Journal of The Chinese Institute of Chemical Engineers最新文献_第9页

Effects of micropore development on the physicochemical properties of KOH-activated carbons 微孔发育对koh活性炭理化性质的影响

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.005

Ru-Ling Tseng , Szu-Kung Tseng , Feng-Chin Wu , Chi-Chang Hu , Chen-Ching Wang

{"title":"Effects of micropore development on the physicochemical properties of KOH-activated carbons","authors":"Ru-Ling Tseng , Szu-Kung Tseng , Feng-Chin Wu , Chi-Chang Hu , Chen-Ching Wang","doi":"10.1016/j.jcice.2007.11.005","DOIUrl":"10.1016/j.jcice.2007.11.005","url":null,"abstract":"<div>Effects of micropore development through varying the KOH/char ratio on the porous, electrochemical, electronic, and adsorptive properties for corncob-derived activated carbons (ACs) prepared by means of the KOH activation method were systematically compared. The pore properties of ACs, including BET surface area, total pore volume, micropore volume ratio, bulk density, and product yield based on the raw material were investigated to gain an understanding for the influence of KOH dosage on the pore development. Element analysis and temperature-programming desorption (TPD) were used to obtain the information of chemical composition and surface oxygen functional groups on ACs in order to propose the reaction mechanism of KOH activation. Based on the pore development, KOH-activated carbons can be classified into two groups: a combination of physical activation and chemical KOH etching at low KOH/char ratios (0.5–2) as well as chemically uniform etching at high KOH/char ratios (≥3.0). From the adsorption study for five organics with molecular weights varying from 129 to 466g/mol, the specific adsorption capacity of ACs for organics is independent of their specific surface area. The specific capacitance of ACs reached a maximum as the KOH/char ratio was equal to 3, attributed to a compromise between the specific surface area and electronic resistance of ACs.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2007.11.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79140238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 66

Effect of culture pH on the antioxidant properties of Antrodia camphorata in submerged culture 培养液pH对樟芝深层培养抗氧化性能的影响

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.04.010

Chin-Hang Shu, Ming-Yeou Lung

{"title":"Effect of culture pH on the antioxidant properties of Antrodia camphorata in submerged culture","authors":"Chin-Hang Shu, Ming-Yeou Lung","doi":"10.1016/j.jcice.2007.04.010","DOIUrl":"10.1016/j.jcice.2007.04.010","url":null,"abstract":"<div>Effects of culture pH ranging from pH 3.0 to 6.0 on yields of bioactive compounds, antioxidant activity, and free radical scavenging ability of methanolic extracts from mycelia and filtrates of Antrodia camphorata in a submerged culture were investigated. Culture pH significantly affected antioxidant and scavenging free radical activities of both the methanolic extracts of the mycelia and the filtrates. A low culture pH (3.0) favored cell growth, but higher culture pH (5.0) favored antioxidant properties. Antioxidant activities of the methanolic extracts of the mycelia and the filtrates were found to be correlated with total phenolic content, polysaccharide content, and protein/polysaccharide ratios. Antioxidant production was maximum at pH 5.0 at which the total phenolics and polysaccharide/protein ratio in the methanolic extracts of the mycelia were 152.2mg/g and 0.335, respectively. The total phenolics might be the compounds responsible for the antioxidant activities of the methanolic extracts of the mycelia and the filtrates on lipid peroxidation and scavenging effects of ferrous ions. The maximum polysaccharide content of the methanolic extracts of the filtrates was 55.3mg/g at pH 5.0. Higher yields of antioxidants were obtained in the submerged culture as compared with that of fruiting bodies. An alternative approach for producing antioxidants of A. camphorata in a submerged culture instead of solid state cultures was demonstrated in this study.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2007.04.010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78281316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 31

Optimization of cultivation conditions for fungichromin production from Streptomyces padanus PMS-702 padanus链霉菌PMS-702产真菌色素的培养条件优化

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.006

Jiun-Yan Wu , Jenn-Wen Huang , Hsin-Der Shih , Wei-Chen Lin , Yung-Chuan Liu

引用次数: 26

Absorption of carbon dioxide by the absorbent composed of piperazine and 2-amino-2-methyl-1-propanol in PVDF membrane contactor 由哌嗪和2-氨基-2-甲基-1-丙醇组成的吸附剂在PVDF膜接触器中吸收二氧化碳

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.010

Su-Hsia Lin , Pen-Chi Chiang , Chun-Fan Hsieh , Meng-Hui Li , Kuo-Lun Tung

{"title":"Absorption of carbon dioxide by the absorbent composed of piperazine and 2-amino-2-methyl-1-propanol in PVDF membrane contactor","authors":"Su-Hsia Lin , Pen-Chi Chiang , Chun-Fan Hsieh , Meng-Hui Li , Kuo-Lun Tung","doi":"10.1016/j.jcice.2007.11.010","DOIUrl":"10.1016/j.jcice.2007.11.010","url":null,"abstract":"<div>This paper tests the performance of microporous polyvinylidinefluoride (PVDF) hollow fiber in a gas absorption membrane process (GAM) using the aqueous solutions of piperazine (PZ) and 2-amino-2-methyl-1-propanol (AMP). Experiments were conducted at various gas flow rates, liquid flow rates and absorbent concentrations. Experimental results showed that wetting ratio was about 0.036% when used with the aqueous alkanolamine solutions, while that was 0.39% with aqueous piperazine solutions. The CO2 absorption rates increased with increasing both liquid and gas flow rates at NRe  <!-->20. The increase of the PZ concentration showed an increase of absorption rate of CO2. The CO2 absorption rate was much enhanced by the addition of PZ promoter. The resistance of membrane was predominated as using a low reactivity absorbent and can be neglected as using absorbent of AMP aqueous solution. The resistance of gas-film diffusion was dominated as using the mixed absorbents of AMP and PZ. An increase of PZ concentration, the resistance of liquid-film diffusion decreased but resistance of gas-film increased. Overall, GAM systems were shown to be an effective technology for absorbing CO2 from simulated flue gas streams, but the viscosity and solvent–membrane relationship were critical factors that can significantly affect system performance.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2007.11.010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85710708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 68

An observation of the coexistence of multimers and micelles in a nonionic surfactant C10E4 solution by dynamic light scattering 用动态光散射法观察非离子表面活性剂C10E4溶液中多聚体和胶束的共存

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.009

Ya-Chi Lee , Hwai-Shen Liu , Shi-Yow Lin , Hsiu-Fen Huang , Yung-Yu Wang , Li-Wei Chou

{"title":"An observation of the coexistence of multimers and micelles in a nonionic surfactant C10E4 solution by dynamic light scattering","authors":"Ya-Chi Lee , Hwai-Shen Liu , Shi-Yow Lin , Hsiu-Fen Huang , Yung-Yu Wang , Li-Wei Chou","doi":"10.1016/j.jcice.2007.11.009","DOIUrl":"10.1016/j.jcice.2007.11.009","url":null,"abstract":"<div>The bulk phase of nonionic surfactant C10E4 solution was monitored by a dynamic light scattering (DLS) system at 20°C in a narrow range of concentration near the cmc. Two particle aggregations were observed. The DLS data show (i) there exist premicellar multimers (or called sub-micelles) and (ii) micelles coexist with multimers. The C10E4 sub-micelles have a narrow size distribution with an averaged hydrodynamic diameter (Dh) of 1.35nm. The Dh of the micelles is around 10.5nm at 1.0×10−6 =0.78–0.82μmol/mL, monomers and premicellar multimers coexist and (ii) at C       <!-->micelles coexist. At more elevated concentrations, only the signals from the micelles are detected by DLS.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2007.11.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82721267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Separation of diethylbenzene isomers by distillative freezing 蒸馏冷冻法分离二乙苯异构体

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.008

Lie-Ding Shiau , Keng-Fu Liu , Shyue-Ming Jang , Shoei-Chin Wu

{"title":"Separation of diethylbenzene isomers by distillative freezing","authors":"Lie-Ding Shiau , Keng-Fu Liu , Shyue-Ming Jang , Shoei-Chin Wu","doi":"10.1016/j.jcice.2007.11.008","DOIUrl":"10.1016/j.jcice.2007.11.008","url":null,"abstract":"<div>Due to the close boiling points of the mixed diethylbenzene (DEB) isomers, it is rather complicated to separate them by distillation. A new separation technique, distillative freezing (DF), is successfully applied to separate p-DEB from the diethylbenzene isomers in this study. Basically, the DF process operates at a triple point condition, in which the liquid mixture is simultaneously vaporized and solidified due to the three-phase equilibrium. It results in the formation of pure crystals along with the liquid phase and vapor phase of the mixtures. The process can be continued until the liquid phase is completely eliminated and only the pure solid crystals remain in the feed. A model, whereby the DF process is simulated in a series of equilibrium stage operations, is proposed to direct the DF operation. In the model, each stage is operated under an adiabatic condition at a three-phase equilibrium. The experiments show that, in the p-DEB/m-DEB mixtures, p-DEB can be purified from 80% to 99% through several DF operations with the experimental recovery rate of p-DEB in one DF operation ranging from 58% to 77%. The unique feature of this new separation technique is that no filtration and crystal washing is required after the p-DEB crystals are obtained by DF.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2007.11.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87177362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

The deposition morphology of Brownian/non-Brownian particles within a constricted tube 布朗/非布朗粒子在收缩管内的沉积形态

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.007

You-Im Chang, Yu-Sheng Chen, Wei-You Cheng

{"title":"The deposition morphology of Brownian/non-Brownian particles within a constricted tube","authors":"You-Im Chang, Yu-Sheng Chen, Wei-You Cheng","doi":"10.1016/j.jcice.2007.11.007","DOIUrl":"10.1016/j.jcice.2007.11.007","url":null,"abstract":"<div>The deposition morphology of Brownian/non-Brownian particles within a constricted tube is investigated by applying the Brownian dynamics simulation method in the present paper. Two different geometric structures, the parabolic constricted tube (PCT) and the sinusoidal constricted tube (SCT), are adopted. The effect of various types of the total interaction energy curves of the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, and of the shadow area cast by those deposited particles, on the particles’ collection efficiencies are also examined. For the PCT structure, under the same interaction energy curve, it is found that the non-Brownian particles always own a higher collection efficiency than that of the Brownian particles. Since the deposition location moves closer to the constriction part of the tube, the collection efficiencies of the Brownian/non-Brownian particles increase with the decrease of flow velocity. The SCT behaves differently, it is found that the collection efficiencies of non-Brownian particles are only slightly higher than those of Brownian particles when SCT is adopted. The steep slope of the tube wall near the constriction part of SCT dominates the whole deposition process of Brownian/non-Brownian particles. In comparison with the available experimental data, it is found that the present method can give a good simulation result.</div>","PeriodicalId":17285,"journal":{"name":"Journal of The Chinese Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jcice.2007.11.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88151935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Granulation of gelatine by laminar jet breakup 层流射流破碎明胶造粒

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.12.007

S.M. Lu, M.N. Shaw, D.J. Lee

引用次数: 0

Gold recovery from loaded activated carbon using different solvents 不同溶剂从负载活性炭中回收金

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.11.004

Mansooreh Soleimani, Tahereh Kaghazchi

引用次数: 15

Hydrogen production from methane in a dielectric barrier discharge using oxide zinc and chromium as catalyst 以氧化锌和铬为催化剂的介质阻挡放电中甲烷制氢

Journal of The Chinese Institute of Chemical Engineers Pub Date : 2008-01-01 DOI: 10.1016/j.jcice.2007.10.001

Antonius Indarto

引用次数: 36