Elsevier

Thermochimica Acta

Volume 592, 20 September 2014, Pages 73-85
Thermochimica Acta

Measurements of the density and viscosity of 1-hexene + 1-octene mixtures at high temperatures and high pressures

https://doi.org/10.1016/j.tca.2014.08.016Get rights and content

Highlights

Abstract

The density and viscosity of binary 1-hexene + 1-octene mixtures have been simultaneously measured over the temperature range from (298 to 470) K and at pressures up to 196 MPa using a hydrostatic weighing and falling-body techniques, respectively. The measurements were made for three concentrations of 0.200, 0.429, and 0.692 mole fraction of 1-octene. The combined expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.15–0.30) %, 0.05%, 0.02 K, and (1.5–2.0) %, respectively, depending on temperature and pressure ranges. The measured densities and viscosities were used to calculate the excess molar volumes and viscosity differences. It is shown that the values of excess molar volume for 1-hexene + 1-octene mixtures are negative, while the viscosity differences are mostly positive at all measured temperatures and pressures over the whole concentration range. The measured densities and viscosities were also used to develop a Tait-type equation of state and viscosity correlation model for liquid 1-hexene + 1-octene mixtures. Theoretically based Arrhenius-Andrade and Grunberg and Nisan type equations were used to represent the temperature and concentration dependences of the measured viscosities for liquid 1-hexene + 1-octene binary mixtures at atmospheric pressure.

Introduction

A new improved experimental apparatus [1] for simultaneous measurements of the density and viscosity of liquids and liquid mixtures at high temperatures (from room temperature to 500 K) and at high pressures (up to 250 MPa) was used to accurately measure of the density and viscosity of binary 1-hexene + 1octene mixtures. The method is based on hydrostatic weighing and falling-body techniques. Both techniques were combined into the same measuring cell. The construction of the measuring cell, procedure of measurements, and the uncertainty analyses has been detailed described in our previous publication [1]. In our other publications [2], [3], [4], [5], [6] the method and apparatus were successfully used for accurate measurements of the density and viscosity of n-heptane, monoethylene glycol (MEG), diethylene glycol (DEG), triethylene glycol (TEG), and their binary (50% MEG + 50% DEG, 50% MEG + 50% TEG, 50% DEG + 50% TEG), and ternary (33.33% MEG + 33.33% DEG + 33.34% TEG), and 1-hexene + 1-decene mixtures at temperatures from (293 to 473) K and at pressures up to 245 MPa. In this work we used the same apparatus to measure the density and viscosity of binary 1-hexene + 1-octene mixtures at high temperatures from (298 to 470) K and at high pressures (up to 196 MPa).

A survey of the literature reveals that there are no measurements of the density and viscosity of binary 1-hexene + 1-decene mixtures. The literature search was based on the TRC/NIST archive [7]. Thus, the main objective of the present work is to provide new sets of accurate experimental density and viscosity data for binary 1-hexene + 1-octene mixtures over a wide range of temperature and high pressure for 1-hexene + 1-octene mixtures. Pure component (1-hexene and 1-octene) data of the mixture has been reported previously in our recent publications [4], [5]. Another objective of the present study is to develop Tait-type equation of state (EOS) and viscosity correlation model for liquid binary 1-hexene + 1-octene mixture. This work is a part of a continuing program on the thermodynamic and transport properties of unsaturated hydrocarbons at high temperatures and high pressures.

Section snippets

Experimental

The details of the high-temperature and high-pressure apparatus and procedures (the physical basis and theory of the method and the uncertainty assessment) used for the present density and viscosity measurements have been described in our previous publication [1] and were used without modification. Since the method has been described fully in [1], it will be not necessary to give here the details bearing on the present experiments. Brief information will be given below. The method is based on

Density

Measurements of the density of 1-hexene + 1-octene mixtures as a function of temperature, pressure, and concentration were performed at three concentrations (0.200, 0.429, and 0.692 mole fraction of 1-octene) for temperatures from (298 to 470) K. The pressure ranged from (0.098 to 196) MPa. The pure component (1-hexene and 1-octene) densities and viscosities were reported in our previous publications [4], [5] using the same technique. The experimental results are presented in Table 2. Some selected

Conclusions

The density and viscosity of liquid binary mixtures 1-hexene + 1-octene have been simultaneously measured over the temperature range from (298 to 470) K and at pressures up to 196 MPa using the hydrostatic weighing and falling-body techniques. The measurements were performed along five isobars (0.098, 24.51, 49.03, 98.06, and 196.13) MPa as a function of temperature for three compositions of (0.200, 0.429, and 0.692) mole fraction of 1-octene. The derived values of excess molar volume for 1-hexene + 

Acknowledgment

I.M. Abdulagatov thanks the Applied Chemicals and Materials Division at the National Institute of Standards and Technology for the opportunity to work as a Guest Researcher at NIST during the course of this research.

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