液化石油气中硫醇的低温等离子体脱除研究  

Study on Removal of Mercaptan from LPG by Cryogenic Plasma

作　　者：张帆[1] 何伟杰[1] 梅华[1] 周文[2] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009 [2]北京防化研究院,北京102205

出　　处：《石油化工腐蚀与防护》2008年第3期7-10,共4页Corrosion & Protection In Petrochemical Industry

摘　　要：采用低温等离子体脱除液化石油气中的硫醇,考察了硫醇初始质量分数、停留时间、放电功率等参数对等离子体脱硫的影响。并分析了等离子体对液化气烃类组成的影响。实验结果表明,低温等离子体能很好地脱除液化石油气中的硫醇,随着初始硫醇质量分数的降低、停留时间的增加和放电功率的增加都能提高硫醇的转化率。初始硫醇质量分数为230μg/g的液化石油气经低温等离子体作用后,在放电功率为55 W、停留时间200 s时液化气中丙烯量有最高值、碳四烯烃量有最低值。硫醇脱除机理可以分为2部分:电子直接和硫醇分子碰撞使之转化为无毒无害物质;电场中产生的各活性粒子和自由基团与硫醇分子之间发生的化学反应。Through cryogenic plasma removal of mercaptan from LPG, the parameters, such as initial concentration, residence time, discharge power, etc which influenced the removal rate were investigated. The impact of cryogenic plasma on hydrocarbon components in LPG was analyzed. The results revealed that the mercaptan in LPG could be efficiently removed by cryogenic plasma. The conversion of mercaptan was increased with reduced initial concentration, longer residence time and increased discharge power. After the LPG with initial 230 ppm mercaptan was treated by the cryogenic plasma at the discharge power of 55W for a residence time of 200 seconds, propylene gas volume was the highest and the volume of CA olefins was at minimum point. The removal of mercaptan depends on two mechanisms： collision between electrons and mercaptan molecules and reactions between gas- phase radicals and mercaptan molecules.

关 键 词：低温等离子体 液化石油气 硫醇 脱硫 转化率 

分 类 号：TE624.55[石油与天然气工程—油气加工工程]