| 摘要 |
FIELD: leather industry. ^ SUBSTANCE: method comprises extracting tannins from oak raw using hot water and subsequent drying of plastic-state product at temperature not higher than 90°C until crystalline state is attained. Extraction is carried out at 75-85°C when using pulsar and thickening membrane filter. ^ EFFECT: enabled environmentally appropriate preparation of tannins at lowered power consumption and avoiding use of chemicals. ^ 1 dwg |
