UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments
Lignocellulosic agricultural side products like wheat straw are widely seen as an important contribution to a sustainable future economy. However, the optimization of biorefinery processes, especially the pretreatment step, is crucial for an economically viable biorefinery. The monitoring of this pr...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-09-01
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| Series: | ChemEngineering |
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| Online Access: | http://www.mdpi.com/2305-7084/2/4/45 |
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| author | Stefan Beisl Mathias Binder Kurt Varmuza Angela Miltner Anton Friedl |
| author_facet | Stefan Beisl Mathias Binder Kurt Varmuza Angela Miltner Anton Friedl |
| author_sort | Stefan Beisl |
| collection | DOAJ |
| description | Lignocellulosic agricultural side products like wheat straw are widely seen as an important contribution to a sustainable future economy. However, the optimization of biorefinery processes, especially the pretreatment step, is crucial for an economically viable biorefinery. The monitoring of this pretreatment process in terms of delignification and the generation of the fermentation inhibitors acetic acid, furfural, and hydroxymethylfurfural (HMF) is essential in order to adapt the process parameters for a desired outcome and an economical operation. However, traditional wet chemistry methods are time-consuming and not suitable for on-line process monitoring. Therefore, UV-Vis spectroscopy in combination with partial least-squares regression was used for the determination of the concentrations of lignin, acetic acid, furfural, and HMF. Five different data blocks with increasing amounts of impurities were investigated to evaluate the influence of the inevitable impurities on the calibration models. Lignin showed a good prediction accuracy with 95% tolerance intervals between ±0.46 to ±1.6 mg/L for concentrations up to 30 mg/L. Also, the other components could be predicted with a sufficient accuracy for on-line process monitoring. A satisfactory calibration can be obtained with 10 to 20 reference samples valid at process temperatures between 160 °C and 180 °C. |
| first_indexed | 2024-04-13T02:22:50Z |
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| id | doaj.art-34a934147aa3464c956179f4cbf5b37d |
| institution | Directory Open Access Journal |
| issn | 2305-7084 |
| language | English |
| last_indexed | 2024-04-13T02:22:50Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | ChemEngineering |
| spelling | doaj.art-34a934147aa3464c956179f4cbf5b37d2022-12-22T03:06:52ZengMDPI AGChemEngineering2305-70842018-09-01244510.3390/chemengineering2040045chemengineering2040045UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv PretreatmentsStefan Beisl0Mathias Binder1Kurt Varmuza2Angela Miltner3Anton Friedl4Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, AustriaInstitute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, AustriaInstitute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, AustriaInstitute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, AustriaInstitute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, AustriaLignocellulosic agricultural side products like wheat straw are widely seen as an important contribution to a sustainable future economy. However, the optimization of biorefinery processes, especially the pretreatment step, is crucial for an economically viable biorefinery. The monitoring of this pretreatment process in terms of delignification and the generation of the fermentation inhibitors acetic acid, furfural, and hydroxymethylfurfural (HMF) is essential in order to adapt the process parameters for a desired outcome and an economical operation. However, traditional wet chemistry methods are time-consuming and not suitable for on-line process monitoring. Therefore, UV-Vis spectroscopy in combination with partial least-squares regression was used for the determination of the concentrations of lignin, acetic acid, furfural, and HMF. Five different data blocks with increasing amounts of impurities were investigated to evaluate the influence of the inevitable impurities on the calibration models. Lignin showed a good prediction accuracy with 95% tolerance intervals between ±0.46 to ±1.6 mg/L for concentrations up to 30 mg/L. Also, the other components could be predicted with a sufficient accuracy for on-line process monitoring. A satisfactory calibration can be obtained with 10 to 20 reference samples valid at process temperatures between 160 °C and 180 °C.http://www.mdpi.com/2305-7084/2/4/45UV-Visspectroscopypartial least-squares, biorefinerylignocelluloseligninon-lineanalyticschemometricsorganosolvinhibitorshydroxymethylfurfuralfurfuralacetic acid |
| spellingShingle | Stefan Beisl Mathias Binder Kurt Varmuza Angela Miltner Anton Friedl UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments ChemEngineering UV-Vis spectroscopy partial least-squares, biorefinery lignocellulose lignin on-line analytics chemometrics organosolv inhibitors hydroxymethylfurfural furfural acetic acid |
| title | UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments |
| title_full | UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments |
| title_fullStr | UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments |
| title_full_unstemmed | UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments |
| title_short | UV-Vis Spectroscopy and Chemometrics for the Monitoring of Organosolv Pretreatments |
| title_sort | uv vis spectroscopy and chemometrics for the monitoring of organosolv pretreatments |
| topic | UV-Vis spectroscopy partial least-squares, biorefinery lignocellulose lignin on-line analytics chemometrics organosolv inhibitors hydroxymethylfurfural furfural acetic acid |
| url | http://www.mdpi.com/2305-7084/2/4/45 |
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