Authors: M.Yu. Klimovich, S.I. Zherebtsov, O.V. Smotrina, Z.R. Ismagilov

Title of the article: Influence of factors alkaline extraction on the structural parameters of humic acids of sooty brown coal

Year: 2016, Issue: 3, Pages: 111-117

Branch of knowledge: Chemical technology

Index UDK: 662.73:631.41

DOI: -

Abstract: For sooty coal (SC) (brown coal) study highlight the parameters of humic acid (HA) is necessary to obtain HA with specific functional group composition, related to their biological activity. To determine the regularities of the process of leaching HA from SC from the factors: "the amount of NaOH, g", "temperature,ºC", "duration hours" and their impact on the functional-group composition of the HA, it is necessary to measure in a wide range of factor values, which requires a large number of experiments. With a view to their optimal reduction methods of experimental design. Experimental data of output of HA obtained using the rapid planning matrix 3rd order. Functional-group composition was determined by quantitative 13C NMR analysis in the solid body. Calculated adequate (at significance level α=0,05) regression equations for the structural parameters: the degree of aromaticity (fa) at hydrophilic-hydrophobic (fh/h), and aromaticity/aliphaticity (far/al) from the three factors of the leaching process, HA: "the amount of NaOH, g", "temperature ° C" and "duration". Better extraction of HA KBS depends on the amount of alkali in the solution but not on time and temperature. The structural parameters change slightly from the factors and almost reaches maximum values already at the minimum values of the factors.

Key words: brown coal humus humic acids biological activity

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