Oxygen-nitrogen removal neon-helium separation and purification method

Abstract

The invention provides an oxygen-nitrogen removal neon-helium separation and purification method. The method comprises the specific steps that oxygen nitrogen neon helium mixed raw material gas subjected to dehydrogenation drying treatment is pressurized and enters a low-temperature cooling box to be cooled, oxygen, nitrogen and other impurities in the raw material gas are removed through low-temperature condensation and low-temperature adsorption, obtained pure neon-helium mixed gas continues to be cooled, high-purity neon is obtained through low-temperature condensation and low-temperature rectification separation, the rest rough helium containing neon is cooled again after being independently reheated, the neon is removed through low-temperature adsorption and low-temperature refrigeration, and high-purity helium is obtained. According to the method, a low-temperature refrigerator and liquid nitrogen are mainly adopted as a cold source and can provide stable cold energy for a system, in addition, the system is low in operation pressure, on the basis that the functions are achieved, the procedure is more simplified, through low-temperature adsorption related in the method, adsorption gas can be recycled after adsorption saturation, the utilization rate of the raw material gas is greatly increased, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for separating and purifying helium-neon gas, in particular to a method for removing oxygen and nitrogen and separating and purifying neon-helium. Background technique [0002] Neon and helium are rare inert gases, which are very important in high-end fields such as nuclear magnetic resonance, optical fiber, submarine, aviation, aerospace, scientific research and nuclear weapons. [0003] Helium is a non-renewable limited resource, which is mainly separated and purified from helium-rich natural gas. The helium resources of the United States account for more than 50% of the world, plus the helium resources it controls in the Middle East and other regions, more than 90% of the helium resources in the world are controlled by the United States, and have been listed as strategic resources. [0004] Neon gas is also a rare gas. At present, the output of neon gas in the world is about 375 million liters, and these products a...

AI Technical Summary

Problems solved by technology

Especially in recent years, due to changes in the market environment, the price of neon gas has risen sharply, which has brought great challenges to domestic production and research.

[0005] In the industry, neon and helium are mainly extracted from the air separation unit, usually using low-temperature condensation and low-temperature adsorption methods, mainly using liquid nitrogen, liquid neon, and liquid hydrogen as cold sources for low-temperature condensation and low-temperature adsorption. This traditional method and the corresponding The technological process leads to complex equipment and requires high operating pressure. During the operation, the temperature, flow control and system cooling supply stability are poor, and the purity of the obtained gas is low.

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