Theoretical Analysis of Fractionating Process of Adsorption

Mair, Beveridge J.; Westhaver, J. W.; Rossini, Frederick D.

doi:10.1021/ie50487a015

Cited by 24 publications

(8 citation statements)

References 9 publications

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“…Separation of Three Mixtures Containing Paraffin, Olefin, and Aromatic Hydrocarbons (6) the molecules of A and B move downward over fresh adsorbent with a suitable desorbent following. The manner in which the composition of an equimolecular mixture of two substances A and B varies along the length of an adsorption fractionating column at various stages of the process is shown in Figure 2 of (12). As soon as the flow of material has started, component A begins to accumulate at the top of the section and component B at the bottom, while the middle portion remains, for some time, unchanged in composition.…”

Section: Theory Of the Methodsmentioning

confidence: 99%

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Petroleum Hydrocarbons

Mair¹

1950

Ind. Eng. Chem.

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concentrations; higher original filling concentrations merely delay the equilibrium point a few replenishments. The equilibrium point is influenced mainly by the concentration of the replenishing solution and the vat level at which replenishment is done. Thus it seems possible that a certain saving in chemical could be effected by using a solution of one half of the usual strength in originally filling a vat and then replenishing with usual strength. Also if the vat inadvertently dropped below the desired SO% volume level it would not be necessary to use stronger than usual solutions to bring the concentrations back to the desired strength.This information on replenishing vats is somewhat speculative, particularly since it is not based on data derived from tests of actual replenishing schedules. Also the wide variation in stain hazard undcr different geographical and saw-milling conditions should greatly influence safe vat levels. However, the information should be useful as a guide in handling mercurial solutions.Ethyl mercuric phosphate has been widely and successfully used for protecting green lumber against stain for many years. However, when this chemical is used it seems desirable to consider adsorption in devising replenishing schedules. The desired effect can be srcured either by replenishing vats with concentre tions higher than originally used or by replenishing a t frequent intervals with usual concentrations. In the latter case the indication is that the amouht of solution in the vat should never be less than 80% of the original volume. Frequent replenishment with usual concentrations would seem the most logical method of controlling concentrations in most milling operations. The importance of maintaining concentrations would be greatest during warm wet weather when stain is relatively difficult to control even with the best fungicides, SUMMARYLaboratory and field tests showed that the fungicides commonly used for controlling stain, mold, and decay fungi on green lumber progressively decrease in effectiveness with repeated use.It is assumed that this is due to adsorption of the toxic solutes to the wood.Of the fungicides tested, solutions of ethyl mercuric phosphate were much reduced in effectiveness after sufficient wood has been dipped so that half of the solution has been taken up by the lumber. Sodium pentachlorophenate was but slightly weakened. Mixtures of either of these with borax, and of both together with borax were weakened to an intermediate degree. Only the weakening of the mercurial alone and the mercurial plus borax were considered of commercial significance under the conditions of the tests.Loss in strength of mercurial solutions probably can be reduced to a safe level by replenishing treating solutions with stronger solutions than originally used or by frequent replenishment of solutions with concentrations recommended for general use. The indications are that adequate strengths will be maintained if additions of recommended concentrations are made before the solution level in the tre...

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Section: Theory Of the Methodsmentioning

confidence: 99%

“…where U represents the total volume of material which has flowed through the system and AYA is the difference in volume fraction of component A between the adsorbed and liquid phases. It has been shown (12) that the separation factor, a, for the adsorption fractionating process is given by the equation…”

Section: Theory Of the Methodsmentioning

confidence: 99%

Petroleum Hydrocarbons

Mair¹

1950

Ind. Eng. Chem.

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“…Solvents are selectively absorbed from solvent mixtures by a novel separation procedure using polymeric materials of limited swellability _L he ability of some solid adsorbents to adsorb certain solvents selectix'ely from a mixture of two or more solvents has been utilized in separating petroleum hydrocarbon mixtures (7,4,9,10). The Arosorb process is a technical example of such separation (3).…”

Section: Separation Of Miscible Liquids By Polymeric Absorbentsmentioning

confidence: 99%

Separation of Miscible Liquids by Polymeric Absorbents

Hwa¹,

Meitzner²,

McBurney³

1957

Ind. Eng. Chem.

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“…In the use of these equations, a constant pore volume can he assumed without great error for hydrocarbon systems (6,16). More accurate results, however, may be obtained by taking the pore volume to be a linear function of the adsorbed phase composition between the values of Vp for the components of the given binary system.…”

Section: Adsorption Equilibriamentioning

confidence: 99%