摘要:

AbstractA model which accounts for the effect of a confining wall and the resulting voidage variations near it on the flow behavior in packed columns is proposed.The model, which is restricted to columns randomly packed with spheres of uniform size, reasonably describes the pressure drop‐flow rate relationship for both linear and non‐Newtonian fluids. The mass flux distribution is also studied in order to provide an insight into processes in which the flow behavior near the wall may be import

ISSN:0001-1541    

DOI:10.1002/aic.690270502

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractDiffusional limitations in single bond and multibond initiators were experimentally investigated. The concept of “microviscosity” was proposed to account for diffusional resistance in different media. This was then used to obtain a unified correlation of the diffusional phenomena regardless of the nature of viscogen. Parameters related to the kinetic and diffusive processes were evaluated and interpreted giving clear fundamental and pragmatic implications of the findi

ISSN:0001-1541    

DOI:10.1002/aic.690270503

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractA new implicit enumeration algorithm locates the minimum weighted tear sets among those which belong to the nonredundant families of Upadhye and Grens (1975). Theoretical developments support the algorithm and give a new insight relating nonredundancy to the tearing of unit loops in a flowsheet. If all loops can be torn exactly one time, the nonredundant family is unique and a member of it is trivial to find. If not possible, two or more nonredundant families exist and the above algorithm discerns among them, picking a tear set which minimizes the maximum number of times any unit loop is torn.

ISSN:0001-1541    

DOI:10.1002/aic.690270504

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractA mathematical model and iterative correction algorithm are described for the exact solution of separation systems which contain interlinked columns in which some stages have two liquid phases and others have a vapor and liquid phase. The correction algorithm is based on Newton's method and provides for simultaneous correction of all iteration variables. The derivatives are calculated analytically from the model equations. The separation of a binary mixture which forms a heterogeneous azeotrope is analyzed. Modifications to the correction algorithm which provide for fixed condenser temperature and fixed product flows are described. The separation of butanol and water is used to illustrate the method.

ISSN:0001-1541    

DOI:10.1002/aic.690270505

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractA new asymptotic expansion is presented to describe the dissolution or growth of an isolated, stationary gas bubble in a liquid. With the exception of long times, bubble radii calculated via this expansion are in excellent agreement with values obtained by numerical methods over a wide range of gas under(super)‐saturation

ISSN:0001-1541    

DOI:10.1002/aic.690270506

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractTwo process computer control algorithms which are based on long‐range prediction are outlined. The methods are compared, similarities pointed out, and each is shown to become similar to dead‐beat control under certain circumstan

ISSN:0001-1541    

DOI:10.1002/aic.690270507

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractThe phase equilibria of the systems are discussed:(i)n‐butanol‐acetic acid‐water and n‐heptane(ii)Water‐acetic acid‐benzene and carbon tetrachloride(iii)Water‐methanol‐p.cresol and methyl naphthalene have been studied and a correlating procedure has been developed that utilizes binary and ternary experimental data to predict the composition of the quaternary equilibrium mixtures. Allowance is made for the different salting effects and the agreement between the experimental and predicted quaternary data is in all

ISSN:0001-1541    

DOI:10.1002/aic.690270508

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractThe kinetics of the esterification of n‐butyl alcohol with acetic acid has been studied experimentally in concentrated solutions at near ambient temperature in the presence of a sulphuric acid catalyst and the rate constants for the forward and reverse reaction determined.The rate data obtained from the homogeneous system has been applied to analyse the performance of a batch‐extractive reactor using n‐heptane as solvent. The rate of mass transfer of the ester was found to be significant and when introduced in a model of the reaction process gave good agreement with the experimental re

ISSN:0001-1541    

DOI:10.1002/aic.690270509

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractThe esterification of n‐butyl alcohol with acetic acid has been carried out continuously in a Rotating Disc Extractor (RDC) in a two phase water‐n‐heptane system. Peculiar phase inversion characteristics have been observed under some experimental conditions during simultaneous transfer of the acid and alcohol, and this has been explained in terms of the changes in the concentration gradients of these two species along the length of the column.A mathematical model has been developed of the continuous process incorporating the equilibria correlations presented in Part I of this study and the kinetic data presnted in Part II to predict the performance of the RDC. The predicted results have been compared with the experimental results and good agreement was obt

ISSN:0001-1541    

DOI:10.1002/aic.690270510

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractData have been taken by a new flow technique for the solubility of nonpolar hydrocarbons in nonpolar supercritical fluids. These results for molecularly simple molecules provide a basis for the analytical representation of such systems by relatively simple equations of state.

ISSN:0001-1541    

DOI:10.1002/aic.690270511

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY