Title: Integration of advanced preparation with coal liquefaction. Final technical progress report, October 1, 1983-September 30, 1985
Abstract: A four step process has been investigated to prepare coal for direct liquefaction. The steps are (1) wet grinding of coal in water, (2) removal of chlorine, sodium and calcium, release of mineral matter and incorporation, if desired, of a disposable catalyst by hot-water treatment at elevated pressure, (3) oil agglomeration using a liquefaction product fraction to dewater and deash coal while retaining pyrite, and (4) solvent drying of coal agglomerates to minimize oxidation of coal, improve coal liquefaction reactivity, save energy and prepare the coal/solvent slurry for liquefaction. Fresh Illinois No. 6 and Wyodak upper and lower seam coal samples were obtained from the mine. The Illinois No. 6 and Wyodak upper seam coals were used in this study. They were analyzed before and after wet grinding. Some chlorine is lost from Illinois No. 6 coal and ash content increases, probably due to wear on the iron balls in the ball mill. Very fine grinding did not release more than about 50% of the ash such that it could be separated from the coal. Wet grinding did not completely protect the coal surface from oxidation. Coal derived liquid samples were obtained from the C.E. Lummus ITSL direct liquefaction process.more » These include -343 C products and +343 C recycle solvents prepared from both Illinois No. 6 and Wyodak coals and a doubly hydrogenated product fraction for use in the oil agglomeration studies. Each fraction was analyzed and distilled into 50 C cuts for use in the oil agglomeration studies. The recycle solvents were also used in the microautoclave liquefaction reactivity tests. 14 refs., 45 figs., 37 tabs.« less
Publication Year: 1985
Publication Date: 1985-09-30
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot