Continuous crystallizing method for acephate

A technique for crystallization of acephate, which is applied in the field of continuous crystallization of acephate solution to produce high-content crystallization of acephate, can solve the problems of small capacity of a single set of equipment, easy to generate wall formation, and high energy consumption, and achieve Reduce energy consumption and solve the effect of finer grains

Inactive Publication Date: 2012-08-15
浙江嘉化集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the crystallization process adopts a simple kettle-type batch-type crystallization process. The capacity of a single set of equipment is small, the crystallization time is long, and it occupies a large area. The influence of human factors is relatively large, it is easy to cause wall formation, repeated crystallization is required, and the energy consumption is high. At the same time, the product content of one crystallization can only reach 90-95%, and the powder yield is about 65%.

Method used

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  • Continuous crystallizing method for acephate
  • Continuous crystallizing method for acephate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Equipment Specifications:

[0019] Pre-crystallizer buffer storage tank volume: 20m 3 ;

[0020] Heat exchanger, tubular type, heat exchange area: 300m 2 :

[0021] Volume of the second crystallizer: 30m 3 ;

[0022] Second-stage crystallizer jacket heat exchange area: 35m 2 .

[0023] The acephate solution produced with thiophosphoramide as raw material is desolvated by a thin film evaporator, the acephate content is 45%, the temperature is 58°C, and the flow rate is 4m 3 / h, enter the distribution hopper of the buffer storage tank 11 of the pre-crystallizer from port D through the potential difference, and enter the heat exchanger 12 through the circulation pump 13 for heat exchange. The distribution bucket on the top of the pre-crystallizer buffer storage tank 11, the temperature in the pre-crystallizer buffer storage tank 11 is controlled at 35°C. According to the liquid level setting, the material is transported to the middle of the secondary crystallizer 2...

Embodiment 2

[0025] The equipment used is the same as in Example 1.

[0026] The acephate solution produced with thiophosphoramide as raw material is desolvated by a thin film evaporator, the acephate content is 53%, the temperature is 65°C, and the flow rate is 3.4m 3 / h, enter the distribution hopper of pre-crystallizer 11 from port D by potential difference, and mother liquor (acephate content 18%) passes flow control 1m from continuous separation device 3 / h replenishes into the pre-crystallizer 11 through port C, controls the concentration of acephate in the pre-crystallizer 11 to be 45%, enters the heat exchanger 12 through the circulation pump 13 for heat exchange, and the heat exchanger controls the wall temperature difference 3 ℃, and the material It enters the distribution hopper at the top of the pre-crystallizer 11 through the circulation guide pipe, and the temperature in the pre-crystallizer 11 is controlled at 37°C. According to the liquid level setting, it is transported t...

Embodiment 3

[0028] The equipment used is the same as in Example 1.

[0029] The acephate solution produced with thiophosphoramide as raw material is desolvated by a thin-film evaporator, the acephate content is 56%, the temperature is 78°C, and the flow rate is 3.2m 3 / h, enter the distribution hopper of the pre-crystallizer 11 from port D through the potential difference, and the mother liquor (acephate content 18%) passes through the flow control 1.3m from the continuous separation device 3 / h replenishes into the pre-crystallizer 11 through port C, controls the concentration of acephate in the pre-crystallizer 11 to be 45%, enters the heat exchanger 12 through the circulation pump 13 for heat exchange, and the heat exchanger controls the wall temperature difference 5 ℃, and the material Enter the distribution hopper at the top of the pre-crystallizer 11 through the circulation guide pipe, the temperature in the pre-crystallizer 11 is controlled at 40°C, and according to the liquid leve...

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Abstract

A continuous crystallizing method for acephate includes the steps: continuously feeding acephate solution into two serially connected cooling crystallizers for crystallization, wherein the pre-crystallizer is a Krystal cooling crystallizer, the temperature in the crystallizer is controlled within 35-40 DEG C, and cooling is performed by circulating water; and the secondary crystallizer is a kettle type crystallizer (21) cooled by ice water at 4-7 DEG C, stirring of the kettle type crystallizer is controlled in a variable frequency manner, and the temperature in a kettle is controlled within 10-20 DEG C; and leading the kettle type crystallizer to be interlocked with an automatic centrifuge by means of liquid level control, continuously feeding materials into the automatic centrifuge for separation, obtaining crystalline powder after separation and obtaining an acephate product after drying. Most crystallization heat is removed by the circulating water in the pre-crystallizer, so that energy consumption can be effectively reduced, and the kettle type crystallizer used after the pre-crystallizer is beneficial to further growth of fine acephate grains under the stable condition so that the high-quality acephate product can be obtained.

Description

Technical field [0001] The invention relates to a continuous crystallization method of acephate, and specifically relates to a crystallization technology for producing high-content acephate by continuous crystallization of acephate solution prepared by translocation acylation using thiophosphoramide as raw material. Background technique [0002] Acephate, also known as methamphetamine, is a low-toxic pesticide. Acephate is a systemic insecticide that has stomach poisoning and contact killing effects, and can kill eggs. It has a certain fumigation effect. It is a slow-acting insecticide and is suitable for vegetables, tea trees, tobacco, fruit trees, cotton, and rice. , wheat, rape and other crops, it can control a variety of chewing, sucking mouthpart pests, harmful mites and hygiene pests. It is a good alternative drug after the ban on the use of methamidophos and methyl 1605. The current domestic production methods use thiophosphoramide as raw material, and obtain acephat...

Claims

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Application Information

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IPC IPC(8): C07F9/24
Inventor 钱柯伟纪宝琳孙勤杨阿三徐文梅董工兵程榕郑燕萍应春辉徐芸邵生富
Owner 浙江嘉化集团股份有限公司
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