被引排行
Comparison of Compression and Distillation Processes for Essential Oils Extraction from Citrus
XIE Lian-wu~(1), GUO Ya-ping~(1),ZHOU Chun-shan~(1), ZHOU Jin-hua~(1,2)(1.School of Chemistry and Chemical Engineering, Central South University, Changsha 410083,China;2. School of Science, Central South Forestry University, Zhuzhou 412006,China )In order to identify a continuous process for essential oils extraction from citrus with the characters of low-cost, low resource-consuming and high efficiency, compression process is used in the essential oils extraction from citrus by compared with distillation process. The study result shows that the recovery of transparent essential oils by distillation process is 1.2%～2.1%, and the smaller granularity and the more additive ammonium chloride, the bigger the recovery. In contrast to this,the recovery of flaxen essential oils by compression process is lower as 1.0%～1.6%, but its odor is as better as close to the fragrance of natural fresh citrus. Therefore, compression process is fit for large-scale continuous citrus essential oils produce.
Research Progress on Preparation Methods and Applications of Activated Carbon
SUN Long-mei;ZHANG Li-ping;XUE Jian-hua;LI Bing-zheng;Activated carbon with large specific surface area,developed pore structure,high adsorption efficiency and good chemical stability has attracting extensive attentions.There are two main steps of preparing activated carbon:carbonization and activation,and activation includes three methods,i.e.,physical activation method,chemical activation method and physico-chemical activation method.In this paper,the performances of activated carbon prepared with different activators and different methods are compared,the advantages and disadvantages of the various activation methods are analyzed,and the future research directions of the preparation of activated carbon are predicted.
The Main Chemical Constituents and Pharmacological Activities of Cornus Officinalis Sieb.et Zucc
YUAN Ju-li1,JIANG Hong-bo2(1.Shanxi Province Key Laboratory of Phytochemistry,Baoji University of Arts and Sciences,Baoji 721013,China;2.Key Laboratory of Disaster Monitoring and Mechanism Simulating,Baoji University of Arts and Sciences,Baoji 721013,China)Cornus officinalis Sieb.et Zucc,as one of the three most valuable medicinal plants in the world,has antibacterial,immune regulation,lowering blood sugar and blood lipid,antioxidative,anticancer,anti AIDS,cardiac and other important medicinal values.This article focuses on the chemical constituents of Cornus officinalis Sieb.et Zucc and its pharmacological activities.
Research and Development of Hindered Phenolic Antioxidants
WANG Jun, YANG Hong-jun, LI Cui-qin(Daqing Petroleum Institute, Daqing 163318,China)In this article, the current progress of hindered phenolic antioxidants, its classification, mechanism of action, influence factor on efficiency and mechanism of discoloration are reviewed. In the end, typical products of phenolic antioxidant are introduced and the developing trend of hindered phenolic antioxidants in the future have also been presented.
The Experimental Study of Adsorption-Photocatalytic Oxidation of Formaldehyde with ACF and TiO_2
HU Jiang-jun, LI Ying-liu, PENG Wei-hua (School of Resource and Environmental Science, Wuhan University, Wuhan 430072, China)TiO2 was used as a photocatalyst and activated carbon fibres that supported TiO2 as an adsorbent to decontaminate formaldehyde gas of low concentration.The photocatalyst was prepared by sol-gel technique and modified with Fe3+and so it got a higher activity. Activated carbon fibres loaded with TiO2 was exposed to UV light with the result that formaldehyde gas was adsorbed by ACF and then photocatalytic oxidized into CO2 and H_2O. In the experiment, effects of reaction time, does of titanium dioxide and formaldehyde concentration have been studied, and the adsorption capability of ACF used in photocatalytic oxidation was also tested.
Development of Studying on Electrochemical Methods in Treating Wastewater
CHEN Wu,LI Fan xiu,MEI Ping (Department of Chemical Engineering,Jianghan Petrolem Institute,Jingzhou 434102,China)The article briefly introduces several electrochemical methods frequentely applied to wastewater treatment and its application,emphasizing the feature,classification and application of the three dimension electrode as well as the development of studying on mechanism in processing wastewater;putting forward the existing problem of using three dimension electrode to process wastewater;forecasting the applying prospect of three dimension electrode.
Research Progress in Cellulase Excreted from Biology
LIU Jie-li,WANG Jing (Faculty of Chemical Science and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)Cellulase is the most effective catalyst in degradation of cellulose.In the natural world there are many types of biological production of cellulase.This paper summarizes the cellulase in a variety of categories,clan,structure;cellulase produced by protozoa,epigenetic animals, and microbial strains (such as bacteria,fungi,actinomycetes,etc);cellulase coding genes and their expression;mechanisms of cellulase.Advices on forward research trend and focus are also mentioned.
Study on Antioxidant Activity of Ganoderma Lucidum Polysaccharide
ZHANG Zhi-jun,LI Shu-fang,WEI Xue-sheng,CHEN Xiao-ming(The Forestry and Fruits Institute of Tianjin,Tianjin 300112,China)Reduction ability of Ganoderma lucidum polysaccharide was determinated by the reduction method of potassium ferricyanide,and its scavenging ability for free radicals ·OH and ·O-2 were studied.The results showed that Ganoderma lucidum polysaccharide had reduction activity and scavenging ability for free radicals,and the dose-effect relationship of the scavenging ability and polysaccharide concentration exhibited certain positive correlation.
Study on Performance of Anaerobic Digestion for Treating Municipal Solid Waste at Different Temperature
WU Man-chang,SUN Ke-wei,LI Ru-yan,SUN Yan,ZHANG Hai-dong (National Engineering Research Center of Solid Waste Resource Recovery , Kunming University of Science and Technology, Kunming 650033, China)The influence of different temperature on performance of anaerobic fermentation was studied. The parameters adopted for evaluation were biogas production、fermentation starting time and the proportions between solid/water during the digestion process under different temperature. The evaluation of sudden change of temperature affecting the fermentation process were studied too. The result indicated that the optimum temperature for MSW anaerobic fermentation was 55℃. The organic solid waste were degraded very well and the methane concentration in biogas were comparatively high during 55℃.