METHOD OF MEDICINAL LIGNIN PRODUCING Russian patent published in 1998 - IPC

FIELD: medicine. SUBSTANCE: method involves alkaline treatment of hydrolytic lignin, preparing lignin alkaline suspension, lignin washing out with water, washing water removing, lignin neutralization with acid, separation of acid filtrate, lignin washing out with water from acid excess, washing water removing and lignin milling. Before lignin washing out with water alkaline suspension is separated on static electrooosmotic filter under effect of air feeding under pressure 380-500 kPa at permanent current field at field intensity (5-10) x 10^-2 V/m and current power 100-150 A. Process of separation of lignin alkaline suspension is carried out at 60-70 C for 15-20 min. Duration of field effect during separation of lignin alkaline suspension on static electroosmotic filter is 1-5 min. Invention can be used for lignin-containing raw processing for preparing medicinal preparations. EFFECT: improved quality, decreased loss. 6 cl