Production method for preparing m-nitrobenzenesulfonic acid by tubular sulfonation reactor

Abstract

The invention discloses a production method for preparing an m-nitrobenzenesulfonic acid by a tubular sulfonation reactor and relates to the production method of a chemical product. A production device comprises a nitrobenzene storage tank (1), a sulphur trioxide storage tank (2), the tubular sulfonation reactor (3), a kettle sulfonation reactor (4), a material delivery pump (5), a spraying pump (6), a connecting pipeline and accessories (a valve, a flow meter, a thermometer, an anti-explosion film, sight glass and the like). Nitrobenzene and a sulphur trioxide sulfonating agent enter the tubular sulfonation reactor (3) in proportion, the tubular sulfonation reactor (3) and the kettle sulfonation reactor (4) are used in series, or the tubular sulfonation reactor (3) is used independently.The invention is applied to continuous or discontinuous sulfonation reaction, good in mixing and heat transfer effects, high in reaction speed, high in production efficiency and high in operational flexibility. The production device and the production method which are provided by the invention are applied to various sulfonation reaction production processes.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a production method for preparing m-nitrobenzenesulfonic acid through sulfonation reaction of nitrobenzene and sulfur trioxide. Background technique [0002] In the past, the industrial production device for sulfonation of nitrobenzene was a jacketed tank-type sulfonation reactor. Sulfur trioxide is added dropwise into the sulfonation reactor, and a coolant is passed into the jacket of the tank-type sulfonation reactor to remove the heat of reaction to maintain a suitable reaction temperature. The kettle-type sulfonation reactor has a small heat transfer area and a low heat transfer coefficient, and cannot effectively remove the heat of reaction, which limits the rate of sulfur trioxide addition, resulting in a long production cycle and low production efficiency; in the kettle-type sulfonation reaction production method Sulfur trioxide is added dropwise into the tank. ...

AI Technical Summary

Problems solved by technology

The tank-type sulfonation reactor has a small heat transfer area and a low heat transfer coefficient, and cannot effectively remove the heat of reaction, which limits the rate of sulfur trioxide addition, resulting in a long production cycle and low production efficiency; in the tank-type sulfonation reaction production method Sulfur trioxide is added dropwise into the tank. Even if there is stirring, the rapid dispersion of the drippings cannot be achieved, so the concentration of the material in the tank is unevenly distributed, and local overheating cannot be avoided; in the tank-type sulfonation reaction production method, the reaction The residence time of the product in the kettle is uneven, and the product formed in the early stage is prone to deepening reaction

Local overheating in the kettle and uneven residence time of the reactants in the kettle are the insurmountable shortcomings of the kettle-type sulfonation reaction

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