裂解汽油二段加氢催化剂LY-9802的抗CO性能及工业应用

CO resistance performance and industrial application of second-stage pyrolysis gasoline hydrogenation catalyst LY-9802

针对某裂解汽油加氢装置氢气中CO体积分数(1000×10^(-6)以上)较高的情况,分析了CO对裂解汽油二段加氢催化剂LY-9802加氢性能的影响,考察了催化剂LY-9802的工业应用效果。结果表明:催化剂LY-9802能使氢气中的CO部分加氢生成CH_(4),随着反应温度升高,CO转化率和CH_(4)生成率均提高,但CO转化率不超过60%;在氢气中CO体积分数为1400×10^(-6),反应器入口温度为245~260℃的小试加氢反应条件下,产物溴价为0.005~0.008 g/g,含硫量为0.5~0.8μg/g,当入口温度分别为265,275℃时,产物溴价分别小于0.005,0.001 g/g,含硫量分别小于0.5,0.1μg/g,提高入口温度能有效恢复并提升催化剂活性;在加氢反应器二段入口温度为280~320℃的工业生产条件下,床层温升在40~60℃波动,加氢产品溴价不大于0.001 g/g,含硫量不大于0.5μg/g。

The effect of CO resistance performance on the second-stage hydrogenation catalyst LY-9802 of pyrolysis gasoline was studied in view of the high CO volume fraction of hydrogen(more than 1000×10^(-6))in some pyrolysis gasoline hydrogenation units.And the industral application of catalyst LY-9802 was investigated.The results showed that CH_(4) was produced from CO on the second stage hydrogenation catalyst.As the reaction temperature increased,both CO conversion rate and CH_(4) generation rate increased,but the CO conversion rate did not exceed 60%.Under the small-scale hydrogenation reaction conditions with CO volume fraction of 1400×10^(-6)and inlet temperature of 245-260℃,the bromine value of the product was 0.005-0.008 g/g,and the sulfur content was 0.5-0.8μg/g.When the inlet temperature was 265 and 275℃,the bromine value of the product was less than 0.005 and 0.001 g/g,and the sulfur content was less than 0.5,0.1μg/g,respectively.Increasing the inlet temperature could effectively recover and enhance the catalyst activity.The industrial operation results showed that at the reactor inlet temperature 280-320℃,and temperature rise of the bed between 40-60℃,the bromine value of hydrogenation product was less than 0.001 g/g and the sulfur content was less than 0.5μg/g,which all met the index requirements.