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Method for preparing high purity oxygen by double-tower low temperature rectification

A low-temperature rectification, high-purity oxygen technology, applied in the fields of oxygen preparation, refrigeration and liquefaction, lighting and heating equipment, etc., can solve the problems of high price of adsorbent materials and small production scale of products, achieve low loss of cooling capacity and reduce height , good heat exchange effect

Inactive Publication Date: 2010-09-08
WUHAN HUAXING IND & TECH +1
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Problems solved by technology

[0003] High-purity oxygen is produced by normal temperature adsorption method, and its technical indicators can meet the requirements of high-purity oxygen for electronic grade, but the requirements for raw material oxygen are relatively high, and the oxygen content is ≥99.95%, which cannot be achieved by general industrial oxygen; the selected adsorption The price of materials is high, and the production scale of products is relatively small

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  • Method for preparing high purity oxygen by double-tower low temperature rectification
  • Method for preparing high purity oxygen by double-tower low temperature rectification

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Embodiment Construction

[0026] The invention is discussed in more detail below with reference to the accompanying drawings of examples. Referring now to Figure 1,

[0027] The method for preparing high-purity oxygen by double-column low-temperature rectification includes:

[0028] a. Two structured packing rectification towers with condenser D at the bottom and evaporator C at the top, rectification tower I and rectification tower II, each rectification tower is divided into upper, middle and lower rectification sections, rectification A main heat exchanger B is arranged outside the distillation column;

[0029] b. The raw material of industrial liquid oxygen 1 with a pressure of 0.2MPa and a temperature of 95K is directly introduced into the middle section of the rectification tower I, and through low-temperature rectification in the tower, a component with a pressure of 0.13MPa and a temperature of about 93K and containing 7.5% argon is produced Gas 2 is discharged from the top of the tower, the ...

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Abstract

The present invention provides double tower low temperature rectification process of preparing high purity oxygen. Industrial liquid oxygen material with oxygen content of 99.6 % is low temperature rectified in two structured packing towers to obtain electronic industry level high purity oxygen of oxygen content not lower than 99.9998 % and impurity contents including N2 not more than 0.5 ppm, CH4 not more than 0.1 ppm, H2O not more than 0.1 ppm, and Ar not more than 0.5 ppm. The process of preparing high purity oxygen has best utilization of energy, low cold loss, low power consumption and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of oxygen production by low-temperature rectification, in particular to a method for preparing high-purity oxygen by double-tower low-temperature rectification. Background technique [0002] The preparation of high-purity oxygen by low-temperature rectification is a very mature industrial method, but at present, it is attached to the large-scale air separation plant cold box, and high-purity oxygen is prepared by single-column rectification. There is no independent general industrial method. Equipment for producing and purifying oxygen from oxygen. Because it adopts single-column rectification, its purity technical index can only meet the requirements of GB / T14599-93 "High Purity Oxygen", and the oxygen purity is ≥99.999%. The content of other impurities is: N 2 ≤5ppm; CH 4 ≤0.5ppm; H 2 O≤2.5ppm; Ar≤2ppm. This high-purity oxygen cannot meet the technical requirements of the electronic industry level for oxygen pu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02C01B13/02
CPCF25J3/08F25J2200/02F25J2200/30F25J2210/42F25J2215/56F25J2220/50F25J2220/52F25J2270/904
Inventor 张世田鲁仲水
Owner WUHAN HUAXING IND & TECH
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