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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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, they have the disadvantages of low removal effic

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0016] Example 1

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

[0018] ①Pretreatment for cyanide removal and ammonia nitrogen test. The pH of the wastewater is adjusted to 10.5, and it is added to the secondary stripping tower for stripping. The heating temperature is 87°C. The stripping tower has a diameter of 0.7m and a height of 5m. After the wastewater is blown off by air, the ammonia nitrogen concentration 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 pretreatment effluent entering into is V=120m 3 Add iron salt to the coagulation reaction tank, 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 sloping plate precipitation is 35min, the pH=11, the temperature is 37℃; The ammonia nitrogen concentration of the effluent after coagulation prec...

Example Embodiment

[0023] Example 2:

[0024] A method for treating isophthalonitrile synthesis process wastewater. First, isophthalonitrile synthesis process wastewater is subjected to two-stage stripping treatment, and then enters a coagulation reaction tank for further decyanation, and is further processed by an anaerobic biological filter , Then use A 2 / O Biochemical treatment process for nitrogen removal; before final discharge, hydrogen peroxide oxidation treatment is carried out.

[0025] The diameter of the secondary stripping tower of the secondary stripping treatment is 0.4-1.2m (for example, 0.4m, 0.8m, 1.2m), and the height is 3-6m (for example, 3m, 5m, 6m); before the stripping treatment, The wastewater is first adjusted by adding alkali to adjust the pH of the wastewater to 10-12 (Examples 10, 11, 12); the reaction temperature of the stripping treatment is 70 ℃-100 ℃ (for example 70 ℃, 90 ℃, 100 ℃).

[0026] The effective volume of the coagulation reaction tank is V=80~150m 3 (Example 8...

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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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