High-purity oxygen
Editor
Table of Contents
Physical Properties
2 Chemical Properties
Method of Preparation and Applications
4 Oxygen Purity
5 Points to Consider
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 non-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
Ring-shaped and chain-shaped structural elements can react with oxygen, these reactions being called oxidation reactions. The compounds produced by these reactions (comprising two elements, one of which is oxygen) are known as oxides. Generally, the aqueous solutions of nonmetal oxides are acidic, while the oxides of alkali or alkaline earth metals are basic. Additionally, almost all organic compounds can combust vigorously in the presence of oxygen, producing 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 electron transfer or shift. [1]
Method of Preparation and Applications
Method of manufacture
Most oxygen products are manufactured through air separation. The process involves liquefying air and then purifying it through distillation. The cryogenic complete distillation method can also be used. Other purification methods include pressure swing adsorption and membrane separation. [2]
Applicable
High-purity oxygen is used in chemical vapor deposition of silicon dioxide; as a reagent for producing high-purity water; dry oxidation; and mixed with carbon tetrafluoride for plasma etching. The primary uses of oxygen stem from its ability to sustain life and its flammable properties; it is widely used in the metallurgical industry. It can also be used in 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 also needed in 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: Specifications
Ultra-pure Oxygen, High Purity Oxygen, Pure Oxygen
Hydrogen (H2) volume fraction/10 ≤ 0.1 0.5 1
Argon (Ar) volume fraction ≤ 0.2%
Nitrogen (N2) volume fraction/10 ≤ 0.1 5 20
Total Hydrocarbon Content (based on methane) /10 ≤ 0.1 0.5 2
Carbon Dioxide Content/10 ≤ 0.1 0.5 1
Moisture/10 ≤ 0.5 2 3
Note: Purity and concentration are expressed as volume/volume percentages (V/V).
5 Precautions to Note
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 past their inspection due date.
2) When in use, first perform an external inspection, focusing on the bottle valve, thread connection, and pressure reducer. If leaks, loose threads, malfunctioning gauge movement, or "crawling" are found, immediate repair is required; avoid any casual handling. Do not tighten valve rods under pressure or adjust packing material. Use soap water to check for leaks; do not use open flames. When using gas cylinders and electric welding in the same area, place an insulating material under the cylinder bottom to prevent the cylinder from becoming electrically charged. Pipelines and equipment in contact with the gas 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; never use fire to bake or use metal tools to strike the valve, and do not拧 the pressure reducer's adjusting screw too forcefully to prevent a large gas release and accidents.
3) During the use and storage of high-purity oxygen cylinders, avoid severe vibrations and impacts. Handle the cylinders with gentle lifting and lowering, using only designated lifting frames or small carts. It is prohibited to hoist oxygen cylinders directly with steel cables. When in use and storage, secure the cylinders with railing or brackets to prevent them from toppling.
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 reducer to prevent static spark discharges from high-speed gas flow, collision heat and friction heat from solid particles, and heat released during sudden compression of the gas (adiabatic compression), which could cause an explosion and fire in the oxygen cylinder and reducer.
Product Brand: Nianlong
Packaging: Steel Cylinder
Specification: 40L
Material: Genuine