Kinetic study of primary hydrogenation reaction in brown coal liquefaction (BCL) process

Abstract

Publisher Summary This chapter presents a model for the brown-coal-liquefaction reaction that is constructed using results from the 0.1t/d Process Development Unit (PDU) experiments and shows the applicability of this model to the 50t/d Pilot Plant (PP) results. The calculated yields obtained from the reaction model shows good agreement with the actual experimental yields that prove the validity of the reaction model for the brown-coal-liquefaction reaction. New Energy and Industrial Technology Development Organization (NEDO) and Nippon Brown Coal Liquefaction Co., Ltd. (NBCL) have developed a coal liquefaction process (BCL process) suitable for Australian brown coal. It is a two-stage process that is composed of new slurry-dewatering, primary hydrogenation, de-ashing, and secondary hydrogenation sections. The primary hydrogenation section is the thermal decomposition reaction that occurs mainly in the preheater, and the hydrogenation and hydrocracking reactions occur in the reactors. Many researchers conducted quantitative analysis to describe these reactions, but most are concerned with reactions using bituminous or subbituminous coal. Kinetic study on brown-coal-liquefaction reactions is also reported.