Table of Content

30 July 2006, Volume 40 Issue 4 Previous Issue    Next Issue

研究报道

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Study on Synthesis of Modified Lignin Foam Resin WEI Min;YAN Li-nan;JIANG Jian-chun 2006, 40 (4):  1-3.  Abstract ( 778 )   PDF (493KB) ( 930 )   Save Using the dilute acid hydrolysis lignin and straw alkali lignin as materials and selecting many kinds of polyols as esterification agents, a series of hydroxyl containing lignin polyesters with various chain length were synthesized. The rigid polyurethane foam was prepared using lignin polyesters as polyols component.Experimental results showed the properties of lignin poly-esters were as follows: the viscosity of lignin polyesters: 3 000-5 000 cP·s/20℃,hydroxyl value:380-450 mg/g, acid value: < 5 mg/g. The properties of lignin foam: apparent density: 0.03-0.05 g/cm3, compression strength: >0.15 MPa, thermal conductivity: 0.023 W/(M·K), water adsorption:3%. The physical properties of lignin polyurethane foam meet the demands of industry and daily life for heat insulating material. Related Articles | Metrics

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Study on IR Analysis and Comprehensive Thermal Analysis of Rosin Maleic Adduct and Its Bromide YU Cai-li;ZHANG Fa-ai 2006, 40 (4):  28-30.  Abstract ( 723 )   PDF (625KB) ( 946 )   Save Addition reaction could take place between rosin and maleic anhydride. The rosin maleic adduct also could be bromized by liquid bromine. The molecular structures of rosin maleic adduct and its bromide were characterized by comparison with rosin and its bromide using their IR spectra. The thermal stabilities of rosin, rosin bromide, rosin maleic adduct and its bromide were studied by comprehensive thermal analyzer. The results showed that rosin and its adduct were easy to form bromides, and the thermal stabilities of bromides was decreased because of formation of weak C-Br bond. Related Articles | Metrics

综述

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Recent Developments and Prospect of Biomass Waste Conversion to Liquid Fuel Technology PENG Jin-xing;SHAO Qian-jun 2006, 40 (4):  53-56.  Abstract ( 690 )   PDF (741KB) ( 915 )   Save This article pointed out the feasibility and necessity of biomass waste conversion to liquid fuel technology. The techno-logy of biomass conversion to liquid fuel and its development in recent years are introduced. The views and recommendations of effective use of biomass waste are presented. Related Articles | Metrics

专题讲座

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Statement on Biomass Energy Standard System (I) ——Biodiesel Standardization Progress LIU Jun-li;JIANG Jian-chun 2006, 40 (4):  57-61.  Abstract ( 567 )   PDF (802KB) ( 1249 )   Save Biomass energy is a renewable clean energy. Focusing on biomass energy products and according to their different physical states, the national standardization system of biomass energy is proposed in the course series on the basis of investigation of the international standardization of major products. The progress of biodiesel standardization is reviewed in this paper. On the basis of analyzing the status of international biodiesel industry development, the main standards of biodiesel products in the world are introduced. The specifications of biodiesels from different countries are compared each other. It is suggested that the standard system of national biodiesel products should be established quickly according to the present situation of China biodiesel industry. The draft of biodiesel standards could be expedited by the way of adopting international standards. Related Articles | Metrics

研究报道

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Study on Protein Content in Pigeon Pea Leaves of Different Breeds and Individuals LIU Xiu-xian;LI Zheng-hong;DENG Jiang;GU Yong;GAN Jin 2006, 40 (4):  19-21.  Abstract ( 462 )   PDF (450KB) ( 971 )   Save The protein contents in leaves of pigeon pea (Cajanus cajan) of 22 breeds (including introduced breeds and domestic breeds) and different individuals of the two breeds collected from 3 different harvest seasons on Shuitang test-spot of Yuanyang County in Yunnan Province were analyzed. The research results showed that a significant difference of protein contents occurred between different breeds, and more significant differences of protein contents occurred between different harvest seasons or different individuals. The protein contents of leaves in different breeds were 17.65%-22.43%. The protein contents of leaves from different harvest seasons were 14.78%-23.97%. Y57-5 and Y43 were suitable to spread planting as protein feed resources, and autumn is the best season for harvest. In order to avoid intercross and keep the fine properties, the voile bag would be covered on the selected fine individual plant before blooming. Related Articles | Metrics

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Study on Adsorption Properties of Thiosemicarbazide-cellulose to Pb2+,Ni2+,Co2+ WANG Hong;WANG Jun 2006, 40 (4):  35-37.  Abstract ( 642 )   PDF (540KB) ( 999 )   Save The thiosemicarbazide-cellulose was prepared and its static adsorption properties such as capacities, kinetics and isotherm for Pb2+,Ni2+,Co2+ were studied. The factors to influence adsorption process were also investigated. The results indicated that the thiosemicarbazide-cellulose has selected adsorption property to Pb2+,Ni2+,Co2+. The adsorption isotherm approximately fit the Freundlich equation within the range of experimental concentration. The ion bond and the conjugant bond were formed between the thiosemicarbazide and Pb2+,Ni2+,Co2+. The chemical adsorption was dominant. Related Articles | Metrics

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Preparation of Activated Carbon from Bomboo by Potassium Hydroxide Method LIU Yue-rong 2006, 40 (4):  38-40.  Abstract ( 688 )   PDF (625KB) ( 946 )   Save Activated carbon with high quality was prepared from a forest waste of bamboo dust using potassium hydroxide as an activating agent. Effects of activation temperature, activation time, and impregnation time on adsorption of activated carbon were studied by orthogonal test. The optimum parameters for preparation of activated carbon were: 1:4 of the ratio of bamboo dust to potassium hydroxide solution, 1 h of impregnation time, 900℃ of activation temperature, and 90 min of activation time. The prepared activated carbon under the condition of optimum parameters had the structure of enormous micropore and its surface area was up to 2415 m2/g. Related Articles | Metrics

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Analysis of Disproportionated Rosin Composition by GC and UV Spectrophotometers PU Xiao-dong;WANG Lin-lin;CHEN Yue-yuan;SUN Wen-jing;CHEN Xiao-peng 2006, 40 (4):  7-10.  Abstract ( 951 )   PDF (1138KB) ( 1149 )   Save Prepared disproportionated rosin was analyzed by 1102 GC and UV spectrophotometer. It shows that the resin acids in disproportionated rosin can be determinated precisely and completely by GC. According to Chinese disproportionated rosin product standard ZB B 72002-1984, abietic acid and dehydroabietic acid in products were determinated by two different UV spectrophotometers. The width of slot is 0.1 nm. Abietic acid and dehydroabietic acid can be determinated correctly in some concentration range by UV spectrophotometer, the range of abietic acid is from 0.05%-4.88%,and the dehydroabietic acid is from 41.1%-50.9%. Related Articles | Metrics

技改园地

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Study on Recovery of Remaining Heat in the Production of Activated Carbon DU Jing-rong;FENG Zhao-xiang 2006, 40 (4):  44-46.  Abstract ( 672 )   PDF (498KB) ( 827 )   Save The remaining heat recovery method of smoke flue in the production of activated carbon by the multitube furnace was introduced.Steam was produced at the rate of 400 kg/h after remaining heat recovery and its amount was enough for the need of activated carbon production. Related Articles | Metrics

研究报道

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Studies on the Diels-Alder Reaction of Rosin with Acrylic Acid under Microwave Irradiation YAO Xing-dong;NIE Yuan-mei;LEI Fu-hou 2006, 40 (4):  25-27.  Abstract ( 526 )   PDF (630KB) ( 1030 )   Save The Diels-Alde addition reaction of rosin with acrylic acid under microwave irradiation has been investigated. The products have been verified with FT-IR,UV and HPLC. The results show microwave irradiation can effectively accelerate the reaction, which completed within 90 min for open system or 5 min for the sealed system in the addition reaction system of 35 g rosin with 7.2 mL acrylic acid. Acid values of the products under microwave irradiation are much higher than that with routine heating for 8 hours.Long reaction time and high temperature are favorable to increase of acid values of products in the normal heat method for preparation of acrylated rosin. The optimal microwave power is 640 W in microwave hest and pressure system. Excessive microwave power and long irradiation time are adverse to increase of acid values of products. Related Articles | Metrics

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Exploratory Research on Preparation of Activated Carbon from Yilan Coal for Decolorization WANG Zhi-gao;JIANG Jian-chun;DENG Xian-lun;CHANG Xia;ZHANG Yan-ping;LIU Han-chao 2006, 40 (4):  41-43.  Abstract ( 747 )   PDF (517KB) ( 936 )   Save Activated carbon with decolorization capability to caramel was prepared from Yilan coal by activation with water vapor. When the yields of carbonization and activation were respectively 74.0%-76.2% and below 14.0%, the adsorption properties of prepared activated carbon were: methylene blue 232.5 mg/g, decolorization to caramel B 80%, and better decolorization capability to colorful aqueous solution in comparison with reference material of activated carbon. Ash and other impurities in activated carbon could be reduced to meet the requirements for the decolorization of colorful aqueous solution by a simple and effective method. The activation technique and some problems occurred during activation process were discussed. It was found that the decolorization capability of prepared activated carbon was increased by prolonging activation time at activation temperature of 860℃, but the activation yield was reduced at the same time. Related Articles | Metrics

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Liquefaction of Two Desert Shrubs and FT-IR Analysis of Their Liquefied Products ZHANG Chen-xia;HUANG Jin-tian 2006, 40 (4):  15-18.  Abstract ( 634 )   PDF (743KB) ( 879 )   Save The liquefaction of two desert shrubs in the presence of phenol as liquefacient was studied in this paper. The unliquefied raw materals and liquefied products of Salix psammophila and Caragana microphylla were analyzed by FT-IR method. The experimental results showed that the liquefaction extent enhanced with the increase of liquefaction temperature, catalyst dosage, and liquid-solid ratio. In the condition of 150 ℃, 7% of catalyst dosage, 4 :1 of liquid-solid ratio, and 120 min of liquefaction time, the residue values of Salix psammophila and Caragana microphylla were 3.79%and 11.25%, respectively. Related Articles | Metrics

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Analysis of the Contents of Polyphenols and Flavonoids in Olive Leaf GAO Cai-xia;WANG Cheng-zhang;CHEN Wen-ying;JIANG Cheng-ying;QI Deng-chen 2006, 40 (4):  4-6.  Abstract ( 718 )   PDF (530KB) ( 1149 )   Save The analytical methods were established for polyphenols with catechin as standard contrast by Folin colorimetry and flavonoids with rutin as contrast,and the different factions on the contents of polyphenols and flavonoids were studied for tree age and dry style;The results showed that the contents of polyphenols and flavonoids in 3 year old olive leaf were more high than that in 20 year old olive leaf of and high temperation or sunlight can reduce their contents. The extract of olive leaf was purified by macroporous resin.The content of total polyphenols of purified extract was over 80%. Related Articles | Metrics

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Analysis of Chemical Components of the Volatile Oil of Pinus Prokoraiensis Needles CHENG Ying-ming;YAN Ji-chang;MIN Fan-xin 2006, 40 (4):  22-24.  Abstract ( 562 )   PDF (477KB) ( 935 )   Save The chemical components of the volatile oil of Pinus prokoraiensis needles were analyzed by GC/MS. There are eighty-eight peaks of compounds separated on the gas chromatograph, and identified by MS database. Fifty-two compounds, mainly including monoterpenes and sesquiterpenes, and small ambuuts of alcohols, esters, aldehydes, ketones, and phenols derivated from terpenes, had the relative content of over 0.1%. Pinus prokoraiensis was verified as a new species of plant by comparing the chemical components of volatile oil of Pinus prokoraiensis with that of Pinus koraiensis. Related Articles | Metrics

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Microwave Assisted Extraction of Flavonoids from Waxbeery Flesh DONG Liang-yun;DONG Chuan-wan;YAN Qiang;CAI Qi-xiong;WANG Yi-xing 2006, 40 (4):  31-34.  Abstract ( 474 )   PDF (705KB) ( 958 )   Save The extraction condition of flavonoids from waxberry flesh by ethanol at assistance of microwave was studied. The single-factor experiments on effects of ethanol concentration, solid-liquid ratio, microwave power and irradiation time were conducted at first. The optimal extraction condition was obtained lately by orthogonal test. The results showed that the extraction yield of flavonoids was up to the top value of 3.45% in the condition of 60.0% ethanol, 1:40 of solid-liquid ratio, low rank of microwave power, and 4.0 min of irradiation time. Comparing with traditional technique, the irradiation extraction time decreased dramatically and extraction yield increased markedly. Related Articles | Metrics

综述

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Research and Development of Biomass Gasification Technique for Power Generation in China LIU Bao-liang;JIANG Jian-chun 2006, 40 (4):  47-52.  Abstract ( 701 )   PDF (1185KB) ( 1067 )   Save The biomass energy was given more and more attention because of its characteristics of cleanness and no pollution. Development of new utilization of biomass energy had been an important focus currently. The biomass gasification for power generation was one of new techniques for utilization of biomass energy. The development and application of biomass gasification technique for power generation were mainly introduced in this paper. Some problems occurred in biomass gasification for power generation and their resolution methods were also discussed. The economic status of power generation from biomass was analyzed and the application prospect of power generation from biomass was predicted. Related Articles | Metrics

研究报道

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Study on Inhibition Effects of the Degraded Black Wattle Tannin on Microorganisms LI Dong-sheng;ZHANG Li-ping;PU Jun-wen 2006, 40 (4):  11-14.  Abstract ( 657 )   PDF (907KB) ( 842 )   Save A new method is studied to degrade the black wattle tannin.The degraded product, which has an average molecular weight of 980, has a excellent inhibition effect compared to the black wattle tannin before degradation on Escherichia coli, Bacillus subtilis, Staphylococcus, Bacillus megaterium and Shigella dysenteriae. The minimum inhibition concentrations to the microorganisms above are 0.05%, 0.03%, 0.03%, 0.03%and 0.05%,respectively. Related Articles | Metrics