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[References: 15 tit.]

The solution of a number of the tasks directed on optimization of processes of complex processing ofpeat for needs of industries and agricultural production includes technologies of regulation of an exit ofvaluable group components one of which are peat humic acids (HA). The analysis of the methods directed onincrease in extent of extraction of humic acids presented in article showed the most optimum way oftemperature impact on a feed stock as a result of which there is a change of structure and properties of themodified HA. By a complex of physical and chemical methods it is established that the preliminary thermolysisof peat is method of modification of structure of HA leading to removal of unstable side structural fragments ina macromolecule and to increase in a share of nuclear part.