Preparation device and method of 2,3-difluoro-5-chloropyridine

Abstract

The invention relates to a preparation device and method of 2,3-difluoro-5-chloropyridine. A temperature difference along an air column is formed through evaporation-condensation of a heat conducting liquid, so that a dynamic air pressure difference for air flow flowing is provided for nitrogen in a kettle cavity; and materials are heated in an externally-wrapped mode through the heat conducting liquid, the interiors of the materials are heated in an aeration mode in combination with flowing nitrogen, and the materials are pushed to rotate in the circumferential direction through aeration aerodynamic force, so that the uniform stirring and heating effects are achieved. The evaporated-condensed heat conducting liquid effectively leads out part of heat in a kettle cavity, so that the risk of overhigh internal pressure caused by overhigh temperature in a closed space is effectively prevented according to the PV / T principle, and the safety is improved. The device is simple in structure, convenient to use, good in heating effect, uniform and stable, effectively utilizes pressure difference caused by temperature difference to provide power for airflow, then utilizes the power to heat and stir materials from the interior of the materials, effectively improves the reaction efficiency, and has high practicability and wide applicability.

Description

Technical field [0001] The present invention relates to a preparation apparatus and method, and more particularly to a preparation apparatus and method for 2,3-difluoro-5-chloropyridine. Background technique [0002] Most of the preparation devices of the existing 2,3-difluoro-5-chloropyridine use a closed reactor, the internal stirring material and heated. [0003] However, in a closed space, the mixing device of the reaction kettle, the friction of the reactant and the material, gradually increases the temperature in the reaction kettle, after a long time reaction, the temperature in the actual reaction kettle gradually increases and high The setting temperature is not perceived, it is not conducive to constant temperature, and when the temperature is increased, it is easy to generate a risk. Inventive content [0004] In order to solve the shortcomings of the prior art, it is an object of the present invention to provide a preparation apparatus and method for 2,3-difluoro-5-c...

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Problems solved by technology

[0003] However, in the confined space, the stirring device of the reactor will gradually increase the temperature in the reactor due to the friction of the materials for a long time. After a long time of reaction, the actual temperature in the reactor will gradually increase and increase. It is not easy to detect at the set temperature, which is not conducive to constant temperature, and when the temperature rises and the pressure is too high, it is easy to cause danger

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