Alkali lignin was successfully converted to chemical derivatives which could be used as synthetic tannins for leather production. The prepared lignin derivatives were: nitrolignin, aminolignin and chlorolignin. their affinity to chromed hide powder and polyamide powder as model substances for collagen was tested by column chromatography. Aminolignin showed a higher percentage adsorption on chromed hide powder than nitrolignin and chlorolignin, indicating strong irreversible bonding. Measurements of the shrinkage temperature (Ts) of the pelts tanned with those compounds showed that the tanning effect of aminolignin on delimed pelts was satisfactory, and almost similar to the tanning effect of vegetable tannins, followed by nitrolignin, whereas chlorolignin showed a slight increase in the Ts values of tanned pelts, i.e. weak tannage properties.
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Gemei et al. (1980) studied this question.