Method for recovering ultra-high purity nitrous oxide

Abstract

The invention discloses a method for recovering ultra-high purity nitrous oxide. The method comprises S1, carrying out three-step washing treatment on exhaust gas containing nitrous oxide orderly through a one-step water washing device and a two-step organic solvent washing device, S2, cooling the exhaust gas through a heat exchanger, S3, carrying out two-step adsorption treatment on the exhaust gas through a pressure swing adsorption device and a temperature swing adsorption device, and S4, carrying out two-step rectification treatment on the exhaust gas orderly through a one-step rectification tower and a two-step rectification tower. Through cooperation of the above processes, nitrous oxide in the exhaust gas can be completely separated and ultra-high purity nitrous oxide gas having purity greater than or equal to 99.99999% is obtained. The method meets the requirements on industrial and laboratory ultra-high purity nitrous oxide, greatly reduces environmental pollution caused by the emission of nitrous oxide, realizes recovery and use of nitrous oxide, prevents wastes and saves resources.

Description

technical field [0001] The invention relates to a method for recovering nitrous oxide, in particular to a method for recovering ultra-high purity nitrous oxide. Background technique [0002] Nitrous oxide, also known as laughing gas, is a colorless, sweet-smelling gas oxidant, because it can be decomposed into nitrogen and oxygen at high temperature, so it can support combustion under certain conditions. But it is stable at room temperature, has a slight anesthetic effect, and can make people laugh, and is now mainly used in performances. In August 2009, a new study in the United States showed that nitrous oxide has become the primary ozone-depleting substance emitted by humans, and its single-molecule warming potential is 310 times that of carbon dioxide. One of the greenhouse gases. [0003] Nitrous oxide mainly comes from human production and living processes. The most important source is the tail gas in the chemical industry, such as the production process of nylon an...

AI Technical Summary

Problems solved by technology

The most important source is the tail gas in the chemical industry, such as the production process of nylon and nitric acid. Since the tail gas discharged from these production devices contains a large amount of nitrous oxide, if it cannot be properly treated, it will definitely cause serious damage. environmental issues

[0004] At present, the commonly used treatment method is to absorb the above-mentioned tail gases with activated carbon and then discharge them. Since the treatment method is relatively simple and incomplete, the treated tail gas still contains a large amount of nitrous oxide, so the problem of environmental damage cannot be solved, and the oxidized Nitrous nitrogen is recycled, resulting in waste

In addition, although some other methods for the purification of nitrous oxide have been reported in the prior art, the purity of the obtained nitrous oxide is not higher than 99.9999%, which is difficult to meet the needs of current industries and laboratories. 99.99999% Ultra High Purity Nitrous Oxide Practical Demand

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