Treatment method for waste water of acephate producing process
Inactive Publication Date: 2008-03-19
SHANGHAI TOPCARE MEDICAL SERVICES CO LTD
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Problems solved by technology
The post-treatment mostly adopts ammonia water neutralization method. The defect of this process is that a large amoun...
Method used
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Embodiment 1
[0016] In a 5000L glass-lined reaction kettle, add 2500Kg of acephate production process wastewater, start stirring, add 1300Kg of 30% sodium hydroxide aqueous solution dropwise at 35°C, dropwise for 2 hours, so that the pH value reaches 9-9.5, and at the same time use 800Kg of water absorbs ammonia gas to produce 900Kg of ammonia water with a content of 17.1% and a yield of 93.3%. The temperature of the reaction solution was raised to 90°C, vacuum was controlled at -0.09MPa, and after precipitation for 3 hours, the temperature was cooled to 20°C to crystallize, and filtered after 2 hours to obtain 1300Kg of sodium acetate trihydrate with a content of 56.8% and a yield of 92.5%.
Embodiment 2
[0018] In a 5000L glass-lined reactor, add 2500Kg of acephate production process wastewater, start stirring, add 1300Kg of 30% sodium hydroxide aqueous solution dropwise at 38-40°C, drop for 2 hours, and make the pH value reach 9-9.3, Absorb ammonia with 900Kg embodiment 1 cut simultaneously, make 980Kg ammoniacal liquor, content 16.8%, yield 99.5%. The temperature of the reaction solution was raised to 95°C, and the vacuum was controlled at -0.09MPa. After 2.5 hours of precipitation, the mother liquor in Example 1 was cooled to 18°C to crystallize, and filtered after 2 hours to obtain 1395Kg of sodium acetate trihydrate with a content of 56.7% and a yield of 99.1 %.
Embodiment 3
[0020] In a 5000L glass-lined reaction kettle, add 2500Kg of acephate production process wastewater, start stirring, add 1300Kg of 30% sodium hydroxide aqueous solution dropwise at 35°C, dropwise for 2 hours, so that the pH value reaches 9-9.5, and at the same time use 850Kg of the distillate of Example 2 absorbs ammonia to produce 960Kg of ammonia water with a content of 17.0% and a yield of 98.9%. The temperature of the reaction solution was raised to 85°C, and the vacuum was controlled at -0.09MPa. After 3 hours of precipitation, the mother liquor in Example 2 was cooled to 20°C to crystallize, and filtered after 2 hours to obtain 1390Kg of sodium acetate trihydrate, with a content of 56.2%, and a yield of 97.8 %.
[0021] The average yield of ammonia in the above three embodiments is 97.3%, and the average yield of sodium acetate trihydrate is 96.5%.
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Abstract
The invention discloses a method of processing the process wastewater in the production of acephate. The acephate process wastewater is poured into a reaction kettle, thirty percent of sodium hydroxide solution is dripped into the acephate process wastewater at a temperature between 30 DEG C and 40 DEG C, the pH value is contolled in a range of nine to nine point five, and the ammonia gas generated by reaction is absorbed by water, so that ammonia is produced; reaction liquid is desolventized under the conditions of temperature between 80 DEG C and 100 DEG C and vacuum between-0.08 MPa and-0.1 MPa, the desolventizing time is two to four hours, the temperature is then decreased to 18 to 20 DEG C, so that the reaction liquid is crystallized, the crystallizing time is half to five hours, and finally, sodium acetate trihydrate and mother liquid are produced by extraction and filtration. The invention has the advantages of simple technique, safety, low cost, no production of three wastes and environmental protection.
Description
technical field [0001] The invention relates to a method for treating waste water in the production process of acephate, in particular to a method for preparing and recovering ammonia water and sodium acetate trihydrate through aqueous sodium hydroxide solution, which belongs to the environmental protection technology of pesticide chemical industry. Background technique [0002] Acephate is an acylated derivative of the insecticide methamidophos. It is a broad-spectrum insecticide with high efficiency, low toxicity and low residue. It is one of the ideal varieties to replace high toxicity and high residue pesticides. With the complete prohibition of the sale and use of the highly toxic pesticide methamidophos in China after 2007, the production and sale of acephate will usher in a broader space. [0003] At present, there are more than 30 manufacturers of acephate in China, and the production process is similar with minor differences. The post-treatment mostly adopts ammoni...
Claims
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