六西格玛方法在Pt/SAPO-11加氢异构催化剂评价反应中的应用

Application of 6-Sigma methodology in the evaluation of Pt/SAPO-11 hydroisomerization catalyst

以Pt/SAPO-11为催化剂、正十六烷为模型化合物,进行加氢异构性能反应评价。采用六西格玛设计中的实验设计(DOE)及分析方法拟合并研究各评价参数(反应温度、氢气分压、氢气流速和进料速率)对催化性能的影响及交互作用关系。结果表明,升高反应温度对正十六烷的转化有利,增加氢气分压和进料速率均抑制正十六烷的转化,达到相同转化率需要更高的反应温度,而异构十六烷选择性随温度升高呈现降低趋势;氢气流速的变化对正十六烷转化率和异构十六烷选择性影响较小。拟合结果显示,各评价条件对转化率和异构选择性的影响关系类似,反应温度、氢气分压和氢气流速各自为线性关系,但进料速率与反应温度和氢气分压分别有交互作用,且自身存在二次影响关系,因此,进料速率对评价结果呈曲率影响关系。

Using Pt/SAPO-11 as the catalyst and n-hexadecane as the model reactant, the hydroisomerization performance evaluation of the catalyst was carried out. The design of experiment （DOE） approach of 6-Sigma methodology was adopted to research the influence of the test conditions （reaction temperature, H2 pressure, H2 flow rate and feed flow rate） on catalytic performance and their interaction. The results indicated that high temperature was helpful to the conversion of n-hexadecane ;increasing I-I2 pressure and feed flow rate were harmful to the conversion of n-hexadecane, so the higher temperature should be chosen to reach the same n-hexadecane conversion; the selectivity to i-hexadecane was decreased with the increase of the temperature. Hydrogen flow rate was not significant factor in the test. The fitting results showed that all the test conditions had the same influence relationship to both of the conversion and selectivity. The influence of reaction temperature, H2 pressure and hydrogen flow rate were linear, but feed flow rate had not only quadratic influence but also the interaction with temperature and H2 pressure respectively,therefore ,there existed the curvature influence relationship between feed flow rate and the evaluation results.