the FR, is H2-rich syngas in SYNGAS stream. The solid from FR (FEOCACO3) is fed to the SR which the steam-iron reaction is take places to generate the high purity H2 stream (H2). The water for feed to the SR (WATER-SR) is heated by HEATER3 from 25 oC to 400 oC. After the Fe0.947O react with the stream, the Fe0.947O is transformed to Fe3O4. Then, the mixture of gaseous and solid from SR (SR-CYC) is fed to the CYC2 for separating gas and solid. The solid from SR (CACO3FE3) is fed to the CAL which the calcination is take places to regenerate CaO. Then, the mixture of CO2 gas and solid from CAL (CAL-CYC) is fed to the CYC3 for separating gas and solid. The main gaseous product from the CAL is CO2 (CO2). Then, the solid stream from CAL (SOLID-RE) is feedback to the FR for complete process loop. This process is operated under isothermal and isobaric condition. The pressure of all process streams and all reactor is 1 atm.