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Method for producing epoxy chloropropane

A technology of epichlorohydrin and dichloropropanol, which is applied in organic chemistry and other fields, can solve problems such as leakage, saponification wastewater residual pollution, and increased equipment investment

Active Publication Date: 2014-04-09
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The extraction method requires additional solvents, and more equipment is invested. It is necessary to increase equipment such as multi-stage extraction towers, and the extraction process needs to be equipped with a series of equipment such as extractant distillation and separation towers, which increases equipment investment; Contaminated liquids such as chlorinated alkanes, esters, ethers, etc. are easy to leak during the production process, resulting in residual pollution in saponification wastewater or low boiling substances, which increases the cost of production

Method used

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  • Method for producing epoxy chloropropane

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Embodiment 1

[0034] The present invention will be described in detail below in conjunction with the drawings and specific embodiments, but the drawings and specific embodiments do not constitute a limitation to the present invention. The process includes the steps of glycerin chlorination, dichloropropanol hydrogen chloride aqueous solution separation, hydrogen chloride compression, dichloropropanol saponification, epichlorohydrin refining and other steps.

[0035] (1) Glycerin chlorination liquid 95% by weight of refined glycerin is sent from the tank area to the chlorination reactor. At the same time, the catalyst storage tank is mixed with a certain amount of glycerin according to the metering and then sent to the swirl plate reactor for glycerin chlorination. The flow of hydrogen chloride is passed The flow rate of glycerin and glycerin is controlled by flow meter and regulating valve respectively to ensure the flow ratio and distribution of the reactor into the reactor. The gas raw ma...

Embodiment 2

[0051] The present invention will be described in detail below in conjunction with the drawings and specific embodiments, but the drawings and specific embodiments do not constitute a limitation to the present invention. The process includes the steps of glycerin chlorination, dichloropropanol hydrogen chloride aqueous solution separation, hydrogen chloride compression, dichloropropanol saponification, epichlorohydrin refining and other steps.

[0052] (1) Glycerin Chlorination

[0053] The liquid 95% by weight refined glycerol is sent from the tank area to the chlorination reactor, and at the same time, the catalyst storage tank is mixed with a certain amount of glycerin according to the metering and then sent to the bubble column reactor for glycerin chlorination. The flow of hydrogen chloride is matched with the flow of glycerin. The ratio is controlled by the flow meter and the regulating valve respectively to ensure that the flow ratio and distribution into the reactor ar...

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Abstract

The invention provides a method for producing epoxy chloropropane. The method comprises the following steps of chlorination of glycerin, separation of a dichloropropanol-hydrogen chloride aqueous solution, compression of hydrogen chloride, and purification of dichloropropanol saponification and epoxy chloropropane. A dichloropropanol oil phase is decanted and layered through the separation of the dichloropropanol-hydrogen chloride aqueous solution and directly enters the saponification step; gas-phase hydrogen chloride escaped during the separation of the dichloropropanol-hydrogen chloride aqueous solution is pressurized and introduced into a reactor; and hydrogen chloride is subjected to filtration and washing operations, so that the content of water and impurities in hydrogen chloride raw material is reduced; and selective scope of the hydrogen chloride compressor is broadened. The method is advantaged by guaranteeing that volume space velocity of the reactor is not smaller than 0.1; conversion rate of glycerin is not lower than 98% and selectivity for dichloropropanol is not lower than 99%, by optimizing a catalyst proportion, a reaction pressure and reaction temperature during the chlorination of glycerin.

Description

technical field [0001] The invention belongs to the production field of epichlorohydrin and dichloropropanol, in particular to a method for producing epichlorohydrin by a glycerol method. Background technique [0002] Epichlorohydrin (alias epichlorohydrin), the chemical name is 1-chloro-2,3-epoxypropane, and the molecular formula is C 3 h 5 OCl, with a boiling point of 115.2°C and a freezing point of -57.2°C, is a volatile and unstable colorless liquid, slightly soluble in water and miscible with various organic solvents. [0003] Epichlorohydrin is an important organic chemical raw material and fine chemical product. It is a large variety of propylene derivatives. It is mainly used in the synthesis of glycerin, epoxy resin, epichlorohydrin rubber, nitroglycerin explosives, etc. It can also be used It is used as a solvent for cellulose esters, resins and cellulose ethers; it is also the main raw material for the production of surfactants, plasticizers, stabilizers, adhesi...

Claims

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Application Information

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IPC IPC(8): C07D303/08C07D301/26C07D301/32
CPCC07D301/26C07D301/32C07D303/08
Inventor 杨克俭赵敏伟李荣梁军湘屈阁赵斌赵丽丽兰杰闫伟
Owner CHINA TIANCHEN ENG
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