Abstract: The process of acidization of waste alkali liquor and airstrip has been put forward in this paper. Part of compressed air (9. 5 %) used by recovery apparatus is taken into the stripping tower of waste alkali liquor as stripping air and the stripped H2S、RHS go along with air to recover sulfur in the recovering sulfur tower ,which not only saves the energy consumption of air
stripping apparatus , but also fully recovers resources of sulfur and decreases environmental pollution caused by waste alkali containing organic sulfides in oil refining. This approach is of great significance for our refinery in processing the Middle East crude oil with high content of sulfur and harnessing waste alkali liguor containing sulfur. The optimum experimental conditions
are as follows : vitriol (98 %) 84 ml/ L , pH = 4. 5～5. 5 , stripping temperature 90 ℃, stripping time 2. 5h. After the airstrip ,the waste alkali liguor can be used to produce sodium sulfate or be directly discharged after dilution in engineering workshop. The total content of sulfur in discharge water is < 1 mg/ L 、pH = 7 , which reaches the first degree of GB8987 - 1996.

Key words: waste alkali liquor containing organic sulfides, acidizationOairstrip method, comprehensive utilization, process, environment protection