Stimulation of Low-Temperature Dissolution of Organic Matter of Brown Coal, Composition of Bitumoids

Abstract

The paper presents data on the yield, chemical composition of bitumen extracted from the brown coal of the Tyulgan deposit. Bitumens were extracted from brown coal by the following methods: I) sequential extraction with ethanol, n-heptane, alcohol-benzene according to the Grefe method, II) low-temperature dissolution of the organic mass of coal (OMC) by alkylation and subsequent extraction of bitumoids; III) stimulation of alkylation by ultrasound and subsequent extraction of bitumoids. It is shown that the use of ultrasonic exposure during the O-alkylation process has a positive effect on the yield of bitumoids the yield increased to 52%. The obtained samples were studied using the methods of IR spectroscopy, C NMR (CPMAS), gas chromatography-mass spectrometry (GC-MS). A number of individual compounds were identified in the composition of bitumen and bitumoids during the study by the GCMS method: gamma-tocopherol, Stigmast-4-en-3-one, betaHydroxyallobetulan, 1-Hexadecanol, Oleyl alcohol, etc. Among the identified compounds, various biologically active substances are present.