Hydrothermal gasification of glucose and starch in a batch and continuous reactor
A batch reactor was used for the gasification of glucose and starch as carbohydrate model compounds. The effects of H2O in various states (low-pressure hot compressed water (LP-HCW, 300 °C and 10 MPa), high-pressure hot compressed water (HP-HCW, 360 °C and 20 MPa), high-temperature steam (HTS, 400 °...
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| Format: | Article |
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Elsevier
2017-11-01
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| Series: | Energy Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484716300579 |
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| author | Kazuhiro Kumabe Naoki Itoh Kohzoh Matsumoto Tatsuya Hasegawa |
| author_facet | Kazuhiro Kumabe Naoki Itoh Kohzoh Matsumoto Tatsuya Hasegawa |
| author_sort | Kazuhiro Kumabe |
| collection | DOAJ |
| description | A batch reactor was used for the gasification of glucose and starch as carbohydrate model compounds. The effects of H2O in various states (low-pressure hot compressed water (LP-HCW, 300 °C and 10 MPa), high-pressure hot compressed water (HP-HCW, 360 °C and 20 MPa), high-temperature steam (HTS, 400 °C and 10 MPa), and supercritical water (SCW, 400 °C and 25 MPa)), as well as reaction time (10, 30, and 60 min), sample concentration (10, 20, and 30 wt%), and catalyst (mixture of Ca(OH)2 and Na2CO3) on gas production were investigated in the hydrothermal gasification. In addition, using a continuous reactor, the hydrothermal gasification of glucose was examined with LP-HCW (200 °C and 5 MPa), HP-HCW (200 °C and 25 MPa), HTS (600 °C, 5 MPa), and SCW (600 °C, 25 MPa) in order to study the productions of gases and tar, and the mass balance. The reaction temperature affected gasification considerably, but pressure had little effect. In the batch experiments, the characteristics of the produced gases were almost identical after a reaction time of 10 min, and addition of Ca(OH)2 and Na2CO3 as catalysts in a molar ratio of 7:3 led to selective production of H2 in the SCW gasification of 10 wt% glucose for 30 min. In a continuous experiment under the SCW conditions, the conversion efficiency of glucose to gas was 26% and the composition of the produced gas was 29 vol% CO, 23 vol% H2, and 16 vol% CH4. Under the hydrothermal conditions, glucose was mainly converted to char and suspended components of high-molecular-weight compounds such as fat, whereas starch was mainly converted to gas and liquid. |
| first_indexed | 2024-04-13T14:03:41Z |
| format | Article |
| id | doaj.art-d037476df76048d0a2f76c5b7e8fade6 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-04-13T14:03:41Z |
| publishDate | 2017-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-d037476df76048d0a2f76c5b7e8fade62022-12-22T02:43:58ZengElsevierEnergy Reports2352-48472017-11-013C707510.1016/j.egyr.2017.04.001Hydrothermal gasification of glucose and starch in a batch and continuous reactorKazuhiro Kumabe0Naoki Itoh1Kohzoh Matsumoto2Tatsuya Hasegawa3Division of Environmental and Renewable Energy Systems (ERES), Graduate School of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, JapanDepartment of Aerospace Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanInstitute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanDepartment of Aerospace Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanA batch reactor was used for the gasification of glucose and starch as carbohydrate model compounds. The effects of H2O in various states (low-pressure hot compressed water (LP-HCW, 300 °C and 10 MPa), high-pressure hot compressed water (HP-HCW, 360 °C and 20 MPa), high-temperature steam (HTS, 400 °C and 10 MPa), and supercritical water (SCW, 400 °C and 25 MPa)), as well as reaction time (10, 30, and 60 min), sample concentration (10, 20, and 30 wt%), and catalyst (mixture of Ca(OH)2 and Na2CO3) on gas production were investigated in the hydrothermal gasification. In addition, using a continuous reactor, the hydrothermal gasification of glucose was examined with LP-HCW (200 °C and 5 MPa), HP-HCW (200 °C and 25 MPa), HTS (600 °C, 5 MPa), and SCW (600 °C, 25 MPa) in order to study the productions of gases and tar, and the mass balance. The reaction temperature affected gasification considerably, but pressure had little effect. In the batch experiments, the characteristics of the produced gases were almost identical after a reaction time of 10 min, and addition of Ca(OH)2 and Na2CO3 as catalysts in a molar ratio of 7:3 led to selective production of H2 in the SCW gasification of 10 wt% glucose for 30 min. In a continuous experiment under the SCW conditions, the conversion efficiency of glucose to gas was 26% and the composition of the produced gas was 29 vol% CO, 23 vol% H2, and 16 vol% CH4. Under the hydrothermal conditions, glucose was mainly converted to char and suspended components of high-molecular-weight compounds such as fat, whereas starch was mainly converted to gas and liquid.http://www.sciencedirect.com/science/article/pii/S2352484716300579Hydrothermal gasificationGlucoseStarchBatch reactorContinuous reactor |
| spellingShingle | Kazuhiro Kumabe Naoki Itoh Kohzoh Matsumoto Tatsuya Hasegawa Hydrothermal gasification of glucose and starch in a batch and continuous reactor Energy Reports Hydrothermal gasification Glucose Starch Batch reactor Continuous reactor |
| title | Hydrothermal gasification of glucose and starch in a batch and continuous reactor |
| title_full | Hydrothermal gasification of glucose and starch in a batch and continuous reactor |
| title_fullStr | Hydrothermal gasification of glucose and starch in a batch and continuous reactor |
| title_full_unstemmed | Hydrothermal gasification of glucose and starch in a batch and continuous reactor |
| title_short | Hydrothermal gasification of glucose and starch in a batch and continuous reactor |
| title_sort | hydrothermal gasification of glucose and starch in a batch and continuous reactor |
| topic | Hydrothermal gasification Glucose Starch Batch reactor Continuous reactor |
| url | http://www.sciencedirect.com/science/article/pii/S2352484716300579 |
| work_keys_str_mv | AT kazuhirokumabe hydrothermalgasificationofglucoseandstarchinabatchandcontinuousreactor AT naokiitoh hydrothermalgasificationofglucoseandstarchinabatchandcontinuousreactor AT kohzohmatsumoto hydrothermalgasificationofglucoseandstarchinabatchandcontinuousreactor AT tatsuyahasegawa hydrothermalgasificationofglucoseandstarchinabatchandcontinuousreactor |