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Method for purifying epoxy chloropropane

A technology of epichlorohydrin and side line, which is applied in the field of epichlorohydrin purification, which can solve the problems of high water content and light components of raw crude epichlorohydrin, low purity of epichlorohydrin, etc., and achieve energy consumption Decrease, reduce the effect of demanding requirements

Inactive Publication Date: 2013-02-27
CHANGZHOU UNIV
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  • Claims
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Problems solved by technology

[0010] In order to overcome the shortcomings of low purity of epichlorohydrin in the prior art and strict requirements on the water content and light components of crude epichlorohydrin in the feed, the present invention proposes a new method for preparing high-purity epichlorohydrin finished products from refined epichlorohydrin

Method used

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  • Method for purifying epoxy chloropropane
  • Method for purifying epoxy chloropropane

Examples

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Embodiment 1

[0019] The finished tower adopts structured packing tower, filled with stainless steel corrugated packing (equivalent to 4 theoretical plates / m). The full column has 40 theoretical plates. A liquid phase sideline extraction outlet is set at the 12th theoretical plate downward from the reflux port on the top of the tower, and the tower feed port is located at the 25th theoretical plate.

[0020] The finished product tower feed (from the dehydration tower kettle) is 1500kg / h, which contains 98.6% of epichlorohydrin, 0.1% of water, 0.01% of light components, and 1.29% of heavy components. The operating pressure at the top of the control tower is -56KPa (gauge pressure), the temperature is 90°C, and the reflux ratio is 3.5. The output at the top of the tower is 92.4kg / h, which contains 1.5% water, 0.16% light components, and 98.35% epichlorohydrin, which is sent to the top of the dehydration tower. The finished epichlorohydrin produced from the side line liquid phase is 1380kg / h...

Embodiment 2

[0023] The finished tower adopts the guided valve tower, and there are 55 guided valve trays in the whole tower (equivalent to 25 theoretical plates). From the top reflux port to the bottom of the 20th plate (equivalent to the 9th theoretical plate) there is a liquid phase side line extraction outlet, and the 45th plate (equivalent to the 20th theoretical plate) is the tower feed port.

[0024] The finished product tower feed (from the dehydration tower kettle) is 1500kg / h, which contains 98.6% of epichlorohydrin, 0.1% of water, 0.01% of light components, and 1.29% of heavy components. The operating pressure at the top of the control tower is -91KPa (gauge pressure), the temperature is 50°C, and the reflux ratio is 3.0. The output at the top of the tower is 124.2 kg / h, of which 1.127% water, 0.121% light components and 98.753% epichlorohydrin are sent to the top of the dehydration tower. The finished epichlorohydrin produced from the side line liquid phase is 1350kg / h, which ...

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Abstract

The invention relates to a method for purifying epoxy chloropropane, in particular to a refining method for preparing high-purity epoxy chloropropane. A rectifying tower with a side liquid-phase extraction function is used as a finished product tower for refining the epoxy chloropropane, and finished epoxy chloropropane is extracted from a rectifying section in a side liquid-phase manner. Tower top distillate contains more water and light components and is conveyed to a dehydrating tower top, and heavy components are discharged from a tower pot. The finished product tower with the side liquid-phase extraction function is used for replacing a conventional tower, on one hand, harsh requirements of the finished product tower on water content and light components of feed are lowered, so that energy consumption in the refining process of the epoxy chloropropane is reduced; and on the other hand, the high-purity (99.99%) finished epoxy chloropropane is easily obtained by extracting the epoxy chloropropane in the side liquid-phase manner.

Description

technical background [0001] Epichlorohydrin is a basic chemical widely used in the production of epoxy resins, pesticides, pharmaceuticals and other chemicals. [0002] The global annual output of epichlorohydrin is about 2 million tons, and most of the production capacity is based on the technical route of high-temperature chlorination of propylene developed by Shell in 1948. In recent years, glycerin-based epichlorohydrin technology has begun to be industrialized, but research and development have focused on the process of glycerol chlorination to synthesize dichlorohydrin, while dichlorohydrin saponification and epichlorohydrin refining technology are still based on the traditional propylene method. : Dichlorohydrin is saponified to obtain crude epichlorohydrin, and the crude epichlorohydrin is sent to the dehydration tower, and the water and light component impurities are separated from the top of the dehydration tower, and then the liquid in the dehydration tower is sent ...

Claims

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Application Information

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IPC IPC(8): C07D303/08C07D301/32
Inventor 单玉华巫丽君蒋晓丽董帅帅毛翠霞徐文杰
Owner CHANGZHOU UNIV
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