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    30 May 2006, Volume 40 Issue 3 Previous Issue    Next Issue
    Synthesis of Nopol with Catalysis of Zinc Chloride Supported on Anion-Exchange Resin
    ZENG Qing-you;ZENG Ming-rong
    2006, 40 (3):  6-8. 
    Abstract ( 816 )   PDF (504KB) ( 630 )   Save
    Nopol is synthesised by the Prins condensation of β-pinene and paraformaldehyde with the catalysis of zinc chloride surpported on an anion-exchange resin. The yield of nopol is 62.4% under the conditions: the molar ratio of β-pinene to formaldehyde 3:1, the reaction temperature 80℃, and reaction time 4 h.This catalyst can be renewable.
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    A Study on Hydrogenation of Rosin Catalyzed with Pd/C in Supercritical CO2
    GAO Hai-Chun;YU Shi-tao;LI Lu;LIU Fu-sheng;XIE Cong-xia
    2006, 40 (3):  13-16. 
    Abstract ( 506 )   PDF (1137KB) ( 631 )   Save
    Hydrogenation of rosin over Pd/C catalysts was studied in supercritical CO2 (scCO2) phase. Comparison of results in scCO2 with those in conventional conditions showed that the product contained lower of abietic and hydroabietic acid. The effects of reaction temperature, reaction times, amount of Pd/C catalysts and the reuse of Pd/C catalysts were studied. The reason of the decrease of catalyst activity was the losing of Pd in Pd/C catalysts when were reused.
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    Study on the Extraction and Stability of Hesperidin
    WEN Chi-fu;LI Guo-zhang;DONG Ai-wen;LIU Gan
    2006, 40 (3):  37-40. 
    Abstract ( 1626 )   PDF (988KB) ( 1290 )   Save
    In ordor to use the peel of orange fully for maximum economic profits,the alkali-extraction and acid-precipitation method for extraction and the D-101 macroporous resin for purification of hesperidin from orange peels were used and the stability of hesperidin was investigated under conditions such as different temperature,time,oxygen, light,pH,metal ion,et al. The results showed that the content of hesperidin extracted by this method was 96.7%(HPLC), the extraction rate was 1.92%.Its solution was stable in the conditions as following: below 75℃, within 30 min,oxygenless, lightproof and acidic or neutral environment, whereas hesperidin would be oxidated to result in the molecular structure change if Fe3+,Cu2+ exisied,and in the condition with rich oxygen and light,especially strong light.
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    Brief Introduction to Clean Development Mechanism (CDM) (Ⅲ)—Clean Development Mechanism (CDM) in China
    DAI Wei-di
    2006, 40 (3):  59-62. 
    Abstract ( 650 )   PDF (775KB) ( 720 )   Save
    In this course, the basic knowledge and development state of the Clean Development Mechanism(CDM) in the world is introduced. According to the situation of our country, it is considered that it is very important and significant to implement CDM in China. Some situations about CDM in China are briefly introduced in this paper, including CDM program management rules, the basic process of CDM projects in China, and the priority fields and technologies on the CDM in China.
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    Study on Dehydroabietylamine Salicylidene Schiff Base as a Corrosion Inhibitor for Copper
    YAO Xu-jie;RAO Xiao-ping;WANG Zong-de;SONG Zhan-qian
    2006, 40 (3):  21-24. 
    Abstract ( 535 )   PDF (728KB) ( 669 )   Save
    Five kinds of dehydroabietylamine salicylidene Schiff bases were synthesized by direct condensation reactions, and their structures were identified by IR and 1H NMR. Their corrosion inhibition activity for copper was studied by static state weight loss method. The result indicated that the inhibition rate of Schiff base for copper increased with the increment of the Schiff base concentration, increment of the time of self-assemble film and decrease of corrosion time. Dehydroabietylamine 5,6-dihydroxy-salicylidene showed the best inhibition activity among these Schiff bases.
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    Application of Polymer Materials to Chemical Sand Fixation
    WANG Dan;SONG Zhan-qian;SHANG Shi-bin;WANG Yu
    2006, 40 (3):  44-47. 
    Abstract ( 703 )   PDF (802KB) ( 780 )   Save
    Desertification that causes tens of billion yuan of economical loss annually,which restricts regional continual development severely has been a nationwide problem. Chemical sand fixation is an important method of desertification control due to its low cost, efficiency and suppleness,for which polymer is the main material. The applications of several kinds of sand fixation agents including petrochemical, synthetic polymer, biomass, and superabsorbent polymer for the desertification control were summarized.
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    Research Progress on Enzymatic Hydrolysis of Lignocellulosic Materials
    JIN Shi-wei;ZHU Sheng-dong;WU Yuan-xin;YU Zi-niu
    2006, 40 (3):  48-53. 
    Abstract ( 732 )   PDF (1040KB) ( 780 )   Save
    Enzymatic hydrolysis is one of the key procedures in the fuel ethanol production from lignocellulosic materials. The cellulase and its mechanism of hydrolyzing lignocellulosic materials, the production of cellulase, the affecting factors of enzymatic hydrolysis of lignocellulosic materials and its hydrolysis kinetics were reviewed. Some suggestions were given to improve efficiency and decrease the cost of enzymatic hydrolysis of lignocellulosic materials.
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    Production of l-Lactic Acid from Soybean Straw Enzymatic Hydrolysate Fermentated by Lactobacillus Casei
    XU Zhong;YANG Ping;ZHAO Lan-tian
    2006, 40 (3):  9-12. 
    Abstract ( 564 )   PDF (869KB) ( 716 )   Save
    From four bacteria producing l-lactic acid, one bacterium was selected as an experimental bacterium according to its good performance, high sugar utilization ratio and lactic acid output. The factors affecting fermentated of soybean straw enzymatic hydrolysate by Lactobacillus casei had been studied. The optimum fermentation conditions were found as following: the suitable inoculating amount of Lactobacillus casei 10%, temperature 30℃, pH 5.5. With the increase of the sugar content in substrate enzymatic hydrolysate, the output of lactic acid increased correspondingly even up to 80%.
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    Advances in Studies on Dissolving Cellulose Solvent
    WANG Hai-yun;ZHU Yong-nian;CHU Fu-xiang;CAI Zhi-hui
    2006, 40 (3):  54-58. 
    Abstract ( 954 )   PDF (1069KB) ( 1091 )   Save
    The organic and water solvent systems for dissolving cellulose are reviewed, meanwhile, the dissolving mechanism and feature of different solvents are discussed. Solvents based on N-methylmorpholine oxide and the alkali metal hydroxides are described in detail. And the use of cellulose solutions are also showed in brief.
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    Adsorption Behavior of the Bamboo-charcoal for Zn2+
    WANG Gui-xian;ZHANG Qi-wei
    2006, 40 (3):  17-20. 
    Abstract ( 695 )   PDF (695KB) ( 972 )   Save
    The adsorption behavior of the bamboo-charcoal for Zn2+ was studied in an aqueous solution.The effects of contact time, pH, mass of absorbent, adsorption temperature,and initial concentration of Zn2+ on absorption were determined.Results showed that bamboo-charcoal could effectively remove Zn2+ from the aqueous solution with high adsorption ability at pH 3.2~6.2, in which the optimum is pH 5.3 in HAc-NaAc medium. Because adsorption decreased with increase in adsorption temperatures, it means that the sorption process is an exothermic process, which the adsorption behavior of the bamboo-carbon for Zn2+ obeys the Freundlich isotherm model. After adsorption the bamboo-charcoal can be regenerated quantificationally with H2O and microwave heating in a regeneration ratio of 97%.
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    Extracting Natural Bamboo Fibers from Crude Bamboo Fibers by Caustic Treatment
    XU Wei;TANG Ren-cheng
    2006, 40 (3):  1-5. 
    Abstract ( 590 )   PDF (1786KB) ( 915 )   Save
    Caustic soda solution was utilized to treat and purify crude bamboo fibers. The effects of caustic soda concentration and temperature on the removal of impurities and the micro-structure properties of extracted bamboo fibers were investigated by the determination of weight loss and the analysis of SEM, FT-IR, UV-Vis and WAXD. Bamboo cellulosic fibers were not well separated due to the insufficient removal of impurities at 30℃ and 90℃. However, when crude bamboo fibers were treated at 100℃, 110℃ and 120℃ (esp. 110℃ and 120℃), the weight loss was high, the impurities could be adequately removed, so bamboo cellulosic fibers were easily separated out. High temperature and high caustic soda concentration promoted the dissolve of hemi-cellulose and lignin, but cellulose was easily degraded when caustic soda concentration was over 45 g/L at 110℃ and 120℃. In the present condition, extracted bamboo fibers belonged to celluloseⅠ. It was concluded that the extraction of bamboo cellulosic fibers should be appropriately performed at the conditions of high temperature, high pressure and low caustic soda concentration, which yielded about 81.8% bamboo fibers.
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    Synthesis of α-Pinene-Maleic Anhydride Adduct
    LUO Chang-quan;DUAN Wen-gui;CEN Bo;BAN Li-na
    2006, 40 (3):  25-28. 
    Abstract ( 551 )   PDF (643KB) ( 1148 )   Save
    1-Isopropyl-4-methyl bicyclooct-5-ene-2,3-dicarboxylic anhydride (α-terpinene-maleic anhydride adduct,TMA) was prepared via isomerization of α-pinene followed by Diels-Alder reaction with maleic anhydride in the presence of DLB catalyst. Influence factors such as reaction temperature, dosage and variety of catalyst and reaction time were studied, and the optimum conditions were found by orthogonal tests to be as follows: reaction temperature 145℃, dosage of catalyst DLB 3% (based on the weight of α-pinene), reaction time 1.0 h (molar ratio 1.4:1 of α-pinene to maleic anhydride). The yield of TMA amounted to 88% and the purity was up to 92%. The TMA was analyzed and characterized by IR, TLC, GC and GC-MS.
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    Synthesis of Lauryl Dehydroabietate and β-Phenylethyl Dehydroabietate
    CUI Guo-you;ZHENG Yun-fei;MO Bing-rong;CHEN Wen-na
    2006, 40 (3):  29-30. 
    Abstract ( 614 )   PDF (373KB) ( 651 )   Save
    The simple route for synthesis of lauryl dehydroabietate and β-phenylethyl dehydroabietate was reported in the paper. Dehydroabietyl chrolide was synthesized through the reaction of dehydroabietic acid and SOCl2 at room temperature,after which lauryl dehydroabietate and β-phenylethyl dehydroabietate were synthesized through the reaction of dehydroabietyl chrolide and lauryl alcohol, β-phenylethanol at room temperature.
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    An Exploration on Purification of Polymerized Rosin
    CHEN Wan-chun;LU Yu-dong;TU Yong-kun;LIU Yue-rong;WU Zong-hua
    2006, 40 (3):  34-36. 
    Abstract ( 757 )   PDF (571KB) ( 623 )   Save
    Effects of chemicals and temperature on color of polymerized rosin were investigated.The results showed that the chelating agent and oxalic acid exhibited a good washing performance in reducing color of the rosin. The Gardner color of the polymerized rosin produced in a factory with chelating agent was reduced for one grade.
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    Study on the Oxidation Resistance of Constituents Extracted from the Seed-shell of Korean Pine by Supercritical CO2
    Wang Zhen-yu;Jing Qiu-ju;Cheng Cui-lin
    2006, 40 (3):  41-43. 
    Abstract ( 441 )   PDF (560KB) ( 710 )   Save
    In the article, oxidization-inhibited constituents obtained from the seed-shell of korean pine by the supercritical CO2 extraction method was studied, and the relationship, between the oxidization-inhibited constituents and the processing parameters including the pressure, the time and the temperature was also analyzed. It was concluded that the optimial conditions were as follows: the pressure 40 MPa, the temperature 35℃ and time 120 min,by which gave a yield of 2.4%. And there were 42.1% of the extract were constituents,with anti-oxidation ability stronger than others. In addition,the constituents extracted from the seed-shell of korean pine had the obvious anti-oxidation to the edible soybean oil and a dose-effect relationship between the adding arnount and anti-oxdation effect was found. As the addition of 0.6%, the oxidation resistance was the best.
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    Comparison of Surface Activity of Sulfonated Components from the Waste of Larch Bark Tannin Production
    WANG Zhe;LI Zhong-zheng;HE Xue-nian
    2006, 40 (3):  31-33. 
    Abstract ( 573 )   PDF (671KB) ( 647 )   Save
    The chemical composition of the components from the waste of the larch bark tannin production and the surface activity of their sulfonated products were investigated. In comparison with the wood lignosulfonate, the higher surface activity and dispersity of the sulfonated product of waste from larch bark tannin prodution are originated from its tannin and phlobaphene components and the higher coment paste fluidity is due to the presence of tannin and phenolic acids.
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