Qingyang Petrochemical Company has a total refining processing capacity of 3.7 million tons/year, with 1.85 million tons/ year catalytic cracking unit.The 350000 tons/year liquefied gas refining unit was completed on Oct. 1, 2010 and started up successfully at one time,in which the amine liquefied gas desulfurization system and the alkali liquefied gas desulfurization system were running normally.However, the problem is that the unit consumption of lye is too high and the production of alkali slag is large,which leads to the high processing cost of the unit.In order to reduce the processing cost, the alkali regeneration system was started later, but after nearly 3 months of trial operation, the alkali regeneration effect was poor, and the problem of high alkali slag consumption per unit alkali solution could not be solved effectively.It is considered that the root cause is that the process design of lye regeneration system is backward.In order to effectively solve the bottleneck effect of high alkali slag consumption, it was decided to use the liquefied gas deep desulphurization technology developed by the China Institute of Petroleum and Chemical Engineering (LDS),to carry out lye regeneration by using hypergravity technology.The revamping of the lye regeneration system in the plant was completed on November 20, 2014.The operation of the plant has been stable so far, which effectively solves the bottleneck problem of high alkali slag consumption per unit consumption of lye.The total cost savings for the whole year are about 3.1632 million yuan per year.The industrial application effect of liquefied gas deep desulfurization technology (LDS) is good. Compared with the traditional process, the innovation point is higher, the amount of alkali slag consumed by lye is greatly reduced, and the economic benefit is remarkable.