Method for producing high-purity clomazone

A clomazone, high-purity technology, applied in the field of clomazone research, can solve the problems of high energy consumption, low degree of automation, small capacity of a single set of devices, etc., and achieve the effect of high product purity

Active Publication Date: 2011-05-18
WEIFANG CYNDA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The clomazone crystallization in my country generally adopts kettle-type intermittent stirring tank, which has small capacity of a single device, long cryst

Method used

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  • Method for producing high-purity clomazone
  • Method for producing high-purity clomazone

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Experimental program
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Effect test

Embodiment 1

[0018] Feed amount: 15m 3 / h, the feed temperature is 30°C, two volume-decreasing series crystallizers are used, the temperature of the first crystallizer is controlled at 15-18°C, cooled with frozen brine, and the average residence time of the material is 5h; the temperature of the second crystallizer is controlled at 18-20°C , using cooling water to cool, and the average residence time of the material is 5h. After the discharged feed liquid is filtered, the product with a content of 80% is obtained, and the content of the uncrystallized residual clomazone mother liquor in the mother liquor is 65%.

Embodiment 2

[0020] Feed amount: 15m 3 / h, the feed temperature is 30°C, three volume-decreasing series crystallizers are used, the temperature of the first crystallizer is controlled at 18-20°C, cooled with frozen brine, and the average residence time of the material is 5h; the temperature of the second crystallizer is controlled at 20-22°C , using cooling water to cool, and the average residence time of the material is 5h. The temperature of the third crystallizer is controlled at 22-25°C, cooled with cooling water, and the average residence time of materials is 5 hours.

[0021] After the discharged feed liquid is filtered, the product with a content of 97% is obtained, and the content of the uncrystallized residual clomazone mother liquor in the mother liquor is 60%.

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Abstract

The invention relates to the field of researches on clomazone, and particularly discloses a method for producing clomazone. In the method for producing the clomazone, a clomazone crude product prepared by a 3-chloropivaloyl chloride method is adopted as a raw material. The method is characterized in that: the raw material crude product is introduced into two to three cooling crystallizers which are connected in series; circulating pumps are arranged on the cooling crystallizers; and the cooling crystallizers adopt cooling water and cooling brine as coolants respectively. In the method, a plurality of crystallizers with a grading function are connected in series for operations, crystalline particles are graded for many times, and the product has high purity; and the method is favorable for subsequent clients with high requirements.

Description

(1) Technical field [0001] The invention relates to the field of clomazone research, in particular to a method for producing high-purity clomazone. (2) Background technology [0002] Clomazone is an organic heterocyclic selective pre-emergence herbicide developed and produced by FMC Corporation of the United States. It is suitable for controlling annual grass weeds and broad-leaved weeds in crop fields such as Dadu and peanuts. It is absorbed by the roots and young shoots of plants, transported upwards, spreads to the leaves through the xylem, inhibits the synthesis of chlorophyll and carotene in sensitive plants, forms white seedlings, dies in a short period of time, and lasts for a long time. The biological activity in it can last for more than 6 months, and the recommended dose can be used to selectively arrange the subsequent crops to avoid phytotoxicity. According to the classification standard of pesticide toxicity in China, clomaline is a low-toxic herbicide, and its...

Claims

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Application Information

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IPC IPC(8): C07D261/04B01D9/04
Inventor 李凯邹亚波杨奇伟吴松兰张建国姚刚王现全
Owner WEIFANG CYNDA CHEM
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