Studies on Catalytic Hydrotreating of Recycled Solvents from Coal Liquefaction Process(Part 1) Characteristic Changes of Recycled Solvents during Hydrotreating.

Abstract

A bituminous coalliquefaction process, called the NEDOL process, is under development by the New Energy and Industrial Technology Development Organization (NEDO). Important features of this process include the capacity to produce hydrogen-donatable solvents, obtained by hydrogenation of middle distillates of coal derived oils, and to recycle these solvents to a liquefaction stage as hydrogen donor solvents. These recycled solvents, obtained by liquefaction of Wandoan coal, and their catalytic hydrotreated oils, have been extensively characterized, using a variety of analytical methods. The following items have been examined and are discussed in this study: (1) Influence of chemical hydrogen consumption on the reactivities of hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodeoxygenation (HDO) and hydrogenation of aromatic-rings, during hydrotreating; (2) Changes in composition of hydrocarbon types, nitrogen-and oxygen-containing compounds, as a function of chemical hydrogen consumption; (3) Changes of average molecular weights; (4) Characteristics changes of oxygen-and nitrogen-containing compounds, and reactivities of HDO and HDN; (5) Characteristics

96/00311 Studies on catalytic hydrotreating of recycled solvents from coal liquefaction process. Part 3. Investigation of storage stabilities of recycled solvents

“…The following items have been investigated in this study: (1) comparison of the hydrogenation reactivity of the recycled solvents derived from Illinois No. 6, Battle River, and Wandoan coals, obtained from a 1t/day PDU; (2) characteristics changes of the solvents during storage and the influence of catalytic activities on hydrogenation;…”

Studies on Catalytic Hydrotreating of Recycled Solvents from Coal Liquefaction Process(Part 3) Investigation of Storage Stabilities of Recycled Solvents.

“…The following items have been investigated in this study: (1) comparison of the hydrogenation reactivity of the recycled solvents derived from Illinois No. 6, Battle River, and Wandoan coals, obtained from a 1t/day PDU; (2) characteristics changes of the solvents during storage and the influence of catalytic activities on hydrogenation; (3) a comparision of catalyst performance on hydrogenation between newly developed and commercial catalysts, based on the result of storage stability test.…”