High-purity oxygen
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Table of Contents
1 Physical Properties
2 Chemical Properties
Method of Preparation and Applications
4 Oxygen Purity
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1 Physical Properties Edit
high purity oxygen
Molecular Formula: O2
Dust (φ≥0.5μm) ≤ 3.5 particles/L, impurity content N2 ≤ 10 cm3/m3, Ar ≤ 5 cm3/m3, H2O ≤ 1 cm3/m3, CO2 ≤ 0.5 cm3/m3. Colorless, odorless, and tasteless gas. Oxygen is not flammable but supports combustion. Relative density ds (21.1°C, air = 1) 1.105. Gas density 1.326 kg/m3 (21.1°C, 101.3 kPa); liquid density 1141 kg/m3 (-182.96°C). Boiling point -182.96°C. Melting point -218.78°C. [1]
2 Chemical Properties Edit
Ring-shaped and chain-shaped structural elements can react with oxygen, these reactions are called oxidation reactions, and the compounds produced by these reactions (consisting of two elements, one of which is oxygen) are called oxides. Generally speaking, the aqueous solutions of non-metal oxides are acidic, while the oxides of alkali or alkaline earth metals are alkaline. Additionally, almost all organic compounds can combust vigorously in oxygen to produce carbon dioxide and water. Chemically, the reaction of substances with oxygen has been defined as an oxidation reaction, and redox reactions refer to reactions involving the transfer or shift of electrons. [1]
Method of Preparation and Applications
Method of Preparation
Most oxygen is produced through air separation, where air is liquefied and then purified through distillation. The低温全精馏法 can also be used. Other purification methods include pressure swing adsorption and membrane separation. [2]
Application
High purity oxygen is used in chemical vapor deposition of silicon dioxide; as a reagent for producing high purity water; dry oxidation; mixed with carbon tetrafluoride for plasma etching. The primary applications of oxygen stem from its ability to sustain life and its flame-supporting properties; it is widely used in the metallurgical industry. It can also be used for water treatment. All oxidation reactions and combustion processes require oxygen, such as removing sulfur and phosphorus impurities during steelmaking, where a mixture of oxygen and acetylene burns at temperatures up to 3500°C, used for welding and cutting steel. Oxygen is necessary for glass manufacturing, cement production, mineral roasting, and hydrocarbon processing. Liquid oxygen is also used as rocket fuel, being more cost-effective than other fuels. [2]
4 Oxygen Purity Edit
Pure Oxygen, High Purity Oxygen, Ultra Pure Oxygen (GB/T14599-2008)
Project Name: Specification
Ultra-Pure Oxygen, High-Purity Oxygen, Pure Oxygen
Hydrogen (H2) volume fraction/10 ≤ 0.1 0.5 1
Argon (Ar) volume fraction/10 ≤ 0.2
Volume fraction of Nitrogen (N2) / 10 ≤ 0.1 5 20
Total Hydrocarbon Content (by methane) /10 ≤ 0.1 0.5 2
CO2 Content/10 ≤ 0.1 0.5 1
Moisture/10 ≤ 0.5 2 3
Note: Purity and concentration in the table are expressed as volume fractions (V/V).
5 Points for Attention
1) Carefully inspect the spherical part of the cylinder shoulder for markings before use. Pay special attention to the "Next Pressure Test Date." And conduct technical inspections of the cylinder regularly as required during use. Do not use cylinders beyond the inspection deadline.
2) When in use, perform an external inspection first, focusing on the bottle valve, threaded pipe, and pressure reducer. If leaks, loose threads, erratic gauge movement, or "climbing" are detected, repairs should be made promptly; avoid haphazard handling. Do not tighten valve rods under pressure or adjust packing material. Use soap and water to check for leaks; do not use open flames. When gas cylinders and electric welding are used in the same area, place an insulating material under the cylinder bottom to prevent the cylinder from becoming electrified. Pipelines and equipment in contact with the cylinder should have grounding devices to prevent fire or explosion due to static electricity. In winter, if using electric batteries, the bottle valve or pressure reducer may frost over, and should be defrosted with hot water or steam; avoid using fire to bake or using metal tools to strike the valve, and do not forcefully turn the pressure reducer's adjustment screw to prevent a large gas release causing an accident.
3) During the use and storage of high-purity oxygen cylinders, avoid severe vibration and impact. Handle the cylinders with care, using only designated lifting frames or small carts; do not lift cylinders directly with wire ropes. When in use or storage, secure the cylinders with railing or brackets to prevent tipping.
4) Oxygen cylinders should be kept away from high temperatures, open flames, and splashes of molten metal [more than 10 meters (m) away]. Do not expose them to direct sunlight during summer use.
5) Slowly open the bottle valve or pressure reducer to prevent the discharge of static sparks from high-speed gas streams, collision heat and friction heat from solid particles, and heat released when the gas is suddenly compressed (adiabatic compression), which could cause the oxygen cylinder and pressure reducer to explode and catch fire.
Product Brand: Nianlong
Packaging: Steel Cylinder
Spec: 40L
Material: Genuine