| DSC法测定甜菊糖RA40-甲醇溶液的常压比热 |
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| 引用本文： | 穆莹,王学魁,王彦飞,沙作良.DSC法测定甜菊糖RA40-甲醇溶液的常压比热[J].天津科技大学学报,2012,27(3):25-28. |
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| 作者姓名： | 穆莹 王学魁 王彦飞 沙作良 |
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| 作者单位： | 天津市海洋资源与化学重点实验室,天津科技大学海洋科学与工程学院,天津300457 |
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| 基金项目： | 天津科技大学引进人才科研基金资助项目，天津市海洋资源与化学重点实验室项目 |
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| 摘 要： | 利用差示量热扫描仪(DSC),在288.15～328.15,K温度范围内,测定了不同浓度的甜菊糖RA40-甲醇溶液的比热,利用非线性最小二乘法建立比热与甲醇中RA40质量浓度和温度的经验方程.把该方程的计算值与实验值进行比较,相对误差平均小于1.5%.该方程可用于溶液结晶提纯RA及相关体系热量平衡的计算.
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| 关 键 词： | 差热分析 比热 二元体系 甜菊糖RA40-甲醇溶液 |
Specific Heat at Constant Pressure of Aqueous Mixtures of Steviosides RA40 with Methanol Measured with DSC |
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| MU Ying
,
WANG Xuekui
,
WANG Yanfei
,
SHA Zuoliang.Specific Heat at Constant Pressure of Aqueous Mixtures of Steviosides RA40 with Methanol Measured with DSC[J].Journal of Tianjin University of Science & Technology,2012,27(3):25-28. |
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| Authors: | MU Ying WANG Xuekui WANG Yanfei SHA Zuoliang |
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| Institution: | (Tianjin Key Laboratory of Marine Resource and Chemistry,College of Marine Science and Engineering,Tianjin University of Science & Technology,Tianjin 300457,China) |
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| Abstract: | The specific heat of the aqueous mixtures of steviosides RA40 with methanol was measured with a differential scanning calorimeter(DSC)at temperatures from 288.15,K to 328.15,K over different concentrations.The correlated equation which explained the connection between the specific heat and the concentration and temperature of RA40 in methanol was obtained with a nonlinearity least-squares regression method.The calculated values have been compared with experimental data.The percentage deviations are all lower than 1.5%.The proposed equation can be used for the crystallization in the solution to purify RA and the calculation of heat balance of relative system as well. |
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| Keywords: | DSC specific heat binary mixture aqueous mixtures of steviosides RA40 with methanol |
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