Dabaodang Town is located in the southwest of Shenmu City, Shaanxi Province. There are huge treasures underground, containing coal and natural gas resources. Under the strategic plan of the country's western development. Shenhua, Shaanxi Coal Chemical, Yanchang and other coal chemical projects with a scale of 100 billion are under construction here, becoming the world's largest coal chemical base. Including Shaanxi Coal Group's Yulin Chemical Coal Separated Utilization of New Chemical Materials Demonstration Project. Linde Engineering provided the design, manufacture, supply and service of three ultra-large air separation plants for the project. After the device is completed, it will provide high-pressure oxygen for the coal-to-glycol gas chemical section, as well as low-pressure oxygen and medium/low-pressure nitrogen required by other sections, and at the same time supplement instrument air, factory air and other products for the public engineering system of the plant.