| 摘要 |
<p>1,026,265. Cold separation of gas mixtures. LINDE A.G. Aug. 20, 1964 [Aug. 21, 1963], No. 34006/64. Heading F4P. Each of at least three cyclically interchangeable regenerators undergoes a warm period during which compressed gas passing therethrough is cooled, a subsequent cold period during which cold gas at a lower pressure passing therethrough is warmed and an additional period immediately following the warm period and during which residual compressed gas is withdrawn through either the cold or warm end and used usefully. As shown, compressed coke oven gas from a supply line 5, Fig. 1(a) (not shown), is cooled in a regenerator 1, thereby depositing condensible constituents including ethylene and the so purified coke oven gas at a lower pressure is passed through regenerator 4 undergoing the cold period and through a discharge line 7. Residual gas in regenerator 2 which in the previous period was being warmed by passage of coke oven gas is withdrawn through lines 10, 20 and 11 including a regulating valve 18 and a check valve 19 and passed through a regenerator 3 to free it from deposited impurities and which latter are forced by a vacuum pump 8 into a crude ethylene container 9. The cold requirements of the system are met by refrigeration coils 21. After the first changeover regenerator 4 undergoes the warm period, regenerator 1 the additional period, regenerator 2 the rinsing period and regenerator 3 the cold period after three such changes the cycle recommences. In a modification, residual coke oven gas withdrawn during the additional period is added to purified gas being passed to the regenerator undergoing the cold period. In a further modification, residual gas is withdrawn from the warm end of the regenerator and is compressed and added to the crude gas feed to the regenerator in the warm period. In a further modification, the additional and rinsing periods are combined. In a still further embodiment included in a conventional twostage air rectification plant the residual compressed air is withdrawn from the cold end of the regenerator during the whole of the additional period thereof and is expanded through a throttle valve into the low pressure column at a uniform flow rate.</p> |
