CAJ | 학술논문

针对柠檬酸与碳酸钙反应制备柠檬酸氢钙的过程，采用FTIR、EA、TGA和PXRD等表征方法，研究了不同温度下的反应结晶机理、结晶产品及其结晶水含量。实验发现，在柠檬酸与碳酸钙的反应过程中，首先生成柠檬酸钙，当起始柠檬酸与碳酸钙摩尔比≥2：3时，柠檬酸钙可与剩余的柠檬酸继续反应生成柠檬酸氢钙。其中，当反应温度20℃以下，最终结晶产品为柠檬酸氢钙三水合物；当反应温度40℃以上，最终结晶产品为柠檬酸氢钙一水合物；当反应温度20~40℃，最终结晶产品则为柠檬酸钙四水合物。
침대저몽산여탄산개반응제비저몽산경개적과정，채용FTIR、EA、TGA화PXRD등표정방법，연구료불동온도하적반응결정궤리、결정산품급기결정수함량。실험발현，재저몽산여탄산개적반응과정중，수선생성저몽산개，당기시저몽산여탄산개마이비≥2：3시，저몽산개가여잉여적저몽산계속반응생성저몽산경개。기중，당반응온도20℃이하，최종결정산품위저몽산경개삼수합물；당반응온도40℃이상，최종결정산품위저몽산경개일수합물；당반응온도20~40℃，최종결정산품칙위저몽산개사수합물。
The monohydrate and trihydrate of calcium hydrogen citrate were firstly prepared and character-ized by use of FTIR,EA,TGA and PXRD. Meanwhile,the reaction progress of citric acid and calcium car-bonate was investigated as well. In general,calcium citrate is firstly obtained after the reaction of citric acid and calcium carbonate,and then transforms respectively into monohydrate or trihydrate of calcium hy-drogen citrate at different temperatures when the initial reactant molar ratio of citric acid and calcium car-bonate is larger than 2:3. The final crystallization products will be calcium hydrogen citrate monohydrate, calcium hydrogen citrate trihydrate and calcium citrate tetrahydrate respectively when the reaction temper-ature is 20~40 ℃.