ISSN:0001-1541    

DOI:10.1002/aic.690060338

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractThe Chemical Engineering Progress Symposium Series is composed of papers on specific subjects conveniently bound in individual books, which are published at intervals. The books are 8 1/2 by 11 inches, paper covered, and cost $3.50 to members, $4.50 to nonmembers. They may be ordered from the Secretary's Office, the American Institute of Chemical Engineers, 25 West 45 Street, New York 36, New York.TheA. I. Ch. E. Journalwill publish, from time to time, abstracts of the articles appearing in the Symposium Series volumes. Recently published volumes are abstracted below.

ISSN:0001-1541    

DOI:10.1002/aic.690060337

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690060302

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractCriterion for flooding which was found to be reproducible in packed columns has been described. Limiting velocities, holdup, and pressure drop at flooding have been experimentally determined for binary liquid systems in a countercurrent extraction column packed with raschig rings, Berl saddles, Lessing rings, and spheres. Generalized correlations have been suggested, with the experimental data taken into account along with, published data of other workers for the estimation of limiting velocities, holdup, and pressure drop at flooding.

ISSN:0001-1541    

DOI:10.1002/aic.690060303

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractA radiological method has been developed to study the local flow characteristics in two‐phase contacting equipment. The method presented permits the evaluation of both the vertical and horizontal components of the liquid holdup and flow distribution and can also be used to study the performance of a wide variety of two‐phase contacting apparatus. An external source of radiation is used, and hence neither phase is contaminated by the radioactive material.The application of this method is illustrated in the specific case of air‐water contact in a countercurrent packed c

ISSN:0001-1541    

DOI:10.1002/aic.690060304

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractThe mathematical equations describing the kinetic behavior of ion exchange processes have been solved analytically for systems having linear equilibrium relationships of the typeq* =K1+K2C*. The concentration ratios of the effluent to the influent solution for these cases are found to depend on parameters involving time, position, and relative resistances of the liquid and resin phases. Numerical results have been obtained and are presented in tabular and graphical forms. Furthermore expressions for the constant pattern breakthrough curve for two special cases have also been worked out.

ISSN:0001-1541    

DOI:10.1002/aic.690060305

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractA detailed analysis of initial rate data obtained for the catalytic dehydrogenation ofsec‐butyl alcohol to methyl ethyl ketone in the presence of brass reveals that the controlling step of the reaction changes and depends on the operating conditions. To take advantage of the unique characteristics of initial rate equations, the experimental phase of this work has been carried out with a differential reactor and covered the temperature range 550° to 700°F. for pressures up to 15 atm. Feed compositions containingsec‐butyl alcohol and mixtures with methyl ethyl ketone and hydrogen were used.These studies show that the desorption of molecularly adsorbed hydrogen ceases to be the controlling step in favor of a dual‐site surface reaction depending on the operating variables. In view of these observations it now becomes necessary to calculate reaction rates with both over‐all rate equations and to select the lower rate as representative of the controlling step of the

ISSN:0001-1541    

DOI:10.1002/aic.690060306

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractThe performance of sieve trays in the rectification of the methanol‐water system without entrainment or leakage from the perforations was studied in an 8‐in.–diameter five‐tray column. The trays had a 2‐in. weir height and 4‐in. length of liquid path. Three tray geometries were studied: 1/4‐in. diameter holes on 3/4‐in. triangular spacing, 1/8‐in. holes on 3/8‐in. triangular spacing, and 3/16‐in. on 7/16‐in. triangular spacing. The superficial vapor velocity was varied from 2.2 ft./sec. to the limit of stable operation, which for this apparatus was 4.4 ft./sec. The ratioLM/VMwithin the column was varied from 1 to 0.5. The Murphree plate efficiency varied greatly from 105% at low concentration to 82% at high concentrations of methanol. Variations of 10 or 12 efficiency % were noted owing to changing velocities and tray geometries. Measurements of concentration gradients, foam heights, and gas pressure drops are also reported. This paper proposes a method of calculating the point efficiency and the number of individual‐phase mass transfer units independent of the actual concentration gradient on the tray.The method is applied to the methanol‐water data, and calculated point efficiencies range from 50 to 65%. The value of 1/NLfor the methanol‐water system is found to be small. The values ofNGand the effect of the velocity onNGare believed to be the first in the literature for a tray in distillation operation. The effect of velocity is shown to be in agreement with the theory proposed by Gerster and co‐workers. It is shown thatkG' aGdecreases for increasing free area and increasing hole size. Finally variation inLM/VMis sh

ISSN:0001-1541    

DOI:10.1002/aic.690060307

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractResistances to the flow of fluids through porous beds were determined in a compression‐permeability cell, a vacuum test filter, and an experimental centrifugal filter. The study was made on nearly incompressible beds composed of Lucite spheres having a given size distribution. The results show that liquid flow through the cakes in all three kinds of equipment can be described by a common basic equation, the terms of which are modified to reflect the type of operation. The centrifugal‐drainage data confirm the form of the centrifugal‐filtration equation. The specific resistances deduced from vacuum‐filtration and centrifugal‐drainage tests agree with permeability‐cell alphas within 16% at the same ΔPand within 2 to 3% at the s

ISSN:0001-1541    

DOI:10.1002/aic.690060308

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY

摘要:

AbstractThis work presents initial information useful to concurrent gas‐absorption design. Data are reported on the variation of pressure drop and liquid holdup obtained with various flow rates, packings, and liquid

ISSN:0001-1541    

DOI:10.1002/aic.690060309

出版商:American Institute of Chemical Engineers    

年代:1960

数据来源: WILEY