Automated Measurement of Liquid-liquid Equilibria using Raman Spectroscopy and Single Droplet Tracking in Microfluidic Plug Flow

Kasterke, Marvin; Thien, Julia; Flake, Carsten; Brands, Thorsten; Bahr, Leo Alexander; Bardow, André; Koß, Hans-Jürgen

doi:10.1016/j.fluid.2022.113718

Cited by 2 publications

(1 citation statement)

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“…Other microfluidic setups using Raman spectroscopy were recently used by Liebergesell et al, 16 Liu et al, 17 or Wang et al 18 for the determination of VLE respectively solubility data, as well as by Kasterke et al 19 for measurements of liquid− liquid equilibria (LLE).…”

Section: Introductionmentioning

confidence: 99%

Vapor–Liquid Equilibria of Binary Systems Consisting of Nitrogen and n-Tridecane, n-Pentadecane, n-Hexadecane, and n-Heptadecane at Pressures of 1.5–9 MPa and Temperatures of 303–633 K─Determined with a Raman Spectroscopy-Coupled Microfluidic Device

Fechter

Braeuer

2023

J. Chem. Eng. Data

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Vapor–liquid equilibria (VLE) of binary systems consisting of nitrogen and an n-alkane (n-tridecane, n-pentadecane, n-hexadecane, or n-heptadecane) were measured at a temperature range of T = 303–633 K and pressure range of p = 1.5–9 MPa. A microcapillary setup was employed, which was coupled with an in situ Raman spectroscopy unit. Calibration was performed inside the unsaturated vapor and liquid phase regime in order to link the Raman signal ratios of the saturated vapor and liquid phase spectra to mole fractions. Regarding the Raman evaluation of the saturated vapor phase spectra, a signal contribution from a liquid film can be successfully corrected by an indirect hard modeling (IHM) approach. The obtained experimental data of the binary system n-hexadecane/nitrogen were validated with the available literature data, where good agreement was found. By comparing the saturated compositions between the different binary systems, only small differences could be observed for the saturated liquid phase, while the compositions of the saturated vapor phase clearly deviated from each other. Moreover, the experimental results of all binary systems were compared with the calculated data obtained from different models: the predictive Peng-Robinson equation of state (PPR78) and the perturbed-chain statistical associating fluid theory (PC-SAFT). The data can be well described by the models, with the absolute average deviation (AAD) that is generally higher for the saturated vapor phase compared with the saturated liquid phase.

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