【摘要】 我国拥有丰富的鸡蛋壳资源,而对蛋壳的相关开发研究却很少,未利用的蛋壳被成批地抛入垃圾堆,不仅造成了环境的污染,同时也是资源的浪费。蛋壳是一种很好的钙源,主要成分为碳酸钙,其含量在93%以上,且因为蛋壳是生物组织、无毒,因此是制备柠檬酸—苹果酸钙良好的钙原料。因此,本文以鸡蛋壳为钙源,以柠檬酸—苹果酸钙的溶解量为评价指标,考虑1mol·L-1柠檬酸的用量(mL)、1.5mol·L-1L-苹果酸的用量(mL)、反应温度(℃)三个因素,运用二次回归正交设计对柠檬酸—苹果酸钙的制备工艺进行优化。结果表明,当1mol·L-1柠檬酸溶液用量为30mL、1.5mol·L-1L-苹果酸溶液用量为30mL(即体积比为1∶1)、反应温度为44.6℃时,柠檬酸—苹果酸钙的溶解量达到最大,此时制得的柠檬酸—苹果酸钙的溶解量达0.356mol·L-1。更多还原

【Abstract】 There are abundant resources of egg shell in China but fewer studies were related to egg shell. Unused egg shells are not only pollute our environment,but also waste the resources. The shell’s component is about 93% calcium carbonate,which is a good source of calcium. In addition,the egg shell is biological tissue and non- toxic,so it is a good calcium in producing citrate malate. This study takes the egg shell as calcium sources,citric acid- calcium malate solubility as evaluation index,three elements includes the amount of 1mol·L- 1citric acid( mL),the amount of 1. 5mol·L- 1L malic acid( mL),and reaction temperature( ℃) as study factors. Optimization of the preparation technology was studied by quadratic regression. The results showed that when the mount of 1mol · L- 1citric acid is 30mL,the amount of 1. 5mol·L- 1L malic acid is 30mL,( i. e. the rate of volume is nearly 1 ∶ 1),and the reaction temperature is 44. 6℃,the solubiity of citric acid- calcium malate is at its most,which is 0. 356mol·L- 1.更多还原