Studies on the Preparation and Purification of Alginic Acid by Electrodialysis-IV
On the Decolorization of Alginic Acid with Chlorine Gas Blowing
1956 Volume 22 Issue 2 Pages 108-111
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1956 Volume 22 Issue 2 Pages 108-111
With the objects of decolorization of sodium alginate soln. and of decreasing total N content, comparison has been made between the two methods, that is, chlorine gas blowing and electrolytic bleaching. From the relations between bleaching condition and the purity and properties of alginic acid, it was found that 13l. of chlorine gas was the most appropriate for decolorizing 800cc of 1.25% sodium alginate soln.
A sodium alginate soln. decolorized with this amount of chlorine gas was electrodialyzed with three chambers. The results attained after the electrodialysis of 7.3 ampere-hours were as follows: electric energy consumption and yield of alginic acid, 69.8 KWH/kg. and 23%, respectively. By this method, total N content could not be reduced to less than 1%, but the ashcontent could be reduced to 0.5%.
