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Environment friendly preparation process for producing propylene oxide through complexation extraction

A technology for the preparation of propylene oxide, which is applied in the direction of organic chemistry, can solve the problems of unrealized industrialization and a large amount of salty wastewater, and achieve the effects of easy industrial automation control, simple process and low investment

Inactive Publication Date: 2010-08-18
王在军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This law reduces pollution and is conducive to energy saving. This law has been reported for more than 20 years, but it has been in the research stage and has not realized industrialization.
[0026] To sum up, at present, the relatively mature production methods at home and abroad are only the chloroalcoholation method and the hydroperoxidation method, and the chloroalcoholation method is widely used by manufacturers because of its simple process, easy automatic control, safe production, and low operating cost. The disadvantage of the method is that a large amount of saline wastewater is produced during production (about 40-60 tons of wastewater per ton of product)
Therefore, if the wastewater pollution problem of the chlorohydrinization method can be solved, this method is still a simple and easy process route.

Method used

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  • Environment friendly preparation process for producing propylene oxide through complexation extraction
  • Environment friendly preparation process for producing propylene oxide through complexation extraction
  • Environment friendly preparation process for producing propylene oxide through complexation extraction

Examples

Experimental program
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Effect test

Embodiment 1

[0038] An environment-friendly preparation process for producing propylene oxide by complex extraction, comprising the steps of:

[0039] (1) The monochloropropanol solution obtained by the traditional process, with a complex extraction agent (n-dodecane: N 235 : n-octanol volume ratio 5: 3: 2) to extract, its volume ratio is monochloropropanol solution: complex extractant=5: 3, three-stage extraction, monochloropropanol extraction rate is 95%, HCl The extraction rate is 98%, and the HCl content in the solution after extraction is 0.083%;

[0040] (2) The remaining chlorohydrination mother liquor after extraction is returned to the chlorohydrination reaction system, and the chlorohydrination reaction is not affected;

[0041] (3) The complex extract containing HCl and monochloropropanol is saponified with 20% (wt%) milk of lime (causing the residual alkali content of the mother liquor discharged from the bottom of the tower <0.5%); the crude propylene oxide is generated and o...

Embodiment 2

[0044] N in Example 1 235 Change trioctylamine into, n-dodecane: trioctylamine: n-octanol volume ratio is 1: 3: 2; One chloropropanol solution: complex extraction agent=5: 1 Its operating procedure is the same as embodiment 1, the result Basically consistent with embodiment 1.

Embodiment 3

[0046] Change the n-dodecane in Example 1 into n-decane, n-decane: tribenzylamine: n-octanol volume ratio is 10: 3: 2; monochloropropanol solution: complex extraction agent=1: 1 Other operation steps are with embodiment 1, and result is basically consistent with embodiment 1.

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Abstract

The invention discloses an environment friendly preparation process for producing propylene oxide through complexing extraction. The preparation process comprises the following steps: adding complexing extractant to propylene chlorohydrins solution to extract hydrochloric acid (HCl) and propylene chlorohydrins from the solution at one time; returning the extracted reaction liquid to a chlorohydrination system; and further saponifying the complexing extract liquid containing hydrochloric acid and propylene chlorohydrins by lime milk, liquid caustic soda or sodium carbonate to generate the propylene oxide, wherein the raffinate at the bottom of a saponificaiton column is calcium chloride (or sodium chloride if liquid caustic soda or sodium carbonate is adopted in saponificaiton) solution with the content thereof being 30%-40%, the calcium chloride is produced through multiple-effect evaporation, and the concentrated water is used for preparing the lime milk. Accordingly, the entire production procedure avoids discharging the process wastewater; and the preparation process is simple, easy to conduct continuous operation and capable of improving the original production device.

Description

technical field [0001] The invention relates to a preparation method of propylene oxide, belonging to the technical field of fine chemicals. Background technique [0002] Propylene oxide is an important organic chemical raw material and fine chemical product. It can produce propylene glycol, propylene alcohol, polyether polyol and other raw materials. It is also the main raw material for the production of polyurethane foam plastics. It can also be used for synthetic rubber to produce non-ionic surfactants, wetting agents, emulsifiers, detergents, etc. It can also be used in the production of fungicides, fumigants, stabilizers, etc. [0003] At present, the production process of propylene oxide mainly includes the following types: [0004] 1. Chlorohydrination method: [0005] [0006] This method is currently the main method used at home and abroad. [0007] 2. Hydroperoxide method: [0008] Also known as indirect oxidation method, the main process is to oxidize prop...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/26C07D301/32
Inventor 王在军郑仁史骞侯伟波林国栋王允娇杜彦丽
Owner 王在军
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