By Robert E. Treybal
Author's function in providing the 3rd version of this booklet remains to be that of the former variation: "to supply a car for educating, both via a proper path or via self-study, the options of, and rules of apparatus layout for, the mass-transfer operations of chemical engineering." As prior to, those operations are mostly the accountability of the chemical engineer, yet more and more practitioners of alternative engineering disciplines are discovering them helpful for his or her paintings. this is often very true for these engaged in pollutants keep an eye on and atmosphere security, the place separation techniques predominate, and in, for instance, extractive metallurgy, the place extra subtle and various equipment of separation are more and more relied upon.
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Additional resources for Mass-transfer operations
25"C. the concentrations of oxygen at two planes 2 mm apart are 10 and 20 vol %, respectively. Calculate the nux of diffusion of the oxygen for the case where: (a) The nitrogen is nondiffusing. 97 X 10- s kmol/m 2 • s. (b) There is equimolar counterdiffusion of the two gases. 2 Repeat the calculations of Prob. 3 Estimate the diffusivities of the following gas mixtures: (a) Acetone-air. 25 x 10- 6 m2 Is. (b) Nitrogen-carbon dioxide, 1 std atm, 25"C. 57 X 10- 6 m2/s. (d) Toluene-air, I std atm, 30 D C.
Kmol/m2 • s . mole fraction K y , ky[lb/ft . h . 356 X 10- 3) ... kg/m2 • s . 356 x 1O- 3} ... kmol/m2 • s x;.. Volumetric mass-transfer coefficient, mole/Ll9(F /L") and others For volumetric coefficients of the type Ka, ka, Fa, and the like, multiply the conversion factors for the coefficient by that for a. 807) .. 807) ... 59) "" N/m (dyn/cmXIO-') "'" N/m (erg/cm1)(1O-J) ... 88) ... N/m2 - Pa (lb,/in")(6895) = N/m2 ... Pa std atm(L0133 X lOS) - Njm 2 = Pa inHg(3386) ... 1)" N/m2 - Pa (dyn/cm~lO-I) ...
4061 X 10- 3 kgJm . s. t DAD JLI T should be constant: SOLUTION At 20"C. 62 X 10- 9 m 2/s at 10°C Ans. Applications of Molecular Diffusion While the flux relative to the average molar velocity J always means transfer down a concentration gradient, the flux N need not. For example, consider the dissolution of a hydrated salt crystal such as Na2 C03 • lOH2 0 into pure water at 20°C. 9647 mole fraction H 20. 0353 outward to 0 mole fraction N~C03 in the bulk liquid. 0 mole fraction in the bulk liquid.
Mass-transfer operations by Robert E. Treybal