LPG铜片腐蚀原因分析及解决方案研究

实验对温米采油厂提供的液化石油气（LPG）样品进行定性、定量检测，确定引起LPG铜片腐蚀不合格的原因是H。S含量超标，样品LPG的硫含量为2．55μg／g。采用干法加速评价法来脱除LPG中的H2S。从常用的脱硫剂中评选出CNDS-1为最优脱硫剂，其最佳脱硫操作条件为吸附温度20℃～40℃，空速0．8h－1～1．5h－1。在最佳条件下，可将LPG中的H2S含量从302．40μg／g降到0．30μg／g以下，LPG铜片腐蚀实验合格，CNDS--1对H2S的吸附硫容量为8．20％（w）。根据对CNDS-1脱硫效果的实验研究，提出了固定床干法脱硫的原则工艺流程。该脱硫工艺流程简单，投资和操作费用低，无新增能耗，可以满足LPG产品铜片腐蚀合格的要求。

Causes Analysis and Solution Research on Copper Corrosion of LPG

The liquefied petroleum gas samples provided by Wenmi Oil Extraction Plant are analyzed qualitatively and quantitatively.The result shows that it is the excessive level of H2S content which causes the failure of LPG copper corrosion,and H2S content of the samples is 2.55 μg/g.In this study,H2S is removed by accelerated evaluation of solid adsorption.CNDS-1 is selected from the common used desulfurization agents as the optimal sorbent.The optimal operation conditions of CNDS-1 are: adsorption temperature is 20℃-40℃,space velocity is 0.8 h-1-1.5 h-1.Under optimal conditions,H2S content can be reduced from 302.4 μg/g to 0.3 μg/g below,LPG copper corrosion test is qualified and sulfur adsorption capacity of CNDS-1 is 8.2%(wt).According to the desulfurization experimental study,the principle process flow is put forward.The desulfurization process is simple,the investment and operation cost is low,and no additional energy loss,which can be qualified to meet the requirements of copper corrosion.