DOI: 10.36347/sjavs.2020.v07i02.002

Pages: 30-34

In this study, the effects of concentration of Na2CO3, time of digestion, and temperature of digestion on the extraction rate of sodium alginate by calcium coagulation-ion exchange were investigated by single factor test and orthogonal test using commercially available kelp as raw materials. Results show that concentration of Na2CO3 effects on extraction yield of sodium alginate is of high significance, temperature of digestion and time of digestion have less effect on the extraction yield of sodium alginate. The best experiment condition is obtained by the analysis of the orthogonal experiment results, when concentration of Na2CO3 is 8%, digestion time is 3 h, and temperature of digestion is 50°C, the highest extraction yield of sodium alginate is achieved. The viscosity of sodium alginate solution was 131 Pa•s-1 (20°C) in the product.