Authors: S.I. Zherebtsov, N.V. Malyshenko, Z.R. Ismagilov

Title of the article: Modification of brown coal organic mass by alcohols

Year: 2017, Issue: 1, Pages: 128-133

Branch of knowledge: Chemical technology

Index UDK: 665.7.032.56

DOI: -

Abstract: A method for producing lignite and peat wax in a high yield and improved quality was developed comprising the pretreatment of lignite or peat by aliphatic alcohols at the boiling alcohol temperature in the presence of protonic acid and subsequent extraction with organic solvents. The proposed method of low-temperature processing of solid fuels (SF) allows you to receive up to 75% of bitumen and humic acids from alkylated SF in a single small-step sequential scheme. The composition of the fractions of the original bitumen and alkylated coal and peat was determined. It was found that the fraction of wax and resins from the extractive alkylated SF contained, besides the native esters, esters formed by the alkylation treatment. It was shown that sequential alkylation and removal of bitumen in humic lignite led to an increase in the content of aromatic structures obtained from humic acids of modified sources. These humic acids are similar in composition to highly active natural humic substances of naturally-oxidized brown coal at maturity stage and exhibit enhanced biological activity.

Key words: lignite brown coal peat bitumen humic acids

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