检索结果-南通市图书馆

Agricultural Science & Technology 2020年第2期21卷 41-46页

作者： PAN Hui-qing ZHANG Zhao-kun ZHANG Yan-da LIU Han-ru YUAN Ji-duan ZHAO Qi Municipal Enterprise Technical Center of Fujian Beidi Pharmaceutical Co. Ltd.Ningde 355300PRC Henan Zhengdaoqibao Environmental Protection Technlology Co. Ltd.Hebi 458000PRC School of Pharmacy Sciences Southwest UniversityChongqing 400715PRC Zherong County Pharmaceutical Development Bureau Ningde 355300PRC Fujian Ningde Beidi Bio-technology Co. LtdNingde 355300PRC

【Objective】To optimize the steam explosion process condition for extracting polysaccharides from Pseudostellaria heterophylla.【Method】The effects of steam pressure,pressure-maintaining time and material moisture content on the extraction of polysaccharides from Pseudostellaria heterophylla were studied by response surface methodology based on Box-Behnken design.【Result】The findings showed that each factor could significantly affect the test index,and the optimum condition was as follows:steam pressure 1.50 Mpa,pressuremaintaining time 46 s and material moisture content 46%.Under this condition,the verified experimental value of polysaccharides from Pseudostellaria heterophylla was 39.32%,indicating a relative standard deviation of 2.73%from the predictive ***,scanning electron microcopy(SEM)images showed that the surface physical structure of Pseudostellaria heterophylla was irregularly broken and cracked,which means the physical structure of Pseudostellaria heterophylla was changed and destroyed at the cellular level.【Conclusion】This experiment provides a new approach for the extraction of polysaccharides from Pseudostellaria heterophylla,as well as a reference for the resource utilization of Pseudostellaria heterophylla.

关键词： Pseudostellaria heterophylla Polysaccharides Extraction technology steam explosion Response surface optimization

Effects of Rice Straw steam-explosion Spent Liquor on the Growth of Cabbage Seedlings

在线全文

学校读者我要写书评

暂无评论

Paper And Biomaterials 2023年第2期8卷 78-86页

作者： Bo Jiang Huan Jiao Xinyu Guo Yu Zhang Yanguang Zhang Yongcan Jin Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Light Industry and Food EngineeringNanjing Forestry UniversityNanjingJiangsu Province210037China

The direct use of spent liquor from pulping and papermaking engineering,which is abundant in active organic matter,can avoid resource wastage and environmental *** this study,the effects of soaking solution and filtrate from steam-exploded rice straw on seed germination and the early development of cabbage were *** results have shown that soaking solution and filtrate stimulated early cabbage growth at low *** germination potential and the rate of soaking solution-treated cabbage seeds increased by 8%and 5%,respectively;meanwhile,that of the filtrate-treated cabbage seeds increased by 11%and 5%,*** of root growth by steam-exploded rice straw spent liquor was expressed in lateral root *** fresh weight of cabbage seedlings treated with the soaking solution/filtrate increased by more than 50%and the dry weight over 20%.Comparatively,the stimulation of filtrate on seed germination and early development of cabbage is superior to that of the soaking ***-exploded rice straw spent liquor is rich in bioactive lignin and oligosaccharides,which makes it a promising biostimulant for promoting crop growth.

关键词： rice straw steam explosion spent liquor cabbage seedlings stimulation

Effect of steam-pretreatment combined with hydrogen peroxide on lignocellulosic agricultural wastes for bioethanol production：Analysis of derived sugars and other by-products

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第2期27卷 535-543页

作者： Alessandra Verardi Alessandro Blasi Tiziana Marino Antonio Molino Vincenza Calabrò Laboratory of Transport Phenomena and Biotechnology Department of Computer Engineering Modeling Electronics and Systems Science (DIMES) University of Calabria Via Pietro Bucci Cube 39/A 1st Floor 1-87036 Arcavacata di Rende Cosenza (CS) Italy ENFA Italian National Agency for New Technologies Energy and Sustainable Economic Development CR Trisaia S.S. 106 lonica km 419+500-75026 Rotondella Matera (MT) Italy Institute on Membrane Technology ITM-CNR Via P. Bucci Cuba 17/c 1-87036 Arcavacata di Rende CS Italy ENEA. Italian National Agency for New Technologies Energy and Sustainable Economic Development CR Portici P.. Enrico Fermi 1 80055 Portici NA Italy

The hydrogen peroxide, a green impregnating agent suitable for lignocellulosic biomass to bioethanol process, was used to pretreat sugarcane bagasse by steam explosion. Two different concentrations of hydrogen peroxide（0.2% and 1%） were investigated. Then, the biomass was hydrolyzed after pretreatment using cellulase. The amount released of：（i） cellobiose;（ii） monosaccharides, as glucose, xylose, arabinose and mannose and（iii） lignocellulose derived by-products, as furans and small organic acids（acetic, formic,and levulinic acid）, was evaluated in the hydrolysate samples, previously pretreated both in the presence and absence of impregnating agent. By adding of hydrogen peroxide in steam-pretreatment, the average yield increase was 12% for glucose and as high as 34% for xylose, and cellobiose yield was decreased of about 30%. No significant increase has been observed in arabinose and mannose yield. Furthermore,the hydrogen peroxide seems not increased the formation of lignocellulose derived by-products during pretreatment process, with the exception of the levulinic acid.

关键词： Lignocellulose Hydrogen peroxide steam explosion Enzymatic hydrolysis Bioethanol

Factors affecting the quality of biomass pellet for biofuel and energy analysis of pelleting process

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2013年第2期6卷 1-12页

作者： Phani K.Adapa Lope G.Tabil Greg J.Schoenau Department of Chemical and Biological Engineering University of SaskatchewanSaskatoonS7N 5A9 SKCanada Department of Mechanical Engineering University of SaskatchewanSaskatoonS7N 5A9 SKCanada

Agricultural biomass residue such as barley,canola,oat and wheat straw has the potential to be used for sustainable production of bio-fuels and offset greenhouse gas *** biomass substrate must be processed and handled in an efficient manner in order to reduce industry’s operational cost as well as meet the requirement of raw material for biofuel *** has low bulk density,making it difficult and costly to store and transport in its native loose ***,in this study,an integrated approach to densification of non-treated and steam exploded barley,canola,oat and wheat straw was *** this process,the significance of major contributing factors(independent variables such as biomass type,treatment,pressure and grind size)on pellet density,durability and specific energy were *** has been found that applied pressure(60.4%)was the most significant factor affecting pellet density followed by the application of steam explosion pre-treatment(39.4%)for lab-scale single pelleting ***,the type of biomass(47.1%)is the most significant factor affecting durability followed by the application of pre-treatment(38.2%)and grind size(14.6%)for pellets manufactured using the pilot-scale pellet ***,applied pressure(58.3%)was the most significant factor affecting specific energy required to manufacture pellets followed by the biomass(15.3%),pre-treatment(13.3%)and grind size(13.2%),which had lower but similar effect on specific energy for lab-scale single pelleting *** energy analysis of post-harvest processing and densification of agricultural straw was performed,which showed that a significant portion of original agricultural biomass energy(89%-94%)is available for the production of ***,similar amount of specific energy is required to produce pellets from barley,canola,oat and wheat straw *** pellets having steam exploded straw required more energy to manufacture resulting

关键词： biofuel biomass steam explosion pretreatment pelleting specific energy barley straw canola straw oat straw wheat straw

steam Exploded Peanut Shell Fiber as the Filler in the Rigid Polyurethane Foams

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第11期7卷 1077-1091页

作者： Zehui Ju Qian He Tianyi Zhan Haiyang Zhang Lin Sun Lu Hong Xinyi Shi Xiaoning Lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Biology and the Environment Nanjing Forestry UniversityNanjing210037China.

In this study,steam exploded peanut shell fibers(SE-PSFs)were utilized to fabricate with rigid polyurethane foam(RPUF)in order to improve sound absorption performance and hydrothermal weather *** method of SE treatment,RPUF preparation and flame retardant treatment were selected to prepare SE-PSF/RPUF composites in this *** and mechanical properties including density,water absorption capacity,thickness swelling rate,compressive strength,thermal conductivity and average sound absorption coefficient of SE-PSF/RPUF were investigated and compared with the control(PRUF).The results showed that the density,water absorption capacity,thickness swelling rate and thermal conductivity showed an increasing trend with the increase of SE-PSFs *** strength of the composite material showed a downward trend with the increase of the SE-PSFs *** average sound absorption coefficient of the SE-PSFs/RPUF compared with PRUF significant increased,and the average sound absorption coefficient of the SE-PSFs/RPUF with SE-PSFs 40%was *** study getted the best ratio of flame retardants for 10%EG and 3%*** oxygen index was 35.56 vol%.

关键词： steam explosion peanut shell fiber polyurethane composite flame retardant properties

Synthesis and Characterization of a Novel Cellulose Nonionic Ether

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2005年第2期14卷 188-191页

作者：邵自强徐坤田永生王飞俊王继勋 School of Material Science and Engineering Beijing Institute of Technology Beijing100081 China School

A kind of novel cellulose ether-trihydroxybutyl cellulose (THBC) was synthesized. The process includes the steam explosion treatment of cotton cellulose, alkalization, etherification and purification. Sweep electron microscope (SEM), Fourier transform infrared (FTIR) and X-ray diffraction were used to characterize the cellulose pretreated and the product. The effects of reaction conditions (temperature, time) on the molecular substitution (S_m) were discussed. To obtain a higher degree of molecular substitution, the reaction temperature is 80 ℃, and the reaction time is 4 h.

关键词： steam explosion trihydroxybutyl cellulose thermoplastic 3,4-epoxy-1-bromo-2-butyl alcohol

Structure, composition and enzymatic hydrolysis of steam-exploded lespedeza stalks

在线全文

学校读者我要写书评

暂无评论

Forestry Studies in China 2007年第2期9卷 137-141页

作者： Wang Kun Wang Fang Jiang Jian-xin Zhu Li-wei Fan Hong-zhuai College of Materials Science and Technology Beijing Forestry University Beijing 100083 P. R. China

Pretreatment of lespedeza stalks by steam explosion has been studied. The results indicate that steam-exploded pretreatment has strong effects on physical features, morphology, crystallinity, and composition of lespedeza stalks as shown by scanning electron microscopy （SEM）, infrared （IR）, and X-ray diffraction spectrometry methods. After steam explosion, the cellulose and lignin contents of lespedeza stalks varied only slightly, but the hemicellulose content had decreased from 29.34% to 7.48%. The cellulose obtained by steam-exploded pretreatment had a higher degree of crystallinity than that of the raw material. At the explosion condition of 2.25 MPa and 4 min, lignocellulose is easier to hydrolyze by enzyme than the original lignocellulose. The concentration of reduced sugar in the hydrolyzate liquid increased from 71.77 to 162.84 g·L^-1.

关键词： steam explosion lespedeza stalks structure composition enzymatic hydrolysis

Structure and Property of Bamboo Fiber

在线全文

学校读者我要写书评

暂无评论

Chinese Forestry Science and Technology 2008年第2期7卷 7-14页

作者： JIANG Jianxin1 YANG Zhongkai2 ZHU Liwei1 SHI Limin2 YAN Lijie1 1. College of Materials Science and Technology, Beijing Forestry University, Beijing100083, P. R. China 2 .Beijing Municipal Key Laboratory of Clothing Materials R & D and Assessment, Beijing Institute of Clothing Technology, Beijing 100029, P. R. China.

The chemical composition, fiber characteristics, crystalline structure, mechanical properties and thermal behavior of the five species of bamboo (Phyllostachys edulis ***, Bambusa tootisk, Arundinaia amabilis, *** cv. Vittata, and Dendrocalamus affinis) were studied with IR, X-ray, DSC and chemical analyses. The results indicated that the benzene-ethanol extractive content of bamboo was higher than that of wood, the content of lignin and the content of pentosan were 19.1% - 25.3% and 14.9% - 22.6%, respectively. Except for Ph. edulis cv. Pachyloe, the cellulose content in the other 4 species was over 50%. The average length of fiber of D. affinis was the longest (1.861 mm). The length/ width ratio of bamboo fiber was also higher than that of wood, and it was the highest for ***, which reached 142. The results of IR and X-ray confirmed that crystalline structure of bamboo fibers was cellulose, and A. amabilis had the highest crystallinity index. The differential thermal analysis (DSC) can be one of the methods to identify various fiber materials. After steam explosive pretreatment, cellulose content of D. affinis had increased from 50.5% to 69.2%, the crystallinity index had increased and the breaking tenacity of bamboo fibers was suitable for producing textile products, indicating that steam explosion is an useful pretreatment for bamboo fibers made into composite materials and textiles.

关键词： bamboo fiber structure property steam explosion

Study of the Effect of Different Solids Load on the Optimum pH during Enzymatic Hydrolysis of steam Exploded Corn Stover

在线全文

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2011年第10期5卷 880-889页

作者： Rodolfo A. Romero Bertil Stromberg Anita Locke Biochemical Technology Andritz Inc. Glens Falls NY USA

The understanding of enzymatic saccharification of pretreated lignocellulosic material is of great importance. There are several important commercially available enzymes in the market that are used for this purpose. The conditions of pH and temperature performance of any particular enzyme are very well defined and it is clearly indicated by its manufacturer and it depends on the type of enzyme or enzymes in the complex pool. It is well know that commercial cellulases work best at pH around 4.8-5.0 and as a consequence this is widely used in the industry and the literature. In this study it was found that optimum pH of cellulases is different than that recommended by its manufacturer at higher solids load saccharification. The optimum pH changes depending on the consistency or solids loads of the matrix where the enzyme is acting upon. steam exploded corn stover was tested with cellulases and xylanases at different pH, consistencies and ionic strength. Results showed that the optimum pH at lower consistency （1% w/w） is the same as the one recommended by the manufacturer and in the literature; however at higher consistency the value obtained was higher （pH 5.5 to pH 6.5） instead ofpH 4.8. The difference could represent up to 30-50% higher yields and hence of great importance for the economics of second generation fuel production. An explanation of this behavior could be associated with the Donnan effect theory. This effect indicates that the presence of charged groups in the fiber matrix creates a pH gradient within the slurry. If the charged groups are negatively charged this would create a local or internal pH lower than the surrounding liquid pH. This could explain why by reducing the concentration of H^＋ higher enzymatic conversion yields were observed.

关键词： Enzyme optimum pH Donnan effect steam explosion cellulose hydrolysis corn stover biofuel