1. Gas Refining Technology Group, Gas Research Division, Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-137 Tehran, Iran
2. Natural Gas Sweetening Group, Gas Processing Institute (GPI), 1485733111 Tehran, Iran
3. Petrochemical and Polymeric Research Division, Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-137 Tehran, Iran