 1.5% chloropropane, and the tank is heated to 70°C. The chloropropene gas enters the fixed-bed reactor (the inner diameter of the tube is 3cm and the length is 80cm) from the top gas phase pipeline. The upper part is equipped with a 45cm catalyst bed, using 1.5% cerium chloride supported silica catalyst, according to the weight hourly space velocity of 2.0h -1 , Dehydrochlorination reaction occurs at 110°C. The reaction liquid flows from the bottom of the reactor to the extraction tank, the temperature of the jacket of the extraction tank is -5°C, and the generated propylene overflows from the gas phase of the extraction tank to the absorption tank; the absorption tank is filled with 300g of ethanol for absorbing propylene, and the jacket of the absorption tank The temperature is about -20°C; the material in the production tank is transferred to the stratifier, and 200g of water is ad...

Embodiment 3

[0023] A 1000mL stainless steel pressure tank is filled with 385g of chloropropene containing 1.3% chloropropane, and the tank is heated to 90°C. The chloropropene gas enters the fixed-bed reactor (tube inner diameter 3cm, length 80cm) from the top gas phase pipeline, and the center of the reactor The upper part is equipped with a 40cm catalyst bed, using 0.8% magnesium chloride / zinc chloride supported titanium dioxide catalyst, according to the weight hourly space velocity of 2.4h -1 , Dehydrochlorination reaction occurs at 95°C. The reaction liquid flows from the bottom of the reactor to the extraction tank, the temperature of the jacket of the extraction tank is -5°C, and the generated propylene overflows from the gas phase of the extraction tank to the absorption tank; the absorption tank is filled with 300g of ethanol for absorbing propylene, and the jacket of the absorption tank The temperature is about -20°C; the material in the production tank is transferred to the lay...

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Abstract

The invention provides a method for purifying chloropropene: propylene is generated through chloropropane gas-phase dehydrochlorination, so that purification of chloropropene is completed. The methodis simple to operate and good in purification effect, the chloropropene content can reach 99.8% or above, and the method has good application value.

Description

technical field [0001] The invention relates to a method for purifying allyl chloride. Specifically, a small amount of chloropropane contained in the recovered chloropropene is removed. Background technique [0002] Allyl chloride is a colorless and flammable liquid with a corrosive and pungent smell; it is slightly soluble in water, miscible with ethanol, chloroform, ether and petroleum ether, and can be used to produce epichlorohydrin, propenyl alcohol, glycerin, etc. Chloropropene is used as raw material for direct epoxidation to produce epichlorohydrin, which contains a small amount of chloropropane. Chloropropane does not directly participate in the reaction, but it will be continuously enriched in the recovery of chloropropene, which will affect the quality of the raw material chloropropene. Propane is separated from allyl chloride. The boiling point of chloropropene is 43°C, and that of chloropropane is 46°C. The boiling points of the two are close, and it is diffic...

Claims

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Application Information

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IPC IPC(8): C07C17/25C07C21/067C07C17/38
CPCC07C17/25C07C17/38C07C21/067
Inventor 孙诚徐林丁克鸿李明吕丽邓小伟
Owner JIANGSU YANGNONG CHEM GROUP
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