Purifying device and method decarbonizing nitric acid industry tail gas to extract N2O

Abstract

The invention relates to the technical field of chemical substance recycling and provides a purifying device and method decarbonizing nitric acid industry tail gas to extract N2O. The decarbonizing purifying device comprises a dryer provided with water-removing absorbent and pressure swing adsorption equipment provided with decarbonizing absorbent. The method includes: using a washing tower to wash raw material gas, using a buffer tank to remove free moisture in the raw material gas, using first compression cooling device to pressurize the raw material gas, using the dryer to dehydrate the raw material gas, and using the pressure swing absorption equipment to remove non-polar gas in the raw material gas. The method has the advantages that the physical immunity removing and high-pressure throttling refrigeration rectification process is used; compared with a method chemically decarbonizing other tail gas to recycle N2O, the method can avoid waste alkaline liquid secondary pollution and is low in cost and convenient and safe to operate.

Description

technical field [0001] The invention relates to the technical field of chemical substance recovery, in particular, to a method for extracting carbon from nitric acid industrial tail gas and extracting N 2 O purification device and process method. Background technique [0002] Nitrous oxide, also known as nitrous oxide, commonly known as "laughing gas", molecular formula N 2 O. N 2 O is a high-pressure liquefied gas with a boiling point of -88.49°C and a melting point of -90.7°C. It is colorless and has a sweet taste. It is a gaseous oxidant. It is very stable at room temperature and can be decomposed into oxygen and nitrogen at temperatures above 600°C. [0003] N 2 O has a wide range of applications. For example, it can be used as a combustion aid to provide power for rockets, and it can be used in military and aerospace fields; it can be used in the manufacturing processes of integrated circuits, chips, and photovoltaics in the electronics industry; Surgery, gynecolo...

AI Technical Summary

Problems solved by technology

However, the waste liquid produced by alkaline washing has caused secondary pollution to the environment

Especially the by-products of nitric acid tail gas decarbonized by ammonia water, if the ammonia component remains, not only the smell is bad, but when it is used in the medical field, it may cause combustion and explosion accidents due to the need to add oxygen

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