Solid acid for hydroliquefaction of a lignite from Xinjiang

To achieve the lignite mild liquefaction to high-added value phenols,a new solid acid catalyst was developed to ensure the low cracking under mild condition.Physical property characterization and activity evaluation of the catalyst were conducted.The influences of catalyst type on the reaction and product distribution under the mild condition were studied.The feasibility research on solid acid catalyst used in mild direct coal liquefaction was discussed.The results show that strong acid site forms with the particle diameter of solid acid decreasing.Under the conditions of 430 ℃ and 15 MPa,coal conversion ratio and oil yield are similar to that of traditional process.Phenols yield increases by 1.5% and gas yield decreases by 4%.The solid acid catalyst is beneficial for energy conservation,emissions reduction,efficiency increase and products optimization.The solid acid catalyst used for direct coal liquefaction should be focused,and further study is needed because of its good coal conversion activity and selectivity.