How to simulate the whole process of catalytic degradation of poly ethylene and polypropylene in order to obtain the liquid oil product . the whole process including (plastic waste feeder feeder- fluidized bed reactor - catalyst feeder - condenser) knowing that 1. Catalyst loading:catalyst loadings in the range of 1-10 wt% are used. 2. Temperature: The temperature range between 400-600 C. 3. Pressure: in the range of atmospheric pressure. 4. Feedstock composition: (a mixture of 70% polyethylene and 30% polypropylene). 5. Product selectivity: The selectivity of the productsliquid product