PURPOSE:A safe and closed system recovering method for hydrocarbon vapours in high yields characterized in using kerosene as absorbent.

PURPOSE:To provide a method which can recover evaporated gas as liquid having little danger of explosion and containing none or a very small amount of air by cooling pressurized evaporated gas to a temperature near the freezing point to liquefy CONSTITUTION:Vapor gas generating when a tank 1 is charged with volatile organic solvent having a freezing point above 0 degC, is introduced into an absorption tower 3 where the vapor gas is contacted with absorption liquid to absorb gas Then air which is not absorbed by absorption liquid, is discharged through an exhaust pipe 8 The absorption liquid discharged from the absorption tower 3 is supplied to a vacuum evaporator 10 where the evaporated gas of organic solvent is separated from the absorption liquid The resulting absorption liquid is supplied from the vacuum evaporator 10 to a liquid supply pipe 6 and then recycled to the absorption tower 3 The evaporated gas separated in the vacuum evaporator 10 is pressurized to a pressure below 2kg/cm , and cooled to a temperature near the freezing point to liquefy and recover Unliquefied gas is introduced into the absorption tower 3 3 where the gas is contacted with the absorption liquid

Method for recovering hydrocarbon vapour

Citations

Recovery of organic solvent from mixed gas of organic solvent and air