高含有机硫炼油废碱液的治理研究

提出的废碱液酸化O空气汽提治理工艺流程,将部分硫磺回收装置用压缩空气(9. 5 %) 引入废碱液汽提塔,作为汽提空气,汽提出来的H2S、RSH 又随空气去回收硫磺,不仅解决了装置汽提能耗,而且完全回收了硫资源,消除了高含有机硫炼油废碱液对环境的污染。对我国炼油厂加工中东高含硫原油,治理含硫废碱液具有重要意义。最佳试验条件为:98 %硫酸用量84 ml/ L ,酸化pH = 4. 5～5. 5 ,汽提温度90 ℃,汽提时间2. 5 h。汽提处理后废碱液用于生产硫酸钠或去工程车间稀释排放,排放水总硫< 1 mg/ L 、pH = 7 ,达到GB8987 - 1996 一级排放标准。

ONE APPROACH OF HARNESSING REFINING WASTE ALKALI LIGUOR CONTAININGORGANIC SULFIDES

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 airstripping 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 conditionsare 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.