Investigation on the Lignin Removal From Tobacco Stem by a Solvothermal Method Using Ethylene Glycol as a Solvent
, , , , y | 15 ago 2022
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Publicado en línea: 15 ago 2022
Páginas: 106 - 111
Recibido: 12 jul 2021
Aceptado: 14 abr 2022
DOI: https://doi.org/10.2478/cttr-2022-0011
© 2022 Zhihao Chen et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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Specific surface area and pore volume of tobacco stem before and after treatment with solanesol and ethylene glycol.
| Material | S |
Pore volume (cm3 g−1) |
|---|---|---|
| Fresh tobacco stem | 0.8047 | 0.0004 |
| Treated tobacco stem | 3.2843 | 0.0038 |
Chemicals and materials used in this work.
| Chemicals | Purities | Manufacturer |
|---|---|---|
| Ethylene glycol | A.R. | Macklin Company |
| A.R. | Tianjin Fuyu Company | |
| Nicotine | 98% | USP Company |
| Solanesol | 95% | Aladdin Company |
| H2SO4 | A.R. | LuoYang Haohua Company |
| N2 | 99.999% | Bejing Praxair Company |
| Tobacco stem | – | China Tobacco Hunan Ind. Co. |
| Wheat straw | – | Henan, China |
| Corncob | – | Henan, China |
Lignin content of wheat straw, corncob and tobacco stem before and after ethylene glycol treatment.
| Material | Lignin content (wt/wt) Before treatment | Lignin content (wt/wt) After treatment |
|---|---|---|
| Wheat straw | 18.50 | 11.23 |
| Corncob | 14.15 | 7.91 |
| Tobacco stem | 5.15 | 4.44 |
Solanesol content of tobacco stem before and after n-hexane treatment.
| Material | Solanesol content (wt/wt) Before treatment | Solanesol content (wt/wt) After treatment |
|---|---|---|
| Tobacco stem | 0.18 | 0 |
Assignment of absorbance bands in FT-IR spectra.
| Wavenumber (cm−1) | Vibration | Assignment |
|---|---|---|
| 3405 | O–H | Phenolic OH + aliphatic OH |
| 2931 | C–H | CH3 + CH2 |
| 1737 | C=O | Unconjugated C=O |
| 1626 | C–C | Aromatic skeleton |
| 1515 | C–C | Aromatic skeleton |
| 1428 | C–C | Aromatic skeleton |
| 1322 | C–O | Syringyl unit of lignin |
| 1248 | C–O | Guaiacyl unit of lignin |
| 1063 | C–OH + C–O–C | Aliphatic OH + ether |