A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:
Selected papers from the latest issue:
Effect of reaction conditions on hydrothermal degradation of cornstalk lignin
20 December 2011, 01:24:54
Publication year: 2011
Source: Journal of Analytical and Applied Pyrolysis, Available online 19 December 2011
Yueyuan Ye, Juan Fan, Jie Chang
Cornstalk lignin was hydrothermally depolymerized at mild conditions in ethanol-water for producing value-added phenolics. The effects of residence time (from 30 min to 180 min), reaction temperature (from 498 K to 573 K) and concentration of ethanol (from 0%to 95% vol.) on yields of liquid products and phenolic compounds were studied in detail. The optimal conditions of 523 K, 90 min and 65% vol. ethanol-water resulted in the highest yield of liquid products (∼ 70 wt.%). The liquid products were analyzed by chromatography-mass spectrometry (GC-MS) to confirm the presence of primarily heterocycle (2,3-dihydrobenzofuran) and phenolics (such as ethylphenol, guaiacol, ethylguaiacol and syringol). Reaction conditions had significant effects on yield and composition of liquid products.
Source: Journal of Analytical and Applied Pyrolysis, Available online 19 December 2011
Yueyuan Ye, Juan Fan, Jie Chang
Cornstalk lignin was hydrothermally depolymerized at mild conditions in ethanol-water for producing value-added phenolics. The effects of residence time (from 30 min to 180 min), reaction temperature (from 498 K to 573 K) and concentration of ethanol (from 0%to 95% vol.) on yields of liquid products and phenolic compounds were studied in detail. The optimal conditions of 523 K, 90 min and 65% vol. ethanol-water resulted in the highest yield of liquid products (∼ 70 wt.%). The liquid products were analyzed by chromatography-mass spectrometry (GC-MS) to confirm the presence of primarily heterocycle (2,3-dihydrobenzofuran) and phenolics (such as ethylphenol, guaiacol, ethylguaiacol and syringol). Reaction conditions had significant effects on yield and composition of liquid products.
Highlights
► Lignin was hydrothermally depolymerized in ethanol-water at mild conditions. ► High yield of liquid products was obtained (∼ 70 wt.%). ► The liquid products were mainly composed of phenolics.Hydrothermal liquefaction of cypress: Effects of reaction conditions on 5-lump distribution and composition
20 December 2011, 01:24:54
Publication year: 2011
Source: Journal of Analytical and Applied Pyrolysis, Available online 19 December 2011
Hua-Min Liu, Xin-An Xie, Ming-Fei Li, Run-Cang Sun
Effects of reaction temperature, reaction time and water amount on the hydrothermal liquefaction of cypress, were studied in this paper. The reaction system was divided into gas lump, water-soluble oil lump, heavy oil lump, volatile organic compounds lump, and solid residue lump. Results showed that temperature was the critical parameter for 5-lump distribution in the cypress hydrothermal conversion process. The higher temperature and longer reaction time were not usually suitable for the production of bio-oil (water-soluble oil and heavy oil). The increase in the yields of gas and volatile organic compounds was also observed as temperature was increased. However, the yield of the volatile organic compounds increased first, and then decreased with the reaction time and the water amount. High amount of water led to high conversion and bio-oil yield. The FT-IR analysis of the solid residues showed that the major peaks of cypress diminished after 280 °C. The GC-MS analysis showed that the volatile organic compounds, water-soluble oil and heavy oil comprised a mixture of organic compounds of 5-7, 5-10 and 7-26 carbons, respectively, which mainly included furfural, phenol, acids, furans and their derivatives. The WSO had similar elemental compositions but the HO had a higher content of carbon and a lower concentration of oxygen as compared to cypress.
Source: Journal of Analytical and Applied Pyrolysis, Available online 19 December 2011
Hua-Min Liu, Xin-An Xie, Ming-Fei Li, Run-Cang Sun
Effects of reaction temperature, reaction time and water amount on the hydrothermal liquefaction of cypress, were studied in this paper. The reaction system was divided into gas lump, water-soluble oil lump, heavy oil lump, volatile organic compounds lump, and solid residue lump. Results showed that temperature was the critical parameter for 5-lump distribution in the cypress hydrothermal conversion process. The higher temperature and longer reaction time were not usually suitable for the production of bio-oil (water-soluble oil and heavy oil). The increase in the yields of gas and volatile organic compounds was also observed as temperature was increased. However, the yield of the volatile organic compounds increased first, and then decreased with the reaction time and the water amount. High amount of water led to high conversion and bio-oil yield. The FT-IR analysis of the solid residues showed that the major peaks of cypress diminished after 280 °C. The GC-MS analysis showed that the volatile organic compounds, water-soluble oil and heavy oil comprised a mixture of organic compounds of 5-7, 5-10 and 7-26 carbons, respectively, which mainly included furfural, phenol, acids, furans and their derivatives. The WSO had similar elemental compositions but the HO had a higher content of carbon and a lower concentration of oxygen as compared to cypress.
Highlights
► The reaction system was divided into gas lump, water-soluble oil lump, heavy oil lump, volatile organic compounds lump, and solid residue lump. ► The volatile organic compounds product was identified to be mainly composed of a mixture of furfural, 2-methoxy-phenol, 5-methyl-2-furancarboxaldehyde, and 2-methyl-2-cyclopenten-1-one. ► The yield of the volatile organic compounds increased fist, and then decreased with the resistance time and water amount.Copyrolysis of scrap tires with oily wastes
17 December 2011, 23:31:13
Publication year: 2011
Source: Journal of Analytical and Applied Pyrolysis, Available online 17 December 2011
Sermin Önenç, Mihai Brebu, Cornelia Vasile, Jale Yanik
In this study, the conversion of hazardous wastes into liquid fuels was investigated. The pyrolysis of bilge water oil and oil sludge from ships, scrap tires and their blends was carried out at 400 and 500 °C in absence and presence of catalyst. A commercial fluid catalytic cracking catalyst and Red Mud were used as catalyst. Pyrolysis products were separated as gas, oil and char. The pyrolytic oils were characterized by using Gas Chromatography-Mass Selective Detector (GC-MSD) andH nuclear magnetic resonance (H-NMR). The effect of temperature and catalyst on the product distribution and the composition of oil from pyrolysis were investigated. Co-pyrolysis of scrap tire with oily wastes from ships produced oil that could be used as fuel, while its pyrolysis alone produced oil that could be used as a chemical feedstock. The results obtained in this study showed that co-pyrolysis of oily wastes with scrap tires could be an environmentally friendly way for the transformation of hazardous wastes into valuable products such as chemicals or fuels.
Source: Journal of Analytical and Applied Pyrolysis, Available online 17 December 2011
Sermin Önenç, Mihai Brebu, Cornelia Vasile, Jale Yanik
In this study, the conversion of hazardous wastes into liquid fuels was investigated. The pyrolysis of bilge water oil and oil sludge from ships, scrap tires and their blends was carried out at 400 and 500 °C in absence and presence of catalyst. A commercial fluid catalytic cracking catalyst and Red Mud were used as catalyst. Pyrolysis products were separated as gas, oil and char. The pyrolytic oils were characterized by using Gas Chromatography-Mass Selective Detector (GC-MSD) andH nuclear magnetic resonance (H-NMR). The effect of temperature and catalyst on the product distribution and the composition of oil from pyrolysis were investigated. Co-pyrolysis of scrap tire with oily wastes from ships produced oil that could be used as fuel, while its pyrolysis alone produced oil that could be used as a chemical feedstock. The results obtained in this study showed that co-pyrolysis of oily wastes with scrap tires could be an environmentally friendly way for the transformation of hazardous wastes into valuable products such as chemicals or fuels.
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