Abstract
Propylene yield is one of the key operating parameters that is monitored daily in the running olefin plant. This study was conducted in the actual world-scale olefin plant to measure the impact of identified controlled variables on the propylene yield. The Box-Cox data transformation was adopted in the Regression Analysis using Minitab Software Version 18 due to non-normal data were observed after normality and stability test were conducted using Box Plot, I-MR Chart, Run Chart, Graphical Summary, and Normality Plot tools. The model concluded that propylene yield in the studied plant was contributed by the factors of -0.000243 Hearth Burner Flow, 0.01332 Integral Burner Flow, and 0.08598 Naphtha Feed Flow. The Response Optimizer tool also suggested that the propylene yield from naphtha liquid feed can be maximized at 11.22% with the control setting at 10,993.86 kg/hr of Hearth Burner Flow, 604.61 kg/hr of Integral Burner Flow, and 63.50 t/hr of Naphtha Feed Flow.
Highlights
Propylene yield monitoring is essential in the steam cracker furnace as its value translates to the profit generation and sustainability of the olefin plant
Variance Inflation Factor (VIF) value is recommended to be
The Regression analysis utilizing Minitab Software was conducted a few times until all VIFs and P-Values reading were satisfactory to develop the reliable mathematical model for Propylene Yield in the studied plant
Summary
Propylene yield monitoring is essential in the steam cracker furnace as its value translates to the profit generation and sustainability of the olefin plant. The plant was designed to produce 645 KTA capacity of polymer grade propylene product from naphtha feed via pyrolysis cracking in the steam cracker furnace. Pyrolysis cracking was primarily developed in the early 1920s with a focus to enhance the quality and quantity of gasoline components for the refinery [5] and the technology was continuously developed for olefin production. It is the heart of the olefin process where the main reaction in the olefin plant occurs via pyrolysis cracking in the steam cracker furnace
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