Pyshyev Serhiy

Title : Study of optimal conditions for extraction by toluol and humic acids from lignite

Abstract:

The aim of the study is to develop optimal conditions for obtaining toluene extract and humic acids from brown coal of Ukraine, as well as to determine their proximate and ultimate analysis, aromatic carbon content, degrees of hydrogen unsaturation and molecular association of organic matter.
To determine the yield of toluene extract and humic acids used standardized methods such as ISO 975:2021 Brown Coals and lignites – Determination of yield of benzene-soluble extract – Semi-automatic method ?? ISO 5073:2021 Brown coals and lignites – Determination of humic acids.
In addition, 3 methods were developed for obtaining toluene extract and humic acids, which differed from the standardized by weight of the sample, extraction conditions, volume and concentration of reagents, the procedure for extracting toluene extract and humic acids.
 It has been found that milder extraction conditions lead to a decrease in toluene extract yield from 14.86 to 5.32 %. At the same time, increasing the amount and concentration of NaOH leads to an increase in the yield of humic acids from 41.0 to 51.7 %. If the quality indicators of toluene extract were practically unchanged, the quality of humic acids has undergone some changes: the carbon content has fallen from 57.4 to 51.8 %; hydrogen content increased from 3.8 to 4.5%, N^d+S^d_t+O^d_d content increased from 34.9 to 38.4%.
Determination of the yield of free humic acids to determine the yield of toluene extract from brown coal leads to the fact that the yield of free humic acids is 47.39-48.32 % and the yield of toluene extract 1.79-5.28 %, moreover, the use of the extraction apparatus significantly (almost 3 times) increases the yield of toluene extract. Indicators of ultimate analysis of humic acids are: ?^d=61.7-61.8 %; H^d=4.0-4.1 %; N^d+S^d_t+O^d_d=29.1-29.2 %, quality indicators of toluene extract are: ?^d=79.6-79.9 %; H^d=12.6-12.9 %; N^d+S^d_t+O^d_d=6.9-7.5 %.
The yield of toluene extract from humic acids was further determined. It was found that it is possible to further remove 0.48 % of toluene extract from humic acids.
For the first time, studies were performed on the influence of conditions (weight of the sample, extraction conditions, volume and concentration of reagents, procedure for extraction of toluene extract and humic acids) of toluene extract and humic acids on their yield and quality indicators.
 The implementation of the research results will allow to regulate the yield and quality indicators (proximate and ultimate analysis) of toluene extract and humic acids. The use of the developed methods will help increase the profitability of enterprises specializing in the extraction of toluene extract and humic acids from brown coal in Ukraine.
Keywords: humic acids, brown coal, toluene extract, yield, quality, extraction
Audience take away:

As a result of familiarizing the audience with the report, they will be able to optimize the method for extracting humic acids and benzene extract from brown coal. This will help specialists to get the maximum benefit from the available resources of brown coal, significantly increase the efficiency of their work, as well as receive a theoretical basis for further research.

Biography:

Serhiy Pyshyev studied Chemical technology of fuel and carbon materials at the Lviv Polytechnic National University, Ukraine and graduated in 1994. In 2001 he became an Associate Professor of the Department of Chemical Technology of Oil and Gas Processing in Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University. In 2014 Serhiy became a Professor at the same institution. He became a Doctor of Technical Sciences, Chemical Technology of Fuel and Fuel-lubricating materials in 2013. Also, he is member of the editorial board of the Journal of Coal Chemistry since 2018, and CHEMISTRY & CHEMICAL TECHNOLOGY since 2021. Besides, he is Co-Chairman of the Organizing Committee, "Advance in Petroleum and Gas Industry and Petrochemistry" (APGIP-11), XI International Scientific-Technical Conference. Serhiy has published more than 50 research articles in SCI(E) journals.