Method for treating high-concentration organic waste water in acroleic acid production

A wastewater treatment, acrylic technology, applied in natural water treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as corrosion of pipelines and blockages

Inactive Publication Date: 2008-05-21
DONGHUA UNIV
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a method for treating high-concentration organic waste water in acrylic acid production, so as to overcome the defects of the above-mentioned method. The present invention adopts the evaporation wall type supercritical water oxidation technology, and the main reactor is a porous inorganic ceramic membrane The wall of the tube is porous and permeable. During the reaction in the reactor, clean water will penetrate from the outside to the inner wall through the pressure difference, forming a liquid protective film to protect the inner wall from corrosion, and redissolve the precipitated salts to solve the problem. The problems of corrosion and pipe blockage in traditional supercritical reactors are eliminated, the removal rate of organic matter is over 99.99%, and there will be no secondary pollution, which is environmentally friendly

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  • Method for treating high-concentration organic waste water in acroleic acid production

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Effect test

Embodiment 1

[0024] An acrylic acid factory diverts high-concentration wastewater from the production process and uses supercritical water oxidation technology for treatment. Wastewater COD Cr The concentration is 10000mg / L, the salt is 3000mg / L, and the wastewater from acrylic acid production is treated under the following conditions, with a daily treatment capacity of 0.5m 3 / d:

[0025] (1) The electric heating method is adopted in the preheating stage, and the preheating temperature is 300°C;

[0026] (2) The main reactor adopts coil electric heating, and the temperature of the reactor is controlled at: 600°C;

[0027] (3) The oxidant uses 30% hydrogen peroxide, and the flow rate of waste water, clear water, and oxidant inflow is controlled at 10:5:1. A proper amount of catalyst MnO can be added into the water 2 / γAl 2 o 3 , the concentration is about 10mg / L.

[0028] (4) Reaction pressure: 25Mpa.

Embodiment 2

[0030] An acrylic acid factory treats the high-concentration part of the wastewater in the production process separately, with a daily treatment capacity of 0.5m 3 / d, waste water COD Cr Concentration is 50000mg / L, salt 3000mg / L, Cl-5000mg / L. The factory uses the SCWO process to treat this waste water. In order to reduce the corrosion of equipment during the treatment process, the evaporation wall supercritical water oxidation technology is adopted, including the following conditions:

[0031] (1) Place acrylic acid production wastewater, oxidant and clear water in the wastewater and clear water tanks respectively, and add MnO to the wastewater 2 / γAl 2 o 3 As a catalyst, the concentration is 10-20mg / L;

[0032] (2) Electric heating is used in the preheating stage, and the preheating temperature is 300°C;

[0033] (3) The temperature of the main reactor is heated by electric coil, and the reaction temperature is kept at about 480°C;

[0034] (4) The oxidant uses 30% hydr...

Embodiment 3

[0037] An acrylic acid plant treats the high-concentration part of the wastewater in the production process separately, with a daily treatment capacity of 0.3m 3 / d, waste water COD Cr The concentration is 100000mg / L, and the salt is 30000mg / L. The factory uses the SCWO process to treat this waste water. In order to reduce the corrosion of equipment during the treatment process, the evaporation wall supercritical water oxidation technology is adopted, including the following conditions:

[0038] (1) Electric heating is used in the preheating stage, and the preheating temperature is 400°C;

[0039] (2) The temperature of the main reactor is heated by electric coil, and the reaction temperature is kept at 600°C;

[0040] (3) The oxidant uses 30% hydrogen peroxide, and the flow rate of waste water, clear water, and oxidant inflow is controlled at 1:1:1. A proper amount of catalyst MnO can be added into the water 2 / γAl 2 o 3 , the concentration is about 20mg / L;

[0041] (4...

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Abstract

The invention relates to a high concentrated organic compound wastewater treating method in the acrylic acid production, including that firstly oxidant and deionized water are mixed for preparing oxidant solution and is put in an oxidant tank. Secondly, wastewater and clear water for the acrylic acid production are respectively arranged in a wastewater tank and a clear water tank and catalysts are added in the wastewater. Thirdly, a pre-heater is heated to be at the temperature of 300-400 degree Celsius and a reactor is heated to be at the temperature of 400-600 degree Celsius. Fourthly, a high pressure plunger pump is opened, in which a sampler is put. The wastewater and the oxidant solution enter a microporous ceramic tube of the reactor after being preheated and pressurized respectively. The supercritical water oxidation under the pressure of 22-28MPa and the temperature of 374-600 degree Celsius is implemented. The clear water infiltrates into the microporous ceramic tube through an exine of a ceramic film. Fifthly, the treated effluent is qualified to be discharged through the cooling and the gas-liquid separation. The invention solves problems of the reactor inner wall corrosion and the tube blockage of a traditional supercritical water oxidation technology. The organic removal rate reaches to 99.99 percent above. And no secondary pollution can be made. The invention is friendly to the environment.

Description

technical field [0001] The invention belongs to the field of environmental wastewater treatment, and more particularly relates to a method for treating high-concentration organic waste water in acrylic acid production. Background technique [0002] As one of the important basic chemical raw materials, acrylic acid is mainly used in the production of comonomers butyl and ethyl acrylate for water-soluble coatings and adhesives, as well as in the production of superabsorbent resins, which are widely used in paints, chemical fibers, papermaking, Adhesives and cleaning agents and other industries. In recent years, great changes have taken place in the production and market of my country's acrylic acid industry. The output has soared from 96,400 tons in 1996 to 139,700 tons in 2001 and 142,300 tons in 2002, showing an increasing trend year by year. However, the production process of acrylic acid will produce a large amount of refractory, toxic and harmful wastewater. The chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F103/36
Inventor 李方龚为进杨波田晴陈季华奚旦立袁海源
Owner DONGHUA UNIV
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