Product Category: Acetylene

Product Name: Acetylene Gas, High Purity Acetylene Gas
English Name: Ethyne
Purity: 99.9 (%)
Packaging Specification: 40L
Filling Weight: 2-3 kg
Pressure: 1.6 MPa
Molecular Formula: C2H2

Acetylene Related Parameters

High Purity Acetylene Quality Standards

Uses of High Purity Acetylene

Acetylene, also known as carbide gas, is a colorless, slightly toxic, flammable gas with weak anesthetic properties and the ability to inhibit cell oxidation under normal temperature and pressure. Industrially, it is produced by hydrolysis of calcium carbide, which is rich in calcium carbonate. Its explosive limit in air is 2.5% to 80%. Pure acetylene is odorless, but industrial acetylene often contains impurities such as phosphine and hydrogen sulfide due to the presence of small amounts of calcium sulfides and phosphides in the carbide raw materials, giving it an unpleasant garlic odor. It cannot be liquefied under normal pressure, is poorly soluble in water, but highly soluble in organic solvents such as petroleum ether, ethanol, and benzene, with particularly high solubility in acetone. Therefore, industrial acetylene is often dissolved in acetone, also known as dissolved acetylene. It is mainly used for metal welding and cutting, organic synthesis, atomic absorption spectroscopy, as a standard gas, calibration gas, synthetic rubber, and lighting.

Acetylene gas can be used for lighting, welding, and cutting metals (oxy-acetylene flame), and is also a fundamental raw material for producing acetaldehyde, acetic acid, benzene, synthetic rubber, synthetic fibers, etc.

When acetylene gas burns, it produces high temperatures, with oxy-acetylene flames reaching around 3200°C, making it suitable for cutting and welding metals. With adequate air supply, it burns completely, emitting a bright white light, which can serve as an illumination source in areas without electricity or before the widespread use of electric lights. Acetylene is chemically reactive and can undergo addition reactions with many reagents. Before the 1960s, acetylene was the most important raw material for organic synthesis and remains one of the key raw materials today. For example, it can react with hydrogen chloride, hydrogen cyanide, and acetic acid to generate raw materials for polymer production.

Under different conditions, acetylene gas can undergo various polymerization reactions to form vinyl acetylene or divinyl acetylene. The former, when reacted with hydrogen chloride, yields 2-chloro-1,3-butadiene, a raw material for chloroprene rubber. At high temperatures of 400–500°C, acetylene can undergo cyclic trimerization to form benzene. With nickel cyanide Ni(CN)? as a catalyst at 50°C and 1.2–2 MPa, it can form cyclooctatetraene.

Acetylene gas decomposes into carbon and hydrogen at high temperatures, which can be used to produce acetylene carbon black. Under certain conditions, acetylene polymerizes to form aromatic hydrocarbons such as benzene, toluene, xylene, naphthalene, anthracene, styrene, and indene. Through substitution and addition reactions, a range of highly valuable products can be generated. For example, acetylene dimerizes to form vinyl acetylene, which then undergoes addition reaction with hydrogen chloride to produce chloroprene; direct hydration of acetylene yields acetaldehyde; reaction with hydrogen chloride produces vinyl chloride; reaction with acetic acid yields vinyl acetate; reaction with hydrogen cyanide produces acrylonitrile; reaction with ammonia generates methylpyridine and 2-methyl-5-ethylpyridine; reaction with toluene forms dimethylphenyl ethylene, which can be further catalytically cracked to produce three isomers of methylstyrene; condensation with one molecule of formaldehyde produces propargyl alcohol, and with two molecules of formaldehyde yields butynediol; addition reaction with acetone produces methylpropynol, which can further react to form isoprene; reaction with carbon monoxide and other compounds (such as water, alcohols, thiols) produces acrylic acid and its derivatives.

Acetylene gas, combined with oxygen, forms an oxy-acetylene flame with temperatures up to 3200°C, commonly used for metal cutting in shipbuilding and steel structures.

High purity acetylene gas is used in instruments such as atomic absorption spectroscopy.

Acetylene is used in the synthesis of pharmaceuticals and chemical intermediates like vinyl acetylene or divinyl acetylene.

It is used for transformer oil analysis.

At 400–500°C, acetylene undergoes cyclic trimerization to form benzene; with nickel cyanide Ni(CN)? as a catalyst at 50°C and 1.2–2 MPa, it forms cyclooctatetraene.

High purity acetylene gas is used as a damaging agent in "acetylene bombs" to destroy tanks or other armored vehicles.

Precautions for High Purity Acetylene

Acetylene gas is typically dissolved in solvents such as acetone and porous materials, then stored in steel cylinders. Cylinders should be stored in cool, well-ventilated, dry areas, with storage temperatures not exceeding 40°C. It is best to store them separately outdoors, away from fire sources, heat sources, and direct sunlight. They must be isolated from oxygen, compressed air, oxidizers, fluorine, chlorine, bromine, copper, silver, mercury, copper salts, mercury salts, silver salts, organic peroxides, explosives, toxic substances, and radioactive materials.

When moving acetylene cylinders, use specialized cylinder hand trucks and handle them gently. During transportation, safety caps must be securely fastened to prevent damage to cylinder attachments and avoid hazards.

Use specialized acetylene pressure reducers such as YQE-213 for減壓, and always use acetylene flame arrestors to prevent flashback.

Acetylene cylinders have inspection dates marked on the neck. Expired cylinders must be inspected by authorized pressure vessel inspection units, such as those designated by acetylene distributors like Puyuan Gas. The use of expired cylinders is strictly prohibited.

Acetylene pipelines and equipment must be grounded and tightly sealed. Before use, acetylene gas pipelines should be pressure-tested with nitrogen and leak-tested with soapy water to ensure no leaks.

Industrial acetylene often contains impurities such as phosphine and hydrogen sulfide, which can be toxic. Workplaces must be well-ventilated.