失活渣油加氢脱金属催化剂再利用及钒回收技术研究

Study on reuse of deactivated residue hydrodemetallization catalyst and vanadium recovery technology

以失活渣油加氢脱金属催化剂及碳酸氢铵为原料,采用水热处理技术对失活渣油加氢脱金属催化剂进行处理,考察了碳酸氢铵加入量、处理温度、处理时间对钒回收率及催化剂孔道结构的影响,研究了处理后催化剂的丙烷脱氢制丙烯活性。实验结果表明,应用碳酸氢铵溶液对失活渣油加氢脱金属催化剂水热处理,可有效回收催化剂中的钒,钒回收率可达75%,处理后催化剂的比表面积可达135 m^(2)/g,孔体积可达0.29 mL/g。最佳处理条件为:碳酸氢铵与失活催化剂的质量比4∶1、处理温度140℃、处理时间6 h,处理后催化剂的丙烷脱氢转化率约为6%,选择性为93%。

Using the deactivated residue hydrodemetallization catalyst and ammonium bicarbonate as raw material,the deactivated residue hydrodemetallization catalyst was treated by hydrothermal treatment technology.The effects of ammonium bicarbonate amount,treatment temperature,and treatment time on the vanadium recovery rate and the pore structure of the catalyst were investigated,and the activity of the treated catalyst for dehydrogenation of propane to propylene was explored.The experimental results show that the vanadium in the catalyst can be effectively recovered by hydrothermal treatment of the deactivated residue catalyst with ammonium bicarbonate solution.The recovery rate of vanadium can reach 75%,the specific surface area of the treated catalyst can reach 135 m^(2)/g,and the pore volume can reach 0.29 mL/g.The optimum treatment conditions are as follows:the mass ratio of ammonium bicarbonate and deactivated catalyst 4∶1,the treatment temperature 140℃,the treatment time 6 h.The conversion of propane dehydrogenation on the treated catalyst is 6%,and the selectivity is 93%.