Device and process for refining rare gases of krypton and xenon and producing ultrapure oxygen

Abstract

The invention belongs to a device and a process for refining rare gases of krypton and xenon and producing ultrapure oxygen. The device comprises a liquid oxygen storage tank; the liquid oxygen storage tank is connected with a primary concentration tower through a liquid oxygen pump and a low-temperature adsorption tower; a tower bottom liquid phase outlet of the primary concentration tower is connected with a catalytic oxidation system with a high pressure throttle valve at the tail end; the high pressure throttle valve is connected to a krypton-xenon separation tower used for storing and separating krypton from xenon through a pipe side of a return cooler, a secondary concentration tower, a krypton-xenon deoxygenation tower, and a gas heating device in sequence; the bottom of the krypton-xenon separation tower is connected to an xenon charging system through a first valve; and the middle-upper part of the krypton-xenon separation tower is connected to a krypton charging system through a second valve. The device and the process for refining the rare gases of the krypton and the xenon and producing the ultrapure oxygen has the advantages of simple structure, reasonable flow design,relatively low cost, safe operation, high yield, high purity of the rare gases, economical efficiency, wide application range, and capacity of effectively classifying and recycling oxygen on the premise of preparing the krypton and the xenon.

Description

technical field [0001] The invention belongs to the technical field of air cryogenic separation, and specifically relates to a production device and production process for refining rare gas krypton-xenon and ultra-pure oxygen. Background technique [0002] As rare gases, krypton and xenon are widely used in lighting, space satellite and medical industries. Air is the main source of these rare gases. The content of krypton in the air is 1.14ppm, and the content of xenon is 0.086ppm. Krypton and xenon are mainly extracted from the by-products of the air separation plant. [0003] With the development of large-scale air separation equipment, the extraction of rare gases from large-scale air separation equipment contains huge economic value. There are generally two methods for the extraction of traditional krypton and xenon: one is the external compression process air separation equipment that mainly produces gas and oxygen products, and the krypton and xenon are pre-concentrat...

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Problems solved by technology

Because the small amount of oxygen partially separated during the refining process cannot be recovered well, resulting in waste of resources

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