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Continuous production method of acephate

A technology of acephate linking and methamidophos is applied in the field of preparation of acephate continuous production, can solve the problems of no acephate continuous production and the like, achieves a high degree of automation, improved product output, and reduced waste water. Emission reduction effect

Inactive Publication Date: 2011-05-18
荆州沙隆达控股有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous production of acephate using automatic control technology and the whole process is the development trend of acephate production in the future, and there is no report on the continuous production of acephate

Method used

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  • Continuous production method of acephate

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0032] First add 600kg of methamidophos solution by metering at the inlet of reaction pump 1.1, start reaction pump 1.1, slowly add 370kg of acetic anhydride at the inlet of reaction pump 1.1; after adding acetic anhydride, slowly drop 15kg of catalyst at the inlet of reaction pump 1.1 , and at the same time open the inlet and outlet valves of the circulating water of the cooler, and control the temperature of the reactor 1.2 at 50°C. After the dropwise addition is completed, keep warm at 50-60°C for 2 hours. After the base material is prepared, start continuous feeding production. The input amount of methamidophos solution is 1200kg / h, acetic anhydride is 740kg / h, catalyst is 30kg / h, and the reaction temperature is controlled at 50°C. , the reaction material overflows from the intermediate tank 1.3 into the insulation tank 1.4, and the temperature of the insulation tank is controlled at 50-60 ° C. The acylation solution of the material that is finally completed overflows from ...

Embodiment 3

[0041] Add 2000kg of acylation solution at the inlet of reaction pump 2.1, start reaction pump 2.1, add acylation solution and water (or mother liquor) at the inlet of reaction pump 2.1, control the addition of acylation solution 2000kg / h, water 1000L / h (or Mother liquor 2000L / h), open the brine import and export valve of cooler simultaneously, control reactor 2.2 temperature at 20 ℃. The hydrolyzate of the reacted material overflows from the intermediate tank 2.3 into the transfer tank 2.4, and the hydrolyzate is used as the raw material for the next process. The reaction yield is 99.3%.

[0042] 3. Neutralization and continuous production

[0043] 3.1 Embodiment 1

[0044] Add 2000kg of hydrolyzate to the inlet of reaction pump 3.1, start reaction pump 3.1, add hydrolyzate, solvent and ammonia gas at the inlet of reaction pump 3.1, control the addition of hydrolyzate to 4000kg / h, solvent 1000L / h, add ammonia to control PH Value at 9, open the brine import and export valve...

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Abstract

The invention relates to a continuous production method of acephate, which comprises the steps of: continuously acylating in a reactor, hydrolyzing, neutralizing, extracting, desolventizing, crystallizing and recycling mother liquor. The invention solves the problem of low production yield of an acephate device, improves the production capacity by near 300 percent and ensures that the yield reaches 10 thousands t / year. The production process realizes the advanced process technology that the ammonia is used for carrying out neutralization, thereby greatly reducing the emission of wastewater. The continuous production process ensures that the yield of 97 percent acephate raw powder is improved to near 24t / day from 6t / day compared with the batch production process. The device has the advantages of stable production, high automation, greatly reduced labor intensity of operators and greatly improved product yield.

Description

technical field [0001] The invention relates to a method for producing pesticides, in particular to a preparation method for continuous production of acephate. Background technique [0002] Since the country has banned the use of highly toxic organophosphorus pesticides, the market occupied by highly toxic pesticides must be replaced by some high-efficiency and low-toxic pesticides. Insecticides with the largest yield among various insecticide varieties. After more than ten years of production and development of acephate pesticide in my country, the technical level is increasing day by day and the cost is gradually decreasing. [0003] There are two main production processes for acephate: one is acylation first and then transposition, currently there are only pilot test technology reports in China, and no industrialization has been realized; the other is translocation first and then acylation. At present, almost all acephate Aminophos manufacturers all adopt this method, b...

Claims

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Application Information

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IPC IPC(8): C07F9/24
Inventor 殷宏薛光才肖国华周骋刘孝平杨光富杨雄吴军段然
Owner 荆州沙隆达控股有限公司