Pyrolysis of coal or any carbonaceous material is a good method for producing valuable products such as gases, liquids and char. It has the advantage, versus other conversion technologies, of promoting the transfer of hydrogen from the parent material to the gas and the liquid products, concentrating the carbon in the residual char which can be an important improvement in the present scenario, in which carbon-free or at least low carbon fuels need to be promoted to reduce CO2 emissions. In this sense, pyrolysis has been claimed as an alternative to incineration or land filling for valorization of wastes of hydrocarbon nature. Yields and composition of each product fraction obtained after pyrolysis depend not only on the reaction conditions but also on the experimental system used for the process. In general, the liquids contain a complex mixture of compounds of 5-20 carbons with a high proportion of aromatics that can be used directly as fuels or as petroleum refinery feedstocks. The gas fraction which can also be used as a fuel is composed mainly of hydrogen and light hydrocarbons. The solid products present unique features for the utilization as sorbents or as catalyst supports by the preparation of granulated activated chars, briquettes and carbon coated monoliths, with advanced textural and chemical properties.
Pyrolysis towards the manufacturing of valuable products
CALVILLO LAMANA, LAURA;
2009
Abstract
Pyrolysis of coal or any carbonaceous material is a good method for producing valuable products such as gases, liquids and char. It has the advantage, versus other conversion technologies, of promoting the transfer of hydrogen from the parent material to the gas and the liquid products, concentrating the carbon in the residual char which can be an important improvement in the present scenario, in which carbon-free or at least low carbon fuels need to be promoted to reduce CO2 emissions. In this sense, pyrolysis has been claimed as an alternative to incineration or land filling for valorization of wastes of hydrocarbon nature. Yields and composition of each product fraction obtained after pyrolysis depend not only on the reaction conditions but also on the experimental system used for the process. In general, the liquids contain a complex mixture of compounds of 5-20 carbons with a high proportion of aromatics that can be used directly as fuels or as petroleum refinery feedstocks. The gas fraction which can also be used as a fuel is composed mainly of hydrogen and light hydrocarbons. The solid products present unique features for the utilization as sorbents or as catalyst supports by the preparation of granulated activated chars, briquettes and carbon coated monoliths, with advanced textural and chemical properties.
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