Etude de la diminution de concentration d'une espece a partir de la masse d'une suspension. Cette espece a une presence limitee dans le fluide, et disparait par diffusion et reaction de 1er ordre dans les particules spheriques en suspension. Equations reliant la diminution du reactif dans la masse du fluide a la diffusivite du reactif dans la particule, a la constante de vitesse de reaction, au coefficient de transfert de matiere, et au rapport entre le volume de la particule et le volume du fluide qui l'entoure
{"title":"Reaction-diffusion in suspended particles with limited supply of reactant","authors":"K. Papadopoulos, R. V. Bailey","doi":"10.1021/I100022A020","DOIUrl":"https://doi.org/10.1021/I100022A020","url":null,"abstract":"Etude de la diminution de concentration d'une espece a partir de la masse d'une suspension. Cette espece a une presence limitee dans le fluide, et disparait par diffusion et reaction de 1er ordre dans les particules spheriques en suspension. Equations reliant la diminution du reactif dans la masse du fluide a la diffusivite du reactif dans la particule, a la constante de vitesse de reaction, au coefficient de transfert de matiere, et au rapport entre le volume de la particule et le volume du fluide qui l'entoure","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74136141","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}
On derive des solutions pour la localisation et le debit optimaux de N alimentations laterales d'un reacteur tubulaire, dans le cas d'une expression de vitesse monotonique
在单调速度表达式的情况下，给出了管状反应器侧馈电的最佳位置和流量的解。
{"title":"Optimal feed distribution in reactions with maximal rate","authors":"M. Sheintuch, O. Lev, Shlomo Mendelbaum, B. David","doi":"10.1021/I100022A008","DOIUrl":"https://doi.org/10.1021/I100022A008","url":null,"abstract":"On derive des solutions pour la localisation et le debit optimaux de N alimentations laterales d'un reacteur tubulaire, dans le cas d'une expression de vitesse monotonique","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88850238","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}
Mise en evidence de la formation d'alcanes a chaine droite de C 1 a C 14 et d'alcenes de C 2 a C 14 ; il se forme egalement de grandes quantites d'alcanes de C 18 a C 30 a chaines droites et reticulees. Mecanisme de formation de ces nouveaux produits
{"title":"Liquid-phase thermal decomposition of hexadecane: reaction mechanisms","authors":"T. J. Ford","doi":"10.1021/I100022A010","DOIUrl":"https://doi.org/10.1021/I100022A010","url":null,"abstract":"Mise en evidence de la formation d'alcanes a chaine droite de C 1 a C 14 et d'alcenes de C 2 a C 14 ; il se forme egalement de grandes quantites d'alcanes de C 18 a C 30 a chaines droites et reticulees. Mecanisme de formation de ces nouveaux produits","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77950059","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}
Mathematical models describing isothermal tubular reactors in which first-order chemical reactions and uncoupled multicomponent diffusion occur are solved by a linear operator formalism. A pseudohomogeneous axial dispersion model accounting for both bulk-fluid-phase dispersion and intraparticle diffusion is solved to examine the effect of widely disparate configuration diffusion coefficients on selectivity in the reactor. The operator formalism is shown to obtain also solutions for the mathematically more complicated situation of a wall-catalyzed reactor with a nonuniform, fully developed flow profile. Computations presented for the axial dispersion model demonstrate that intraparticle diffusion hindrances in molecular sieve catalysts can drastically affect the selectivity of the xylene isomerization system. The influence of reactor parameters (Peclet and Damkohler numbers) and reactor feed conditions on product selectivity is investigated in order to elucidate the conditions under which optimum selectivity can be expected.
{"title":"Multicomponent reaction and diffusion in a tubular reactor: an operator-theoretic solution","authors":"B. Turner, D. Ramkrishna","doi":"10.1021/I100022A013","DOIUrl":"https://doi.org/10.1021/I100022A013","url":null,"abstract":"Mathematical models describing isothermal tubular reactors in which first-order chemical reactions and uncoupled multicomponent diffusion occur are solved by a linear operator formalism. A pseudohomogeneous axial dispersion model accounting for both bulk-fluid-phase dispersion and intraparticle diffusion is solved to examine the effect of widely disparate configuration diffusion coefficients on selectivity in the reactor. The operator formalism is shown to obtain also solutions for the mathematically more complicated situation of a wall-catalyzed reactor with a nonuniform, fully developed flow profile. Computations presented for the axial dispersion model demonstrate that intraparticle diffusion hindrances in molecular sieve catalysts can drastically affect the selectivity of the xylene isomerization system. The influence of reactor parameters (Peclet and Damkohler numbers) and reactor feed conditions on product selectivity is investigated in order to elucidate the conditions under which optimum selectivity can be expected.","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77535073","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}
Modelisation du comportement hydrodynamique d'un ecoulement piston turbulent ascendant gaz-liquide, basee sur une analyse detaillee de la structure de l'ecoulement. Mecanisme de l'ecoulement du liquide dans le bouchon contenant des bulles de gaz dispersees, en vue d'evaluer la fraction de vide du bouchon de liquide
{"title":"A model for gas-liquid slug flow in a vertical tube","authors":"A. Orell, R. Rembrand","doi":"10.1021/I100022A004","DOIUrl":"https://doi.org/10.1021/I100022A004","url":null,"abstract":"Modelisation du comportement hydrodynamique d'un ecoulement piston turbulent ascendant gaz-liquide, basee sur une analyse detaillee de la structure de l'ecoulement. Mecanisme de l'ecoulement du liquide dans le bouchon contenant des bulles de gaz dispersees, en vue d'evaluer la fraction de vide du bouchon de liquide","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82569492","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}
Si l'on effectue une analyse de perturbation avant la synthese d'un arbre de defaut, on peut utiliser des algorithmes plus generaux
如果在合成故障树之前进行扰动分析，则可以使用更通用的算法。
{"title":"Automated fault tree synthesis by disturbance analysis","authors":"H. Kumamoto, E. Henley","doi":"10.1021/I100022A009","DOIUrl":"https://doi.org/10.1021/I100022A009","url":null,"abstract":"Si l'on effectue une analyse de perturbation avant la synthese d'un arbre de defaut, on peut utiliser des algorithmes plus generaux","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76762265","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}
The pyrolysis of ethane, propane, isobutane, n-butane, and n-decane has been studied with H/sub 2/S added in the 0-10% range under conditions in which the surface/volume (S/V) ratio was varied over approximately 6 orders of magnitude. In the absence of H/sub 2/S the pyrolysis rates and product selectivities remained virtually constant over large changes in S/V ratio. At low S/V ratios H/sub 2/S can either inhibit or accelerate the rate of hydrocarbon decomposition depending upon the nature of the intermediate radicals. Under high S/V conditions, H/sub 2/S caused an increase in pyrolysis rate for all hydrocarbons tested. The results are consistent with a mechanism and kinetic analysis in which the effect of high surface area is to catalyze the decomposition of H/sub 2/S into intermediate radicals. The effects of H/sub 2/S on product selectivity appear as a large increase in propylene yield from n-butane feed, increased isobutene from isobutane feed, and little or no change in selectivity with n-decane, propane, or ethane feed.
{"title":"Heterogeneous and homogeneous effects of hydrogen sulfide on light-hydrocarbon pyrolysis","authors":"J. Kolts","doi":"10.1021/I100022A014","DOIUrl":"https://doi.org/10.1021/I100022A014","url":null,"abstract":"The pyrolysis of ethane, propane, isobutane, n-butane, and n-decane has been studied with H/sub 2/S added in the 0-10% range under conditions in which the surface/volume (S/V) ratio was varied over approximately 6 orders of magnitude. In the absence of H/sub 2/S the pyrolysis rates and product selectivities remained virtually constant over large changes in S/V ratio. At low S/V ratios H/sub 2/S can either inhibit or accelerate the rate of hydrocarbon decomposition depending upon the nature of the intermediate radicals. Under high S/V conditions, H/sub 2/S caused an increase in pyrolysis rate for all hydrocarbons tested. The results are consistent with a mechanism and kinetic analysis in which the effect of high surface area is to catalyze the decomposition of H/sub 2/S into intermediate radicals. The effects of H/sub 2/S on product selectivity appear as a large increase in propylene yield from n-butane feed, increased isobutene from isobutane feed, and little or no change in selectivity with n-decane, propane, or ethane feed.","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78826897","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}
Methode generale de calcul des rapports de reflux minimum dans les colonnes a double alimentation. Cette methode s'applique aux distillations azeotropiques et aux melanges ideaux et non ideaux. Criteres algebriques permettant de trouver le meilleur alignement de l'alimentation
{"title":"Design and synthesis of homogeneous azeotropic distillations. 4. Minimum reflux calculations for multiple-feed columns","authors":"S. Levy, M. Doherty","doi":"10.1021/I100022A015","DOIUrl":"https://doi.org/10.1021/I100022A015","url":null,"abstract":"Methode generale de calcul des rapports de reflux minimum dans les colonnes a double alimentation. Cette methode s'applique aux distillations azeotropiques et aux melanges ideaux et non ideaux. Criteres algebriques permettant de trouver le meilleur alignement de l'alimentation","PeriodicalId":13548,"journal":{"name":"Industrial & Engineering Chemistry Fundamentals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85257937","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}
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