Analysis Methodology of C4 olefins by ethanol coupling based on correlation analysis

Abstract

C4 olefins are widely used to produce various chemical products and pharmaceuticals. Besides, Ethanol is a good raw material for the production of C4 olefins instead of petroleum cracking and ethylene cracking. First, the optimal choice of catalyst combination and temperature for C4 olefins preparation has been studied, and the process conditions forC4 olefins preparation by catalytic coupling of Ethanol are of great significance and value for promoting industrial production. Besides, a simple scoring method is also proposed to evaluate the differences in the catalytic effects of different experimental groups. We first analyzed the correlation with the R language and found that the temperature was positively correlated with the C4 olefin selectivity and ethanol conversion rate. Then, we fitted 21 curves sets of ethanol conversion rate and C4 olefin selectivity with temperature. Second, R language is used to perform correlation analysis to screen out variables that are significantly related to ethanol conversion and C4 olefin selectivity, then obtain a stepwise regression equation to quantitatively describe the effects of different catalyst combinations and temperatures on ethanol conversion and C4 olefin selectivity. Thirdly, we used the stepwise regression method to obtain the optimal local solution at each temperature, and the optimal combination of temperature and catalyst was 0.5wt% Co loading at 400℃, 200mgCo/SiO2-200mgHAP, ethanol concentration is 0.3ml/min. If the temperature is required to be controlled below 350 degrees, the optimal combination of temperature and catalyst is 2.145wt% of Co loading, 200mgCo/SiO2-200mgHAP, and ethanol concentration of 2.1ml/min at 350℃.