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J. Chem. Eng. Data 2002, 47, 1314-1319
Liquid Densities and Excess Volumes of Diisopropyl Ether (DIPE) + 1-Butanol Mixtures from 273 to 473 K and Pressures up to 35 MPa E. Christian Ihmels and Ju 1 rgen Gmehling* Carl von Ossietzky University of Oldenburg, Department of Industrial Chemistry, P.O. Box 2503, D-26111 Oldenburg, Germany
Densities of five gravimetrically prepared diisopropyl ether + 1-butanol mixtures in the liquid state at different compositions have been measured with a computer-controlled high-temperature high-pressure vibrating tube densimeter system (DMA-HDT). The uncertainty in the density measurement was estimated to be lower than (0.2 kg‚m-3. The densities were measured for temperatures from 273 K to 473 K and pressures up to 35 MPa (∼320 data points for each mixture), which covered a density range between (518 and 830) kg‚m-3 and an excess volume range between (-0.02 and -5) cm3‚mol-1. Densities of 1-butanol were also measured in the same temperature and pressure ranges. The experimental data were correlated with the new three-dimensional density correlation system (TRIDEN); excess volumes were calculated using the densities already published for diisopropyl ether. The excess volumes and the densities of 1-butanol are compared with published data.
Introduction For the density measurements as a function of temperature and pressure, a computer-controlled high-temperature high-pressure vibrating tube densimeter system (DMAHDT) was developed.1-3 Densities for several pure components for the compressed liquid and the supercritical states have already been published.1-5 In this work the densities of diisopropyl ether + 1-butanol mixtures were measured with the objective to check the accuracy of the experimental technique for the reliable determination of excess volumes. For this purpose densities of five gravimetrically prepared diisopropyl ether (1) + 1-butanol (2) mixtures with x1 ) 0.2001, 0.3508, 0.5001, 0.6503, and 0.8000 have been investigated. The densities were measured for temperatures from 273 K to 473 K and pressures up to 35 MPa (∼320 data points for each mixture). Additionally, the required pure component densities of 1-butanol were measured. The required densities of DIPE have already been published.5 The experimental data were correlated with the new three-dimensional density correlation system (TRIDEN); excess volumes were calculated, and the results were compared with published data. Details of the measurement system, the calibration, and the correlation model can be found in refs 1 and 2. Experimental Section Diisopropyl ether (DIPE, C6H14O, M ) 102.18 g‚mol-1, CAS-RN 108-20-3) and 1-butanol (C4H10O, M ) 74.12 g‚mol-1, CAS-RN 71-36-3) were both obtained from Aldrich. All compounds were stored over 3 Å molecular sieves and degassed by distillation. The final purities were checked by gas chromatography (DIPE and 1-butanol: >99.8 mass %) and by Karl Fischer titration (water content of DIPE:
