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Distinguish between Thermal & Catalytic cracking
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Sr. no Thermal cracking Catalytic cracking
1 No catalyst is used Catalyst is used zeolite bauxite or bentonite can be used as a catalyst
2 Higher temperature and pressure is used Liquid phase, T = 420 – 5500 C,P = 15 – 100 kg / cm2,Vapour phase, T,= 600- 6500,P = 15 – 20 kg/cm2 Comparatively lower temperature and pressure is used Fixed bed, T = 425 – 5400 C,P = 1.5 kg / cm2,Moving bed, T= 550 – 5700 C,P = 1 kg / cm2
3 Yield of gasoline is 50-60 % Yield of gasoline is more than 70 %
4 Octane rating is 70 Octane rating is 80-85
5 Cracked vapours contains lesser percentage of aromatic iso paraffins and less of gum forming diolifines Cracked vapours contains greater percentage of aromatic iso paraffins and less of gum forming diolifines
6 Time required is comparatively more Time required is comparatively less
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