Shaanxi Company completed the transformation project of four sets of molecular screening system of the air separation device during the maintenance. On the premise of not changing the original design size, this transformation cancels the inert alumina in the purifier, the loading amount of activated alumina is increased, the new molecular sieve adsorbent is replaced, and the adsorption cycle of molecular sieve is extended from 4 hours to 6 hours, which is the first time in the same industry in China. At present, all the operating indexes meet the design requirements. It can save 10,000 tons of steam and reduce the cost of 850,000 yuan. (Shaanxi Company)