| 摘要 |
<p>PURPOSE:To obtain high gas selectivity, by a method wherein specific gas is absorbed through the gas-liquid contact with an absorbing liquid and the amount of the absorbing liquid is increased in an absorbing tower to remove stock gas and pressure reducing operation is performed in the absorbing tower to separate the specific gas. CONSTITUTION:Stock gas is sent to an absorbing/desorbing tower 1 to absorb and separate CO in the stock gas and the treated gas is taken out from an exhaust gas line 4. Thereafter, a new absorbing liquid is supplied to the absorbing/desorbing tower 1 from an absorbing liquid tank 11 and the stock gas stagnated in the space above the absorbing liquid in the tower 1 is discarded through the exhaust gas line 4. Simultaneously with this operation, a valve 5 is closed and a part of the absorbing liquid in the absorbing/desorbing tower 1 is returned to the absorbing liquid tank 11 using a pump 14 to return the level of the absorbing liquid in the absorbing/desorbing tower 1 to the initial state. Subsequently, the valve 5 is opened and, at the same time, the absorbing/ desorbing tower 1 is evacuated by a pressure reducing pump 6. By this method, CO separated from the absorbing liquid is stored in a storage tank 8 through a product gas line 7.</p> |
