海带的碳酸钠消解过程动力学

Dissolution kinetics of alginate from Laminaria japonica

以海带为原料,考察了消解反应温度、碳酸钠浓度、搅拌速度及海带块尺寸对消解反应动力学、褐藻胶收率及产品黏度的影响。结果表明,随温度、碳酸钠浓度、搅拌速度的升高,消解反应速度明显加快,褐藻胶提取速率随之增大。海带块大小对反应速率也存在一定的影响,海带块越小,褐藻酸钠提取反应速率越快。确定的较佳消解条件为:Na2CO3浓度为0.5%,消解温度为60℃,搅拌速度200r/min,海带块尺寸为20 mm。在此条件下,产品的产率可超过22%,黏度超过了20 000 mPa.s。研究结果为优化传统海带消解工艺,节约碱耗,缩短反应时间、提高产品收率和品质提供了参考。

In this paper,the Dissolution kinetics of sodium alginate extracted from Laminaria japonica and its influence factors including reaction temperature,concentration of Na2CO3,stirring rate and size of algae piece were investigated.The results have shown that with the increases of reaction temperature,concentration of Na2CO3,stirring rate and the decrease of block size of L.japonica piece,the dissolution rate was increased obviously.Both the yield rate of sodium alginate and the quality,especially the viscosity of the product were evaluated.The optimal dissolution condition was determined as follows: 0.5% of Na2CO3 concentration,60℃ of digestion temperature,200 r/min of stirring rate and 20 mm of the algae piece size.Under this condition,the product yield rate could be more than 22%,and the viscosity of sodium alginate product could be more than 20 000 mPa.s.These results have