Nitrous oxide preparation device and method

Abstract

The invention provides a nitrous oxide preparation device and method.The nitrous oxide preparation device comprises a reaction separator, a heating reactor and a condensation collection unit, a loweroutlet of the reaction separator is connected with a lower inlet of the heating reactor, and an upper outlet of the heating reactor is connected with a middle inlet of the reaction separator; an upperoutlet of the reaction separator is connected with an inlet of the condensation collection unit; a spraying assembly and a filler assembly are arranged at the upper part in the reaction separator; and the position of the reaction separator is higher than that of the heating reactor. According to the device, through the arrangement of the reaction separator and the heating reactor, self-circulation of reaction materials between the reaction separator and the heating reactor is achieved, the liquidity of ammonium nitrate raw materials is improved, the temperature of all positions is kept uniform, accurate control over the temperature of the reaction materials is facilitated, and meanwhile the heat exchange efficiency and the reaction rate are improved; due to the improvement of the device,the device can continuously and stably operate, the safety is greatly improved, and efficient preparation of nitrous oxide is realized.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and relates to a preparation device and method of nitrous oxide. Background technique [0002] As an important industrial gas, nitrous oxide is mainly used in the medical field and the electronic industry. In traditional applications, it is mainly used as an anesthetic. With the development of modern industry, high-purity nitrous oxide is more and more widely used in the electronic industry. , which is an important material for the development of semiconductor technology. It is mainly used in technical fields such as integrated circuits and liquid crystal displays. The demand is increasing. Therefore, how to efficiently and safely prepare nitrous oxide is also indispensable. [0003] At present, the main preparation methods of nitrous oxide include ammonium nitrate thermal decomposition method, ammonia contact oxidation method and industrial tail gas recovery method, etc. Amo...

AI Technical Summary

Problems solved by technology

At this stage, the conventional ammonium nitrate decomposition reactor usually adopts the method of heating the wall between the reaction kettle and the electric heating rod. The temperature difference is large, and the temperature control cannot be timely and accurate. The ammonium nitrate reacts slowly in the lower temperature part of the kettle, and the ammonium nitrate will decompose violently in the local overheated part near the wall surface, causing safety hazards. The larger the scale of the device, the more difficult it is to ensure stable operation.

[0004] CN 101955167A discloses a technology for decomposing ammonium nitrate to produce nitrous oxide. The system is mainly composed of a reaction kettle with a feeding port, a cooling tower, a dryer, a rectification tower, a buffer tank, a compressor, and a condenser according to the system functions. It is composed of connecting pipelines and assembled into one body. However, this system is still a traditional ammonium nitrate decomposition device. The reactor has not been clearly improved, and there is still the problem of difficult temperature control. The setting of subsequent devices is only to purify and refine the reaction product.

[0005] CN 110329999A discloses a generator and method for producing nitrous oxide by wet decomposition of ammonium nitrate, including a reactor body and a control system, the reactor body is provided with a temperature measuring mechanism for measuring the temperature in the reactor, and a Heating components for raising the temperature of the reaction materials in the kettle, cooling devices for cooling the materials in the kettle; the control system includes a heating controller, a cooling controller and a quenching controller, through the heating controller, cooling controller The cooling controller and the quenching controller respectively control the work of the heating component, the material cooling heat exchanger and the quenching heat exchanger, and the purpose of precisely controlling the reaction temperature is achieved through the cooperative work of the heating component, the material cooling heat exchanger and the quenching heat exchanger; There are multiple additional components for the reactor in the device. Although the reaction temperature can be controlled, the fluidity of the material in a single reactor is poor, the degree of reaction is uneven, the stock of materials is large, and the temperature is not easy to adjust.

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