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Method for treating waste water from isophthalonitrile synthesis technology

A technology of isophthalonitrile and synthesis process, applied in natural water treatment, chemical instruments and methods, degassed water/sewage treatment, etc., can solve the problems of low removal efficiency, high operating cost, and large one-time investment , to achieve the effect of no secondary pollution, obvious effect and good treatment effect

Active Publication Date: 2011-01-26
CAC NANTONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they have the disadvantages of low removal efficiency, large one-time investment and high operating costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Wastewater treatment capacity 400m 3 / d, the specific steps are as follows:

[0018] ① For pretreatment cyanide removal and ammonia nitrogen test, the pH of the wastewater was adjusted to 10.5, and the secondary stripping tower was added for stripping. The heating temperature was 87°C, the diameter of the stripping tower was 0.7m, and the height was 5m. After the waste water is stripped by air, the concentration of ammonia nitrogen is 200-300mg / L, CN - The concentration is about 22mg / L, and the COD concentration is about 9000mg / L;

[0019] ②Coagulation reaction test; the effective volume of the pretreated effluent is V=120m 3 In the coagulation reaction tank, add iron salt, the amount of iron salt coagulant is 20mg / L, the reaction time of fast stirring is 5min, the reaction time of slow stirring is 25min, the inclined plate sedimentation is 35min, pH=11, temperature 37°C; The concentration of ammonia nitrogen in the effluent after coagulation and precipitation is 100...

Embodiment 2

[0024] A method for treating waste water from isophthalonitrile synthesis process. First, the waste water from isophthalonitrile synthesis process is subjected to secondary blow-off treatment, then enters coagulation reaction tank for further decyanation, and is further treated by anaerobic biological filter , then use A 2 / O biochemical treatment process for denitrification; hydrogen peroxide oxidation treatment before final discharge.

[0025] The diameter of the secondary blow-off tower of described secondary blow-off treatment is 0.4~1.2m (example 0.4m, 0.8m, 1.2m), height 3~6m (example 3m, 5m, 6m); Before blow-off treatment, First adjust the waste water by adding alkali to adjust the pH of the waste water to 10-12 (Example 10, 11, 12); the reaction temperature of stripping treatment is 70°C-100°C (Example 70°C, 90°C, 100°C).

[0026] The effective volume of the coagulation reaction tank is V=80~150m 3 (Example 80m 3 、120m 3 、150m 3 ), adopt iron salt to carry out coa...

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Abstract

The invention discloses a method for treating waste water from an isophthalonitrile synthesis technology, which comprises the steps of: firstly, carrying out secondary stripping treatment on the waste water from the isophthalonitrile synthesis technology; then, entering a coagulation reaction pool for further decyanation; further treating in an anaerobic biologic filtration pool; then, denitrifying by adopting an A2 / O biochemical treatment technology; and carrying out hydrogen peroxide oxidation treatment before final discharge. The method has the advantages of low energy consumption and good degradation treatment effect.

Description

Technical field: [0001] The invention relates to a method for treating waste water in isophthalonitrile synthesis process. Background technique: [0002] The raw materials for the synthesis of isophthalonitrile are m-xylene, ammonia and air, and the ammoxidation reaction is carried out in a fluidized bed. This reaction will generate a certain amount of HCN and H while generating isophthalonitrile 2 O, the excess of ammonia gas is about 50%. After the subsequent capture process, HCN enters the water to form a total cyanide concentration of 500-800mg / L, an ammonia nitrogen concentration of 10000-15000mg / L, and a COD concentration of 8000mg / L-10000mg / L. Cyanide wastewater. The output of this set of isophthalonitrile production plant is 5,000 tons per year, about 130 tons of HCN is produced every year, and the amount of waste water is about 400 tons per day. The wastewater also contains m-methylbenzonitrile, benzonitrile, high boiling matter, insoluble matter and other organi...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/20C02F1/52C02F1/72C02F3/30C02F103/36
Inventor 聂秀金黄志文李海娟田晓宏
Owner CAC NANTONG CHEM
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