Compressed Liquid Densities and Saturated Liquid Densities of Dimethyl Ether (RE170)

Dimethyl ether (RE170) is a very important chemical compound, largely employed in the chemical industry,
but the available literature data for this fluid, especially in terms of liquid density, are scarce. In this
paper, compressed liquid density data were measured along eight isotherms between (283.15 and 353.15)
K up to 35 MPa with a vibrating tube densimeter (Anton Paar DMA 512) and, on the basis of these data,
the saturated liquid densities were estimated. The overall estimated uncertainty for the density data is
within ± 0.1 %. The experimental compressed liquid density data and the estimated saturated density
data were correlated by means of fitting equations that are also presented in this paper.

二甲醚（Dimethyl ether，RE170）是一类极为重要的化工化合物，广泛应用于化工产业，但目前针对该流体的现有文献数据较为匮乏，尤以液体密度相关数据为突出。本文采用振动管密度计（Anton Paar DMA 512），在283.15 K至353.15 K的8条等温线、最高35 MPa的压力范围内，测定了该流体的压缩液体密度数据，并基于上述实验数据估算了其饱和液体密度。本次密度数据的整体估算不确定度不超过±0.1%。本文同时给出了拟合方程，用于关联本研究获得的实验压缩液体密度数据与估算得到的饱和密度数据。