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Preparation method of methyl o-sulphamoylbenzoate

A technology of methanesulfonamide and reaction is applied in the field of preparation of methanesulfonamide, which can solve the problems of large dehydration water consumption, low efficiency and the like, and achieve the effect of increasing production capacity

Active Publication Date: 2015-11-25
辉县市润得生物科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high dehydration water consumption and low efficiency in the benzenesulfonyl chloride amination method of o-methyl formate in the prior art, and provide a new dehydration method, which has relatively simple steps and is suitable for practical use

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  • Preparation method of methyl o-sulphamoylbenzoate
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  • Preparation method of methyl o-sulphamoylbenzoate

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[0025] In order to make the technical problems to be solved, technical solutions and beneficial effects clearer, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The concrete process step of production method of the present invention is as follows:

[0027] (1) Adopt the traditional method for producing methanesulfonamide from methyl o-formate benzenesulfonyl chloride to carry out steps such as diazonium reaction, displacement reaction, chlorination reaction, static reaction, amination reaction, neutralization reaction to raw material successively.

[0028] figure 1 Show the production process of methanesulfonamide from methyl o-formate benzenesulfonyl chloride. Now put the mixed acid prepared by water, hydrochloric acid and sulfuric acid in the diazo pot, and star...

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Abstract

The invention relates to a preparation method of methyl o-sulphamoylbenzoate. The preparation method specifically includes the steps of conducting a diazo reaction, conducting a replacement reaction, conducting a chlorination reaction, conducting a standing reaction, conducting an amination reaction, conducting a neutralization reaction, dewatering, drying and packaging. In the dewatering step, mother liquid is placed in a diaphragm press filter to be subjected to extrusion and diaphragm bulging press and then subjected to re-extrusion and diaphragm bulging after being washed, a filter-press dehydration separation technology is initiated and replaces a traditional centrifugal dewatering separation technology, and then the dewatering purpose is achieved. Compared with the prior art, more electricity and water are saved through the method, the capacity under the equal energy consumption is greatly improved, the production environment is improved, and the labor intensity is relieved.

Description

technical field [0001] The invention relates to a preparation method of methanesulfonamide. Background technique [0002] Methyl o-formate benzenesulfonamide is referred to as methanesulfonamide, CAS number: 57683-71-3, is a white solid that is insoluble in water but soluble in alcohol, ether, benzene and other organic solvents. Used as medicine and pesticide intermediates, mainly used in the synthesis of sulfonylurea herbicides, and intermediates of herbicides metsulfuron-methyl, rimsulfuron-methyl and ethametsulfuron-methyl. At present, as an intermediate of high-efficiency, broad-spectrum, low-toxicity and high-selectivity herbicides, methanesulfonamide has been adopted by many herbicide manufacturers. [0003] There are two main production processes for methanesulfonamide, which are the esterification method of o-formylbenzenesulfonyl imide (saccharin method for short) and the method of benzenesulfonyl chloride amination of methyl o-formate. The technical process of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C311/16C07C303/40
Inventor 田振民郭海凤王继龙杨向东杨金花高艳洁侯巧慧谭英杰朱学英周慧
Owner 辉县市润得生物科技有限公司
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