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    30 March 2007, Volume 41 Issue 2 Previous Issue    Next Issue
    Comparison of Different Methods for Resveratrol Extraction from Polygonum cuspidatum
    XIE Lei;LI Zhi-guang;ZHOU Jun;HUANG Qiong
    2007, 41 (2):  28-30. 
    Abstract ( 571 )   PDF (554KB) ( 771 )   Save
    Four methods such as ethanol extraction, alkaline extraction, ultrasonic extraction and SFE-CO2 were used for extraction of resveratrol from Polygonum cuspidatum. The content of resveratrol in Polygonum cuspidatum was determined by HPLC. The extraction methods were compared based on the yield of resveratrol. The results showed that the ultrasonic extraction was the best method for extraction of resveratrol.
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    Study on Quantitative Determination of Pyrogallic Acid
    WU Dong-mei;CHEN Jia-hong;WANG Yong-mei;WU Zai-song
    2007, 41 (2):  41-43. 
    Abstract ( 671 )   PDF (526KB) ( 728 )   Save
    An UV-spectrophotometry determination method for pyrogallic acid content was studied. Test solution of pyrogallic acid was prepared by adding formic acid as antionxidative stabilizer, thus the measuring instability due to the oxidability of pyrogallic acid was overcome. The appropriate addition of formic acid (0.1 mol/L) into test solution was 10 mL. UV absorption peak of the test solution was determined at 266 nm. The stability of determination value, linear relationship between concentration and UV-absorbance under test condition were proved, and error of measurement was estimated. The study results indicated that this new method could be used for quantitative determination of pyrogallic acid in production for its simpleness, cheapness, veracity and stability.
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    The Present Situation of Preparation Technology of Biodiesel
    MENG Zhong-lei;JIANG Jian-chun;LI Xiang-yu
    2007, 41 (2):  59-65. 
    Abstract ( 653 )   PDF (1176KB) ( 881 )   Save
    The present situation of biodiesel preparation was summarized.The main production technology of biodiesel at home and abroad was introduced.The batch type and the continuous production to prepare biodiesel were discussed.The development prospects were proposed in this paper.
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    Roles of Activated Carbon Reference Materials in Market Criterion
    DAI Wei-di;SUN Kang;TONG Ya-juan;CHANG Xia;ZHANG Yan-ping;SUN Yun-juan
    2007, 41 (2):  66-68. 
    Abstract ( 689 )   PDF (581KB) ( 663 )   Save
    This article describes the development status of activated carbon reference materials, and emphasizes that nowadays to undertake the study on preparation of activated carbon reference materials is very important in China. It also explains the significant roles of activated carbon reference materials in market criterion from five deferent aspects. It summarizes that the study work of activated carbon reference materials in China is promising.
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    The Application of Tea Waste in Urea-formaldehyde Resin Adhesive
    LI Jian-zhang;ZHOU Wen-rui;XU Li-zheng;OUYANG Ni
    2007, 41 (2):  44-46. 
    Abstract ( 716 )   PDF (509KB) ( 732 )   Save
    The tea waste powder with different sizes as an additive was used to urea-formaldehyde (UF) resin, and the effects of the tea waste powder sizes and amount on the free formaldehyde content of UF resin, the formaldehyde emission, and bond strength of UF resin bonded plywood were studied in this paper. The experimental results indicated that the tea waste powder as an additive to UF resin could reduce its free formaldehyde content and reduce the formaldehyde emission of UF resin bonded plywood; the tea waste powder with much less size was easily mixed with UF resin and acted much more effective; the tea waste as an additive to UF resin in a proper amount did not decrease the bond strength of plywood.
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    Primary Study on Purification of Eleostearic Acid
    ZHANG Min;CAO Yong;HUANG Ru-yi
    2007, 41 (2):  35-37. 
    Abstract ( 629 )   PDF (583KB) ( 692 )   Save
    Purification conditions of eleostearic acid were primarily studied. The content of eleostearic acid was determined by gas chromatography. The main factors which affect eleostearic acid crystallization were studied by single factor test and uniform design test. The optimal condition for crystalliztion was 18 h at the temperature of -12℃ by acetone and the content of α-eleosteacric acid in purified product was up to 92.55%.
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    Research Progress of Biological Utilization of Synthesis Gas
    LI Dong;YUAN Zhen-hong;LU Peng-mei;ZHUANG Xin-shu;SUN Yong-ming;XU Jing-liang
    2007, 41 (2):  54-58. 
    Abstract ( 589 )   PDF (730KB) ( 754 )   Save
    The production of organic acid or alcohol, methane, hydrogen and biological desulfurization using synthesis gas were introduced and discussed. The lower production capacity and lower product concentration were the two biggest problems of this technology. Some selected resolving approaches were also provided.
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    Research Progress of Pyrolysis Kinetics of Biomass
    XIU Shuang-ning;YI Wei-ming;LI Bao-ming
    2007, 41 (2):  47-53. 
    Abstract ( 589 )   PDF (1235KB) ( 934 )   Save
    The research progress of experimental and theoretical work on pyrolysis kinetics at home and abroad was reviewed. The research situation and characteristics of apparatuses for the study on fast pyrolysis kinetics model of biomass were mainly introduced and compared each other. The key points for optimization of development, design, and operation of reactors were described. The current pyrolysis models were classified and compared. The research future was also proposed.
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    Statement of Biomass Energy Standard System(Ⅴ) —— Design of Biomass Energy Standard System Frame
    LIU Jun-li;JIANG Jian-chun
    2007, 41 (2):  69-72. 
    Abstract ( 638 )   PDF (874KB) ( 797 )   Save
    Biomass energy is an renewable and clean energy. Focusing on biomass energy products and according to their different physical states, the standardization system of biomass energy is proposed in the course series on the basis of investigation of the international standardization of major products. On the basis of expatiating the basic principle, purpose and method of designing biomass energy standard system, the three dimensional frame of biomass energy standard system is designed in this paper.
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    Study on Homogeneous Hydrolysis of Bamboo Fiber during Dissolution
    SUN Yong;LIN Lu;PANG Chun-sheng;DENG Hai-bo;PENG Hong;LI Jia-zhe;SUN Run-cang
    2007, 41 (2):  5-10. 
    Abstract ( 681 )   PDF (1060KB) ( 776 )   Save
    It was found that bamboo fiber could be effectively dissolved in formic acid solution containing a catalyst. Cellulose of bamboo fiber was hydrolyzed during dissolution. Formic acid could be cleanly recycled for using. The solid product of soluble sugars was obtained. Bamboo fiber started to be swelled after 0.5 h of addition to formic acid solution. It was gradually dissolved after 1.0 h and the color of solution changed to light green black. It was basically dissolved after 2.0 h and the color of solution gradually became darker. It was completely dissolved after 4.0 h. After 6.0 h of reaction at 60℃ treatment, the solid product containing glucose, cellobiose, cellotriose, cellotetrose, cellopentose and cellohexaose was obtained from the reaction system. The yield of glucose was 54.5%.
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    Study on Extraction of Flavonoids fromHydrocotyle sibthorpioides var.
    JIANG Yi-hua
    2007, 41 (2):  38-40. 
    Abstract ( 722 )   PDF (482KB) ( 771 )   Save
    The optimal extraction conditions of total flavonoid from Hydrocotyle sibthorpioides var were obtained by orthogonal test. The content of total flavonoid was determined by UV method. The results showed that the yield of total flavonoid was 2.67% at the conditions of 50% ethanol solution, 80℃,1:30 solid-liquid ratio and 1 h for extraction.
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    Material and Heat Balance Calculations of 500 t/a Pilot Plant of Biodiesel
    ZHANG Tian-jian;JIANG Jian-chun;NIE Xiao-an;CHANG Xia
    2007, 41 (2):  18-22. 
    Abstract ( 600 )   PDF (871KB) ( 609 )   Save
    Biodiesel is a kind of clean and renewable energy. This article introduces the material and heat balance calculations which can be used in equipment size and dimension design for a 500 t/a pilot plant. The calculations introduced in this paper can also be used to estimate the values of energy consumption in each working procedure,and to provide the corresponding parameters for production line design and the thermal load parameters for making the right selection of equipment types.
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    Modification of Larch Bark Tannin Extracts and Property of their Solution
    CHEN Xiang-ming;CHEN He-ru;LI Wei-bin
    2007, 41 (2):  31-34. 
    Abstract ( 633 )   PDF (617KB) ( 748 )   Save
    This paper illustrates the reaction of larch bark tannin extracts with sulfite and sodium hydroxide and the tests of its solution viscosity, MW-distribution and thin-layer chromatography. It shows that the solution viscosity drops and the relative molecular mass reduces with narrow distribution. The high sulfitated larch bark tannin extracts are more available to decrease the solution viscosity than the alkali treated extracts. The modified larch bark tannin extracts can be used in production of bakelite bond.
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    Study on Adsorption of Baicalin on Immobilized Tannins Macroporous Adsorption Resin
    DU Jie;ZHANG Li-ping;WANG Fan;PU Jun-wen
    2007, 41 (2):  23-27. 
    Abstract ( 703 )   PDF (956KB) ( 765 )   Save
    The process of static adsorption,desorption,dynamic adsorption and adsorption kinetics of baicalin on macroporous adsorption resin immobilized tannins by Mannich reaction were investigated.The results showed the optimal conditions of the static adsorption are: the concentration of baicalin is 45 mg/L,the mass of resin is 0.2 g,pH value is controlled between 5.5-5.99,the temperature of adsorption is 35℃,the adsorption time is 24 h; isothermal adsorption fitted to Freundlich isothermal equation;the optimal conditions of the static desorption are: the concentration of ethanol is 70 %,the temperature of desorption is 35℃,the desorption time is 3 h; particle dispersion was the major controlling step of adsorption rate which can be described by G E Boyd equation.The absorption capacity of immobilized tannins macroporous adsorption resins is 25 mg/g.
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    Study on New Preparation Technique of Biodiesel from Natural Oils ——The Selection and Best Constitution of Reaction Catalysts for Synthesis of Biodiesel
    NIE Xiao-an;JIANG Jian-chun;DAI Wei-di;CHANG Xia
    2007, 41 (2):  1-4. 
    Abstract ( 598 )   PDF (696KB) ( 754 )   Save
    The reaction activity of catalysts on the synthesis of biodiesel from different oils was studied.By the analysis of GC and chemical method, the best constitution of catalysts was obtained.The results show that the alkaline material was the best catalyst to catalyze the transesterification of oils with acid value below 10 due to their best catalytic result and short reaction time,but for the oils with acid value above 10, neither the acid nor the base, could catalyze the transesterification in a short time.The catalyst NG made in this research, under the condition of temperature 180℃,time 2 h and catalyst dosage 0.1%, had high catalytic activity. The yield of 93% was obtained. The catalyst NG had profound practical significance in subcritical fluid technique.
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    Study on Gas Chromatography Quantitative Analysis Condition of Gum Rosin
    WANG Zhen-hong;SONG Zhan-qian;SHANG Shi-bin;YE Bai-hui
    2007, 41 (2):  11-17. 
    Abstract ( 706 )   PDF (847KB) ( 777 )   Save
    The gas chromatography quantitative analysis conditions of gum rosin were studied by selection of chromatographic columns and chromatographic resolution conditions with the pure rosin sample of P.kesiya var. langbinanensis (A.Chev.)Gaussen.This analysis method could accurately determine the relative percentage content of rosin resin acid. The analysis results were better in stability, accuracy and reproducibility by statistical error test of Grubb's method. The same conclusions were obtained from rosin quantitative analyses of P.massoniana Lamb. and P.elliottii Engelm.
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