Supercritical fluid extraction of coal

摘要

Supercritical carbon dioxide extraction as a promising way to analysis of coalfields deposits and chose the way for their primary processing. Eight samples of different coals from Primorye region have been extracted by supercritical carbon dioxide. Extractive capacity for supercritical CO2 were studied in dependence from the temperature, pressure and the addition of co-solvents. Seven samples were brown coal and one was rock coal. It has been experimentally shown that the addition of co-solvents can significantly increase the degree and rate of extraction. Analysis of the extracts revealed that despite the fact that some of the substances in all coals were identical nonetheless all extracts were unique. Results of extracts analysis may be used to identify coalfields and for evaluation their prospects for the supercritical extraction. It was shown that most of Primorye Region's coalfields valuable for industry to purify a compound – Melicopidine (according to the literature melicopidine has antitumor, immunomodulatory and antioxidant activity).