Two-Stage Coal Liquefaction Studies. Volume 2. Close-Coupled Reactor Option. Final Report

摘要

A 0.2 TPD integrated coal liquefaction bench-scale unit was designed, constructed and operated at Kerr-McGee Corporation Cimarron Facility during the period from June 1981 through December 1984. The two-stage (Thermal and Catalytic) unit includes a coal liquefaction section for dissolution of coal, a Critical Solvent Deashing (CSD) section for deashing of coal liquids and a Hydrotreating section for upgrading of liquid products. An experimental program was initiated to evaluate the technical feasibility of advanced coal liquefaction processes involving selective recycle of process streams to produce environmentally-acceptable fuel and usable by-products. This report summarizes the studies completed in the integrated unit during the period of August-December 1984. A new process configuration was tested for the first time during this period. Illinois No. 6 coal was liquefied in what is termed closed-coupled integrated mode of operation. In this process configuration, the liquefaction and hydrotreating steps are close-coupled. The hydrotreating step is followed by Critical Solvent Deashing (CSD) to remove and separate coal ash and unconverted coal. In the closed-coupled operation, a high distillate yield and good overall process results could be obtained but at the expense of a faster catalyst deactivation. In addition to the testing of a new process configuration, Texas lignite was liquefied for the first time in the bench-scale unit. Overall, Texas lignite performed without substanstial feedstock deashing prior to liquefaction, liquefied easily but had problems with Critical Solvent Deashing and high energy rejections to ash concentrate. 3 refs., 6 figs., 28 tabs. (ERA citation 11:004705)