STUDY OF THERMAL DISSOLUTION IN ETHANOL OF SAPROPELS FROM KACHKULNYA AND BARCHIN LAKES OF NOVOSIBIRSK REGION
Abstract
The thermal dissolution in ethanol of organic type sapropel (Kachkulnya lake) and organo-mineral type sapropel (Barchin lake) from Novosibirsk region was studied. It was shown that the rising of the temperature of thermal dissolution process from 200 to 400 °C results in an increase the conversion of sapropel organic matter of Lake Kachkulnya from 39,9 wt.% to 69,7 wt.% and in a decrease of extractable products yield from 40,1 wt .% to 27,4 wt.%. According to GC-MS data the extractable products obtained at 200°C mainly (up to 68,1%) consist of ethyl esters of monobasic aliphatic saturated carboxylic acids with an even number of carbon atoms in the chain (from hexadecanoic to heptacosanoic acids). In addition, they contain phenols, nitrogen and sulfur compounds, aliphatic hydrocarbons, ketones and aldehydes.
The rise of the temperature of sapropel dissolution reduces the ester content in the extractable products from 68,1 to 8,0%, and increases the content of aliphatic hydrocarbons and phenols from 3,2 to 26,9% and from 14,0 to 42,3%, respectively.
Products of thermal dissolution in ethanol of organo-mineral sapropel (Barchin lake) at 300°C have a higher content of alkanes and alkenes (by 4.6 times), lower content of phenols (by 2,1 times) and nitrogencontaining compounds (by 2,8 times) as compare to products from organic sapropel (Kachkulnya lake).
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