Calorific value pyrolysis oils

The calorific value of fhe plastics pyrolysis oils was befween 33.6 and 53.4 MJ kg depending on fhe composition of fhe original plastic polymer. The calorific value was high aparf from fhe oil derived from fhe polyesfer/sfyrene copolymer resin used in the manufacture of composite. This was attributable to the high oxygen content of the original... 

An oil of low flash point in the range 14-18°C, and of 41-43 MJ Kg gross calorific value has been obtained in batch pyrolysis [36] of automobile tyre waste. In a pilot plant with semi-continuous feeding [37] the liquid yield of tyre waste decreased seriously with increasing temperature, and it was always lower in an atmosphere containing oxygen that in nitrogen. 

Pyrolysis can be performed for many different reactors. The prodnct distribntion varies markedly between the different reactor types and the reaction conditions, snch as temper-atnre, bed materials or catalyst. The aim of the pyrolysis is the redaction of wastes for landfilling and the prodnction of fnels. Especially fuel oil with a high calorific value is an interesting product. Char can be used as a fuel, but is also seen as a precursor for other carboneous materials such as activated carbon. The best way to obtain these products is decarboxylation of the polymer. In this way carbon oxide-rich gas is produced. 

Pyrolysis of Pulp and Paper Sludge. The filter cake containing about 80% moisture was supplied for the cracking reactor without predrying. Heavy oil was fed to the incinerator as the auxiliary fuel. This is different from the case of municipal refuse, but the combustible gas composition and calorific value, flue gas composition and ash were similar to that of municipal refuse. The chemical analysis of combustible gas and flue gas are shown in Tables IX and X. 

Gas. Gas has a high calorific value of more than 1+2,000 KJ/ NM. It is used as fuel for heating the pyrolysis kiln along with the recovered light oil. 

Usually, Polyolefin s thermal cracking at high temperatures (700 °C) produces an olefin mixture of C1-C4 gases and aromatic compounds (benzene, toluene, and xylene). Pyrolysis of polyolefins at low temperatures (400-500 °C) yields high calorific value gases, condensable hydrocarbon oils, and waxes [46]. 

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