传统的红糖生产采用石灰法清净蔗汁，产品中含有较多的钙和残留的絮凝剂。 海藻酸钠 ( SA) 含有大量羧基，对钙离子有很强的螯合作用。文中探究了 SA 在红糖溶 液脱钙中的应用，考察了 SA 用量、糖液中的红糖含量、反应温度和 pH 值等因素对钙脱除率及 SA 反应效率的影响。结果表明: 红糖溶液的 SA 絮凝沉淀物 ( 主体) 为海藻 酸钙，钙脱除率和 SA 反应效率最重要的影响因素为 Ca∶ SA 单元摩尔数比，SA 用量越大，钙脱除率越高，SA 反应效率越低; Ca∶ SA 单元摩尔数比在 2. 5 左右时，适宜的红糖含量为 50%～ 60% ，SA 反应效率约为 90% ; 温度对钙脱除率和 SA 反应效率也有一定影响，温度为 50 ～ 60℃时具有最好的脱钙效果，对溶糖操作也有利; pH 值在 5. 1 ～ 9. 0 范围内时的脱钙效果比较相近，故无需调节pH 值，可以直接采用水溶商品红糖所得的糖液。用 SA 脱除红糖溶液中的部分钙离子并用作絮凝剂，具有安全可行性。

Traditional brown sugar production uses lime to clean cane juice，and the product contains a large amount of calcium and residual flocculants． Sodium alginate ( SA) contains a large number of carboxyl which has a strong chelation on calcium ions． This article explored SA's application to decalcification of brown sugar solution， and examined the effects of SA dosage，brown sugar solution's content，reaction temperature，and pH value on the calcium removal rate and reaction efficiency of SA． The results show that: the SA flocculent precipitate ( main body) of the brown sugar solution is calcium alginate; the unit mole ratio of Ca∶SA is the most important influencing factor of the calcium removal rate and the reaction efficiency of SA． The larger the dosage of SA is，the higher the removal rate and the lower the reaction efficiency of SA are． When the unit molar ratio of Ca∶SA is about 2. 5， the suitable mass fraction of brown sugar solution is 50% ～ 60% ，and the reaction efficiency of SA is about 90% ． Temperature also has a certain effect on the calcium removal rate and reaction efficiency of SA． The calcium removal rate is the highest when temperature is 50 ～ 60 ℃，and this temperature range is also good for dissolving operation． The removal effect is similar in the pH range of 5. 1 ～ 9. 0，so sugar solution can be obtained by directly using water-soluble commercial brown sugar without adjusting the pH value． It is safe and feasible to remove some calcium ions from the brown sugar solution by SA and to use the product as a flocculant．