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Studies on transfer processes in mixing vessels: hydrodynamic of the modified Rushton turbine agitators in gas—liquid dispersions 混合容器内传递过程的研究:改进的Rushton涡轮搅拌器在气液分散体中的流体力学
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-02-01 DOI: 10.1016/0923-0467(95)03033-6
R.V. Roman , R.Z. Tudose
{"title":"Studies on transfer processes in mixing vessels: hydrodynamic of the modified Rushton turbine agitators in gas—liquid dispersions","authors":"R.V. Roman ,&nbsp;R.Z. Tudose","doi":"10.1016/0923-0467(95)03033-6","DOIUrl":"10.1016/0923-0467(95)03033-6","url":null,"abstract":"<div><p>The modified blade turbines are attractive alternatives to the standard Rushton turbine as they do not require any modification in the electrical engine motor and drive assemblies, are simple to manufacture, have a reduced power consumption and have a greatly increased gas-handling capacity before flooding.</p><p>The modified blades were obtained through increase in the blade height of the Rushton turbine simultaneously with perforation of the blade surface. The filled surface of the modified blade is equal to the blade surface of the standard Rushton turbine.</p><p>Power dissipation and hydrodynamic regimes using standard and modified Rushton turbine agitators positioned singly or doubly on the same shaft, in a gas—liquid system, were investigated.</p><p>The TP3 modified turbine with the surface fraction <em>S</em><sub>G</sub>/<em>S</em><sub>C</sub> of the perforation equal to 0.353 is optimum on the basis of the power consumption and of the gas-handling and dispersing capacity.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 2","pages":"Pages 83-93"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(95)03033-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84807787","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: 13
Diffusion, convection and reaction in catalyst particles: analogy between slab and cylinder geometries 催化剂颗粒中的扩散、对流和反应:板状和圆柱形几何的类比
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-02-01 DOI: 10.1016/0923-0467(96)80019-4
H.S. Nan, M.M. Dias, J.C.B. Lopes, A.E. Rodrigues
{"title":"Diffusion, convection and reaction in catalyst particles: analogy between slab and cylinder geometries","authors":"H.S. Nan,&nbsp;M.M. Dias,&nbsp;J.C.B. Lopes,&nbsp;A.E. Rodrigues","doi":"10.1016/0923-0467(96)80019-4","DOIUrl":"10.1016/0923-0467(96)80019-4","url":null,"abstract":"<div><p>Forced intraparticle convection in a finite cylinder porous catalyst particle is studied. An analytical solution for steady state, simultaneous diffusion, convection and reaction is obtained and the effect of intraparticle convection on the catalyst performance, i.e. its effectiveness factor, is analysed. The relationship for the augmented intraparticle effective diffusivity and an equivalence ratio between the slab and the finite cylinder characteristic dimensions, valid in the whole range of Thiele modulus, are obtained.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 2","pages":"Pages 113-122"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)80019-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91502584","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: 5
Observer-based non-linear control of a fed-batch autoinductive fermentation process 基于观测器的补料自感应发酵过程非线性控制
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-02-01 DOI: 10.1016/0923-0467(96)80021-2
B. Tartakovsky, B.E. Dainson, D.R. Lewin, M. Sheintuch
{"title":"Observer-based non-linear control of a fed-batch autoinductive fermentation process","authors":"B. Tartakovsky,&nbsp;B.E. Dainson,&nbsp;D.R. Lewin,&nbsp;M. Sheintuch","doi":"10.1016/0923-0467(96)80021-2","DOIUrl":"10.1016/0923-0467(96)80021-2","url":null,"abstract":"<div><p>Optimal regulatory control of an autoinductive recombinant culture in a fed-batch reactor is considered. End point optimization results in a three-stage process: biomass growth, inducer synthesis and product synthesis. It is shown that in the last stage the substrate concentration should be maintained constant. This is achieved using an input—output linearizing controller accompanied by a novel non-linear state observer for the estimation of unmeasured state variables on the basis of on-line off-gas carbon dioxide concentration measurements. Experimental runs of luminous recombinant <em>E. coli</em> strain in a laboratory fermenter demonstrate the rapid convergence of the observer estimates as well as the effectiveness and robustness of the overall control system.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 2","pages":"Pages 139-148"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)80021-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75553359","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: 2
Heat transfer measurements in a liquid vessel that is mixed using a vibratory agitator 用振动搅拌器混合的液体容器中的传热测量
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-02-01 DOI: 10.1016/0923-0467(96)80018-2
S. Masiuk
{"title":"Heat transfer measurements in a liquid vessel that is mixed using a vibratory agitator","authors":"S. Masiuk","doi":"10.1016/0923-0467(96)80018-2","DOIUrl":"10.1016/0923-0467(96)80018-2","url":null,"abstract":"<div><p>In this paper experimental data on the heat transfer performance of a cylindrical vessel filled with liquid that is mixed using a single vibrating multihole plate are reported. A continuous liquid flow is maintained through the vessel and a Nusselt number heat transfer correlation derived for the system operating under a range of vibration conditions.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 2","pages":"Pages 107-112"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)80018-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81534765","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: 9
Immobilization of Mucor miehei lipase on ion exchange resins 离子交换树脂固定化毛霉脂肪酶的研究
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-02-01 DOI: 10.1016/0923-0467(96)80022-4
Neena N. Gandhi, V. Vijayalakshmi, Sudhirprakash B. Sawant, Jyeshtharaj B. Joshi
{"title":"Immobilization of Mucor miehei lipase on ion exchange resins","authors":"Neena N. Gandhi,&nbsp;V. Vijayalakshmi,&nbsp;Sudhirprakash B. Sawant,&nbsp;Jyeshtharaj B. Joshi","doi":"10.1016/0923-0467(96)80022-4","DOIUrl":"10.1016/0923-0467(96)80022-4","url":null,"abstract":"<div><p>An attempt was made to immobilize <em>Mucor miehei</em> lipase on ion exchange resins and other supports. Indion 850, a styrene-divinyl benzene polymer resin, proved to be the best among the supports tested. The procedure for immobilization is simple adsorption of the soluble enzyme from dilute aqueous solution onto the resin beads. The immobilized version was found to have 1.4 times higher activity compared with its soluble counterpart and an enhanced thermal stability.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 2","pages":"Pages 149-156"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)80022-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77940005","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: 28
Thermal conductivity of hydrated silica-gel 水合硅胶的导热性
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-02-01 DOI: 10.1016/0923-0467(96)80020-0
José Maurício Gurgel, Rogerio P. Klüppel
{"title":"Thermal conductivity of hydrated silica-gel","authors":"José Maurício Gurgel,&nbsp;Rogerio P. Klüppel","doi":"10.1016/0923-0467(96)80020-0","DOIUrl":"10.1016/0923-0467(96)80020-0","url":null,"abstract":"<div><p>The temperature of points inside a cylindrical packed bed of silica-gel grains is measured under steady-state and transient radial heat flow conditions, for different pressures and water contents of the silica. The stationary results are used to calculate the thermal conductivity of the silica packed beds. The transient results are used to find the thermal diffusivity of the beds using a numerical solution of the heat conduction equation. The conductivity of the particle material can be calculated using the Bauer and Schluender model for the heat transfer inside the granular bed. The thermal conductivity of the packed bed is found to increase with pressure at pressures below 10 kPa. The thermal conductivity of the bed, and of the solid particles, is found to vary linearly with the water content of the silica-gel.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 2","pages":"Pages 133-138"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)80020-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87708837","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
Production of ethene oxide in a sieve plate electrochemical reactor Part II: Mathematical reactor model and factors affecting the relative concentrations of ethene and bromine 筛板电化学反应器生产环氧乙烷。第二部分:反应器数学模型及影响乙烯和溴相对浓度的因素
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-01-01 DOI: 10.1016/0923-0467(95)03020-4
K. Scott , W. Hui
{"title":"Production of ethene oxide in a sieve plate electrochemical reactor Part II: Mathematical reactor model and factors affecting the relative concentrations of ethene and bromine","authors":"K. Scott ,&nbsp;W. Hui","doi":"10.1016/0923-0467(95)03020-4","DOIUrl":"10.1016/0923-0467(95)03020-4","url":null,"abstract":"<div><p>The sieve plate electrochemical reactor is a unit for enabling electrochemical reaction of gaseous species in the liquid phase. The reaction can occur either directly at the surface of the electrodes or indirectly with electrochemical mediators generated in situ. A sieve plate absorber is used for the gas-to-liquid mass transfer and, on appropriate stages, stacks of electrodes are supported on the sieve plates and are electrically connected in a bipolar configuration. Data are reported for the indirect oxidation of ethene using bromine formed by the anodic oxidation of bromide solutions on graphite electrodes. The effect of ethene partial pressure and current density on the current efficiency, selectivity and energy consumption of ethene oxide is reported. The effect of using a co-solvent (<em>t</em>-butyl alcohol), to increase ethene solubility, on the performance of the reactor is also reported. The reactor is capable of achieving conversions of ethene in the gas phase greater than 80%, although current efficiencies are relatively low, approximately 50%. A mathematical model for the unit is developed which accommodates interphase mass transport of reactants, and product species, between gas and liquid.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 1","pages":"Pages 13-20"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(95)03020-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73750509","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: 2
Neural network modelling for on-line state estimation in fed-batch culture of l-lysine production l-赖氨酸间歇培养在线状态估计的神经网络建模
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-01-01 DOI: 10.1016/0923-0467(96)03015-1
Yet-Pole I, Wen-Tengu Wu, Yung-Chuan Liu
{"title":"Neural network modelling for on-line state estimation in fed-batch culture of l-lysine production","authors":"Yet-Pole I,&nbsp;Wen-Tengu Wu,&nbsp;Yung-Chuan Liu","doi":"10.1016/0923-0467(96)03015-1","DOIUrl":"10.1016/0923-0467(96)03015-1","url":null,"abstract":"<div><p>A moving window neural network was applied for dynamic modelling and on-line estimation of consumed sugar, cell mass, and product concentration in <span>l</span>-lysine fed-batch culture. The organisms were auxotrophic mutants for <span>l</span>-homoserine and were resistant to <em>S</em>-(2-aminoethyl)-<span>l</span>-cysteine. The reducing sugar concentration was calculated on line by using the estimated consumed sugar concentration and was maintained at a given value by a simple compensatory feeding strategy. With the estimator, the fed-batch culture could be satisfactorily carried out.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 1","pages":"Pages 35-40"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)03015-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84369544","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: 22
Process integration aspects for the production of fine chemicals illustrated with the biotransformation of γ-butyrobetaine into l-carnitine 精细化工生产的工艺整合方面以γ-丁甜菜碱转化为左旋肉碱为例
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-01-01 DOI: 10.1016/0923-0467(95)03018-2
F. Hoeks, J. Mühle, L. Böhlen, I. Pšenička
{"title":"Process integration aspects for the production of fine chemicals illustrated with the biotransformation of γ-butyrobetaine into l-carnitine","authors":"F. Hoeks, J. Mühle, L. Böhlen, I. Pšenička","doi":"10.1016/0923-0467(95)03018-2","DOIUrl":"https://doi.org/10.1016/0923-0467(95)03018-2","url":null,"abstract":"","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"34 1","pages":"53-61"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78920591","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: 18
Inversion of sucrose solution by ion exchange: evaluation of reaction rate and diffusivity 用离子交换法反转蔗糖溶液:反应速率和扩散率的评价
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-01-01 DOI: 10.1016/0923-0467(96)02978-8
S.H. Khan, K. Rahman
{"title":"Inversion of sucrose solution by ion exchange: evaluation of reaction rate and diffusivity","authors":"S.H. Khan,&nbsp;K. Rahman","doi":"10.1016/0923-0467(96)02978-8","DOIUrl":"10.1016/0923-0467(96)02978-8","url":null,"abstract":"<div><p>The inversion of sucrose solution was studied in a packed bed of strongly acidic cation exchange resins in order to determine the values of the reaction rate constant, effective diffusivity and distribution coefficients for 20, 30 and 40 wt.% solution concentration. Typical values of specific rate constant for 30 wt.% sucrose solution varied from 0.0115 to 0.7391 min<sup>−1</sup> in the temperature range from 30 to 70 °C. The intrinsic values of activation energy and Arrhenius constant were 24.93 kcal mol<sup>−1</sup> and 7.657 × 10<sup>15</sup> min<sup>−1</sup> respectively. The effective diffusivity varied from 3.826 × 10<sup>−8</sup> to 18.951 × 10<sup>−8</sup> cm<sup>2</sup> s<sup>−1</sup> for the above concentration and temperature intervals. The distribution coefficient was about unity. It was found that liquid film mass transfer resistance was important at low flow rates, although the solution concentration was high.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"61 1","pages":"Pages 7-12"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-0467(96)02978-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78936098","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: 6
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