Lighter is a small ignition device. It is mainly used for lighting fire, smoking, cooking and so on. The main components of lighter are ignition mechanism and gas storage box. When the ignition mechanism moves, the generator ignites the gas area to ignite the gas. According to the characteristics of ignition mechanism, lighters can be divided into flint steel wheel lighters, piezoelectric ceramic lighters, magnetic induction lighters, battery lighters, solar lighters and microcomputer lighters. The gas used in lighters is mainly combustible gas. Early use of gasoline. Butane, propane and liquefied petroleum gas are widely used today. The originator of modern lighters can be said to be16th century European tinder box and CHUCK-MUCKRS tinder box with the same name. [1] They all work on the same principle, using lighter iron to generate sparks to ignite flammable materials. The difference is that the tinder box is chained to one side, while the tinder box is completely integrated. The latter belongs to China. Shortly after the first pistol came out in the world, the first early lighter appeared, because it was changed from a pistol and called a tinder pistol. This kind of lighter has long been used as a status symbol and office decoration. It was invented by Alfred Danhill. Modern lighters can be divided into liquid lighters and gas lighters according to the fuel used; According to the ignition mode, it can be divided into grinding wheel lighter and electronic lighter.
2. This product exists in oilfield gas, wet natural gas and cracked gas, such as cracking light oil in petrochemical industry to produce ethylene, and the co-production of C4 hydrocarbons accounts for about 40% of ethylene production; C4 hydrocarbons produced by FCC unit in refinery account for about 6% of the production capacity of the unit, and butane can be obtained by separation. 1. Separation from oilfield gas and wet natural gas: LPG containing propane and butane can be obtained after pressure condensation separation, and propane and butane can be obtained after distillation separation. 2. Separation from C4 fraction of petroleum cracking: For example, the butane content in naphtha cracking product is about 65%, and the butane content in heavy distillation cracking product is lower. In some refineries, molecular sieve catalyst and hydrocracking process were used in catalytic units, which led to an increase in butane yield and a decrease in butene yield. Butane separation process is as follows. C3, isobutylene and C5 fractions are separated from the tail gas of the catalytic cracking unit by fractionation, and then enter the Qianyiman rectification tower from the bottom of the tower, and more than 90% of butane is obtained from the top of the extractive rectification tower.
3. The fuel used by lighters is mainly combustible gas. Gasoline was widely used in the early days, but it is rarely used now because of its peculiar smell. Butane, propane and liquefied petroleum gas are widely used. They are pressurized and filled into a closed air box. Once released into the air, they absorb heat, vaporize and expand rapidly, and are easily ignited. Butane (CH3-CH2-CH2-CH3) used in lighters is n-butane, which is the general name of two alkanes and hydrocarbons with the same molecular formula (C4H 10). Include n-butane and isobutane (2- methylpropane). Butane is a flammable, colorless and liquefied gas. It is an important raw material for the development of petrochemical industry and organic raw materials, and its use has been paid more and more attention.