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A method for efficiently producing high-purity oxygen and high-purity nitrogen

A high-purity oxygen and high-purity nitrogen technology, used in refrigeration and liquefaction, lighting and heating equipment, solidification, etc., can solve the problems of low extraction rate, limit the production of high-purity liquid oxygen, etc., to achieve product safety and reliability, improve safety , widely used effect

Active Publication Date: 2019-06-04
SHANGHAI QIYUAN GAS DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, liquid oxygen is generally used as raw material for the preparation of high-purity oxygen, but its extraction rate is low; while using krypton-xenon crude process, the purity of oxygen after primary and secondary purification reaches 99.5% to 99.99%. It is an excellent raw material for the production of high-purity oxygen, which is characterized by large output and high purity, while the crude release of krypton and xenon has fewer sources of oxygen, which has become the reason for limiting the production of high-purity liquid oxygen

Method used

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  • A method for efficiently producing high-purity oxygen and high-purity nitrogen
  • A method for efficiently producing high-purity oxygen and high-purity nitrogen
  • A method for efficiently producing high-purity oxygen and high-purity nitrogen

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Embodiment 1

[0058] use as figure 1 The process flow method shown produces high-purity oxygen and high-purity nitrogen:

[0059] Purified and dried air 101 (3350NM 3 / h, 0.96MPa) is merged with the backflow air 206, and the air total flow after the described purification and drying after the merger is 7750NM 3 / h, and before being cooled to saturation in the main heat exchanger E1 of the fractionating column, it is divided into two streams:

[0060] One of them 102 directly enters the main heat exchanger E1 of the fractionation tower;

[0061] One of the other 201 (4400NM 3 / h, 0.96MPa) enters the turbo expander ET01 booster end Z01 to pressurize to 1.32MPa to obtain 202, then cools to 40°C through the water cooler E3, and then enters the main heat exchanger E1 of the fractionation tower to cool to -122°C , extract 204 from the middle of the main heat exchanger, and enter the turbo expander ET01 to expand to 0.025MPa to obtain 205, then return to the main heat exchanger E1 of the fracti...

Embodiment 2

[0070] use as figure 2 The process flow method shown produces high-purity oxygen and high-purity nitrogen:

[0071] Purified and dried air 101 (3350NM 3 / h, 0.96MPa) is cooled to saturated state 103 in fractionation column main heat exchanger E1, a part of saturated air 104 (2950NM 3 / h) into the high-pressure rectification tower C1 tower kettle, separated into high-pressure nitrogen 300 and oxygen-enriched liquid air 501 in the high-pressure rectification tower C1; another part of saturated air 105 (400NM 3 / h) Enter the medium-pressure rectification tower reboiler K2 to condense into liquid air 106, and the liquid air 106 is mixed with the oxygen-enriched liquid air 501 in the high-pressure tower kettle to 503, and enter the high-pressure rectification tower condensing evaporator K1 to evaporate into a gaseous state 504, and then enter the medium-pressure rectification tower tower kettle; the nitrogen 404 separated by the high-pressure rectification tower C1 is sent to th...

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Abstract

The invention provides a method for efficient production of high-purity oxygen and high-purity nitrogen. A high pressure rectifying tower, a medium pressure rectifying tower and a low pressure rectifying tower are adopted; a reboiler is arranged at the bottom of the medium pressure rectifying tower, and a condensation evaporator is disposed at the bottom of the low pressure rectifying tower; high pressure nitrogen and oxygen-enriched liquid air are obtained through separation of part of air in the high pressure rectifying tower, and the other part of air enters the reboiler of the medium pressure rectifying tower to be condensed into liquid air; the liquid air and the oxygen-enriched liquid air are mixed, then enter a condensation evaporator of the high pressure rectifying tower to be evaporated into a gas state and then enter the medium pressure rectifying tower; and then a high-purity nitrogen product and oxygen-enriched liquid are obtained through separation in the medium pressure rectifying tower, and the oxygen-enriched liquid enters the low pressure rectifying tower to be rectified, so that a high-purity liquid oxygen product is obtained. The high-purity liquid oxygen and the high-purity nitrogen can be produced at the same time; the extraction ratio of the high-purity nitrogen reaches 60%-75%, and the extraction ratio of the high-purity oxygen reaches 70%-72%; and according to the method, air is used as a raw material which is economical and practical, the products are safe and reliable and can be widely applied, and the market prospects are good.

Description

technical field [0001] The invention belongs to the field of gas production, and relates to a method for gas separation through low-temperature liquefaction, in particular to a method for efficiently producing high-purity oxygen and high-purity nitrogen. Background technique [0002] With the rapid development of electronics, chemical and other industries, the demand for high-purity nitrogen and high-purity oxygen has increased sharply, and the purity of industrial oxygen is usually 99.6%O 2 , while the purity of high-purity oxygen required by the electronics industry is >99.9999% O 2 ; In the precision electronics industry, high-purity oxygen is usually used for chemical vapor deposition of silicon dioxide, or as an oxidation source and a reactant to produce high-purity water; or for dry oxidation; or mixed with carbon tetrafluoride for plasma etch etc. [0003] At present, liquid oxygen is generally used as raw material for the preparation of high-purity oxygen, but i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J3/04054F25J3/0406F25J3/04066F25J3/04109F25J3/04436F25J3/0429F25J3/04357F25J3/04454F25J2200/52F25J2200/54F25J2215/40F25J2250/20
Inventor 周大荣俞建
Owner SHANGHAI QIYUAN GAS DEV
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