In February 12, our company received the two utility model patent certificates of "energy-saving air separation nitrogen precooling system" and "energy-saving oxygen generator" authorized by the State Intellectual Property Office. These two patents are declared by Xu Hao, the chief engineer of our company. The two patents broke the technology monopoly of foreign companies in this field, optimized the product structure and reduced the investment of engineering projects. The two patent projects are in line with the national general trend of energy conservation and consumption reduction, and the development of circular economy, which is another highlight of DEAR space separation. The successful authorization and application of these two patents indicate that the development of energy-saving air separation technology of our company has stepped into the substantive use stage from the research stage, it will provide strong support for the whole industry of comprehensive utilization of energy-saving air separation equipment.