| 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]. 天津轻工业学院学报, 2012, 0(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（20080416）;天津市海洋资源与化学重点实验室项目（200902） |
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| 摘 要： | 利用差示量热扫描仪（DSC）,在288．15-328．15K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 Light Industry, 2012, 0(3): 25-28 |
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| Authors: | MU Ying WANG Xuekui WANG Yanfei SHA Zuoliang |
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| Affiliation: | (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 solu- tion 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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