Feasibility of monitoring acetic acid process using near-infrared spectroscopy |
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| Affiliation: | 1. Department of Chemistry, College of Natural Sciences, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul 133-791, South Korea;2. NIR Business Team, SK Corporation, 110 Nam-Gu, Kosa-Dong, Ulsan, South Korea;1. Uzhhorod National University, 46 Pidhirna Str., 88000, Uzhhorod, Ukraine;2. Vlokh Institute of Physical Optics, 23 Dragomanov Str., 79005, Lviv, Ukraine;3. Semiconductor Physics, Chemnitz University of Technology, D-09107, Chemnitz, Germany;4. Institute of Electron Physics, Ukr. Nat. Acad. Sci., 21 Universytetska Str., 88017, Uzhhorod, Ukraine;1. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland;2. Frank Laboratory of Neutron Physics, JINR, 141980 Dubna, Russia |
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| Abstract: | Near-infrared (NIR) spectroscopy has been utilized to demonstrate its feasibility for the measurement of major components in the acetic acid process. In order to simulate the acetic acid process, synthetic mixtures were prepared from five different components: acetic acid, methyl acetate, methyl iodide, water, and potassium iodide. Partial least squares (PLS) regression was utilized to differentiate the spectral characteristics as well as to quantify each component for the mixtures. The spectral features of acetic acid, methyl acetate, methyl iodide, and water are noticeably different with each other over the entire NIR region. The quantity of iodide ion, which does not absorb NIR radiation, was determined using the wavelength shift and intensity change of water absorption band caused by the change of iodide ion concentration. The PLS calibration results of the five components show good correlation with reference data. They also demonstrate the technical feasibility of NIR spectroscopy for monitoring important components in the acetic acid process. |
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