Effect of lower alcohols on the properties of humic acid ethoxylation products
S. L. KHIL’KO, R. A. MAKAROVA, R. G. SEMENOVA, V. S. SHELEST, M. I. ROGATKO
L. M. Litvinenko Institute of Physical Organic and Coal Chemistry, Donetsk, Russia
Keywords: humic acids, hymatomelanic acids, ethoxylation, mechanochemical treatment, IR and UV spectroscopy, acid-base potentiometric titration, tensiometry, dilatational rheology
Abstract
The properties of hymatomelanic acids extracted with lower alcohols (methanol, ethanol, n-propanol) from native (unmodified) and ethoxylated humic acids were studied. Humic and hymatomelanic acids were characterized by IR and UV spectroscopy, and the aqueous solutions of their sodium salts were characterized by acid-base potentiometric titration, tensiometry, and dilatational rheology. It has been established that lower alcohols facilitate the extraction of native and ethoxylated hymatomelanic acids, which differ in structure and properties. Ethoxylation products have been found in hymatomelanic acids and in the residues of humic compounds after alcohol extraction. The aqueous solutions of sodium salts of humic, hymatomelanic acids and their ethoxylated forms exhibit pronounced surface-active properties at the interface with air.
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