Anhui Province Key Laboratory of Biomass Clean Energy

Hefei, China

Anhui Province Key Laboratory of Biomass Clean Energy

Hefei, China

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Zhou L.,Key Laboratory of Coal Processing and Efficient Utilization | Zong Z.-M.,Key Laboratory of Coal Processing and Efficient Utilization | Tang S.-R.,Key Laboratory of Coal Processing and Efficient Utilization | Zong Y.,Key Laboratory of Coal Processing and Efficient Utilization | And 8 more authors.
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2010

Bio-oil prepared from flash pyrolysis of rice stalk around 500C was upgraded by filtration and catalytic esterification. Both raw and upgraded bio-oils were observed with an optical microscope. The upgraded bio-oil was extracted with benzene, carbon disulfide, hexane, and carbon tetrachloride, respectively, and the soluble fractions were analyzed with FTIR and GC/MS. In addition, ion trap mass spectrometer was used for analysis of the benzene-soluble fraction. The results show that the upgrading substantially improved the dispersity of organic droplets in the bio-oil and completely removed char particles from the bio-oil, but heavy species are still the main components in the upgraded bio-oil; the soluble fractions contain aliphatic, benzene-ring-containing, ester, and bonded hydroxyl moieties, and methoxy-containing species are the most abundant GC/MS-detectable compounds.


Nie J.-Q.,Hefei University of Technology | Chen H.-W.,Hefei University of Technology | Song Q.-H.,Hefei University of Technology | Song Q.-H.,Anhui Province Key Laboratory of Biomass Clean Energy | And 4 more authors.
Energy and Fuels | Year: 2010

O-Methylation of phenols has been studied as an important organic reaction, and its products, aryl methyl ethers, are valuable intermediates in fine chemicals. The phenolic component is one of the factors leading to the thermal instability of biomass pyrolysis oils. O-Methylation of phenols is helpful to improve the stability of bio-oil. Using dimethyl carbonate (DMC) as a methylation reagent, model O-methylations of three phenols (phenol, guaiacol, and eugenol) have been investigated in an ionic liquid, 1-butyl-3- methylimidazolium chloride ([bmim]Cl), in the presence of water and carboxylic acid, separately. In [bmim]Cl at 130 °C, both hydrolysis of DMC and esterification of acetic acid with DMC would occur and compete with the O-methylation of phenol and decrease the yield of the methylation. However, the esterification of carboxylic acids is helpful for bio-oil upgrading. Under the same reaction conditions, the methylation was performed for a phenolic bio-oil, which is the ether extractive from the bottom layer of phase separation of a biomass pyrolysis oil by adding a salt solution. Gas chromatography/mass spectrometry (GC/MS) analysis showed that phenolic compounds in the bio-oil were converted completely to the corresponding aryl methyl ethers and carboxylic acids were esterified to the corresponding methyl esters. The phenolic bio-oil after the modification has greatly enhanced the heating value, more than 30%. The methylation of the phenolic bio-oil with DMC in [bmim]Cl may be a potential method for upgrading of bio-oil. © 2010 American Chemical Society.


Shah M.,Anhui Province Key Laboratory of Biomass Clean Energy | Dai J.-J.,Anhui Province Key Laboratory of Biomass Clean Energy | Guo Q.-X.,Anhui Province Key Laboratory of Biomass Clean Energy | Fu Y.,Anhui Province Key Laboratory of Biomass Clean Energy
Science China Chemistry | Year: 2015

With the depletion of fossil resources, there is a need to find alternative resources of fuels and chemicals. The use of renewable feedstock such as those from seed oil processing is one of the best available resources that have come to the fore-front recently. This paper critically analyzes and highlights major factors in the biodiesel industry, such as seeds oil composition, production methods, properties of biodiesel, problems and potential solutions of using vegetable seed oil, the composition, quality and effective utilization of crude glycerol, the catalytic conversion of glycerol into possible fuels and chemicals. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg


Liu M.,University of Shanghai for Science and Technology | Qin T.,University of Shanghai for Science and Technology | Zhang Q.,University of Shanghai for Science and Technology | Fang C.,University of Shanghai for Science and Technology | And 2 more authors.
Science China Chemistry | Year: 2015

In the present review, we summarize the progress for thermal reductive transformations of CO2 catalyzed by small homogeneous catalysts using earth-abundant elements. Three main types of transformations categorized by the use of different reductants (hydrogen, hydrosilanes, and boranes), in which no C–C bond formation is involved, are surveyed. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg


Chen H.-W.,Hefei University of Technology | Song Q.-H.,Hefei University of Technology | Song Q.-H.,Anhui Province Key Laboratory of Biomass Clean Energy | Liao B.,CAS Guangzhou Institute of Chemistry | And 3 more authors.
Energy and Fuels | Year: 2011

Effective separation methods must be developed before bio-oils become a source of chemical products or liquid fuels by further upgrading. Phase separation is one effective pathway to realize an initial isolation of bio-oils. When aqueous salt solutions are added, phase separation of the pyrolysis bio-oil can occur to form two different phases: the upper layer with high contents of water, acetic acid, and water-soluble compounds and the bottom layers with low water content and high lignin pyrolysis compounds [ Song, Q.-H.; Nie, J.-Q.; Ren, M.-G.; Guo, Q.-X.Effective phase separation of biomass pyrolysis oils by adding aqueous salt solutions. Energy Fuels 2009, 23 (6), 3307-3312 ]. In this paper, the salt-induced phase separation of bio-oils with 20 kinds of salt solutions was investigated. On the basis of the dependence of the mass ratio of the bio-oil bottom layer to the whole bio-oil sample upon the salt solution concentrations, it has been demonstrated that the phase separation derives from a normal ionic strength effect as well as chemical properties for some metal ions. Solvent fractionations of the two-phase bio-oils were performed, and fractions were characterized by elemental and gas chromatography/mass spectrometry (GC/MS) analyses. Among the four bottom-layer bio-oil fractions, fraction A contains insoluble macromolecular substances, such as cellulose, and fractions, B, C, and D are mainly phenolic compounds. Furthermore, O-methylation of the mixtures of fractions B, C, and D with dimethyl carbonate (DMC) has been performed in ionic liquid [Bmin]Cl, and the reaction is highly effective and recyclable for the ionic liquid. The modified mixture of the fractions reveals a large elevation in the heating value. © 2011 American Chemical Society.

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