6TH International Congress on Technology - Engineering - Kuala Lumpur3 - Malaysia (2018-07-19)

Ir Spectra Of Low-metamorphosed Barzas Coal Thermally Treated In Hydrogen Medium At Various Temperatures

Using FTIR spectroscopy, as well as elemental and chromatographic analyses, the temperature effects in the range of 400-550oC on the thermal transformations of low-metamorphosed Barzas coal (sapromixite) treated in hydrogen medium have been studied. According to the FTIR spectroscopic data, an increase in the relative content of alkyl groups (-CH3 and >CH2) in the solid residue of thermally treated sapromixite was observed with a rise in the process temperature up to ~ 475oC, followed by a rapid decrease in their concentration at higher heat treatment temperatures. Such behavior may be associated with an initial accumulation of alkyl fragments, formed from the coal matter, and their subsequent transition into the gaseous phase. A close relationship (an antibate dependence) has been discovered between H/C atomic ratios in solid products of thermally treated Barzas coal and the yields of gases formed during its hydropyrolysis. Chromatographic analysis of liquid products (an aqueous solution of oxygen-containing compounds) formed after Barzas coal heat treatment at 475oC showed that the main organic constituents of liquid phase (about 3-5% by weight) were phenol and its methyl- and dimethyl derivatives (their total content in methylene chloride extract was of > 84.5% by weight).
Ivan Petrov, Konstantin Ushakov, Alexander Bogomolov, Boris Tryasunov