Low rank coals upgrading by mild pyrolysis technique

Nowadays existing technologies of coal upgrading use two-stage process: coal drying and pyrolysis. One of these technologies is upgrading of low rank coals by mild pyrolysis known as LFCTM process (means Liquids From Coal). Upgrading of low rank coals by LFCTM process results to stable, high efficiency solid fuel named PDFTM (Process-Derived Fuel). Up to 10-12 % of liquids pyrolysis products named CDLTM (Coal Derived Liquids) are available from this process. Apparently significant quantity of valuable chemicals such as phenols, cresols and hydrocarbons may be obtained by a simple processing of the pyrolysis tar. Is well known that water influenced on the yields and properties of pyrolysis products. An increase in the liquid products yield and, on the contrary, a decrease in the char yield, change in the elemental composition and absorption properties of chars during steam pyrolysis of coals were reported by number of researchers earlier.