HUMIC ACID AND HUMIC ACID SALT PRODUCTION PROCESS Russian patent published in 2006 - IPC C05F11/02 

FIELD: naturally occurring substances production processes.

SUBSTANCE: invention relates to production of humic substances employed in multiple industrial fields, in agriculture, and also to protect and restore biotope. Process of invention is based on oxidation of organic raw material with acid mixture aqueous solution on heating, said acid mixture aqueous solution being aqueous solution of mineral and organic acids particularly containing 3-10% of nitric acid and 3-10% of acetic acid. Process is conducted in reactor provided with disintegrator-heater involving recirculation with reaction mixture recycle ratio within a range of 1 to 10 at atmosphere pressure, oxidant-to-organic raw material ratio (2.0÷5.0):1, and reaction time 10-30 min followed by separation of mixture into solid and liquid phases. To obtain humates, solid phase containing humic acids is treated with alkali or aqueous ammonia, or sodium hydroxide to achieve pH 6.0-7.0 and liquid phase is returned into process.

EFFECT: increased yield of humic acids with no increase in reaction mass volume and increased sorption coefficient in product.

2 cl, 1 tbl