Mass-transfer operations by Robert E. Treybal PDF

By Robert E. Treybal

ISBN-10: 0070651760

ISBN-13: 9780070651760

Author's objective in providing the 3rd version of this ebook remains to be that of the former variation: "to supply a automobile for instructing, both via a proper path or via self-study, the recommendations of, and ideas of kit layout for, the mass-transfer operations of chemical engineering." As ahead of, those operations are principally the accountability of the chemical engineer, yet more and more practitioners of alternative engineering disciplines are discovering them beneficial for his or her paintings. this is often very true for these engaged in toxins regulate and surroundings security, the place separation procedures predominate, and in, for instance, extractive metallurgy, the place extra refined and various equipment of separation are more and more relied upon.

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Diffusion path to the other, but a linear variation with distance can usually be assumed for practical calculations [IJ. , all but one component is stagnant. 35) then becomes [23] 1 - YA DA,m=--~- ±~ ;=8 DA,i t Numbered references appear at the end of the chapter. 4 Equimolal counterdiffusion. Z where y; is the mole fraction of component i on an A-free basis. The limitations of Eq. 35) and some suggestions for dealing with them have been considered [21 ]. t Oxygen (A) is diffusing through carbon monoxide (8) under steady-state conditions.

0353 outward to 0 mole fraction N~C03 in the bulk liquid. 0 mole fraction in the bulk liquid. or transfer up a concentration gradient. Application of Eq. 40) confinns this. The expressions developed for the rate of mass transfer under conditions where molecular diffusion defines the mechanism of mass transfer (fluids which are stagnant or in laminar flow) are of course directly applicable to the experimental measurement of the diffusivities, and they are extensively used for this. In the practical applications of the mass-transfer operations, the fluids are always in motion, even in batch processes.

Same jn both phases. Thus the ammonia concentration will be uniform throughout the liquid and uniform at a different value throughout the gas. ess_tCULhatt. ce. iat and not concentration. In IDnltjpbase systems, however. s. ~Iecuiar Diffusion \Ve have noted that if a solution is everywhere uniform in, concentration of its constituents, no alteration occurs but that as long as it is not uniform. ne_olJow. t in any direction must therefore de~ on the concentration gradient at tha t poin t and in that direction.

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Mass-transfer operations by Robert E. Treybal


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