A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Extraction of organic compounds from brown coal
The paper presents the study on the extraction of organic compounds (low-molecular weight - diterpenes, high-molecular weight - fullerenes and humic acids) from Handlová brown coal and pyrolytic soot. It was confirmed that the coal extract with a diterpene content - 16 β (H) kaurene was obtained by the supercritical fluid extraction (using CO2 and modificator - tetrahydrofurane/acetone, 8:2 w/w) at T = 90 oC and p = 30 MPa. The occurrence of fullerenes in the toluene extract of solid carbon product has confirmed by the MALDI - TOF - MS and UV-VIS spectroscopy. In the extraction process of GACL (Grinding Aqueous Caustic Leaching) at the concentration of 0.1 % NaOH, the content of humic acids (HK) in the physically untreated and pretreated sample increased by 6.09 and 4.57 times, respectively. In the case of higher leaching agent concentration (2 % NaOH), the content of HK in the physically untreated and pretreated sample increased by 8,67 and 8,21 times, respectively.
Extraction of organic compounds from brown coal
The paper presents the study on the extraction of organic compounds (low-molecular weight - diterpenes, high-molecular weight - fullerenes and humic acids) from Handlová brown coal and pyrolytic soot. It was confirmed that the coal extract with a diterpene content - 16 β (H) kaurene was obtained by the supercritical fluid extraction (using CO2 and modificator - tetrahydrofurane/acetone, 8:2 w/w) at T = 90 oC and p = 30 MPa. The occurrence of fullerenes in the toluene extract of solid carbon product has confirmed by the MALDI - TOF - MS and UV-VIS spectroscopy. In the extraction process of GACL (Grinding Aqueous Caustic Leaching) at the concentration of 0.1 % NaOH, the content of humic acids (HK) in the physically untreated and pretreated sample increased by 6.09 and 4.57 times, respectively. In the case of higher leaching agent concentration (2 % NaOH), the content of HK in the physically untreated and pretreated sample increased by 8,67 and 8,21 times, respectively.
Extraction of organic compounds from brown coal
Slavomír Hredzák (author) / Michal Lovás (author) / Silvia Čuvanová (author) / Ľudmila Turčániová (author) / Mária Skybová (author) / Anton Zubrik (author)
2005
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
| Engineering Index Backfile | 1900
Plasma processing of brown coal
| British Library Online Contents | 1995
Plasma processing of brown coal
| British Library Online Contents | 1995
Coal Sorbent System for the Extraction and Disposal of Heavy Metals and Organic Compounds
| British Library Conference Proceedings | 1996