Method and device for producing clomazone

A technology of clomazone and tubular reactor, which is applied in the direction of organic chemistry, can solve the problems of unfavorable stable production of clomazone, unstable product quality, and small capacity of a single set of equipment, so as to achieve shortened reaction time and high product quality. Increased yield and high degree of automation

Active Publication Date: 2012-07-25
WEIFANG CYNDA CHEM +1
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  • Abstract
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Problems solved by technology

The synthesis of clomazone in my country generally adopts kettle-type batch-stirred tanks. The capacity of a single set of equipment is small, the residence time of reactants in the

Method used

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  • Method and device for producing clomazone
  • Method and device for producing clomazone

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Embodiment Construction

[0025] Accompanying drawing is a kind of specific embodiment of the present invention. This embodiment comprises a large tank 1 of hydroxylamine hydrochloride solution, a large tank 4 of chlorpivaloyl chloride and a large tank 5 of o-chlorobenzyl chloride, and the three large tanks are respectively communicated with a mixer 8 through a feed pump 2, and the mixer 8 is communicated with Low temperature tubular reactor 9, liquid caustic soda tank 6 is communicated with the feed pipe of low temperature tubular reactor 9 by feed pump 2, and low temperature tubular reactor 9 is connected with high temperature tubular reactor 11 by preheater 10, A stratifier 12 is connected to the outlet of the high temperature tubular reactor 11; a waste water treatment pipe 13 is arranged on the outlet of the top end of the stratifier 12, and a thin film evaporation tube 14 is arranged on the outlet of the bottom end; the low temperature tubular reaction A frozen brine cooling pipe is arranged in t...

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Abstract

The invention belongs to the field of pesticide production, and particularly discloses a method and a device for producing clomazone. A tubular reactor is designed into two sections, and the internal temperatures of the two pipe sections are respectively controlled in a production process, so that reactants in the tubular reactor are respectively kept in different temperature ranges; and a catalyst is added into the tubular reactor to shorten the reaction time of a product and avoid producing impurities caused by long-time contact. The method and the device provided by the invention make use of the particularity of temperature controllability of the tubular reactor in the production process and the reaction contact time decreased by the catalyst to increase the product yield and shorten the reaction period.

Description

(1) Technical field [0001] The invention belongs to the field of pesticide production, in particular to a method and device for producing 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 soybeans and peanuts. Absorbed by roots and young shoots of plants, channeled upwards, diffused to leaves through 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. Under the recommended dose, the subsequent crops can be selectively arranged to avoid damage. [0003] According to the classification standard of pesticide toxicity in China, clomazone is a low-toxic herbicide. The main synthesis ...

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Application Information

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IPC IPC(8): C07D261/04
Inventor 邹亚波李凯王现全姚刚
Owner WEIFANG CYNDA CHEM
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