Precise measurements of properties of aqueous methanol mixtures and discussion on their composition dependence

甲醇水溶液混合物性质的精确测量及其成分依赖性的讨论

• 批准号: 10650223
• 负责人: UEMATSU Masahiko
• 金额: $ 2.18万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650223/
• 关键词: Methanol; Aqueous methanol mixture; PVT properties; Bubble point pressure; Saturated liquid density; Non-ideality; Excess molar volume; Properties at high pressures

Recently methanol and its aqueous mixtures have attracted much attention due to their potentiality in use as recovery and fixation for COィイD22ィエD2 being one of greenhouse gases, and as transport and storage of hydrogen fuel. Renewed interest in these materials shows also to other various applications such as natural refrigerants, and working fluids in new power cycles. Thermophysical property data for these materials are fundamental information to industrialize these new and renewed applications.In the present study, bubble point pressures, saturated liquid densities and PVT properties of {xCHィイD23ィエD2OH+(1-x)HィイD22ィエD2O} with x=(1.0000 and 0.1984) have been measured by a variable volume method with metal bellows in the temperature range from 320 K to 400 K at pressures up to 200 Mpa. The uncertainties in measurements are estimated no greater than 3 mK in temperature, and 0.1% in pressure, density and composition, respectively. By the aid of these measurements, isothermal compressibility, isobaric expansivity, and non-ideality in bubble point pressures as well as PVT properties have been calculated.The study concluded with followings:(1) Deviations of bubble point pressure from Raoult's law show positive. The deviations of mixture with 20 mol% methanol decrease with increasing temperature, whereas those with 50 mol% methanol are constant with variation of temperature.(2) Excess molar volumes show negative, and approach zero being the behavior of ideal mixtures with increasing pressure. As for temperature dependence of the mixtures, behavior of those with 50 mol% methanol changes at a pressure of about 20 Mpa, but no such behavior is observed for the mixture with 20 mol% methanol.

近年来，甲醇及其水溶液混合物由于其在回收和固定温室气体之一的CO2-D22-D2以及作为氢燃料的运输和储存方面的潜力而引起了人们的广泛关注。对这些材料的重新兴趣也显示出其他各种应用，如天然制冷剂和新动力循环中的工作流体。这些材料的热物理性能数据是工业化这些新的和更新的应用的基本信息。饱和液体密度和{xCH D23 D2 OH+（1-x）H D22 D2 O}的PVT性质，其中x=（1.0000和0.1984）已被测量的可变体积的方法与金属波纹管的温度范围从320至400 K和压力高达200 Mpa。测量的不确定度估计不超过3 mK的温度，和0.1%的压力，密度和成分，分别。利用这些测量数据，计算了等温压缩系数、等压膨胀系数、泡点压力的非理想性以及PVT性质，研究结果表明：（1）泡点压力与拉乌尔定律的偏差为正。含20mol%甲醇的混合物的偏差随温度的升高而减小，而含50mol%甲醇的混合物的偏差随温度的变化是恒定的。(2)过量摩尔体积显示为负，并且接近零是理想混合物随着压力增加的行为。关于混合物的温度依赖性，具有50摩尔%甲醇的混合物的行为在约20 Mpa的压力下改变，但是对于具有20摩尔%甲醇的混合物没有观察到这种行为。

项目成果

河野通高: "メタノール水溶液の熱力学性質の測定"第40回高圧討論会講演要旨集. 109 (1999)

Michitaka Kono：“甲醇水溶液热力学性质的测量”第 40 届高压研讨会摘要 109（1999 年）。

M.Sato: "Measurements of Thermodynamic Properties of Aqueous Methanol Mixtures" Proceedings of the 5th Asian Thermophysical Properties Conference. 1. 5-8 (1998)

M.Sato：“含水甲醇混合物热力学性质的测量”第五届亚洲热物理性质会议论文集。

O. Osada: "Excess Molar Volumes of (xCH_3OH+(1-x)H_2O) in the Temperature Range from 320 K to 420 K at Pressure up to 200 MPa"15th International Conference on Chemical Thermodynamics. (1998)

O. Osada：“在压力高达 200 MPa 的压力下，在 320 K 至 420 K 的温度范围内 (xCH_3OH (1-x)H_2O) 的过量摩尔体积”第 15 届国际化学热力学会议。

O. Osada: "Excess Molar Volumes of {xCHィイD23ィエD2OH+(1-x)HィイD22ィエD2O} in the Temperature Range from 320 K to 420 K at Pressures up to 200 Mpa"15th International Conference on Chemical Thermodynamics. C1-16. (1998)

O. Osada：“在 320 K 至 420 K 的温度范围内，压力高达 200 Mpa 时 {xCHD23D2OH+(1-x)H22D2O} 的过量摩尔体积”第 15 届国际化学热力学会议 (1998)。

M. Sato: "Measurements of Thermodynamic Properties of Aqueous Methanol Mixtures"Proceedings of the 5th Asian Thermophysical Properties Conference. 1. 5-8 (1998)

M. Sato：“含水甲醇混合物热力学性质的测量”第五届亚洲热物理性质会议论文集。