关键词: 汽提净化水, 氨氮, 硫化物, 挥发酚, 碘量法

Abstract:

In view of the fact that the concentration of ammonia nitrogen and sulfide in purified water of a refinery stripping unit has not reached the design index, a comprehensive analysis, process optimization and experimental research were carried out. The results showed that the poor water quality of non-hydrogenated acid water was the main reason that affected the stripping efficiency. By reducing the total oil and volatile phenol content of stripping feed water and improving the steam quality of stripping tower, the purified water quality had been obviously improved, but the mass concentration of sulfide was still more than the design index of 20 mg/L. It was found that volatile phenol and alkalinity tended to make the measurement result larger when determining sulfide by iodometry, while the real value of this purified water was lower than the design index. In order to reduce the interference of volatile phenol and measurement error, it was suggested to adopt the pretreatment methods of fixation, separation and acidification air blowing when determining sulfide by iodometry.

Key words: stripping purified water, ammonia nitrogen, sulfide, volatile phenol, iodometric method