Lingyan Gui, Jian Yang*, Jiangtao Wu and Xianyang Meng,
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引用次数: 0
摘要
甲醇是世界公认的可再生、环保、高效的低碳生物燃料,可广泛应用于各个领域。基于该研究开发的新型高温高压流动量热仪,可在温度 T = 298-573 K 和压力高达 15 MPa 的条件下测量流体的等压热容。流体热量计的热损失由不同温度下的正庚烷校准。在温度 T 为 298 至 573 K、压力 p 为 0.1 至 15 MPa 的液相和气相条件下,测量了甲醇的等压比热容 cp。实验数据与亥姆霍兹状态方程(EoS)进行了比较,结果表明液相和气相的平均绝对偏差(AAD)分别为 0.32% 和 0.80%。我们提出了一种新的热容量与温度和压力的相关关系,并用它来拟合甲醇在液相和气相中的实验数据,结果表明其性能优于其他模型。在新模型的基础上,我们的数据与已公布的实验数据进行了比较,大多数数据都与我们的相关性吻合。
Isobaric Heat Capacity Measurements of Methanol by Flow Calorimeter at Elevated Temperatures and Pressures
Methanol is the world’s recognized renewable, environmentally friendly, efficient low-carbon biofuel and can be widely used in various fields. Based on the new high temperature and pressure flow calorimeter developed in this work, the isobaric heat capacity of fluids can be measured at temperatures T = 298–573 K and pressures up to 15 MPa. The heat loss of the flow calorimeter was calibrated by n-heptane at various temperatures. The isobaric specific heat capacity cp of methanol was measured for temperatures T ranging from 298 to 573 K and pressures p ranging from 0.1 to 15 MPa in both liquid and vapor phases. The experimental data were compared and agreed well with the Helmholtz equation of state (EoS), indicating the average absolute deviation (AAD) of 0.32% and 0.80% for liquid and vapor phases, respectively. A new correlation of heat capacity with temperature and pressure was proposed and used to fit the experimental data of methanol both in liquid and vapor phases, which showed better performance than other models. Based on the new model, our data were able to compare with the available published experimental data, and most data agreed well with our correlation.
期刊介绍:
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.