Method for utilizing oxygen-nitrogen liquefaction device to prepare high-purity oxygen

Abstract

The invention relates to a method for preparing high-purity oxygen and aims at provides a method which has the advantages of high yield, low investment, and lower cost. According to the technical scheme of the invention, the method for utilizing the oxygen-nitrogen liquefaction device to prepare high-purity oxygen comprises the following steps: a, a first rectifying tower evaporator, a first rectifying tower, a main condensate evaporator, a second rectifying tower, and a second rectifying tower condenser are sequentially and fixedly arranged from bottom to top, and then simultaneously carry out subsequent process; b, the nitrogen output by the oxygen-nitrogen liquefaction device absorbs cold energy so as to be converted into liquid nitrogen, the generated liquid nitrogen and the liquid nitrogen output by the oxygen-nitrogen liquefaction device are combined and release cold energy, and the cold energy is converted into a gaseous form so as to be returned the oxygen-nitrogen liquefaction device; and c, the liquid nitrogen output by the oxygen-nitrogen liquefaction device release cold energy, part of components are discharged, the other gas is divided into two paths: first-path gas absorbs cold energy, part of components of the first-path enter into the atmosphere for discharge, and the other components of the first-path is further rectified; and second-path gas absorbs cold energy part of components of the second-path gas enter into the atmosphere for discharge, and the other components of the second-path gas release cold energy, thus the products are obtained.

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 ...

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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

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