硫酸盐类型对杨木燃料乙醇蒸馏废水厌氧消化特性的影响
作者:
邓萍萍;闫晓帆;刘瑞霞;丁婷婷;陈介南;...
期刊:
应用化工 ,2022年51(6):1592-1597 ISSN:1671-3206
作者机构:
[闫晓帆; 丁婷婷; 吴志平; 刘瑞霞; 陈介南; 邓萍萍] 中南林业科技大学材料科学与工程学院
关键词:
杨木燃料乙醇蒸馏废水;厌氧消化;硫酸盐类型;产甲烷性能;硫平衡
摘要:
杨木燃料乙醇蒸馏废水按照COD/SO_4~(2-) = 20的量,添加Fe_2 (SO_4)_3、FeSO_4、Na_2 SO_4,厌氧消化周期为18 d。探究硫酸盐类型对废水中温厌氧消化的影响。结果表明,添加Fe_2 (SO_4)_3的产甲烷量最高为543.0 mL/g VS,比添加FeSO_4和Na_2 SO_4分别提高了29.72%和35.82%。添加Fe_2 (SO_4)_3的挥发性脂肪酸含量最高,Fe~(3+)可以富集异化铁还原菌,从而提高乙酸含量,为产甲烷菌提供更多基质。硫元素平衡分析结果,Fe_2 (SO_4)_3-PFEW厌氧发酵结束后,沼液中硫化物含量最低,说明铁源的添加促进了体系中的硫化物与金属元素结合,进而固定。因此,Fe_2 (SO_4)_3的添加能够提高厌氧消化性能,同时降低硫化物的含量。
语种:
中文
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Insights into the synergistic effect of active centers over ZnMg/SBA-15 catalysts in direct synthesis of butadiene from ethanol
作者:
Wang, Kangzhou;Peng, Xiaobo;Gao, Xinhua;Araki, Yuya;Zhao, Heng;...
期刊:
REACTION CHEMISTRY & ENGINEERING ,2021年6(3):548-558 ISSN:2058-9883
通讯作者:
Xiaobo Peng<&wdkj&>Guohui Yang<&wdkj&>Noritatsu Tsubaki
作者机构:
[Xiao, Liwei; Wang, Kangzhou; Araki, Yuya; Liang, Jiaming; Tsubaki, Noritatsu; Zhao, Heng; Yang, Guohui; Peng, Xiaobo] Univ Toyama, Grad Sch Engn, Dept Appl Chem, Gofuku 3190, Toyama 9308555, Japan.;[Gao, Xinhua] Ningxia Univ, Fac Chem & Chem Engn, State Key Lab High Efficiency Utilizat Coal & Gre, Yinchuan 750021, Ningxia, Peoples R China.;[Chen, Jienan] Cent South Univ Forestry & Technol, Minist Forestry, Sch Mat Sci & Engn, Bioethanol Res Ctr, Changsha 410004, Peoples R China.;[Liu, Guangbo; Wu, Jinhu] Chinese Acad Sci, Qingdao Inst Biomass Energy & Bioproc Technol, Qingdao 266101, Peoples R China.
通讯机构:
[Xiaobo Peng; Guohui Yang; Noritatsu Tsubaki] D;Department of Applied Chemistry, Graduate School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
摘要:
Functionalized catalysts with multiple active centers have been studied in direct conversion of ethanol to butadiene (ETB). However, it is still a considerable challenge to control the synergistic effect of multiple active centers. Here, we report that a series of ZnMg/SBA-15-based catalysts were synthesized for the direct ETB process. The non-polar solvent n-hexane is utilized to improve the synergistic effects of ZnO, MgO and SBA-15. The characterization results demonstrate that the ZnMg/SBA-15-hexane catalyst, prepared from n-hexane solvent, can increase dehydrogenation activity and promote synergistic catalysis. The direct ETB performance reveals that it exhibits an excellent selectivity of 70% towards the butadiene product. Further, our in situ DRIFTS analysis indicates that aldol condensation and the MPV reaction are the rate-determining steps of the direct ETB process. The present work offers a simple strategy to optimize synergies of multiple active centers.
语种:
英文
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杨木浆板制备高取代度低粘度羧甲基纤维素钠的工艺研究
作者:
陈惠芳;蒋新元;孟浩亮;陈介南;许琼文
期刊:
应用化工 ,2019年48(7):1587-1591 ISSN:1671-3206
作者机构:
中南林业科技大学 材料科学与工程学院,湖南 长沙,410004;中南林业科技大学 材料科学与工程学院,湖南 长沙 410004;湖南省木本生物质转化工程技术研究中心,湖南 长沙 410004;[许琼文; 孟浩亮; 陈惠芳; 陈介南; 蒋新元] 中南林业科技大学
关键词:
木质纤维素;羧甲基纤维素钠;碱化;醚化;取代度
摘要:
以杨木浆板纤维素为原料,通过单因素实验和正交实验,采取预处理工艺和三次碱化两次醚化工艺,并采用超声波和高速剪切分散等辅助手段,制备高取代度羧甲基木质纤维素钠。结果表明,预处理工艺: 70 ℃下用10% NaOH溶液(固液比1∶ 40 g/mL)浸泡搅拌90 min;碱化醚化工艺:室温下首次碱化时间为60 min, 50 ℃下第二次碱化和首次醚化反应时间为30 min,最后在70 ℃下第三次碱化和第二次醚化反应时间为90 min,氯乙酸钠用量∶ NaOH用量∶碱化纤维素用量=1. 4 ∶ 1 ∶ 1 (质量比);经过预处理和三次碱化两次醚化,产品取代度达到1. 33,黏度为404. 0 mPa·s。在碱化醚化过程中,在室温碱化后用高速剪切分散处理10 min(A档),第一次醚化后用超声波处理10 min(49 kHz,功率99%),最终产品的取代度由1. 33升高到1. 48,但黏度由404. 0 mPa·s下降到181. 9 mPa·s。
语种:
中文
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Obtaining nanofibers from lignocellulosic residues after bioethanol production
作者:
Liu, Liu;Sun, Xiaojun;Zhang, Lin;Qing, Yan* ;Yan, Ning;...
期刊:
Cellulose ,2019年26(6):3725-3734 ISSN:0969-0239
通讯作者:
Qing, Yan;Wu, Yiqiang
作者机构:
[Wu, Yiqiang; Sun, Xiaojun; Liu, Liu; Chen, Jienan; Yan, Ning; Zhang, Lin; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;[Qing, Yan; Wu, Yiqiang] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Qing, Y; Wu, YQ] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词:
Biomass residues;Nanofiber;Mechanical nanofibrillation;Energy storage
摘要:
Abstract: With wide use of biomass in various industries and enterprises, large amounts of biomass waste are being produced. This causes severe environmental issues and inadequate utilization of renewable resources. In this work, a sustainable and green process approach is proposed to utilize lignocellulosic biomass residues from biofuel conversion proceeding via direct mechanical treatments. The obtained nanofibers containing cellulose, lignin, and hemicellulose were directly isolated from lignocellulosic biomass residues and had diameters of approximately 21nm. After being treated via ultra-micro grinding for 0.5h with a millstone gap of approximately 5μm, and undergoing ultrasonication for 20min at 1000W as well as high-pressure homogenization shearing for 15 times in a chamber with 87μm diameter, partially hydrogen and covalent bonds between cellulose, lignin, and hemicellulose chains could be broken down. Lignin and hemicellulose were wrapped around the cellulose bundles, thus the residue nanofiber aerogels became easy to redisperse and redry in water. Additionally, the specific capacitance of carbonized nanofiber aerogels was up to 73.2Fg−1 at a current density of 1Ag−1. A remarkable reduction of specific capacitance happened along with the fermentation process prolongation and which is mainly related to the fermentation degree. With characteristics, such as special composite texture, high specific surface area, and excellent electrochemical performances, lignocellulosic biomass residue nanofibers displayed positive attributes in terms of energy storage and nanomaterials. Graphical abstract: [Figure not available: see fulltext.]. © 2019, Springer Nature B.V.
语种:
英文
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不同介质溶液对维生素C稳定性的影响研究
作者:
陈惠芳;蒋新元;陈介南;许琼文;孟浩亮
期刊:
日用化学工业 ,2018年48(8):444-449 ISSN:1001-1803
作者机构:
中南林业科技大学材料科学与工程学院, 湖南, 长沙, 410004;湖南省木本生物质转化工程技术研究中心, 湖南省木本生物质转化工程技术研究中心, 湖南, 长沙, 410004;[陈惠芳; 蒋新元; 许琼文; 孟浩亮] 中南林业科技大学材料科学与工程学院, 湖南, 长沙, 410004;[陈介南] 中南林业科技大学材料科学与工程学院, 湖南, 长沙, 410004 湖南省木本生物质转化工程技术研究中心, 湖南省木本生物质转化工程技术研究中心, 湖南, 长沙, 410004
关键词:
化妆品;维生素C;紫外分光光度法;介质溶液;稳定性;溶氧量
摘要:
利用紫外分光光度法研究了无机盐、羧甲基纤维素钠、β-环糊精和聚乙二醇等介质溶液中维生素C的稳定性,并探索了上述介质溶液延缓维生素C被氧化的作用机理。结果表明,氯化镁、氯化钾、氯化钠、羧甲基纤维素钠均能较显著地提高维生素C的稳定性,而羧甲基纤维素钠对人体安全、使用量很少且效果显著,可广泛应用在化妆品、食品、医药等领域用以保护维生素C的稳定性。聚乙二醇、β-环糊精与维生素C的混合溶液中起始溶氧量与空白维生素C溶液相近且随时间延长下降很明显,而氯化钠、羧甲基纤维素钠和维生素C的混合溶液中起始溶氧量则远低于空白维生素C溶液并随时间延长下降很慢,这些现象与上述介质对维生素C的保护效果是一致的。介质溶液中起始溶氧量的高低及下降速度快慢影响了维生素C的稳定性,无机盐离子种类和浓度影响溶液中溶氧量,而羧甲基纤维素钠、聚乙二醇、β-环糊精等溶液的相对黏度则对溶氧量存在影响。
语种:
中文
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纤维乙醇发酵残渣中酶解木质素的提取与表征
作者:
潘奇;陈介南;张新民;詹鹏;张林
期刊:
化工进展 ,2015年34(1):86-90,159 ISSN:1000-6613
作者机构:
[潘奇; 陈介南; 詹鹏; 张林] 中南林业科技大学;[张新民] 中南林业科技大学材料科学与工程学院
关键词:
发酵残渣;酶解木质素;木质纤维;结构表征;纤维乙醇
摘要:
近年来,将纤维素乙醇生产过程中所产生的废物进行资源化利用已越来越受重视。本研究利用杨木纤维酶解发酵产纤维素乙醇的残渣进行木质素的提取与表征,采用单因素试验分析碱浓度、料液比、反应温度、反应时间对酶解木质素提取效果的影响,并对反应条件进行正交优化,应用UV、FT-IR光谱仪对分离出的酶解木质素结构进行表征。结果表明:酶解木质素最佳的提取工艺条件为NaOH浓度40g/L、料液比1∶30、反应温度60℃、反应时间2.5h。紫外和红外光谱显示酶解木质素保留了完好的木质素结构,以紫丁香基木质素为主,有良好的化学活性。
语种:
中文
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