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Method for preparing high purity oxygen by oxygen-nitrogen liquefying apparatus

A liquefaction device, high-purity oxygen technology, applied in liquefaction, refrigeration, liquefaction, solidification and other directions, can solve the problems of large investment, limited production and refrigeration capacity, etc., to achieve the effect of efficient process, lower production threshold, simple and effective.

Inactive Publication Date: 2011-11-23
ZHEJIANG XIN RUI AIR SEPARATION PLANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it must rely on a large air separation unit, the investment is very large, and the output is limited by the cooling capacity of the air separation unit

Method used

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  • Method for preparing high purity oxygen by oxygen-nitrogen liquefying apparatus
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  • Method for preparing high purity oxygen by oxygen-nitrogen liquefying apparatus

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Experimental program
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Embodiment

[0036] a. The nitrogen output from the oxygen and nitrogen liquefaction device YD is passed into the absorption chamber G1 of the evaporator K1 of the first rectification tower to absorb cooling capacity, converted into liquid nitrogen, and then sent back to the oxygen and nitrogen liquefaction device;

[0037] b. The liquid nitrogen output from the oxygen-nitrogen liquefaction device is sent to the second rectification tower condenser K2 to release the cooling capacity, which is converted into nitrogen and then sent back to the oxygen-nitrogen liquefaction device;

[0038] c. Send the liquid oxygen output from the oxygen-nitrogen liquefaction unit into the first rectification tower to release the cooling capacity, and the components (hydrocarbons, krypton, xenon, etc., mainly methane) whose evaporation temperature is higher than oxygen are discharged (from The discharge pipe at the bottom of the evaporator K1 of the first rectification tower is discharged to a special storage ...

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Abstract

The invention relates to a method for preparing high purity oxygen. The method has the characteristics of high purity oxygen product yield, low investment, and lower cost. The technical scheme of the invention is as follows: the method for preparing high purity oxygen by an oxygen-nitrogen liquefying apparatus, comprises following operation processes of: a, introducing nitrogen gas output by the oxygen-nitrogen liquefying apparatus to an absorption cavity of a first rectifying tower evaporator for absorbing cold and transforming the nitrogen gas into liquid nitrogen, and then conveying the liquid nitrogen back to the oxygen-nitrogen liquefying apparatus; b, conveying the liquid nitrogen output by the oxygen-nitrogen liquefying apparatus to a second rectifying tower condenser for releasing cold and transforming the liquid nitrogen into nitrogen gas, and then conveying the nitrogen gas back to the oxygen-nitrogen liquefying apparatus; and c, conveying the liquid oxygen output by the oxygen-nitrogen liquefying apparatus to the first rectifying tower for releasing cold, discharging the components having evaporating temperature higher than oxygen in a liquid form, conveying other vaporizing gases to an absorption cavity of the second rectifying tower condenser for absorbing cold, discharging the components having evaporating temperature lower than oxygen to atmosphere in a gaseous form, conveying other components to the second rectifying tower for further rectifying, and outputting the obtained liquid high purity oxygen product.

Description

technical field [0001] The invention relates to an air separation method, in particular to a method for preparing high-purity oxygen. Background technique [0002] Oxygen is ubiquitous in nature. People separate and purify high-purity oxygen (≥99.999% v / v using the term in GB / T14599-2008) from compounds or mixtures through various processes, which are now widely used in the production of integrated circuits and semiconductor devices, optoelectronics Industry, preparation of standard mixed gas, scientific research and other fields. At present, industrial batch production of high-purity oxygen mainly realizes the production and purification of oxygen through the following three ways: [0003] (1) Water electrolysis + chemical method [0004] (2) Pressure swing adsorption + chemical method [0005] (3) Low temperature distillation method [0006] Wherein: (one), (two) its technological process of two kinds of methods is the process of gaseous oxygen, and its final product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04
Inventor 唐惠明孙国华张敏沈浩
Owner ZHEJIANG XIN RUI AIR SEPARATION PLANT CO LTD
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