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A kind of processing method of acrylonitrile four-effect evaporation condensate

A treatment method, four-effect evaporation technology, applied in natural water body treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of limited reduction of total refractory pollutants, harsh operating conditions, high investment costs, etc. Achieve the effect of short processing time, short processing flow and clean processing method

Active Publication Date: 2022-03-04
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The original treatment method has been eliminated. The existing treatment method has problems such as high investment cost, harsh operating conditions, and high operating costs. What is especially important is that the condensate can only be treated up to the standard after being diluted with a large amount of sewage, and the remaining is difficult to degrade. The total amount of pollutants can be reduced to a limited extent

Method used

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  • A kind of processing method of acrylonitrile four-effect evaporation condensate

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Effect test

Embodiment 1

[0031] The present embodiment provides a method for treating acrylonitrile four-effect evaporation condensate. The process flow diagram is as follows: figure 1 shown, it includes the following steps:

[0032] Acrylonitrile four-effect evaporation condensate influent water quality indicators: pH value is 7.3, ammonia nitrogen content is 45mg / L, total nitrogen content is 755mg / L, COD is 2825mg / L, BOD5 / COD=0.18, conductivity 175μs / cm.

[0033] Step 1: The acrylonitrile four-effect evaporation condensate directly enters the electrocatalytic oxidation unit, and the anode of the electrocatalytic oxidation treatment adopts Ti / RuO 2 -IrO 2 -TiO 2 Electrodes and cathodes are made of stainless steel electrodes, the treatment time for electrocatalytic oxidation is 7h, and the treatment current density is 700A / m 2 , the added synergist is sodium chloride, sodium sulfate and sodium bicarbonate in a mass ratio of 5:3:1. When the electrocatalytic oxidation reaction starts, the initial dosag...

Embodiment 2

[0038] The present embodiment provides a method for treating acrylonitrile four-effect evaporation condensate, comprising the following steps:

[0039] Step 1: The acrylonitrile four-effect evaporation condensate directly enters the electrocatalytic oxidation unit, and the anode of the electrocatalytic oxidation treatment adopts Ti / RuO 2 -IrO 2 -SnO 2 Electrodes and cathodes are made of stainless steel electrodes, the treatment time of electrocatalytic oxidation is controlled to be 6h, and the treatment current density is 800A / m 2 , the added synergist is sodium chloride, sodium sulfate and sodium bicarbonate in a mass ratio of 5:3:1. When the electrocatalytic oxidation reaction starts, the initial dosage of the synergist is 10kg / t. The reaction process The supplementary amount of the synergist was 1 kg / t to maintain the concentration of the synergist in the electrocatalytic oxidation unit at 10 kg / t.

[0040] Step 2: The effluent treated by the electrocatalytic oxidation u...

Embodiment 3

[0044] The present embodiment provides a method for treating acrylonitrile four-effect evaporation condensate, comprising the following steps:

[0045] Step 1: The acrylonitrile four-effect evaporation condensate directly enters the electrocatalytic oxidation unit, and the anode of the electrocatalytic oxidation treatment adopts Ti / RuO 2 -IrO 2 -SnO 2 Electrodes and cathodes are made of stainless steel electrodes, the treatment time of electrocatalytic oxidation is controlled to be 7h, and the treatment current density is 800A / m 2 , the added synergist is potassium sulfate, potassium chloride, sodium carbonate and sodium hydroxide in a mass ratio of 6:4:1:1. When the electrocatalytic oxidation reaction starts, the initial dosage of the synergist is 11kg / t, the supplementary amount of the synergist in the reaction process is 1.2kg / t to maintain the concentration of the synergist in the electrocatalytic oxidation unit at 11kg / t.

[0046] Step 2: The effluent treated by the e...

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Abstract

The invention provides a treatment method for acrylonitrile four-effect evaporation condensate. The treatment method includes: performing electrocatalytic oxidation treatment on the four-effect evaporation condensate of acrylonitrile under the action of a synergist; stabilizing the effluent treated by the electrocatalytic oxidation treatment; performing electrodialysis treatment on the effluent treated by the stabilized treatment to complete the treatment of propylene Treatment of nitrile four-effect evaporation condensate. The acrylonitrile four-effect evaporation condensate treated by the method for treating the acrylonitrile four-effect evaporation condensate can be discharged up to the standard, and the treatment process is short.

Description

technical field [0001] The invention relates to a method for treating sewage, in particular to a method for treating acrylonitrile four-effect evaporation condensate, and belongs to the technical field of sewage treatment. Background technique [0002] Acrylonitrile is a highly toxic, flammable, colorless liquid with a bitter almond taste. As an important organic chemical raw material, it is widely used in synthetic fibers, synthetic rubber, synthetic plastics and other industrial fields. The production of acrylonitrile by ammoxidation of propylene also produces by-products such as acetonitrile, hydrocyanic acid, acrolein and some high-boiling polymers. The reaction product first enters the quench tower, and the catalyst powder, polymer and excess ammonia are removed by using waste water and aqueous sulfuric acid solution, and the quench waste water is treated by recycling ammonium sulfate and incineration; Qualified acrylonitrile, acetonitrile, hydrocyanic acid and other b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/34C02F101/38C02F103/36
CPCC02F9/00C02F1/4672C02F1/4693C02F2101/38C02F2201/4615C02F2201/4614C02F2201/46135C02F2101/34C02F2209/14C02F2209/06C02F2209/16C02F2209/05C02F1/46109C02F2001/46133C02F2001/46142C02F2103/36
Inventor 阎光绪李阳郭绍辉刘景峰李敏王文虎王佳
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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