Method for producing sodium saccharin

A production method and technology of sodium saccharin, applied in the direction of organic chemistry, etc., can solve the problems of multiple production links, long production process routes, and high ammonia nitrogen emissions

Active Publication Date: 2014-04-09
CHINA PINGMEI SHENMA GRP KAIFENG XINGHUA FINE CHEM
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Problems solved by technology

This production method not only has a long production process route, many production links,

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  • Method for producing sodium saccharin

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] According to process flow chart, the concrete processing steps of production method of the present invention are as follows:

[0023] 1. Amidation reaction: Put ammonia water with a mass ratio of phthalic anhydride to ammonia water added in the amidation reaction kettle at a ratio of 1:0.1, start stirring, ventilate, and cool down with condensed brine at a temperature of about -15°C. When the temperature drops to about 0°C, open the baffle of the phthalic anhydride hopper and finish adding phthalic anhydride in about 10 minutes. The mass ratio of the amount of phthalic anhydride added to ammonia water is 1:0.1. When the temperature rises to 50-70°C and the pH value is 7, slowly add liquid caustic soda sodium hydroxide solution with a mass concentration of about 30%. When the pH value is 9, stop adding the sodium hydroxide solution, and ...

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Abstract

The invention discloses a method for producing sodium saccharin. The method comprises the following steps: with phthalic anhydride as a raw material, preparing a sodium saccharin solution with baume degree of 25-40 Be at 60 DEG C through an amidation reaction, an esterification reaction, a diazotization reaction, a substitution reaction, a chlorination reaction, an ammonolysis reaction and a neutralization reaction, decoloring, filtering, concentrating, crystallizing, centrifugally drying and drying to obtain a finished product of sodium saccharin, wherein the ammonolysis reaction comprises: with liquid ammonia as a raw material, reacting liquid ammonia with o-sulfonylchloride methylbenzoate obtained in the chlorination reaction to generate o-sulfonamide methylbenzoate. The production method can be used for shortening the process route, reducing the production procedures, lowering the production cost, as well as reducing the ammonia nitrogen emission in production wastewater, the emission of 1 moL NH4<+> can be reduced in each production of 1 moL sodium saccharin, so that the ammonia nitrogen emission in the production wastewater can be decreased by 50% to benefit environmental protection.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a production method of sodium saccharin. Background technique [0002] The traditional production process of sodium saccharin is: use phthalic anhydride as raw material to undergo amidation reaction, esterification reaction, diazonium reaction, replacement reaction, chlorination reaction, ammoniation reaction, acid precipitation, neutralization reaction, and prepare sodium saccharin solution. The solution is decolorized, concentrated, crystallized, dried and dried to obtain the finished product of sodium saccharin. The ammonification reaction in the traditional production process of sodium saccharin is to use ammonia water as a raw material to react with methyl o-sulfonyl chlorobenzoate obtained by chlorination to generate ammonium o-sulfonylbenzimide. The production method not only has a long production process route, many production links, high production cost, but a...

Claims

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Application Information

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IPC IPC(8): C07D275/06
CPCC07D275/06
Inventor 齐枫楠杨国新赵利宽李建民刘辉郭胜程广宇焦福禄高兰真王颖王海平张莹吴军甫
Owner CHINA PINGMEI SHENMA GRP KAIFENG XINGHUA FINE CHEM
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