| 摘要 |
<p>PURPOSE:To reduce power by permeating a hydrocarbon vapor from a mixed gas of the hydrocarbon vapor and the air through a gas separating membrane and a vacuum pump which are set up in more than two stages in series, and feeding the vapor into a recovery column which includes and absorbing liquid as its tank storage liquid. CONSTITUTION:A mixed gas 1 of hydrocarbon vapor such as gasoline vapor and the air is mixed with a return gas 14, and is fed in a gas separating membrane 4 of a first stage, the hydrocarbon vapor is permeated by a suction with the vacuum pump 8 of the first stage, furthermore the hydrocarbon vapor is permeated also through the gas separating membrane 5 of a second stage, hence a low concn. hydrocarbon vapor containing gas is diffused. The hydrocarbon containing gas permeated through the gas separating membrane 4 is pressurized and transmitted to the recovery column 9, and is brought into contact with the gasoline liquid 10 and absorbed, the gas not absorbed is returned as the return gas 14 along with the hydrocarbon vapor 12 permeated through the gas separating membrane 5.</p> |
