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Method for treating acidic wastewater of acrylic acid device

An acid waste water, acrylic acid technology, applied in natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of difficult biological method, difficult to meet the national environmental protection discharge standard, high treatment cost, and achieve energy saving. Significant effect, significant emission reduction effect, significant effect of resource utilization

Active Publication Date: 2014-05-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the fuel combustion method commonly used to treat acid wastewater has high treatment costs (about 100 yuan per ton of acid wastewater treatment), which not only consumes fossil fuels but also increases carbon dioxide emissions; due to the high formaldehyde content of acid wastewater, it is difficult to use Biological treatment; RO membrane separation of acidic wastewater, due to the high permeability of formaldehyde, acetic acid, acrylic acid and other acidic substances, it is difficult for the permeate of RO membrane to meet the national environmental protection discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In a four-necked reaction flask equipped with a magnetic stirrer, a condenser, and a thermometer, 300 g of acidic waste water with a formaldehyde content of 1.55 wt % and a pH value of 2.5 was added successively, and 7H 2 O Ferrous sulfate 0.253g, start the stirrer, when the temperature rises to 60°C, start to drop 35.23g of 30% hydrogen peroxide, the reaction time is 1h, and the final reaction temperature is 85°C. The content of formaldehyde in the oxidation solution is 0.002wt%, and the removal rate of formaldehyde is 99.87%.

Embodiment 2

[0017] In the 1m equipped with electric stirrer and external circulation heat exchanger 3 In the stainless steel open tank reactor, 530kg of acid waste water with a formaldehyde content of 2.04wt%, a pH value of 2.5, and a COD value of 52765mg / L were added successively, and the 7H 2 O ferrous sulfate 450g, start the agitator, start the circulation pump, open the heating steam valve, raise the temperature to 60°C, use the liquid level to add 50kg of 27.5% hydrogen peroxide dropwise, the reaction time is 3h, and the final reaction temperature is 80°C. The content of formaldehyde in the oxidation solution is 0.005wt%, the removal rate of formaldehyde is 99.75%, the COD value of the oxidation solution is 34593mg / L, and the removal rate of COD is 34.44%.

Embodiment 3

[0019] In the 1m equipped with electric stirrer and external circulation heat exchanger 3 In the stainless steel open tank reactor, the oxidizing solution obtained in Example 2 was added under the condition of 80 ℃, and 28kg of industrial grade sodium carbonate was added to neutralize acidic substances such as acetic acid, and the pH value of the neutralizing solution was 8.5. And the time is 40min, the consumption quota of industrial grade sodium carbonate per ton of acid wastewater is 52.83kg. After the neutralization solution is filtered, it is used as the raw material for the next step of RO membrane separation.

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Abstract

The invention relates to a method for treating acidic wastewater of an acrylic acid device. According to the method, a coupling technology is adopted for treating the acidic wastewater; according to the coupling technology, an oxidant is used for oxidizing and removing formaldehyde, acetaldehyde and acraldehyde out of the acidic wastewater; an alkali is used for neutralizing acetic acid and acrylic acid in oxidizing liquid; neutralizing liquid is separated by a membrane to remove water; and finally reduced-pressure concentrating, crystallizing and drying are carried out to prepare acetate. The formaldehyde removing rate of the oxidizing liquid in the method is more than 99.5%; after the neutralizing liquid is subjected to RO (Reverse Osmosis) membrane separation, transmitting liquid reaches national environment protection emission Standard II; the yield of sodium acetate trihydrate is more than 7.7% on the basis of the raw material acidic wastewater; and the sodium acetate trihydrate product can be used as a raw material of a snow-melting agent.

Description

Technical field: [0001] The invention relates to a method for treating acid wastewater of an acrylic acid plant. Background technique: [0002] In the light-removing component tower of the refining process of the acrylic acid plant, water, acetic acid and toluene are steamed from the top of the tower with toluene as the entrainer. Layer and water layer, the water layer contains acetic acid, formaldehyde and water, etc., and the water layer is acid wastewater. [0003] Acid wastewater contains 2-4wt% acetic acid, 1-2wt% formaldehyde and a small amount of acrylic acid, etc., and the rest is water, and its COD value is about 50000mg / L. [0004] At present, the fuel combustion method commonly used to treat acid wastewater has high treatment costs (about 100 yuan per ton of acid wastewater treatment), which not only consumes fossil fuels but also increases carbon dioxide emissions; due to the high formaldehyde content of acid wastewater, it is difficult to use Biological treatm...

Claims

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Application Information

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IPC IPC(8): C02F9/04C07C53/10C02F103/36
Inventor 李健秀文福姬金光日王建刚陈忠李振兴施卫忠金成洙李军姜迎春
Owner PETROCHINA CO LTD
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