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REGENERATED HUMIC ACIDS OBTAINED BY THE AIR OXIDATION OF SOUTH MORAVIAN LIGNITE. PART. 1. PRODUCTION AND CHARACTERIZATION.

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Author(s): Jiří Kučerík | Zdeněk Cihlář | Zoja Vlčková | Martin Drastík

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 50;
Issue: 3;
Start page: 49;
Date: 2008;
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Keywords: lignite | regenerated humic acids | air oxidation

ABSTRACT
The influence of lignite air oxidation on the yield and chemical/physical character of regenerated humic acids(RHA) has been studied. RHA were produced under different experimental conditions, i.e. both in static and fluidreactor. Oxidation in the fluid reactor brought first a decrease and after a certain period increase in the yield ofRHA. The same observation was done in case of static reactor. It has been verified that higher temperatureduring the oxidation supports the production of RHA. Despite the difference in the yield of RHA (increase up to75%) their chemical character was in all cases fairly similar. Some tiny differences were revealed using FTIRwhich showed the increase in number of ester bonds in RHA produced mainly at temperatures above 80°Ccausing a significant increase in apparent molecular weight as evaluated by HPSEC.
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