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Method of resource utilization of epichlorohydrin wastewater

A technology of epichlorohydrin and resource utilization, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc. It can solve the problems of large solvent loss, large steam volume, and high cost, so as to reduce energy consumption and enhance the economy The effect of safety and simple process

Active Publication Date: 2020-02-04
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing problems: Monochloropropanediol in wastewater is concentrated using traditional distillation schemes, resulting in a large amount of steam and high energy consumption
[0007] Patent CN109456289A is a method for resource utilization of epoxy resin key intermediate epichlorohydrin production waste water, using Zn, Fe, Cu or Ag modified granular activated carbon as adsorbent to absorb monochloropropanediol in waste water, and then using Desorption of low boiling point solvents such as dichloromethane, acetone, etc., the solvent loss is large and the cost is high

Method used

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  • Method of resource utilization of epichlorohydrin wastewater
  • Method of resource utilization of epichlorohydrin wastewater

Examples

Experimental program
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Effect test

example 1

[0036] The epichlorohydrin wastewater enters the stripping tower. The stripping tower is set to 95°C and the negative pressure is -0.025MPa for stripping. The output enters the oil-water separator, the oil layer is recovered, and the water layer is returned to the stripping tower kettle and the top of the stripping tower Under the condition that the distillate amount is 9.0% of the input tower amount, the COD of the stripper water is 40180ppm, epichlorohydrin is not detected, and the content of monochloropropanediol is 2.5%.

[0037] Will be 800cm 3 The strong acid styrene-based ion exchange resin is charged into a reaction extraction tower with an inner diameter of 50mm and a length of 800mm. The epichlorohydrin stripping kettle water is used for 0.2h -1 Space velocity, enter from the upper part of the reaction extraction tower, enter from the lower part of the extraction tower as reactant and ethylbenzene as the extractant, the molar ratio of propionaldehyde to monochloropropaned...

example 2、3、4

[0042] Adjust the water space velocity of the stripper on the basis of Example 1, and adjust the space velocity to 0.5h respectively -1 , 1.0h -1 And 2.0h -1 , Other conditions remain unchanged, the conversion rate of monochloropropanediol and the total yield of monochloropropanediol and dichloropropanol are shown in Table 1.

[0043] Table 1

[0044] NumberingAirspeed (h -1 )

example 5、6、7

[0046] On the basis of Example 2, xylene, chlorobenzene, and 1,2,3-trichloropropane were selected as extractants, and other conditions were unchanged. The extraction recovery rate and the total yield of monochloropropanediol and dichloropropanol are shown in Table 2. .

[0047] Table 2

[0048] Numbering Extracting agent Extraction recovery rate (%) Total yield (%) Example 5 Xylene99.594.7 Example 6 chlorobenzene99.895.0 Example 7 1,2,3-Trichloropropane99.394.5

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Abstract

The invention provides a method for treating epichlorohydrin wastewater. The method comprises the working procedures of steam stripping, reaction extraction, rectification, hydrolysis rectification and the like, and monochloropropanediol in wastewater and can be effectively recovered. According to the invention, energy consumption in the process is reduced by adopting a reaction extraction method,and an extracting agent and a reaction agent in an extraction reaction process can be recycled, so that resource utilization is realized, and economy is enhanced. The whole process flow is simple, iseasy for industrial implementation, and has a wide application prospect.

Description

Technical field [0001] The invention belongs to wastewater treatment technology in the field of environmental protection, and specifically relates to a method for recycling organic matter in epichlorohydrin wastewater to realize the resource utilization of wastewater. Background technique [0002] Epichlorohydrin is an unstable, volatile, colorless oily liquid, slightly soluble in water. As an important chemical raw material, it is mainly used in the manufacture of epoxy resin, and is also the main raw material of nitroglycerin explosives, FRP, and electrical insulation products. At present, propylene chlorination is mainly used in industry. Propylene and chlorine are chlorinated at high temperature to obtain propylene chloride, and then hypochlorous acid is used to prepare dichloropropanol, and saponification to obtain epichlorohydrin. However, this process produces a large amount of salty wastewater. The environmental pollution is serious and has been included in the high envi...

Claims

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Application Information

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IPC IPC(8): C07C29/10C07C29/64C07C29/86C07C29/80C07C31/42C07D317/16
CPCC07C29/103C07C29/64C07C29/86C07C29/80C07D317/16C07C31/42C07C31/36
Inventor 徐林丁克鸿杨树斌王怡明宋洋王丹徐高明姜欣宇张婷王再飞
Owner JIANGSU YANGNONG CHEM GROUP
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