Optimal control of mixed refrigerant composition at Sakhalin LNG plant

A technique for the optimization of mixed refrigerant (MR) composition was developed and successfully applied at the Sakhalin LNG plant on Sakhalin Island, Russia. Indirect control of the MR composition was implemented via calculated inventories, replacing direct control of component concentrations and maximizing the LNG plant’s performance. Introduction. The MR cycle is used for liquefaction and subcooling of natural gas in most large LNG trains based on technologies such as AP-C3MR, AP-X and Shell DMR. The varying composition of MR cycle technology is its major advantage over the Cascade process. This advantage comes from the fact that MR composition can be adjusted to fit the natural gas