| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently operate a PSA process, to enhance the throughput and recovery rate while restraining a raise in cost and to conduit efficient and safe operation. SOLUTION: When an inflammable component comprising hydrocarbons and/or H2 is recovered from a gaseous starting material mainly comprising the inflammable component and a noninflammable component comprising CO2 and/or N2, at least three adsorption towers and an adsorbent having pore size between molecular diameters of the inflammable component and the noninflammable component are used so that a cycle comprising an adsorption step, a pressure-reducing step, a desorption step and a pressurizing step is carried out at each adsorption tower while postponing the cycle time. It is preferable that the exhaust gas at the pressure-reducing step is supplied to the adsorption step as a recycle gas together with the gaseous starting material and that the desorption step is carried out after carrying out a washing step using the gas exhausted at the desorption step as a washing gas after the pressure-reducing step is ended. It is also preferable that a pressure-equalizing step is carried out by connecting the tower where the adsorption step is ended to the tower where the desorption step is ended. According to this method, a high calorie town gas can be steadily supplied from a coke furnace gas, etc.</p> |
