Industrial production method for continuously preparing Dailon

A production method, the technology of Diuron, is applied in the field of industrialized production of continuous preparation of Diuron, which can solve the problems of great impact on product quality and low production capacity

Active Publication Date: 2012-10-24
JIANGSU YANGNONG CHEM GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent CN101709041A discloses a production method of diuron intermittently produced in a kettle, the disadvantage is that the production capacity is small, and the product quality is greatly affected by the quality of the operator's control

Method used

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  • Industrial production method for continuously preparing Dailon
  • Industrial production method for continuously preparing Dailon

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 1. Preparation:

[0024] Prepare 3,4-dichloroisocyanate in toluene as a 15% toluene solution of 3,4-dichloroisocyanate in mass percent for use.

[0025] Mix dimethylamine and water to form a 40% aqueous solution of dimethylamine by mass, and set it aside.

[0026] The three-stage reactors are sequentially connected in series by switching valves, and the material overflow of the third-stage reactors is connected to the collection kettle through the valves. The volumes of the continuous first, second and third stage reactors are 500L, 1000L and 1000L respectively.

[0027] 2. Production control:

[0028] Add 300L of toluene to the reactors at all levels, raise the temperature, and control the reaction temperatures of the first, second and third reactors to be 15-20°C, 25-30°C, and 27-32°C, respectively.

[0029] At the same time, the toluene solution of 3,4-dichloroisocyanate and the aqueous dimethylamine solution are pumped into the first-stage reactor, and the feed f...

example 2

[0035] The flow rate of the dimethylamine aqueous solution in Example 1 is adjusted to 20 L / hr, the pH value of the material in the first-stage reactor is 7, and the others remain unchanged. The average yield of Diuron is 88% and the content is 91%.

example 3

[0037] The concentration of the toluene solution of 3,4-dichloroisocyanate in Example 1 is adjusted to 25%, the flow rate is constant (218 L / hr), the flow rate of the dimethylamine aqueous solution is adjusted to 41 L / hr, in the primary reactor The pH value of the material was determined to be 10, the overflow in the reaction process was difficult, easy to block, and the continuous process could not be carried out normally.

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Abstract

The invention relates to a production method of a pesticide product, particularly an industrial production method for continuously preparing Dailon. A multi-kettle-cascade reactor is adopted, the reaction raw materials isocyanate and dimethyl amine are continuously fed into the reaction kettle in the form of dilute solutions to react, and the product is discharged by overflow. The invention overcomes the defects of low productive capacity, low control stability and the like in the intermittent reaction apparatus, and has the characteristics of high yield and good product quality; and the reaction yield is higher than 97%, and the product content is higher than 98%.

Description

technical field [0001] The invention relates to a production method of pesticide varieties, in particular to a continuous industrial production method of the pesticide herbicide Diuron. Background technique [0002] Diuron (English name Diuron) is a substituted urea herbicide developed by DuPont of the United States. It is derived from the addition of 3,4-dichloroisocyanate and dimethylamine. The reaction equation is as follows: [0003] [0004] Diuron has a systemic conduction effect and a certain contact effect, mainly root absorption. After the weed root system absorbs the pesticide, it spreads to the leaves on the ground and spreads along the veins to the surroundings. It can kill the plants by inhibiting the Hill reaction in photosynthesis, causing the weeds to fade from the tip and edge of the leaves, and finally to the leaves. The whole leaf withers, unable to produce nutrients, and dies of starvation. Diuron is mainly used for cotton, soybean, corn, peanut, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C275/30C07C273/18
Inventor 石苏洋王秋萍许金来黄文嵘孟宪跃侯申础刘勇
Owner JIANGSU YANGNONG CHEM GROUP
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