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Method for treating wastewater produced by ammoximation process for caprolactam

A technology of caprolactam amidoxime and production wastewater, which is applied in the fields of special compound water treatment, water/sewage treatment, natural water treatment, etc., can solve the problems of complicated operation and high equipment investment, reduce consumption, reduce investment and operating costs, reduce Effects of biochemical stress

Pending Publication Date: 2019-01-15
SUNRESIN NEW METERIALS CO LTD XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the utilization efficiency of the oxidant, save the treatment cost, and meet the discharge standard of the treated wastewater, it needs to use a special enhanced mass transfer oxidation reactor and MBR biofilm reactor, and the oxidation reaction environment is limited to a specific pH condition Under the circumstances, the equipment investment is too high and the operation is complicated

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  • Method for treating wastewater produced by ammoximation process for caprolactam
  • Method for treating wastewater produced by ammoximation process for caprolactam

Examples

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Effect test

Embodiment 1

[0022] The waste water of caprolactam ammoximation production process in a chemical enterprise has a COD of 2800 mg / L and a pH of 2.0 after oxidation by the Fenton method.

[0023] The caprolactam ammoximation production process wastewater is processed according to the following steps:

[0024] 1) Caprolactam ammoximation production wastewater with 5m 3 / h flow rate, enter the adsorption column filled with styrene-based macroporous adsorption resin (XDA-1G, produced by Xi'an Lanxiao Technology New Materials Co., Ltd.) (adsorption column specification: ￠1200*3000mm, filling volume 2.5 cubic meters) ; The organic matter in the caprolactam ammoximation production wastewater is removed by the functional polymer adsorption material. After 20 hours of operation, the COD of the effluent is greater than 300mg / L, and the adsorption is stopped.

[0025] 2) After the adsorption is completed, pass through 70% w / w ethanol solution for elution, the performance of the resin is restored, and...

Embodiment 2

[0027] The caprolactam ammoximation production process wastewater of a chemical company has a COD of 5000 mg / L and a pH of 5.0.

[0028] The caprolactam ammoximation production process wastewater is processed according to the following steps:

[0029] 1) Caprolactam ammoximation production wastewater with 10m 3 / h flow rate, enter the adsorption column filled with styrene-based macroporous adsorption resin (XDA-200, produced by Xi'an Lanxiao Technology New Materials Co., Ltd.) (the specification of the adsorption column: ￠2000*5000mm, the filling volume is 12 cubic meters. There are three resin columns in total, two in series and one in standby); the organic matter in the caprolactam ammoximation production wastewater is removed by the functional polymer adsorption material, and after 12 hours of operation, the first column stops the adsorption. The second and third columns are connected in series for adsorption and the first column for elution.

[0030] 2) After the adsorpt...

Embodiment 3

[0032] The caprolactam ammoximation production process wastewater of a chemical company has a COD of 3500 mg / L and a pH of 1.5 after oxidation by the Fenton method.

[0033] The caprolactam ammoximation production process wastewater is processed according to the following steps:

[0034] Caprolactam ammoximation production waste water with 120m 3 / h flow rate, enter the continuous ion exchange device filled with styrene macroporous adsorption resin (XDA-1, Xi'an Lanxiao Technology New Materials Co., Ltd.) (adsorption column specification: ￠1600*1700mm, single column packing volume 2.6 Cubic meters, 20 columns, divided into different areas to realize the simultaneous operation of adsorption and elution processes, and realize the continuous operation of valve switching through automatic control. Its use principle refers to the authorized patent applied by Lanxiao Technology, patent publication number CN202516562U); caprolactam Ammoximation production wastewater passes through t...

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Abstract

The invention provides a method for treating wastewater produced by an ammoximation process for caprolactam. According to the method, a functional polymer adsorbent material is uses for removing organic matters in wastewater, and then the adsorption performance of the functional polymer adsorbent material is recovered via a certain solution; after the wastewater is adsorbed by the functional polymer adsorbent material, some organic substances difficult to treat, e.g., cyclohexanone oxime, are adsorbed onto the functional polymer adsorbent material, so the biodegradability pressure of the wastewater is greatly reduced, and the requirements of subsequent biochemical treatment are met; the functional polymer adsorbent material can be used repeatedly; and the use of a continuous ion exchange process can greatly improve the use efficiency of the material, reduce the consumption of an eluent and other materials and significantly lower investment and operating cost.

Description

technical field [0001] The invention relates to the technical field of production wastewater treatment methods, in particular to a treatment method for production wastewater in a caprolactam ammoximation process. Background technique [0002] Caprolactam is an important monomer for the production of nylon-6 fiber (nylon) and nylon-6 engineering plastics. It is widely used in the preparation of nylon fibers, engineering plastics, and plastic films. The preparation method is to use hydrogen peroxide, liquid ammonia, and cyclohexanone as raw materials. , one-step reaction directly generates cyclohexanone oxime, and produces caprolactam under the action of oleum. Caprolactam production sewage has always been one of the difficult production sewage in the petrochemical industry, especially the ammonia oximation unit sewage. The main pollutants are cyclohexane, cyclohexanone, cyclohexanol, cyclohexanone oxime, ammonia nitrogen, etc. The process section has a large amount of water,...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/30C02F103/36
CPCC02F1/285C02F1/42C02F1/66C02F1/722C02F9/00C02F2001/422C02F2001/425C02F2101/30C02F2103/36C02F2209/08C02F2305/026
Inventor 郭福民王兵崔斌会王刚刘琼
Owner SUNRESIN NEW METERIALS CO LTD XIAN
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