Pyrolysis, and hydropyrolysis of a turkish lignite under high pressures

Pyrolysis and hydropyrolysis of a turkish lignite has been performed in nitrogen and hydrogen atmospheres in a now through reactor. The influence of ambient gas atmosphere (inert, reactive) and the pressure on the yield of products have been investigated. The yield of liquid and gas products is significantly influenced by the type of gaseous atmosphere. The tar and gaseous products obtained by hydropyrolysis are greater than those obtained by pyrolysis under the same conditions. The tar yield in hydropyrolysis increases substantially as the pressure increases. An increase of pressure for both pyrolysis and hydropyrolysis leads first to an increase in the yield of gaseous products than a decrease at high pressures. As a result of the reaction of char with the H-2 gas existing in the reactor in hydropyrolysis the amount of CH4 and C2H6 present in the gaseous products are substantially higher than those exist in pyrolysis. The formation rates of tar and the total gaseous products obtained by hydropyrolysis are higher than those obtained by pyrolysis.