A system of seven neon diffusion tower units in four cascades. The first cascade consists of 2 towers in parallel and the remaining four cascades consist of 1 tower each. Tower height is 6m, tower cold wall diameter were 13.5, 13.9, 14.5, 17.2, 18.6, 19.4mm, the center of the tower has a diameter of 1mm nickel-chromium wire, tower and tower between the cold, hot return pipe connection, the return pipe diameter of 5mm, the heating wire, the temperature is 600 , the diffusion of the pressure in the tower is 50mm Hg, the temperature in the hot return tube is 100 The temperature of the cooling water was 25C. The Ne feed gas with an abundance of 9.22% was passed into the diffusion tower, and after 5 days, the abundance of 22Ne could reach 60%. If the discharge abundance is 60% of 22Ne gas, 600 ml per day can be produced, if the discharge abundance is 50% of 22Ne gas, 800 ml per day can be produced, if the discharge abundance is 40% of 22Ne gas, 1000 ml per day can be produced. The purity of the product gas can reach 99%.
