An open e a S0 imol ofs dilute rces solution of An open kettle contains 50...

 

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An open e a S0 imol ofs dilute rces solution of An open kettle contains 50 kmol of a dilute aqueous solution of methanol (2 mol% of methanol), at the bubble point, into which steam is con- tinuously sparged. The entering steam agitates the kettle contents so that they are always of uniform composition, and the vapor produced, always in equi- librium with the liquid, is led away. Operation is adiabatic. For the concen- trations encountered it may be assumed that the enthalpy of the steam and evolved vapor are the same, the enthalpy of of the liquid in the kettle is essen- tially constant, and the relative volatility is constant at 7.6. (a) Show that under these conditions, V = (a- 1)(xF-xw) (6-119) 6.14. Diferveal stram distillation n kettle of meanol where V = moles of steam required. methanol tiuusly spargd. The ctering sieam agites the kenle cosents so that they are always of utiform composition, and the vapor peoduced, always ie eg libriam with the liguid, is led away. Operatioe is adiabatic. For the concen trations encoutered it may be assumed that the enthalpy of the steam and evohed vapur ae the same, the enthalpy of of the liquid in the kenle is essen tially constant, and the relative volatiliny is contant a 76 the bubble point, into which steam is con (b) Compute the quantity of steam to be introduced in order to reduce the con- centration of methanol to 0.1 mol%. (a) Show that under these conditions. Answer: 20.53 kmol An open e a S0 imol ofs dilute rces solution of An open kettle contains 50 kmol of a dilute aqueous solution of methanol (2 mol% of methanol), at the bubble point, into which steam is con- tinuously sparged. The entering steam agitates the kettle contents so that they are always of uniform composition, and the vapor produced, always in equi- librium with the liquid, is led away. Operation is adiabatic. For the concen- trations encountered it may be assumed that the enthalpy of the steam and evolved vapor are the same, the enthalpy of of the liquid in the kettle is essen- tially constant, and the relative volatility is constant at 7.6. (a) Show that under these conditions, V = (a- 1)(xF-xw) (6-119) 6.14. Diferveal stram distillation n kettle of meanol where V = moles of steam required. methanol tiuusly spargd. The ctering sieam agites the kenle cosents so that they are always of utiform composition, and the vapor peoduced, always ie eg libriam with the liguid, is led away. Operatioe is adiabatic. For the concen trations encoutered it may be assumed that the enthalpy of the steam and evohed vapur ae the same, the enthalpy of of the liquid in the kenle is essen tially constant, and the relative volatiliny is contant a 76 the bubble point, into which steam is con (b) Compute the quantity of steam to be introduced in order to reduce the con- centration of methanol to 0.1 mol%. (a) Show that under these conditions. Answer: 20.53 kmol

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