Device and method for preparing krypton-xenon concentrate in liquid oxygen

A technology of concentrate and liquid oxygen, applied in separation methods, chemical instruments and methods, inert gas compounds, etc., can solve the problems of complex process, weak safety, high cost, and achieve simple process, high safety, and working process. Environmentally friendly effect

Pending Publication Date: 2019-01-29
瀚沫能源科技(上海)有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention patent "201410036253.4 An Equipment and Method for Extracting Crude Krypton and Xenon from Liquid Oxygen" uses complex processes, so the cost will be high
The impact of nitrous oxide is not considered, and the safety is weak

Method used

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  • Device and method for preparing krypton-xenon concentrate in liquid oxygen

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] as attached figure 1 As shown, the liquid oxygen produced by air separation (1200Nm 3 / h, slightly positive pressure, the ingredients contained in this embodiment are: O2: 99.7%; Kr: ~109ppm; Xe: 17ppm; Methane: ~33ppm; other components: argon), through the liquid oxygen pump 6 After being pressurized to 0.3MPaA, it is sent to the cold box through the pipeline LO-201, firstly enters the low-temperature adsorber 8 to remove trace nitrous oxide and carbon dioxide, and then is sent to the middle of the rectification tower to participate in rectification and concentration. The operating pressure of the rectification tower 4 involved in rectification and concentration is 0.18MPaA, and the boiling point temperature of the mixture (air separation liquid oxygen: mainly liquid oxygen) under this pressure is -177.3°C. The air-separated liquid...

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Abstract

The invention relates to a device and method for preparing krypton-xenon concentrate in liquid oxygen. The device comprises a liquid oxygen pump, a rectification tower, a main heat exchanger, a condensing evaporator, a nitrogen circulation compressor and a low temperature adsorber, and the concentration method comprises the steps: (1), adopting the liquid oxygen pump to pressurize the liquid oxygen generated after air separation, and then inputting the pressurized liquid oxygen into the low temperature adsorber through a pipeline for impurity removal treatment; (2), inputting the liquid oxygenobtained after the impurity removal treatment into the middle part of the rectification tower through a pipeline for rectification concentration, wherein rectification concentration includes evaporation and condensation, both a heat source of evaporation and a cold source of condensation are supplied through nitrogen cycle conversion; and (3), discharging the krypton-xenon concentrate in the liquid oxygen obtained after rectification concentration from a krypton-xenon concentrate outlet at the bottom of the rectification tower. The method has the advantages of a simple process, high safety, low cost and low energy consumption, and supply of liquid nitrogen, supply of liquid oxygen or simultaneous production of liquid nitrogen and liquid oxygen can be performed according to customer needswhile the krypton-xenon concentrate is produced.

Description

technical field [0001] The invention relates to the field of liquid concentration, in particular to a device and method for concentrating krypton-xenon concentrate in liquid oxygen. Background technique [0002] The content of krypton and xenon in the atmosphere is about 1.138×10 -6 and 0.0857×10 -6 After the trace amount of krypton and xenon enter the cryogenic rectification tower of the air separation unit with the air, the high boiling point components krypton, xenon, hydrocarbons (mainly methane) and fluorides are all accumulated in the liquid oxygen of the low pressure tower. [0003] If you want to concentrate krypton and xenon on the built-up external compressed air separation equipment, the usual way is to send liquid oxygen into an additional rectification tower (commonly known as poor krypton tower) for rectification. A krypton-xenon-depleted concentrate with a krypton-xenon content of 0.2-0.3% Kr+Xe can be obtained, wherein the methane content is about 0.3-0.4%....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B23/00B01D3/14
CPCB01D3/148C01B23/0036C01B23/0057
Inventor 郝文炳
Owner 瀚沫能源科技(上海)有限公司
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