The localization of large air separation unit can not only save the investment cost of the project, but also can not be restricted by foreign investors in the after-sales maintenance service, and can ensure the stable and safe operation of the air separation project. Distillation column is one of the main core units of air separation unit. Because the diameter of distillation column supporting large coal chemical air separation unit is up to and limited by transportation, high-throughput tray and packing are needed. This problem is also one of the important issues of large air separation unit localization.
