Method for preparing bentazone sodium salt powder

A technology of bentazone and sodium salt, which is applied in the field of preparation of bentazone sodium salt powder, can solve the problems of high acid sewage, unfavorable production cost, consumption of acid and alkali water, etc., and achieve the effect of transportation cost advantage

Active Publication Date: 2013-02-13
HEFEI XINGYU CHEM
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  • Abstract
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Problems solved by technology

The traditional use is to produce the original drug of bentazone first, and then make the original drug into an aqueous solution. This method produces a large amount of acidic sewage and consumes acid-base water, which is not conducive to production costs.

Method used

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Experimental program
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Embodiment Construction

[0013] A preparation method of bentazone sodium salt powder, using isatoic anhydride as raw material, first undergoes amide synthesis, sulfonation synthesis, ring-closure synthesis and other reactions in a dichloroethane solvent system, the first step is to synthesize the organic phase after ring-closure synthesis After washing with water, put the organic phase into the extraction tank, add appropriate amount of water, slowly add alkali to adjust the pH to 8-9, stop adding alkali, stir for half an hour to retest the pH=8-9, stop stirring and let stand;

[0014] The second step is to wait for the first step solution to stand and separate: take the upper layer of water phase material and put it into the concentration kettle, take samples to measure the content of bentazone in the water phase, calculate and concentrate according to the content of bentazone in the water phase, and concentrate the water phase Loose content ≥ 48% to meet the requirements;

[0015] In the third step,...

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Abstract

The invention discloses a method for preparing bentazone sodium salt powder, mainly relates to a method for preparing a chemical product and mainly aims to provide a method for preparing the bentazone sodium salt powder, which is convenient and practical, saves cost and is suitable for large-scale production. The method comprises the following steps: taking the 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, concentrating, decreasing temperature, crystallizing, drying and packaging to obtain the bentazone sodium salt powder which can be used directly. The main process of the method adopts a simple principle, the repeated steps are omitted, and the cost is saved. The user can use the product directly after the product is packaged, and the method is simple, convenient and environmental-friendly.

Description

technical field [0001] The invention relates to the technical field of preparation methods of chemical products, in particular to a preparation method of bentazone sodium salt powder. Background technique [0002] Benazone is a widely used low-toxicity herbicide. Its mode of action and mechanism are mainly achieved by sodium salt of bentazone: contact type selective post-emergence weeding, used for stem and leaf treatment at seedling stage, through leaf contact kick in. When used in dry fields, it first penetrates into the chloroplast through the leaf surface to inhibit photosynthesis. When used in paddy fields, it can not only penetrate through the leaves but also absorb through the roots, and transmit to the stems and leaves, which strongly hinders the photosynthesis and water metabolism of weeds, causes nutrient starvation, and causes physiological dysfunction and death. The active ingredients are metabolized to the weakly active sugar conjugates in the tolerant crops f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D285/16A01N43/88A01N25/12A01P13/00
Inventor 王龙余招敏鲍恩付
Owner HEFEI XINGYU CHEM
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