Vapour pressures of isobutane at T = (310 to 407) K
Vapour pressures of isobutane at T = (310 to 407) K
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DOI：
10.1016/j.jct.2004.06.012
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发表时间：
2004-10-01
影响因子：
2.6
通讯作者：
Uematsu, M
中科院分区：
文献类型：
--
作者：
Miyamoto, H;Takemura, J;Uematsu, M
用金属波纹管可变容积计在310 ~ 407 K温度范围内测定了28个异丁烷的蒸气压。通过测量使用的异丁烷的体积分数纯度为0.9999。温度和压力测量的扩展不确定度（k = 2）估计分别小于4 mK和+/-1.1 kPa。在相同温度下对波纹管的各种体积的当前测量的一致性几乎在+/-0.2 kPa的绝对平均偏差内。两个系列的测量，其中样品填充物和所采用的铂电阻温度计不同，也被证实是足够低的实验不确定度。在本研究中，蒸汽压测量在相同的温度下，从文献中的几个点的数据进行了直接比较，以定量评估目前的可靠性。此外，基于当前测量值作为输入数据，提供了瓦格纳型蒸汽压相关性，该相关性也用于当前测量值与文献数据之间的系统比较。(C)2004 Elsevier Ltd.保留所有权利。
Twenty-eight measurements of the vapour pressure for isobutane have been obtained by means of a metal-bellows variable volumometer at temperatures from 310 K to 407 K. The volume-fraction purity of isobutane used through the measurement was 0.9999. The expanded uncertainties (k = 2) in temperature and pressure measurements have been estimated to be less than 4 mK and +/-1.1 kPa, respectively. The agreement of the present measurements on various volumes of the bellows at the same temperature is almost within the absolute average deviations of +/-0.2 kPa. The discrepancies between two series of the present measurement, in which the sample fillings and adopted platinum resistance thermometers are different, have also been confirmed as enough lower than the experimental uncertainty. Throughout the present study, the direct comparisons of the vapour-pressure measurements on the same temperatures with several points data from the literatures were made in order to assess the reliability of the present ones quantitatively. In addition, based on the present measurements as input data, the Wagner-type vapour-pressure correlation was provided, which was also used for the systematic comparisons between the present measurement and the literature data. (C) 2004 Elsevier Ltd. All rights reserved.