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You Y.,Beijing Forestry University | Yang S.,Beijing Forestry University | Bu L.,State Grid Corporation of China | Jiang J.,Beijing Forestry University | Sun D.,Nanjing Institute for the Comprehensive Utilization of Wild Plant
RSC Advances | Year: 2016

Byproducts of simultaneous saccharification and fermentation (SSF) from sugarcane bagasse using steam explosion (SE, 190°C for 10 min and 210°C for 5 min) and green liquor (GL) combined with hydrogen peroxide (GL-H2O2) or ethanol (GL-ethanol) pretreatments were compared. Results showed that SE pretreatments did not result in lactic acid because a majority of the glucose was consumed for yeast growth and ethanol production, and the ethanol yield of 93.86% (of the theoretical) at 190°C for 10 min and 94.33% at 210°C for 5 min were achieved. Most of the hemicelluloses were removed and more acetyl groups were generated after the SE pretreatment, so it always had the highest amount of acetic acid (1.22 g L-1 at 190°C for 10 min and 1.38 g L-1 at 210°C for 5 min). GL-ethanol pretreatment resulted in an ethanol yield of 80.56%. However, the existence of reactive lignin from organic solvent produced high amount of byproducts, especially for the maximum glycerol contents (0.818 g L-1). Deficient lignin removal and sugar degradation with GL-H2O2 pretreatment led to the lowest ethanol yield of 23.23%, which may be because some inhibitors generated from GL-H2O2 pretreatment affected hydrolysis efficiency and yeast activity in the SSF process. © 2016 The Royal Society of Chemistry.


Zhang W.-M.,Nanjing Institute for the Comprehensive Utilization of Wild Plant | Qian S.-S.,Shandong University of Technology | You Z.,Liaoning Normal University
Asian Journal of Chemistry | Year: 2014

Two new hydrazone compounds, 2-cyano-N′-(3-ethoxy-2-hydroxybenzylidene)acetohydrazide (1) and 2-cyano-N′-(2-methoxybenzylidene)-acetohydrazide (2 ), were prepared and structurally characterized by elemental analysis, IR and UV-visible spectra and single crystal X-ray determination. Compound 1 crystallizes as monoclinic space group P21/c, with unit cell dimensions a = 19.573(7) A˚, b = 9.620(4) A˚, c = 13.731(5) A˚, β = 110.372(4)°, V = 2423.8(15) A˚3, Z = 8, R1 = 0.1047 and wR2 = 0.2767. Compound 2 crystallizes as monoclinic space group P21/c, with unit cell dimensions a = 4.503(2) A˚, b = 10.066(3) A˚, c = 24.435(3) A˚, β = 95.29(2)°, V = 1103.0(5) A˚3, Z = 4, R1 = 0.0430 and wR2 = 0.0978. Crystal of the compounds are stabilized by hydrogen bonds and π⋯π interactions. © 2014, Chemical Publishing Co. All rights reserved.


Zhang W.-M.,Nanjing Institute for the Comprehensive Utilization of Wild Plant | Qian S.-S.,Shandong University of Technology | You Z.,Liaoning Normal University
Asian Journal of Chemistry | Year: 2014

Two new oxovanadium(V) complexes, [VOL1 (HQ)] (1) and [VOL2(HQ)] (2), were prepared by the reaction of [VO(acac)2] (where acac = acetylacetonate), 8-hydroxyquinoline (HHQ) with N′-(5-fluoro-2-hydroxybenzylidene)-4-fluorobenzohydrazide (H2L1) and N′-(5-fluoro-2-hydroxybenzylidene)-4-methoxybenzohydrazide (H2 L2 ), respectively, in methanol. Crystal and molecular structures of the complexes were determined by elemental analysis, infrared and UV-visible spectra and single crystal X-ray diffraction. Complex 1 crystallizes in the orthorhombic space group Pbcn, with unit cell dimensions a = 32.327(2) A˚, b = 8.189(2) A˚, c = 16.817(1) A˚, V = 4451.9(9) A˚3, Z = 8, GOOF = 1.060, R1 = 0.0587 and wR2 = 0.0921. Complex 2 crystallizes in the monoclinic space group P21/n, with unit cell dimensions a = 12.4965(8) A˚, b = 13.3795(9) A˚, c = 13.8324(9) A˚, β = 115.555(2)°, V = 2086.5(2) A˚3, Z = 4, GOOF = 1.047, R1 = 0.0378 and wR2 = 0.0919. The V atoms in the complexes are in octahedral coordination, with the phenolate oxygen, imino nitrogen and enolate oxygen of the benzohydrazone ligand and the hydroxy oxygen of 8-hydroxyquinoline in the equatorial plane and with the pyridine nitrogen of 8-hydroxyquinoline and one oxo group in the two axial positions. Thermal stability of the complexes was also studied. © 2014, Chemical Publishing Co. All rights reserved.


Zhang W.-M.,Nanjing Institute for the Comprehensive Utilization of Wild Plant | Qian S.-S.,Shandong University of Technology | You Z.,Liaoning Normal University
Asian Journal of Chemistry | Year: 2014

Two new bis-Schiff base compounds, N,N′- bis(5-fluoro-2-hydroxybenzylidene)-ethylenediamine (1 ) and 4,4′-difluoro-2,2′-[(hydrazine-1,2-diylidene)bis(methanyl-ylidene)]diphenol (2), were prepared and structurally characterized by elemental analysis, IR, 1H NMR and UV-visible spectra and single crystal X-ray determination. Compound 1 crystallizes as monoclinic space group P21/n, with unit cell dimensions a = 7.227(2) A˚, b = 10.970(3) A˚, c = 9.973(2) A˚, β = 104.913(2)°, V = 695.1(3) A˚3, Z = 2, R1 = 0.0893 and wR2 = 0.2724. Compound 2 crystallizes as monoclinic space group P21/n, with unit cell dimensions a = 8.205(1) A˚, b = 6.643(1) A˚, c = 11.816(2) A˚, β = 105.848(3)°, V = 619.6(1) A˚3, Z = 2, R1 = 0.0424 and wR2 = 0.0879. Crystal of the compounds are stabilized by hydrogen bonds and π⋯π interactions. © 2014, Chemical Publishing Co. All rights reserved.


Yu H.,Beijing Forestry University | You Y.,Beijing Forestry University | Lei F.,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products | Liu Z.,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products | And 2 more authors.
Bioresource Technology | Year: 2015

Green liquor (GL) combined with H2O2 (GL-H2O2) and green liquor (GL) combined with ethanol (GL-ethanol) were chosen for treating sugarcane bagasse. Results showed that the glucose yield (calculated from the glucose content as a percentage of the theoretical glucose available in the substrates)of sugarcane bagasse from GL-ethanol pretreatment (97.7%) was higher than that from GL-H2O2 pretreatment (41.7%) after 72h hydrolysis with 18 filter paper unit (FPU)/g-cellulose for cellulase, 27,175 cellobiase units (CBU)/g-cellulose for β-glucosidase. Furthermore, about 94.1% of xylan was converted to xylose after GL-ethanol pretreatment without additional xylanase, while the xylose yield was only 29.2% after GL-H2O2 pretreatment. Scanning electron microscopy showed that GL-ethanol pretreatment could break up the fiber severely. Moreover, GL-ethanol pretreated substrate was more accessible to cellulase and more hydrophilic than that of GL-H2O2 pretreated. Therefore, GL-ethanol pretreatment is a promising method for improving the overall sugar (glucose and xylan) yield of sugarcane bagasse. © 2015 Published by Elsevier Ltd.

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