| 摘要 |
PCT No. PCT/RU95/00143 Sec. 371 Date Dec. 24, 1997 Sec. 102(e) Date Dec. 24, 1997 PCT Filed Jul. 3, 1995A method for gas mixture demethanization is suitable for decreasing the loss of the target product (ethylene) and power requirements for gas mixture demethanization process. The gas mixture demethanization method consists in the progressive cooling of the initial gas mixture via the external and internal cycles with the formation of the intermediate partial condensates of the mixture components, rectification of these condensates with the production of a demethanized liquid phase and a gaseous methane fraction, cooling the latter via the external cycle with the formation of a partial condensate, separation and utilization of this condensate as the coolant for the said cycle by throttling the condensate, its evaporation with the mixture under cooling and recirculation into the initial gas mixture, the methane phase, before being cooled via the external cycle and prior to being separated, being additionally cooled via the internal cycle along with its use for cooling the initial gas mixture, the internal cycle coolant being supercooled prior to throttling by its participation in the heat-exchange process with the intermediate partial condensate of the initial gas mixture, generated as a result of its cooling via the internal cycle. Moreover, along with the additional cooling of the methane fraction, the stripped vapors from the lower section of the rectification tower are also cooled prior to their being fed to its upper section.
|
