The Art of Evaluating Laboratory Fixed Bed Catalytic Cracking Data

2Figure 4Effect of Conversion on Propane Yields - ACE Data1.8Catalyst C1.61.4Catalyst BCatalyst APropane Yield, wt%1.210.80.6Catalyst CCatalyst ACatalyst B0.40.200 0.5 1 1.5 2 2.5 3 3.5 4 4.52nd Order ConversionLPG Olefins – Propylene and ButylenesIn correlating the LPG olefins, zero yield at zero conversion again provides a fixed data pointwhich helps define the relationship. The use of 2 nd order conversion helps to compress the conversionscale at the low conversion range so that the zero point can be a useful anchor. However, 2 nd orderconversion no longer provides a linear relationship, as it did with propane and n-butane, since theolefinic products participate in secondary reactions and thus tend to go through a maximum at highconversion. The data are now nicely represented by a 2 nd order polynomial. This type of least squareFigure 5Effect of Conversion on Propylene Yields - ACE Data1210Catalysts B & CPropylene Yield, wt%864Catalyst AC atalyst CC atalyst AC atalyst B200 0.5 1 1.5 2 2.5 3 3.5 4 4.52nd Order Conversion