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A method for purifying acrylonitrile production wastewater by selective adsorption

A technology for the production of wastewater and acrylonitrile, which is applied in chemical instruments and methods, natural water treatment, water/sewage treatment, etc. It can solve the problems of low treatment efficiency, high energy consumption, and complicated treatment process, and achieve easy sedimentation, separation, and adsorption The effect of stable performance and good settlement performance

Inactive Publication Date: 2016-03-30
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is made in view of the above-mentioned problems existing in the prior art. The purpose of the present invention is to provide a class of adsorbents that can selectively and efficiently adsorb and remove pyridines and nitriles in acrylonitrile production wastewater, and develop a An efficient, cheap, flexible and convenient method for purifying acrylonitrile production wastewater by selective adsorption to solve the problems of low treatment efficiency, high energy consumption and complicated treatment process in the current treatment process of acrylonitrile production wastewater

Method used

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  • A method for purifying acrylonitrile production wastewater by selective adsorption
  • A method for purifying acrylonitrile production wastewater by selective adsorption
  • A method for purifying acrylonitrile production wastewater by selective adsorption

Examples

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Embodiment 1

[0027] A method for selectively adsorbing and purifying acrylonitrile production wastewater with modified silicon-containing porous materials. The silicon-containing porous material used in the method is obtained by modifying commercially available silicon-containing porous materials with silicon tetrafluoride. The silicon modification process is as follows: Put the silicon-containing porous material (preferably MCM-22 molecular sieve material) in a vacuum oven, evacuate to below 80Pa (absolute pressure), set the drying temperature to 120°C, keep it for 4 hours, switch the vacuum oven to enter Pass silicon tetrafluoride gas into the gas port line to the vacuum oven with a pressure of 100kPa, keep it warm for 15 minutes, evacuate again and stop heating, after the oven temperature drops to room temperature, the modified MCM-22 molecular sieve can be taken out.

Embodiment 2

[0029] The process of modifying SBA-15 molecular sieve with silicon tetrafluoride is: place the commercially available SBA-15 molecular sieve in a vacuum oven, evacuating to below 50Pa (absolute pressure), set the drying temperature to 120℃, and keep it for 3h After that, switch the vacuum oven air inlet pipe to pass silicon tetrafluoride gas to the vacuum oven pressure of 100kPa, keep it for 20 minutes, evacuate again and stop heating, when the oven temperature drops to room temperature, you can take out the modified SBA-15 Type molecular sieve.

Embodiment 3

[0031] The silicon tetrafluoride modification process of MCM-41 molecular sieve is: put the commercially available MCM-41 molecular sieve in a vacuum oven, evacuate to below 100Pa (absolute pressure), pass silicon tetrafluoride gas, and heat it for 20 minutes , Other operations are the same as in Example 1.

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Abstract

The invention relates to a water treatment method for purifying acrylonitrile production wastewater by virtue of the selective adsorption property of an adsorbent. The adsorbent is prepared from one or more silicon tetrafluoride modified silicon-containing powder porous materials, and the wastewater is treated by feeding the silicon-containing powder porous materials into the acrylonitrile production wastewater. The feeding amount of the adsorbent in the acrylonitrile production wastewater is 1-10kg / m<3>, and the treatment time is controlled to be 5-30 minutes. Compared with methods utilizing adsorbents such as activated carbon, resin and clay, the water treatment method provided by the invention is high in adsorption efficiency and rapid in adsorption speed, is capable of efficiently removing CODCr, total carbon and total organic carbon in the wastewater within minutes, and is particularly relatively good in selective adsorption effect on organisms which cause high concentration of CODCr and total carbon in the acrylonitrile production wastewater, and the adsorption property is barely affected by the pH value and the temperature of the wastewater.

Description

Technical field [0001] The invention relates to the technical field of water pollution control, in particular to a water treatment method for purifying acrylonitrile production wastewater by using the selective adsorption performance of an adsorbent. Background technique [0002] Acrylonitrile (AN) is mainly used in the production of acrylic fiber, nitrile rubber, adiponitrile, acrylamide, ABS resin, etc. It is the basic raw material of the three major synthetic materials (synthetic fiber, plastic, synthetic rubber), and is used in the organic synthesis industry. Wide range of uses. In recent years, as the demand for downstream synthetic materials continues to grow, my country's acrylonitrile production capacity and output have been rapidly increased. It is estimated that by 2016, my country's acrylonitrile production capacity will exceed 2 million tons / year, and may even reach 2.6 million tons / year. With the continuous expansion of the production scale of acrylonitrile, more a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/281C02F2103/36C02F2303/16
Inventor 代云容宋永会涂响姜艳朋袁钰
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI