Extract of willow barks or willow branches and method for preparing salicin
A salicin and extract technology, applied in the field of chemical engineering, can solve the problems of large consumption of organic solvents, environmental hazards of organic reagents, and high cost, and achieve the effects of easy industrialization, cost reduction, and low cost
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[0032] The invention provides a method for preparing extracts from willow bark or willow branches and further refining salicin, specifically water extraction, ultrafiltration, adsorption separation (or decolorization after adsorption separation) and crystallization to obtain water Products with higher salicin content.
[0033] If the extract of willow bark or willow branch is prepared, it is only necessary to obtain a product with a salicin content of 40-60%, the following method can be used:
[0034] A, using willow bark or willow branches as raw materials, extracted with water;
[0035] B, filter the extract;
[0036] C, the filtrate is separated by resin adsorption;
[0037] D. crystallization;
[0038] It is characterized in that: step B is filtered by ultrafiltration: the extract is first passed through a 100-500kD ultrafiltration membrane, and then passed through a 5-10kD ultrafiltration membrane, and the average membrane flux is controlled at 100-190LMH and 20-24LMH ...
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