Design of A Plant to Produce 5 Ton per Day Liquid Fuel from Waste Plastic (Low Density Polyethylene)

The present work involves the study and design for the production of liquid fuel from waste plastic (LDPE) by thermal pyrolysis. The process is carried out thermal pyrolysis where degradation of larger molecules into smaller molecules. The effect of temperature has been studied at different temperatures 475°c, 500°c, 525°c, 550°c and the following wt. % are 47.3%, 63.2%, 69.8%, 77.07% respectively. The most economical process flow diagram was designed for production of liquid fuel from waste plastic (LDPE). The maximum yield of product is obtained at optimum temperature 550°c. With the help of product flow rate, the required raw materials are calculated which are 6.48 tons per day to produce 5 ton per day liquid fuel. Residence time is the time required for reaction and this noted as 57 min from the experiment. Design of the reactor is done with help of residence time and flow rate of raw materials and calculated to be 544 liters. Designing of equipment (vessel) are done with the help of mass balance and heat balances reactions. Volume of the vessel is found out from the steady state heat conduction equations. The optimum diameter and length of the reactor are calculated. Cost estimation of the plant is calculated and it is found that it is feasible to put a plant of 5tons of liquid fuel and with help of input cost and output cost and then profitability is calculate