Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第12卷    第5期    总第50期    2002年10月

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文章编号:1004-0609(2002)05-1065-04
焙烧HDS失活催化剂提取钒的动力学
刘公召1, 2, 隋智通1

(1.东北大学 材料与冶金学院, 沈阳 110006;
 2.沈阳化工学院 化工系, 沈阳 110021
)

摘 要: 在固定床反应器中,用空气焙烧HDS失活催化剂,再用碳酸钠水溶液浸取钒和钼。研究了钒焙烧转化率随失活催化剂粒径、焙烧温度及焙烧时间的变化关系,结果表明:实验数据可以用收缩未反应核模型拟合。当催化剂平均粒径小于60μm,或在较低反应温度及较低转化率下,内扩散阻力可以忽略不计,过程受化学反应控制;而当平均粒径大于60μm,且在较高反应温度及较高转化率下,过程同时受化学动力学与内扩散控制。分别导出了2种情况下焙烧钒的动力学方程式,并按方程式计算得到反应温度在923~1123K时的活化能为56.12kJ·mol-1

 

关键字: HDS失活催化剂; 焙烧; 钒; 动力学

Kinetics of roasting HDS spent catalyst for recovery vanadium
LIU Gong-zhao, SUI Zhi-tong

School of Materials and Metallurgy, Northeastern University, Shengyang 110006, China

Abstract:Vanadium can be recovered from spent HDS catalyst by roasting it with air in a fixed bed reactor and then immersing roast product with sodium carbonate solution. The relationship between vanadium recovery and catalyst diameter, roasting temperature and roasting time is investigated. The experiment results indicate that the roasting reaction kinetics can be expressed by the shrinking core model. When catalyst particle diameter is <60μm, the roasting process is judged as reaction controlled step . At the conditions of diameter >60μm,high roasting temperature and large vanadium recovery, the process rate is controlled by reaction and inner-diffusion simultaneously. The kinetics equations for two different controlled steps are found . The activation energy within 923~1123K is 56.12kJ·mol-1

 

Key words: HDS spent catalyst; roast; vanadium; reaction dynamics

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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