Device for synthesizing nitromethane and separating products

Abstract

The invention relates to the field of chemical engineering and particularly discloses a device for synthesizing nitromethane and separating products. The device comprises a horizontal reactor, a product separation device and a product purification device which are sequentially connected from front to back, wherein a cavity of the horizontal reactor is divided into a plurality of mutually communicated reaction units by virtue of a plurality of flow baffles, a reactor stirring mechanism penetrating through each reaction unit is arranged in the cavity of the horizontal reactor along the axis direction of the horizontal reactor, and the front end of the reactor stirring mechanism stretches out of the side wall of the head end of the horizontal reactor and is connected with a reactor driving mechanism. According to the device, the problem that nitromethane only can be produced in an intermittent manner in a current domestic nitrite substitution method is solved; and by virtue of continuous reaction and rectification operation, the large-scale industrial production can be well realized, the production cost is lowered, the production efficiency is improved, and a lot of problems including environmental pollution and the like are solved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a nitromethane synthesis and product separation device. Background technique [0002] Most of the existing nitromethane synthesis reactions are produced intermittently in simple reactors. During the production process, sodium nitrite solids are manually put into the reactors, and the sodium nitrite solids are dissolved in the reactors and react with dimethyl sulfate. . However, when dimethyl sulfate reacts with sodium nitrite, it also has hydrolysis side reactions with water, reducing the yield of the reaction. In production, in order to reduce the occurrence of side reactions and fully react dimethyl sulfate with sodium nitrite, dimethyl sulfate is usually added dropwise, which can only be operated in batches and intermittently, and the production efficiency is very low. And the production process consumes more manpower. Secondly, the reaction between dimethyl sulfate and sod...

AI Technical Summary

Problems solved by technology

This treatment method has the following disadvantages: first, the nitromethane waste water containing sodium sulfate is very viscous after being concentrated, and the reactor used during concentration is a spherical reactor, and the opening at the bottom of the still body is relatively small, resulting in the concentrated sulfuric acid obtained Sodium is difficult to discharge through the opening at the bottom of the kettle body, and water needs to be added to the reaction kettle again to dilute the sodium sulfate into a paste and discharged from the bottom of the kettle body, and then sent to the centrifuge for dehydration again

The traditional distillation process consumes a lot of steam energy, and the distillation process is a discontinuous process, which increases the input of manpower

In addition, in the process of rectification, if the liquid in the kettle evaporates to dryness due to improper operation, serious safety accidents will occur

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