| abstract |
The purpose of the present invention is: to improve the energy utilization efficiency in a gas separation device for separating carbon dioxide and steam from a first mixed gas comprising a specific main component gas, carbon dioxide and steam; and to provide a membrane reactor and a hydrogen production device each having a high energy utilization efficiency, each of which is produced utilizing the function of the gas separation device. The gas separation device comprises a first separation membrane (33) and a second separation membrane (34) which are made from different materials. When the first mixed gas is supplied to the first separation membrane (33) at a temperature of 100°C or higher, carbon dioxide and steam are passed through the first separation membrane (33) selectively, thereby separating a second mixed gas comprising carbon dioxide and steam that have been passed through the first separation membrane. When the second mixed gas is supplied to the second separation membrane (34), steam is passed through the second separation membrane (34) selectively, thereby separating steam that has passed through the second separation membrane (34). |