Experimental density-composition data and thermal expansion coefficient of HI-I-2-H2O solution
Experimental density-composition data and thermal expansion coefficient of HI-I-2-H2O solution
复制标题
HI-I2-H2O溶液的实验密度-成分数据和热膨胀系数
DOI：
10.1016/j.ijhydene.2018.01.025
复制
发表时间：
2018
影响因子：
7.2
通讯作者：
Xu Jingming
中科院分区：
文献类型：
--
作者：
Chen Songzhe;Zhang Ping;Wang Laijun;Xu Jingming
在热化学水裂解碘-硫制氢循环中，HI-H_2 O-I_2（HIx）溶液的基本物理化学数据非常重要。因此，对密度/热膨胀系数（CTE）的详细和系统的研究是非常必要的。在这项工作中，在大气压和20至90 °C的温度范围内测量了53个具有不同组成的HIx样品的密度值。当HI或I2含量变化时，HIx溶液的密度变化很大。增加HI或I2浓度将导致密度增加。当加热时，HIx的密度由于热膨胀而降低。借助于密度-温度曲线，计算了不同组成的HIx溶液的CTE值。结果表明，无论是I2/HI还是H2O/HI的增加，都会导致HIx的热膨胀系数增加。虽然CTE值相对较小，但它对成分的变化非常敏感。在此工作范围内，HIx的CTE值在5.45E-4/ºC至9.17E-4/ºC之间变化。进行多项式回归以模拟CTE与组成之间的关系。所得到的近似二次多项式模型具有很好的精度，可以重现大多数实验CTE值，偏差在± 5%以内。
In thermochemical water-splitting iodine-sulfur cycle for hydrogen production, basic physico-chemical data of HI-H2O-I2(HIx) solution are very important. Detailed and systematic studies on density/coefficient of thermal expansion (CTE) are in great need. In this work, the density values of 53 HIx samples with different compositions are measured at atmospheric pressure and temperatures ranging from 20 to 90 °C. HIx solution's density varies dramatically when changing HI or I2contents. Increasing either HI or I2concentration will cause increase of density. When heated, HIx's density decreases because of thermal expansion. With the help of density-temperature curves, the CTE values are calculated for HIx solutions of different compositions. It is found that increase of either I2/HI or H2O/HI will bring rise of HIx's CTE. Although the CTE value is relatively small, it is very sensitive to the change of composition. In the range of this work, the HIx's CTE value changes within 5.45E-4/ºC to 9.17E-4/ºC. Polynomial regression is conducted to model the relationship between CTE and the composition. The obtained approximate quadratic polynomial model has good accuracy to reproduce most of the experimental CTE values within a deviation of ±5%.