摘要
【目的】通过酸性介于碳酸和柠檬酸之间的有机酸与蛋壳反应制得有机酸钙,再与柠檬酸反应,置换出柠檬酸钙。【方法】试验对有机酸进行筛选,选定有机酸为乙酸。对试验过程中的各个影响因子进行研究,得到最佳工艺条件。采用三元二次回归正交旋转组合设计对试验进行优化,然后对产品进行纯化处理。【结果】优化后的最佳工艺条件为蛋壳过量30%、固液比1﹕19.8、蛋壳粉与乙酸在25.4℃下反应3.5h、柠檬酸与乙酸钙在50℃下反应3h、加入柠檬酸的不足量为25.4%。【结论】在优化后的最佳工艺条件下利用蛋壳制备柠檬酸钙的产率为86.2%,纯化后的最终产率为85.4%,纯度达99%以上。
[Objective] Organic acid, which it＇s acidity is between the carbonic acid and citric acid, reacted on eggshell calcium, and the calcium organic acids were produced. Then let it react on citric acid and the calcium citrate can be replaced. [Method] Organic acid was screened in the experiment, then the acetic acid was chosen as an organic acid. The influencing factors during the process of experiment were studied, then the first-rank conditions for techniques were gained. The experiment adopted a design of ternary operator-regression, median and circumgyrating-in quadratic to optimize the techniques, and then purification of products was made. [Result] After optimization, the first-rank techniques possessed 5 characters： eggshell mix was 30% more than the normal, the ratio between solid and liquid was 1：19.8. the powder of eggshell reacted on acetic acid under 25.4℃ and lasted for 3.5 hours, citric acid reacted on acetic calcium under 50℃and lasted for 3 hours, citric acid mix was 25.4% less than the normal. [Conclusion] Under the first-rank techniques condition after optimization, the experiment on making use of eggshell to manufacture calcium citrate has a yield of 86.2% and after purification, the yield reaches 85.4% and the purity reaches 99% or more.
出处
《中国农业科学》
CAS
CSCD
北大核心
2010年第5期1031-1040,共10页
Scientia Agricultura Sinica
基金
国家"十一五"科技支撑项目(2006BAD05A17)
国家"948"计划项目(2006-G36)
关键词
禽蛋
蛋壳
柠檬酸钙
综合利用
poultry egg
eggshell
calcium citrate
comprehensive utilization
