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    30 May 2012, Volume 46 Issue 3 Previous Issue    Next Issue
    Synthesis,Characterization and Properties of Allyl Ester of Maleopimaric Acid
    WANG Ji-fu;CHANG LI-li;YU Juan;NAN Jing-ya;LIU Yu-peng;LIN Ming-tao;WANG Chun-peng;LIU Mei-hong;CAI Zhi-hui;CHU Fu-xiang;
    2012, 46 (3):  1-4. 
    Abstract ( 590 )   PDF (1164KB) ( 855 )   Save
    Allyl ester of maleopimaric acid (MA-BXC) with a purity of 99.2% was prepared by the reaction between maleopimaric acyl chloride and allyl alcohol with the yields near to 70%. The structure and properties of MA-BXC was evaluated by FT-IR spectroscopy, GC-MS, 13C NMR spectroscopy and DSC. The results indicated that MA-BXC was an allyl monomer with anhydride group and can be polymerized while being heated to above the melting point. The glass transition temperature of MA-BXC's homopolymer is about 98℃. These results showed that MA-BXC had a great potential to be used as a precursor of unsaturated resin and epoxy resin.
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    Preparation of Activated Carbon with High Adsorption Properties from Coconut Shell by Pyrolysis and Activation
    LIU Xue-mei;JIANG Jian-chun;SUN Kang;XU Fan;XU Yu
    2012, 46 (3):  5-8. 
    Abstract ( 621 )   PDF (967KB) ( 1247 )   Save
    Activated carbon with high adsorption properties were prepared from coconut shell by pyrolysis and activation. The effects of activation temperature and time on adsorption properties of activated carbons were investigated. The results show that under the condition of activation temperature at 900 ℃ for 8 hours with the heating rate 10 ℃/min, the prepared carbon has the iodine adsorption of 1 628.54 mg/g and methylene blue adsorption of 375 mg/g, and the yield is 9.41%. The results of N2 adsorption show that its surface area is 1 723 m2/g, with total pore volume of 0.87 cm3/g, micropore volume of 0.68 cm3/g, mesopore volume of 0.18 cm3/g, and the average pore size of the activated carbon is about 2.03 nm. The properties of the activated carbon from coconut shell by pyrolysis and activation are superior to that of water purification and monosodium glutamate decolorization activated carbon in national standard.
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    Method for the Determination of Vitamin C and Its Content Changes in Sonchus oleraceus L.
    CHU Hong-ying;CUI Hong;YUAN Qi
    2012, 46 (3):  9-12. 
    Abstract ( 935 )   PDF (863KB) ( 1237 )   Save
    The aim of this paper was to study the method for the determination of vitamin C and its content changes in different months and parts in Sonchus oleraceus L. The absorbance of extract was scanned at 190-510 nm by the ultraviolet spectrophotometer. The maximum absorption is 267 nm and the content was calculated. Results showed that the content of vitamin C in different parts was flower>leaf>stem>root in April and flower>leaf>root>stem from May to July. Vitamin C content in leaf was higher in April and in flower was higher in May. This method is simple, quick and accurate. The results were useful to the further development and utilization of S.oleraceus L. resources.
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    The Research on Cellulase Production of Green Liquor Pretreated Corn Stover
    ZHAO Shi-ming;LU Qing-shan;GU Feng;YU Shi-yuan
    2012, 46 (3):  13-19. 
    Abstract ( 892 )   PDF (995KB) ( 855 )   Save
    The effect of green liquid pretreated corn stover on cellulase production of Trichoderma reesei was investigated. Inspecting the influence of pretreatment conditions on cellulase production of corn stover at different cooking temperature, total alkali charge and sulfidity by orthogonal experiment, we could conclude from range and variance analysis that the extent of impact to cellucase production of green liquor pretreated corn stover was in turn total alkali charge, cooking temperature and sulfidity. The optimum filter paper activity (FPA) reached 2.6 IU/mL. FPA productions from corn stover pretreated by cooking temperature 140 ℃ and 170 ℃, total alkali charge 4 %, sulfidity 0, 20 %, 30 % and 40 %, were comprehensively compared and evaluated. It was found that the optimum conditions,i.e., cooking temperature 140 ℃, total alkali charge 4 %, sulfidity 0, might ensure the value of FPA on and avoid the loss of materials. The results showed that green liquid pretreatment for corn stover was feasible for cellulase production of Trichoderma reesei. Taking corn stover pretreated by cooking temperature 140 ℃, total alkali charge 4% and sulfidity 0 as carbon sources whose concentration was 12 g/L, FPA and β-glucosidase activity(β-GA) were up to 2.5 IU/mL and 1.3 IU/mL respectively. The enzyme production period was 5 days.
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    Research Progress of Adsorption and Desorption of CO2 on Activated Carbon
    JIAN Xiang-kun;LIU Shi-cai;BIAN Yi
    2012, 46 (3):  20-26. 
    Abstract ( 940 )   PDF (882KB) ( 1760 )   Save
    In this paper, the main source and application of CO2,the common methods of industrial separation and recovery of CO2 were introduced. The application of activated carbons in separating gas used PSA technology, and the common methods of adsorbents regeneration in process of PSA were also discussed. Factors including pore structure and surface chemical structure of activated carbons that influenced the performance of adsorption and recovery of CO2 on activated carbons were reviewed.
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    Advance Research on the Preparation of High Specific Surface Area Activated Carbon for Adsorption and Storage of Natural Gas
    WANG Guo-dong;DENG Xian-lun;LIU Xiao-min;ZHU Guang-zhen
    2012, 46 (3):  27-32. 
    Abstract ( 706 )   PDF (879KB) ( 1664 )   Save
    This paper reviewed physical, chemical and chemical followed with physical methods to prepare high specific surface area activated carbon. Three methods reference to packing adsorbent particles, fabricating with binder and binderless molding to improve packing density were summarized. At last, we introduced the latest research progress at home and abroad, and discussed the existing problems in the natural gas adsorption and storage, and the corresponding solutions.
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    Research Progress on Enzymatic Hydrolysis of Lignocellulosic Materials into Fermentable Sugars
    SUN Zong-ping;ZHANG Jun-hua
    2012, 46 (3):  39-44. 
    Abstract ( 751 )   PDF (987KB) ( 814 )   Save
    Enzymatic hydrolysis is a key step in the production of bioethanol and other chemicals from lignocellulosic materials. Due to the complex components and inhomogeneous structure of lignocellulosic substrates, completely hydrolysis of lignocellulose carbohydrates into fermentable sugars requires different cellulases and hemicellulases. Relatively low hydrolytic efficiency and the high costs of enzyme are often considered to be the major bottlenecks on the commercialization of lignocellulosic ethanol. Thus, efficient enzymatic hydrolysis is of great importance to improve the hydrolysis of lignocellulosic materials, lower enzyme dosages, and consequently drop the cost. In this paper, structure of lignocelluloses, cellulases and hemicellulases, factors affecting enzymatic hydrolysis including substrate, product, enzyme properties, and surfactant, have been reviewed. The recent trends and perspectives of future development are highlighted, as well.
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    Research Progress of Extraction Technologies of Oleuropein
    XIE Pu-jun;HUANG Li-xin;ZHANG Cai-hong;WANG Cheng-zhang;YE Jian-zhong;ZHOU Hao;
    2012, 46 (3):  33-38. 
    Abstract ( 722 )   PDF (1002KB) ( 1347 )   Save
    The extraction technologies of oleuropein are summarized in this paper. The extraction time, efficient and energy consumption for each method are discussed. The assembly of ultrasound and low-temperature vacuum is considered as an appropriate method for industrialized production, which is easy to operate with high efficiency and low energy consumption. In addition, we hope that the extraction of natural product could be directly connected with advanced analysis equipment in future, such as HPLC, GC-MS and so on. It not only increases the detecting and analyzing speed greatly, but also controls the quality of product. This will be a trend of development in the future to study the extraction and separation of natural products.
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    Preparation Technology and Research Developments of Aviation Biofuel
    LIU Guang-rui;YAN Bei-bei;CHEN Guan-yi
    2012, 46 (3):  45-48. 
    Abstract ( 1025 )   PDF (940KB) ( 2717 )   Save
    Development of renewable aviation biofuels is an important measure for the air transport industry to decrease carbon emissions and reduce fuel costs. Three different aviation biofuel synthesis technologies were described as follows: F-T process, hydrotreating technology, and synthetic hydrocarbons. Besides, the future applications of these technologies were compared and analyzed.
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    The Separation Methods of Solid Particles in Biomass Pyrolysis Gas
    LI Mei-lian;BAI Xue-yuan;LI Yong-jun;GAO Xiao-feng
    2012, 46 (3):  49-55. 
    Abstract ( 726 )   PDF (1140KB) ( 1018 )   Save
    According to the characteristics of product in biomass pyrolysis and the requirements of biomass pyrolysis liquefaction technology on dust collector, several suitable dust collectors and methods for dry dust removal were compared. The current development of dust removal equipment used in the pyrolysis of biomass were presented. The existing problems were pointed out in this paper, as well.
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