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A method for resource utilization of epichlorohydrin waste water

A technology of epichlorohydrin and recycling, which is applied in chemical instruments and methods, water pollutants, natural water treatment, etc. It can solve the problems of high temperature and high pressure in the wet oxidation process, the inability to recycle organic matter, and high requirements for equipment materials to achieve the treatment effect. Stable and reliable, easy for industrial implementation, and the effect of reducing COD content

Active Publication Date: 2022-02-18
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology cannot recover organic matter in wastewater, and the wet oxidation process requires high temperature and high pressure, high equipment material requirements, and large investment

Method used

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  • A method for resource utilization of epichlorohydrin waste water
  • A method for resource utilization of epichlorohydrin waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Stripping

[0033] The epichlorohydrin waste water enters the stripper after preheating. Under the conditions of the operating temperature of the stripper at 95-105°C, a slight negative pressure of -0.025Mpa, and a theoretical plate number of 10, the stripped material enters the oil-water stratifier , the oil layer is recovered, the water layer is returned to the stripper kettle, and the overhead distillation amount of the stripper is under the condition of 7.0% of the inlet amount, the water COD of the stripper still kettle is 42710ppm, epichlorohydrin is not detected, and monochloropropanediol is 3.1% .

[0034] (2) reverse osmosis concentration

[0035] The water in the stripping tower is cooled to 25-35°C, and filtered through a precision filter to remove mechanical impurities. After filtration, it is sent to the reverse osmosis membrane concentration device through a booster pump. Water COD2780ppm, monochloropropanediol 0.15%, monochloropropanediol content in...

Embodiment 2

[0042] On the basis of Example 1, the pressure of the reverse osmosis concentration process is reduced to 3.0MPa, and the product water COD1765ppm, 0.09% of monochloropropanediol, and 15.0% of monochloropropanediol in the reverse osmosis membrane dope are further concentrated to more than 50% to prepare epoxy chlorine propane. The reverse osmosis product water enters the resin adsorption tower at a rate of 1BV / h, the effluent COD is 80ppm, monochloropropanediol is not detected, and pH=7.0, which meets the discharge requirements. The resin is saturated with about 100BV of water inflow, and is regenerated with hot water at 60-80°C, and the total yield of monochloropropanediol is 99.95%.

Embodiment 3

[0044] Improve reverse osmosis concentration process pressure to 5.0MPa on the basis of example 1, obtain product water COD3290ppm, monochloropropanediol 0.20%, monochloropropanediol 30.0% in reverse osmosis membrane dope, further concentrate to more than 50% to prepare epichlorohydrin . The reverse osmosis product water enters the resin adsorption tower at a rate of 1BV / h, the effluent COD is 95ppm, monochloropropanediol is not detected, and pH=7.0, which meets the discharge requirements. The resin is saturated when the influent reaches about 45BV, and it is regenerated with hot water at 60-80°C, and the total yield of monochloropropanediol is 99.93%.

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Abstract

The invention provides a resource treatment scheme for epichlorohydrin wastewater, which can effectively separate water and organic matter through the processes of stripping, oil-water stratification, filtration, reverse osmosis membrane device concentration, resin adsorption, and resin regeneration, and realize the recycling of wastewater. Oxychloropropane and monochloropropanediol are recovered, and the effluent is discharged up to the standard, with broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment technology, and in particular relates to a method for recovering organic matter in epichlorohydrin waste water to realize waste water resource utilization. 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 epichlor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/30C02F103/36
CPCC02F9/00C02F2101/30C02F2103/36C02F1/02C02F1/10C02F1/20C02F1/001C02F1/42C02F1/441C02F2301/08C02F1/28C02F2209/08
Inventor 徐林丁克鸿杨树斌王怡明王丹徐高明訾广平
Owner JIANGSU YANGNONG CHEM GROUP
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