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Method and system thereof for synthesizing epoxy chloropropane by dichloropropanol

A technology of epichlorohydrin and dichloropropanol, which is applied in the direction of organic chemistry, can solve the problems of difficult saponification wastewater, slow material flow, regular parking and cleaning, etc., so as to avoid parking and cleaning operations, reduce the amount of saponification waste liquid, The effect of easy recycling

Active Publication Date: 2013-04-03
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both salt and epoxy compounds have a killing effect on microorganisms, so the saponification wastewater generated in the production process of epoxy compounds is difficult to treat with biochemical degradation methods
[0007] Due to a large amount of saponification, the resulting salt concentration is low, so it is difficult to reprocess and recycle
The flow of materials in the tower saponification process is slow, and the generated epichlorohydrin is prone to side reactions, resulting in a yield of only 85-90%.
In addition, the generated salt is easy to scale on the saponification tray, so it must be stopped and cleaned regularly

Method used

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  • Method and system thereof for synthesizing epoxy chloropropane by dichloropropanol

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Effect test

Embodiment 1

[0033] The external circulation pump 4 of the indirect heating circulation injection saponification reactor is a centrifugal pump. A section of structured packing is built in the upper part of the kettle body 6, and the number of theoretical plates is 8. Six sieve plates 8 are built in the middle part of the kettle body 6, and the heating medium in the saponified liquid heating tube 10 at the lower part of the kettle body 6 is water vapor. The temperature in the control kettle is 45°C, and the operating pressure is -95KPa (gauge pressure).

[0034] Add 395 kg / h of 98% dichlorohydrin produced by glycerin chlorination, 300 kg / h of 42% caustic soda, 59 kg / h of recycled water and circulating saponification solution into the feed port 3, and circulate through the external The pump 4 makes dichlorohydrin and lye mix and react quickly and sprays into the kettle body 6 of the circulating injection saponification reactor, and the epichlorohydrin and water generated are heated in the k...

Embodiment 2

[0040] The external circulation pump 4 of the indirect heating circulation injection saponification reactor is a screw pump. A section of structured packing is built in the upper part of the kettle body 6, and the number of theoretical plates is 4. Ten sieve plates 8 are built in the middle part of the kettle body 6, and the heating medium in the saponified liquid heating tube 10 in the lower part of the kettle body 6 is heat conduction oil. The temperature in the control kettle is 80°C, and the operating pressure is -15KPa (gauge pressure).

[0041] Lime slurry formed by mixing slaked lime (with a density of 2.5Kg / L before dissolution) at 180kg / h and recycled water at 360kg / h, and dichlorohydrin with a content of 20% produced by the propylene method at 1935kg / h, and recycling The saponification liquid is added to the feed port 3 together, and the dichlorohydrin and the lye are rapidly mixed and reacted through the external circulation pump 4 and sprayed into the kettle body ...

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Abstract

The invention provides a method and a system of the method for synthesizing epoxy chloropropane by dichloropropanol. By utilizing the method and the system, the defect that a large number of wastewater is generated by a steam direct heating steam stripping saponification method is overcome. The method comprises the following steps that: an indirect heating circulation injection saponification reactor is adopted; dichlorohydrin, alkali and circulation saponification liquid enter a kettle body through an outer circulation pump for cyclization reaction to generate the epoxy chloropropane; azeotrope formed by the generated epoxy chloropropane and water is instantly steamed from the top of the kettle body; the azeotrope enters into an oil-water separator after being condensed as an oil layer is crude epoxy chloropropane; a part of a water layer flows back to the saponification reactor; a part of the water layer enters into a water-phase steam stripping tower; the epoxy chloropropane flowing out from the top of the steam stripping tower is subjected to heat exchange with the saponification liquid for condensing; the epoxy chloropropane flows back to the oil-water separator after being condensed so as to recover the epoxy chloropropane in water phase; steam stripping tower residual liquid of the epoxy chloropropane is removed, wherein a part of the residual liquid is used for preparing alkali liquid and a part of the residual liquid is discharged; and salty mud generated in the kettle body is settled to a swinging filter machine from the bottom of saponification reactor, wherein filter residue is recovery salt, and filter liquid is saponification waste liquid.

Description

technical field [0001] The invention belongs to a cyclization method of chlorohydrins, in particular to a method and a system for synthesizing epichlorohydrin by saponification reaction of dichloropropanol and alkali. Background technique [0002] Epichlorohydrin is an important basic chemical raw material and organic synthesis intermediate, mainly used in the production of epoxy resin, surfactant, medicine, pesticide, ion exchange resin, etc. Epichlorohydrin is mainly prepared by saponification reaction of corresponding dichlorohydrin and alkali. However, no matter caustic soda or lime is used as alkali source, stoichiometric sodium chloride and calcium chloride will be produced during saponification. [0003] At present, the production method widely used in industry is direct steam heating stripping saponification method, that is, water vapor is directly passed into the saponification liquid from the saponification tower kettle, and the heat transfer efficiency is high, b...

Claims

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Application Information

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IPC IPC(8): C07D301/26C07D303/08
Inventor 单玉华巫丽君蒋晓丽徐文杰董帅帅张聪
Owner CHANGZHOU UNIV
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