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N-butane gas

N-Butane gas Appearance and properties: colorless gas Density: 0.579 g/mL at 20℃(lit.) Boiling point: −0.5℃(lit.) Melting point: −138℃(lit.) Flash point: −60℃ ...

Release time：2025-04-26

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N-Butane gas

Appearance and properties: colorless gas

Density: 0.579 g/mL at 20℃(lit.)

Boiling point: −0.5℃(lit.)

Melting point: −138℃(lit.)

Flash point: −60℃

Refractive index: 1.3326

N-Butane gas production method

1. Oilfield gas and wet natural gas are separated by pressurized condensation to obtain propane; butane liquefied petroleum gas is separated by distillation to obtain butane.

2. The C4 fraction of petroleum cracking is separated from the gas obtained by distillation at room temperature and pressure in the refinery, and reformed; catalytic cracking; coking; thermal cracking; hydrocracking liquefied gas can obtain a large amount of C4 fraction, which can be reformed; the C4 fraction obtained by hydrocracking and atmospheric and vacuum distillation is mainly butane (n-butane and isobutane). The C4 fraction produced by the ethylene unit also contains butane. For example, the yield of butane in the intermediate deep cracking product of naphtha is 0.19% (weight ratio), accounting for 6.5% of the C4 fraction. The tail gas from the catalytic cracking unit is fractionated to separate the C3 fraction. After the isobutylene and C5 fractions are sent from the bottom of the tower to the pre-acetonitrile extraction distillation tower, more than 90% of normal butane is obtained from the top of the tower.

3. Using industrial crude butane (C4H1080%~90%) as raw material and molecular sieve as adsorbent for adsorption and refining, butane with a purity of 98% can be obtained. After distillation to remove light components, the product purity can reach more than 99.99%.

Uses of N-Butane gas

1. Mixed with propane as liquefied petroleum gas, it is widely used for home heating, cooking and industrial heating. In addition, it is also widely used as a raw material for organic synthesis. For example, butene and butadiene can be obtained through dehydrogenation; isobutane can be obtained through isomerization; maleic anhydride, acetic acid and acetaldehyde can be obtained through catalytic oxidation; halogenated butane can be obtained through halogenation; nitrobutane can be obtained through nitration; carbon disulfide can be obtained through high-temperature catalysis; and hydrogen can be obtained through steam reforming. Butane can also be used as an engine fuel mixture to control volatiles; it can also be used as a deasphalting agent for heavy oil refining; a solvent for oil well wax precipitation; an oil spill agent for secondary oil recovery; a resin foaming agent; a refrigerant for converting seawater into fresh water; and an olefin Ziegler polymerization solvent.

2. Used in organic synthesis and ethylene manufacturing, as a raw material for synthetic rubber and high-octane liquid fuels, as a civilian fuel, solvent, refrigerant, and also for instrument calibration.

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