Since the production cost of biodiesel is now the main hurdle limiting their applicability in some areas

catalytic cracking reactions represent an alternative route to utilization of vegetable oils and animal fats. Hence

catalytic transformation of oils and fats was carried out in a laboratory-scale two-stage riser fluid catalytic cracking (TSRFCC) unit in this work. The results show that oils and fats can be used as FCC feed singly or co-feeding with vacuum gas oil (VGO)

which can give high yield (by mass)of liquefied petroleum gas (LPG)

C

2

-C

4

olefins

for example 45% LPG

47% C

2

-C

4

olefins

and 77.6% total liquid yield produced with palm oil cracking. Co-feeding with VGO gives a high yield of LPG (39.1%) and propylene (18.1%). And oxygen element content is very low (about 0.5%) in liquid products

hence

oxygen is removed in the form of H

2

O

CO and CO

2

. At the same time

high concentration of aromatics (C

7

-C

9

aromatics predominantly) in the gasoline fraction is obtained after TSRFCC reaction of palm oil

as a result of large amount of hydrogen-transfer

cyclization and aromatization reactions. Additionally

most of properties of produced gasoline and diesel oil fuel meet the requirements of national standards

containing little sulfur. So TSRFCC technology is thought to be an alternative processing technology leading to production of clean fuels and light olefins.