Propylene yield from naphtha pyrolysis cracking using surface response analysis

The study was conducted in the actual world-scale olefin plant with a focus on measuring the impact of identified controlled variables at the steam cracker furnace towards the propylene yield. Surface response analysis was conducted in the Minitab software version ۲۰ using the historical data after the clearance of both the outliers and residuals to ensure the analysis was conducted as normal data. Surface response analysis is a robust mathematical and statistical approach that is having a good potential to be systematically utilized in the actual large-scale olefin plant as an alternative to the expensive olefin simulation software for process monitoring. The analysis was conducted to forecast the maximum propylene yield in the studied plant with careful consideration to select only significant variables, represented by a variance inflation factor (VIF) <۱۰ and p-value <۰.۰۵ in the analysis of variance (ANOVA) table. The final model successfully concluded that propylene yield in the studied plant was contributed by the factors of ۰.۰۰۴۹۶, ۰.۰۰۲۰۴, and -۳.۹۶ of hearth burner flow, dilution steam flow, and naphtha feed flow respectively. The response optimizer also suggested that the propylene yield from naphtha pyrolysis cracking in the studied plant could be maximized at ۱۱.۴۷% with the control setting at ۱۰,۰۰۴.۳۶ kg/hr of hearth burner flow, ۴۰,۹۶۰ kg/hr of dilution steam flow, and ۶۳.۵۰ t/hr of naphtha feed flow.

کلیدواژه ها:

Response surface methodology ، Olefin Process ، statistical analysis ، minitab ، ANOVA