PROCESS FOR PREPARING ALKALI SALTS OF LOW MOLECULAR HUMIC ACID

摘要

Alkali salts of low molecular weight humic acids are prepared by oxidising polyhydric phenols in weakly alkaline aqueous medium at a temperature in the range from 15 to 40 DEG C, then adjusting and/or buffering the reaction mixture to a pH in the range from 6.2 to 7.2 and purifying the low molecular weight alkali humates by preparative chromatographic methods, ultrafiltration, ultracentrifugation or electrodialysis and separating off from undesired by-products.