| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method which can downsize downstream facilities by leveling the capacity of a vacuum pump and is excellent in safety in an operation method for adsorbing and recovering hydrocarbons by a PSA process from waste gas containing gaseous hydrocarbons. SOLUTION: In an operation method for recovering hydrocarbon vapor, an adsorption apparatus which does adsorption and desorption alternately is used, waste gas containing gaseous hydrocarbons is passed through one adsorption apparatus 2a, the hydrocarbons are adsorbed by an adsorbent, the waste gas substantially not containing the gaseous hydrocarbons is released in the air, during the operation, the other adsorption apparatus 2b is changed over into a desportion apparatus, the gaseous hydrocarbons adsorbed on the adsorbent are sucked by a vacuum pump 3 to be separated from an adsorption layer. In a method for recovering the gaseous hydrocarbons from the separated purge gas, the pressure of the suction side of the vacuum pump 3 is controlled to level the amount of sucked gas in a desorption process.</p> |
