Studies of coal pretreatment in direct liquefaction

摘要: Studies have been done on pretreatment of three coals from the Argonne Sample bank (Zap Lignite, Wyodak subbituminous, and Illinois No. 6 bituminous). For each coal, samples dried, ion-exchanged (using ammonium acetate), methylated, demineralized HCI/HF) coal were prepared. The starting characterized by several techniques (FT-IR, TG-FTIR, SEM/x-ray, FIMS, elemental analysis). Liquefaction experiments at 400{degree}C (30 min) in dihydrophenanthrene (DPH). trends for improved liquefaction yields found to parallel tar lower CO{sub 2} a programmed pyrolysis treatment.