GOYNUK BROWN COAL AND GOYNUK OIL-SHALE - SUPERCRITICAL EXTRACTION WITH WATER AND WITH WATER-TETRALIN MIXTURES

Goynuk Brown Coal and Goynuk Oil Shale were extracted with supercritic al water respectively supercritical water-tetralin-mixtures. The press ure was varied from 1 to 300 bar when the solid fuels were extracted w ith water The pressure was 300 bar and the H-donor tetralin was added from 0 to 20 wt% when the solid fuels were extracted with the water-te tralin-mixtures. The highest extraction temperature was 550-degrees-C. Furthermore, Goynuk Brown Coal was prepared with a catalyst (Rotmasse ) in some experimental runs. The experimental investigations have show n that supercritical water is a good solvent for both solid fuels. Hig h conversion degrees and high yields of extract can be reached. With t he help of the H-donor tetralin a further increase of the conversion d egree and the extract yield can be obtained. When Rotmasse is added to the Goynuk Brown Coal no influence to lighter products during the ext raction of the Brown Coal with water-tetralin-mixtures can be seen. Wi th the non-isothermal experimental technique used it was possible to c alculate the activation energy and the frequency factor for the extrac tion of Goynuk Brown Coal and of Goynuk Oil Shale with supercritical w ater respectively supercritical water-tetralin-mixtures.