Ethanol of 50 % purity is used in an esterification column. The quality of the ethanol presents mass concentration fluctuations of ± 10 %. Compute the measuring domain of the bubbling differential...

Ethanol of 50 % purity is used in an esterification column. The quality of the ethanol presents mass concentration fluctuations of ± 10 %. Compute the measuring domain of the bubbling differential pressure transducerΔp, used for the concentration measurement. The following parameters are given: immersion difference between the tubes is Δh = 0.1 m, the reference liquid is pure ethanol at the temperature of 20
^∘C. The differential pressure is converted in a standard signal ranging from 4 mA to 20 mA by an electronic transmitter. Compute the errors caused by the summer-winter temperature changes of ΔT^∘
= 30 K. The density-concentration relationship is presented in Tab. 7.5, the volumetric thermal expansion is 𝛾 = 10⁻³
K⁻¹
and the density at the temperature of T^∘
= 303 K is ρ_et
= 0.781 kg/dm³
for the pure ethanol.