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Advantages And Disadvantages Of Plastics

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Compression ignition engines have been dominating the world ever since Rudolf Diesel introduced it in 1910. Diesel engines became increasingly popular because of their high thermal efficiency, durability and drivability. In spite of these advantages they generate high levels of PM, NOx and Smoke which creates environmental and health issues. Furthermore, due to the high demand and lavish consumption of diesel have led reduction of fossil fuel reserves. So strict emission norms and rapid depletion of petroleum reserves have necessitated the need for an alternate energy source (ref sachin 17-21).
Plastics have become an imperative commodity nowadays. It has become highly popular in short time because of their unmatched usability, flexibility …show more content…
In pyrolysis process the plastic is materials are cracked by heating to lower molecular weight products like liquid or gases, which can be useful as fuels or other energy source (murugan). The basic process of pyrolysis involves the thermal decomposition of long chained hydrocarbon structure into smaller ones at high temperatures (print6 -3). Generally the temperature required are in the range of 500C to 700C and it is hard to maintain such high temperature during the reaction. So in order to carry out the reaction at low temperatures catalysts are used. Calcium Oxide (CaO), Silica (SiO2), Alumina (Al2O3) and Zeolite are the most commonly used catalyst and it helps to reduce the temperature requirement for the completion of reaction (print 6). The waste plastic along with catalyst and coal is fed into the reactor and the temperature is maintained in the range of 300C to 400C. The products of pyrolysis contains liquid fractions (75% to 80%), gaseous fractions (10% to 15%) and remaining solid residues (print 6-4).
Lot of research has been carried out in the area plastic and tyre pyrolysis and their application in heavy engines. Most of the work in utilizing the plastic pyrolysis oil has been done on marine applications where the plastic oil is mixed with heavy oil in order to reduce the viscosity but only a few has been done to anlayse their use in high speed compression ignition engines …show more content…
These plastic chips were then washed to remove impurities and dried in the oven till the moisture content is completely removed. The process was carried out in a cylindrical reaction chamber of 40 cm diameter and 60 cm height. The input feed consists of sized plastic chips, 10% by weight coal and 1% by weight of Silica catalyst. The temperature inside the reactor was maintained in the range of 350C to 400C with the help of temperature controller. The reaction was carried out for 4 hours at atmospheric pressure. Pyrolysis process yielded liquid fractions (80% by weight), solid residue which is coke (15% by weight) and gaseous fractions which is a mixture of propylene, iso butane, ethane and small amounts of methane (5% by weight). The basic composition of plastic pyrolysis oil is given in table 1. All the gaseous products from this process either condensed to liquids and non-condensable products are treated by passing it through water chamber before it is let out. Most of the toxins are either burned out in the absence of oxygen or reduced in the presence of catalyst. The properties of waste plastic oil and diesel is given in table

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