PRODUCTION RATEType of liquid (A) = benzeneType of liquid (B) = tolueneTop (T)

m=340kgmol/hx mol Ay mol B

TANK

Feed (F)

m=400 kgmol/h70% mol A30% mol b

Bottom (B)

m= 60kgmol/h10% mol A90 %mol B

OVERALL BALANCEF = T + B 400kgmol/h = T + BMaterial Balance for liquid A(0.7*400 kgmol/h) = (0.10*60) + (x*340 kgmol/h)x = 0.806 mol/mol of A at topy at the top = (1-0.806)*100% = 19.6%DESIGN OF MIXING TANKThe dimensions of the liquid content of a vessel and the dimensions and arrangement of impellers, baffles and other internals are factors that influence the amount of energy required for achieving a needed amount of agitation or quality of mixing. The internal arrangements depend on the objectives of the operation. A basic range of design factors, however, can be defined to cover the majority of cases.TANKDIMENSION

IMPELLER Side entering propeller mixers are mounted horizontally on the sides of the tank, near the bottom. The number used to mix the tank depends on the viscosity of the liquid and the ratio of the liquid depth to the tank diameter.Tank diameter, (m)60

Number of impeller1234 or 5

These mixers produce spiraling circulation patterns.

Figure 2.1: Possible flow patterns of a side entering propeller mixing application

BAFFLE A baffle width one-twelfth the tank diameter, w = D/12. A length extending from one half the impeller diameter, d/2, from the tangent line at the bottom to the liquid level. Four axial baffles at equal spacing