in: Functions of Natural Organic Matter in Changing Environment, Jianming Xu,Jianjun Wu,Yan He, Editor, Springer, London/Berlin , London, pp.1101-1104, 2013
The development of a feasible method for fulvic acid production in an
industrial-scale system was the main objective of this research. Purification of
fulvic acid extracted from leonardites via the formation of fulvic acid ester was
investigated. Extraction from leonardite and esterification of fulvic acid with
ethanol, precipitation and separation of ethyl fulvate, hydrolysis of ester, recovery
of ethanol and separation and drying of fulvic acid were studied experimentally.
Optimum operating conditions were determined. Based on these findings, a pilot
plant was designed.