Properties of Heat Treatment Alkaline Pulping Black Liquor
For a large-scale industrial separations and purifications of the lignin in the alkaline pulping, we use aluminum chloride as a catalyst to heat the alkaline pulping black liquor, in order to discuss effects in the nature of high temperature heat treatment process in the alkaline pulping black liquor and aluminum chloride on the nature of alkaline pulping black liquor. The results show that temperature increased and the lignin and carbohydrate content increased and the solids content and pH decreased in the high temperature heat treatment process. When joining the catalyst aluminum chloride, lignin, carbohydrates, solids content and pH value were increased, and increased with increasing amount of aluminum chloride. It proves that the Aluminum chloride plays a big role in the process of the alkaline pulping black liquor heat treatment. It will provide some theoretical basis of the heat treatment of alkaline pulping black liquor.