A kind of nitration reactor for producing p-nitrotoluene from toluene

Abstract

The invention discloses a nitration reactor for producing p-nitrotoluene from toluene, which comprises a reaction kettle and an agitation reinforcement assembly, the agitation reinforcement assembly is installed in the reaction kettle, and the agitation reinforcement assembly plays the role of enhancing the uniformity of material stirring in the reaction kettle , in the present invention, under the action of the upward carrying force and centrifugal force of the auger, the material will be continuously thrown upwards obliquely, and the thrown material will be blocked by the spiral heat exchange plate and then squeezed along the bottom surface of the spiral heat exchange plate. Falling down obliquely, and the agitating blades of the helical heat exchange plate and the auger are helical, so that the materials at different depths of the reactor can be subjected to the double mixing effect of extrusion and stirring, which greatly improves the mixing degree of the materials. It is beneficial to improve the generation of nitrate. The present invention installs a spiral heat exchange plate in the reaction kettle, and a heat exchange channel is opened inside the spiral heat exchange plate, which is convenient for heat exchange with the reactants in the reaction kettle to achieve the effect of cooling, and the low temperature is conducive to Nitrate formation.

Description

technical field [0001] The invention relates to the technical field of nitration reactors, in particular to a nitration reactor for producing p-nitrotoluene from toluene. Background technique [0002] In industrial production, the more commonly used nitrating agent for introducing nitro groups into molecules is nitric acid. In the existing industrial production, great efforts and explorations have been made to improve the formation of nitrates. The aromatic nitro compounds prepared by nitration reaction It is an organic chemical raw material and intermediate with a wide range of uses. It can be used in the synthesis of agricultural chemicals, medicines, dyes, explosives, and rubber additives. The uniformity of material mixing and the difference in temperature will affect the yield of nitrate. HowNet , published by China Chemical Engineering Seventh Construction Co., Ltd. in "Exploring to Improve the Yield of p-nitrotoluene in Toluene Nitration Reaction", through experiments,...

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Problems solved by technology

[0002] In industrial production, the more commonly used nitrating agent for introducing nitro groups into molecules is nitric acid. In the existing industrial production, great efforts and explorations have been made to improve the formation of nitrates. The aromatic nitro compounds prepared by nitration reaction It is an organic chemical raw material and intermediate with a wide range of uses. It can be used in the synthesis of agricultural chemicals, medicines, dyes, explosives, and rubber additives. The uniformity of material mixing and the difference in temperature will affect the yield of nitrate. HowNet , published by China Chemical Engineering Seventh Construction Co., Ltd. in "Exploring to Improve the Yield of p-nitrotoluene in Toluene Nitration Reaction", through experiments, it is concluded that low temperature is conducive to the formation of p-nitrotoluene. In the existing production process, The degree of material mixing cannot be effectively improved, and in chemical reactions, reaction kettles are often used for reaction and production. The closed design of the reaction kettle itself makes it difficult for operators to effectively control the temperature in the reaction kettle, and furthermore, the nitration reaction The improvement of the yield of the product causes limitation, so people need a kind of nitration reactor of producing p-nitrotoluene by toluene to solve the problem existing in the prior art

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