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

Title of the article: Study of the effect of leaching factors on the functional-group composition of humic acids extracted from of brown coal

Year: 2015, Issue: 6, Pages: 111-116

Branch of knowledge: Chemical technology

Index UDK: 662.73: 631.41

DOI: -

Abstract: Аbstract. The actuality of study Study of parameters for extraction of humic acids (HA) from brown coal is needed to obtain a HA with a specific functional group composition associated with their biological activity. To determine the regularities of the process of leaching HA from brown coal 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. The main aim of the study:the matrix of experimental design to identify patterns of leaching process HA on three factors, to determine the functional-group composition of the HA, and calculate structural parameters: the degree of aromaticity fa, hydrophilic-hydrophobic parameter fh/h, aromaticity/aliphaticity far/al. Based on the obtained data, calculate the regression equation. The methods used in the study: Statistical data processing was performed by the method of mathematical planning of the experiment with the construction of the planning matrix. Quantitative CPMAS 13C NMR determined Functional-group composition. The results: received adequate (at the significance level α=0,05) and regression equation of dependence of the structural parameters: the degree of aromaticity (fa), hydrophilic-hydrophobic (fhh), and aromaticity/aliphaticity (far/al) of the three factors of the leaching process HA: "amount of NaOH, g", "temperature, ºC" and "duration, h". To obtain the preferred parameters of the leaching of the HA with the maximum values of fa, fhh and far/al should support the factor "amount of NaOH, g" at high values, and the factors "temperature, ºC" and "duration, h" to low values in accordance with the planning matrix.

Key words: brown coal humus humic acids biological activity

CITE DOWNLOAD