Method for preparing bentazone aqueous agent

A technology of bentazone water agent and water phase, which is applied in botany equipment and methods, herbicides, algicides, biocides, etc., and can solve the problems of high cost, high environmental protection pressure, dark color of bentazone water agent, etc. problems, to achieve the effects of low production cost, reduced sewage discharge, and high product quality

Active Publication Date: 2013-02-13
甘肃西部鑫宇化学有限公司
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AI Technical Summary

Problems solved by technology

The existing technology repeatedly consumes acid and alkali, and the cost is high; acid waste water is produced, and the environmental protection pressure is high; the color of bentazone water agent is dark, and it is easy to produce a small amount of sediment after being placed

Method used

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  • Method for preparing bentazone aqueous agent
  • Method for preparing bentazone aqueous agent

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Embodiment Construction

[0019] A kind of preparation method of bentazone water agent, described this method, the first step, after the organic phase is washed with water after adopting closed-loop synthesis, cast activated carbon, stir at constant temperature for 30 minutes and filter to the extraction kettle through plate and frame; Wash the plate frame with tap water to the extraction kettle, and finish washing; blow dry for 30 minutes, and remove the activated carbon;

[0020] The second step, dilute alkali preparation: prepare 32% ionic membrane liquid alkali to the preparation kettle, add tap water to prepare the alkali content to 5% to 31%, and prepare it for extraction;

[0021] The third step, extraction kettle: Slowly add the pre-prepared dilute alkali dropwise, the dropping temperature is controlled at 25-60°C, and the pH value of the material is adjusted to 3-11;

[0022] The fourth step, after the pH value of the material is adjusted, let it stand for 2 hours, take the upper layer of wate...

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Abstract

The invention discloses a method for preparing a bentazone aqueous agent, belonging to the technical field of preparation of chemical products and aiming to provide a method for preparing a bentazone aqueous agent which is more environment-friendly and has higher appearance quality. The method comprises the following steps: taking isatoic anhydride as a raw material, carrying out amide synthesis, sulfonation synthesis and closed-loop synthesis reactions and the like in a dichloroethane solvent system, washing by water, extracting by alkaline water and concentrating by a thin-film evaporator to obtain the light-yellow bentazone aqueous agent. Compared with the traditional method, the method provided by the invention adopts less acid, base and strongly-acidic wastewater and improves the quality of the product.

Description

technical field [0001] The invention relates to the technical field of preparation of chemical products, in particular to a preparation method of bentazone aqueous solution. Background technique [0002] Benazone is an important fine chemical product and a widely used herbicide, which can be used in rice, soybean, peanut, wheat and other crops. The preparation method of traditional bentazone water agent, with isatoic anhydride in dichloroethane system through amide synthesis, sulfonation synthesis, ring-closed synthesis, washing, alkali extraction, aqueous phase acidification, centrifugal (plate and frame) discharging, Add water alkali surfactant to prepare water agent. The existing technology repeatedly consumes acid and alkali, and the cost is high; acid waste water is produced, and the pressure on environmental protection is great; the color of bentazone water agent is dark, and it is easy to produce a small amount of sediment after being placed. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D285/16A01N43/88A01N25/02A01P13/00
Inventor 江文周林王传品
Owner 甘肃西部鑫宇化学有限公司
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