Abstract: The cryogenic methanation technology was studied to replace the commonly used PSA technology to refine hydrogen for polypropylene raw material, and the technical scheme was designed and put forward. BC-H-10 catalyst was used to remove CO from refinery industrial hydrogen to provide raw material for polypropylene by cryogenic methanation technology with low-temperature heat source in refinery. The results show that the CO impurity content in industrial hydrogen can be reduced to less than 0.1 μL/L steadily at the conditions of reaction pressure of 1.8 MPa, temperature of 150-155 ℃ and catalyst loading of 0.1 m³. The scale of cryogenic methanation is 300 m³/h, and the hydrogen yield is 99%, which is higher than the original PSA process. The cryogenic methanation technology can save investment and land occupation, reduce operation cost and increase efficiency by 3.5 million yuan per year.

Key words: refinery, polypropylene, material, hydrogen, cryogenic methanation