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Device and method for separating and purifying by-products in epichlorohydrin wastewater

A technology for epichlorohydrin and by-products is applied in the field of devices for separating and purifying by-products in epichlorohydrin wastewater, which can solve the problems of inability to achieve resource utilization and high treatment costs, and achieve resource utilization, The effect of low energy consumption and long service life

Active Publication Date: 2021-02-19
JIANGSU YANGNONG CHEM GROUP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, in the prior art, there are still problems in the treatment of epichlorohydrin wastewater, such as high treatment costs and inability to better realize resource utilization.

Method used

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  • Device and method for separating and purifying by-products in epichlorohydrin wastewater
  • Device and method for separating and purifying by-products in epichlorohydrin wastewater
  • Device and method for separating and purifying by-products in epichlorohydrin wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] This embodiment provides a device for separating and purifying by-products in epichlorohydrin wastewater, such as figure 2As shown, the device includes an extraction unit, a dehydration unit, a solvent recovery unit and a rectification unit connected in sequence; the device also includes an azeotrope unit, a membrane concentration unit and an evaporation unit 8 connected in sequence with the extraction unit.

[0094] The extraction unit includes an extraction tower 1; the dehydration unit includes a dehydration tower 2; the top of the dehydration tower 2 is provided with a first phase separation device 21; the first phase separation device 21 includes a dehydration oil layer outlet and a dehydration water layer outlet The dehydration oil layer outlet is connected to the dehydration tower 2; the dehydration water layer outlet is connected to the azeotropic unit; the solvent recovery unit includes a solvent recovery tower 3; the rectification unit includes a rectification...

Embodiment 2～5

[0106] On the basis of Example 1, isobutanol, anisole, n-butyl acetate, and dichloromethane were respectively selected as extraction agents, and the test results are shown in Table 1.

[0107] Table 1

[0108]

Embodiment 6～10

[0110] On the basis of Example 1, the weight ratios of the extractant to the adjusted wastewater were 0.1:1, 0.3:1, 0.5:1, 0.05:1 and 1:1, respectively. The test results are shown in Table 2.

[0111] Table 2

[0112]

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PUM

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Abstract

The invention provides a device for separating and purifying by-products in epichlorohydrin wastewater. The device comprises an extraction unit, a dehydration unit, a solvent recovery unit and a rectification unit which are connected in sequence. The device further comprises an azeotropic unit, a membrane concentration unit and an evaporation unit which are sequentially connected with the extraction unit. Separation, purification and resource recovery of by-products in the epichlorohydrin wastewater can be effectively achieved through a series of working sections such as combined extraction, rectification, membrane concentration and evaporation. The method using the device can effectively separate water and organic matters, realizes recovery, separation and purification of chlorohydrin ether and propylene glycol monochloride in wastewater, realizes up-to-standard discharge of effluent, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a device and method for separating and purifying by-products in epichlorohydrin wastewater. Background technique [0002] Epichlorohydrin is a volatile and unstable colorless oily liquid, slightly soluble in water, mainly used in the manufacture of epoxy resins, and is also the main raw material for epoxy and phenoxy resins. At present, the production process of epichlorohydrin is mainly chlorohydrin method and glycerin method. The chlorohydrin method has a large amount of wastewater and serious environmental pollution, and is a restricted process. The glycerol method is limited by the supply of glycerin, and it is difficult to continue to increase production capacity, which cannot meet the growing demand. In this context, using allyl chloride as the raw material and hydrogen peroxide as the oxidant to prepare epichlorohydrin by catalytic epoxidation, due to the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C29/76C07C31/34C07C41/34C07C43/02C02F101/36C02F101/34
CPCC02F9/00C07C29/76C07C41/34C02F1/26C02F1/04C02F1/447C02F2101/36C02F2101/34C07C31/34C07C43/02Y02A20/131
Inventor 徐林丁克鸿王丹杨树斌王怡明徐高明王再飞王建昌
Owner JIANGSU YANGNONG CHEM GROUP
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