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Abstract
The technological sequence of processing the neon-helium mixture, which includes the utilization of the helium-based stripping fraction, is considered. Ukraine is deprived of gas fields that contain helium in concentrations sufficient for industrial production. Therefore, the processing of helium by-products for domestic industry is extremely important. Separation of Ne-He mixtures is usually carried out by low-temperature adsorption. In addition to pure helium, concentrated mixtures of neon are formed in the adsorbers, which can be a raw material in the cryogenic production of neon. This step allows you to create a virtually waste-free resource-saving process for the production of light rare gases. The implementation of this technical solution is associated with a number of technological limitations. In particular, the processing of the reverse flow of neon (after removal from the stripping of the main particle of helium) is possible in the case of a sufficient concentration of Ne. Ideally, the neon content in such a stream should not be lower than in the initial crude mixture before the distillation unit. To maintain the optimal concentration of neon in the reverse flow, it is proposed to dispose of the stripping in two stages. In the first stage, the mixture is separated in a membrane module and the first stream of neon concentrate is formed from it. Due to the partial extraction of neon, the residual mixture is enriched with helium and its processing by cryogenic adsorption is simplified. The proposed scheme of separation of the secondary helium concentrate allows you to automatically maintain a given concentration due to the balance of flows at the outlet of the membrane module. Preliminary separation of the mixture in the membrane helps to save refrigerant (liquid nitrogen) by reducing the load on the adsorption unit for helium. The combined system of separation of a mixture of light rare gases allows to obtain helium with a concentration of 99.999… 99.9999%
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References
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