| 摘要 |
<p>A cyclic process for obtaining nitrogen rich product gas from a feed gas containing oxygen and nitrogen, utilising similar first and second vessels connected in parallel between a feed gas supply line and a product gas delivery line and each containing carbon molecular sieve capable of separating nitrogen and oxygen molecules, in which, during a first phase of each cycle: (a) feed gas is supplied at a controlled rate and pressure to the first vessel and product gas is delivered from the first vessel to the delivery line, (b) a portion of the product gas is passed as purge gas at reduced pressure to the second vessel, (c) the second vessel is vented to exhaust during a first period of the first phase and the exhaust is closed during a second period of the first phase; and during a second phase of each cycle (d) feed gas is supplied at a controlled rate and pressure to the second vessel and product gas is delivered from the second vessel to the delivery line, (e) a portion of the product gas is passed as purge gas at reduced pressure to the first vessel, (f) the first vessel is vented to exhaust during a first period of the second phase and the exhaust is closed during a second period of the second phase; and during the whole of the cycle, the only connection made between the vessels is that for the purge gas. <IMAGE></p> |
