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Method for treating quenching wastewater in acrylonitrile production process

A technology of production process and treatment method, which is applied in the field of quenching wastewater treatment, can solve the problems of serious environmental pollution and high energy consumption, and achieve the effects of simple process, good technical effect, and easy industrialization

Active Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is the problem of high energy consumption and serious environmental pollution in the treatment of quenched wastewater in the prior art

Method used

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  • Method for treating quenching wastewater in acrylonitrile production process
  • Method for treating quenching wastewater in acrylonitrile production process
  • Method for treating quenching wastewater in acrylonitrile production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] according to figure 1 As shown, the COD value of the feed quenching wastewater is 340295mg / L. The catalytic wet oxidation reaction zone includes 6 adiabatic fixed-bed reactors, and each reactor only includes 1 stage of catalyst bed, and each catalyst bed is filled with composite Metal oxide catalyst; total volume space velocity is 1.8h -1 , the inlet temperature of each reactor is 200°C, and the inlet pressure of the first reactor is 12.0MPaG; the oxygen-containing gas is oxygen, and the amount of oxygen is the theoretical oxygen consumption required based on the COD value of the feed quenched wastewater 1.3 times of that; the amount of gas entering from the inlet of the quenched waste water raw material is 10% of the total intake, and the amount of gas entering from the bottom of the catalyst bed of the first section to the sixth section is respectively 10% and 10% of the total intake. 12%, 14%, 16%, 18%, 20%; the COD removal rate of the obtained quenching wastewater ...

Embodiment 2

[0030] according to figure 1 As shown, the COD value of the feed quenching wastewater is 287831mg / L, and the catalytic wet oxidation reaction zone includes 5 adiabatic fixed-bed reactors. Only one stage of catalyst bed is included, and each catalyst bed is filled with composite metal oxide catalyst; the total volume space velocity is 1.2h -1 , the inlet temperature of each reactor is 210°C, and the inlet pressure of the first reactor is 10.5MPaG; the gas containing oxygen is oxygen, and the amount of oxygen is the theoretical oxygen consumption required based on the COD value of the feed quenched wastewater 1.2 times of that; the amount of gas entering from the inlet of the quenched waste water raw material is 5% of the total intake, and the amount of gas entering from the bottom of the catalyst bed of the first section to the seventh section is respectively 4% and 4% of the total intake 9%, 10%, 14%, 16%, 19%, 23%; the COD removal rate of the obtained quenching wastewater is...

Embodiment 3

[0032] according to figure 1 As shown, the COD value of the feed quenching wastewater is 87343mg / L, and the catalytic wet oxidation reaction zone includes 2 adiabatic fixed-bed reactors, and the first reactor includes 2 stages of catalyst beds and is filled with composite metal oxide catalysts. The second reactor includes 2 stages of catalyst beds and are filled with precious metal supported catalysts; the total volume space velocity is 0.8h -1 , the inlet temperature of each reactor is 220°C, and the inlet pressure of the first reactor is 8.0MPaG; the oxygen-containing gas is air, and the amount of air is sufficient to make the amount of oxygen contained in the feed quenched wastewater COD 1.4 times of the theoretical oxygen consumption required by the value meter; the amount of gas entering from the inlet of the quenched waste water raw material is 0% of the total intake, and the amount of gas entering from the bottom of the catalyst bed of the first section to the fourth se...

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Abstract

The invention relates to a method for treating quenching wastewater in an acrylonitrile production process. A purpose of the invention is mainly to solve the problems of high energy consumption and serious environmental pollution in treatment of quenching wastewater in the prior art. The method comprises the following steps that acrylonitrile quenching wastewater and oxygen-containing gas are subjected to heat exchange and / or preheating and then enter a catalytic wet oxidation reaction zone, and a treated material is obtained under the action of a catalyst, wherein one part of the oxygen-containing gas enters from a quenching wastewater raw material inlet, and the other part of the oxygen-containing gas enters the reaction zone from the bottom of each section of a catalyst bed layer in a manner of gradually increasing the gas inflow. By adopting the technical scheme, the problem is well solved, and the method can be applied to industrial application of quenching wastewater treatment inan acrylonitrile production process.

Description

technical field [0001] The invention relates to a treatment method for quenching waste water in the production process of acrylonitrile. Background technique [0002] Acrylonitrile (AN) is an important basic organic raw material, which is widely used in the manufacture of chemical products such as synthetic fibers, synthetic rubbers, and synthetic resins. At present, the main process for the production of acrylonitrile in China is propylene ammoxidation, that is, propylene, ammonia and air are used as the main raw materials. product. In the above-mentioned production process of acrylonitrile, plant waste water, mainly quenching waste water and refined waste water, will be produced, and these waste waters are highly toxic, high in chromaticity and complex in composition. Among them, the quenching wastewater is divided into one-stage and two-stage process quenching wastewater according to the different types of quenching towers. The one-stage quench tower process wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F103/36
CPCC02F1/725C02F2103/36
Inventor 陈伟卢和泮杨卫胜
Owner CHINA PETROLEUM & CHEM CORP
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