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Recovery device and cyclic utilization method for waste acid water in metribuzin production

A recovery device and waste acid water technology, applied in chemical instruments and methods, water aeration, water pollutants, etc., can solve the problems of low added value sulfate, alkali consumption, energy waste, etc., to achieve great practicality and economy High performance, low energy consumption, and simple processing equipment

Pending Publication Date: 2020-01-14
JIANGSU SEVENCONTINENT GREEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment process not only consumes a large amount of alkali, but also produces a large amount of sulfate with low added value, resulting in waste of raw materials, waste of resources and waste of energy

Method used

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  • Recovery device and cyclic utilization method for waste acid water in metribuzin production
  • Recovery device and cyclic utilization method for waste acid water in metribuzin production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The specific indicators of the waste acid water produced by the mecitrione process are as follows:

[0055] index sulfuric acid% COD mg / L Exterior odor Triazinone% Metrizone % waste acid water 43 12080 yellow the smell 0.21 0.18

[0056]Add 8 t of the above waste acid water to 2 t of toluene, heat up to 60-70°C, heat and stir for 1 h, then let it stand for 0.5 h, separate layers, and the lower layer of acid water enters the aeration tank 3. The toluene phase is concentrated and put into the methylation reaction section. The temperature of the aeration tank 3 is 80-90°C, the rate of compressed air is 5 cubic meters per minute, and the aeration time is 2 hours. After cooling down to 40-50°C, it enters the sedimentation tank. The flow rate of the settling tank is 0.1m / s, the settling time is 30min, and the settled solids are treated as sludge. After settling, the acid water COD value is 6810mg / L. The acid water enters the resin towe...

Embodiment 2

[0058] The specific indicators of the waste acid water produced by the mecitrione process are as follows:

[0059] index sulfuric acid% COD mg / L Exterior odor Triazinone% Metrizone % waste acid water 50 10800 dark yellow the smell 0.15 0.10

[0060] Add 8 t of the above waste acid water to 2 t of toluene, heat up to 60-70°C, heat and stir for 1 h, then let it stand for 0.5 h, separate layers, and the lower layer of acid water enters the aeration tank 3. The toluene phase is concentrated and put into the methylation reaction section. The temperature of the aeration tank 3 is 60-70°C, the rate of compressed air is 6 cubic meters per minute, and the aeration time is 2 hours. After cooling down to 40-50°C, it enters the sedimentation tank. The flow rate of the settling tank is 0.1m / s, the settling time is 30min, and the settled solids are treated as sludge. After settling, the acid water COD value is 5110mg / L. The acid water enters the resi...

Embodiment 3

[0062] The specific indicators of the waste acid water produced by the mecitrione process are as follows:

[0063] index sulfuric acid% COD mg / L Exterior odor Triazinone% Metrizone % waste acid water 40 23000 dark yellow the smell 0.25 0.21

[0064] Add 8 t of the above waste acid water to 2 t of toluene, heat up to 60-70°C, heat and stir for 1 h, then let it stand for 0.5 h, separate layers, and the lower layer of acid water enters the aeration tank 3. The toluene phase is concentrated and put into the methylation reaction section. The temperature of the aeration kettle 3 is 60-70°C, the rate of compressed air is 2 cubic meters per minute, and the aeration time is 5 hours. After cooling down to 40-50°C, it enters the sedimentation tank. The flow rate of the settling tank is 0.1m / s, the settling time is 30min, and the settled solids are treated as sludge. After settling, the COD value of the acid water is 6130mg / L. It enters the resin t...

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Abstract

The invention relates to a recycling method of waste acid water from metribuzin production, which comprises the following steps: (1) extracting the waste acid water from metribuzin production to recover part of triazinone and metribuzin and reduce organic matters in the waste acid water; (2) carrying out aeration stripping on the extracted waste acid water to remove low-boiling-point substances such as methanol; (3) removing insoluble substances in the waste acid water subjected to aeration stripping; (4) performing resin adsorption on the waste acid water treated in the step (3) to remove residual organic matters, reducing the COD of the waste acid water from 4000-5000mg / L to 1000mg / L or below, changing the original wastewater color from yellow to faint yellow, and basically eliminating the odor of the waste acid water; and (5) concentrating the waste acid water subjected to resin adsorption to obtain concentrated sulfuric acid. According to the method, the waste acid water can be treated into the concentrated sulfuric acid capable of being recycled, treatment equipment is simple, energy consumption is low, and under the increasingly severe environment-friendly situation, high practicability and economical efficiency are achieved.

Description

technical field [0001] The invention belongs to the technical field of pesticide wastewater treatment, and in particular relates to a recovery device and a recycling method for waste acid water produced by mecitrione. Background technique [0002] Mecitrione is a selective herbicide, which is mainly used to control weeds in soybean, potato, tomato, sugarcane, corn and other field crops. The new production process of azimidone technical mainly uses triazinone as the reaction intermediate, and the methylation and sulfate synthesis process in this synthesis route needs to use concentrated sulfuric acid (≥96% content, COD≤1000mg / L) for reaction Solvent, after the reaction is completed, a large amount of waste sulfuric acid water is produced in the post-treatment process after adding water for washing. The concentration of the waste acid is about 30-60%, containing 0.1%-0.3% triazone, 0.1%-0.3% mecitrione, a small amount of organic matter such as methanol and sulfate. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/34
CPCC02F9/00C02F1/26C02F2001/007C02F1/28C02F7/00C02F1/04C02F2101/34
Inventor 李超朱振亚何永利褚小静李晨晨
Owner JIANGSU SEVENCONTINENT GREEN CHEM CO LTD
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