## What is Rayleigh equation in distillation?

An equation that relates the quantity to the concentration of the more volatile component in *batch distillation. The equation is formulated from an unsteady-state material balance in which vapour leaving the still is in equilibrium with the liquid.

**How is distillation rate calculated in a batch reactor?**

Need to distill out 1 KL of methanol in a batch reactor GLR of capacity 5 KL, reaction mass volume is 4 KL(i.e., 80% occupancy), now i need to calculate the time for distillation. Available heat transfer area = ( 4 / 5 ) * 12.41 = 9.93 Sq. m, Thermal conductivity of a MSGL surface is 1.2 w/m.k = 0.029 KCal/m.

**What is Rayleigh equation used for?**

The Rayleigh Equation is useful in the analysis of simple distillation, as it shows how the concentration and quantity are related. As the process is unsteady state in nature, the derivation is based on a differential approach to changes in concentration with time.

### What causes Rayleigh scattering?

Rayleigh scattering results from the electric polarizability of the particles. The oscillating electric field of a light wave acts on the charges within a particle, causing them to move at the same frequency. The particle, therefore, becomes a small radiating dipole whose radiation we see as scattered light.

**How do I find my Rayleigh number?**

The Rayleigh number is simply defined as the product of the Grashof number, which describes the relationship between buoyancy and viscosity within a fluid, and the Prandtl number, which describes the relationship between momentum diffusivity and thermal diffusivity.

**What is the boil up rate in batch distillation?**

1.1 Power and Boil-up Rate The boil-up rate is 0.655 L/hr at a power of 0.5 KW and the pressure drop was measured to be 58 mmH2O.

#### How do you calculate the heat load of a reactor?

Heat load on condenser = M x ƛ = 2000 x 0.9 x 100 = 180000 KCal, But condenser will also cool the condensed liquid, so to compensate that consider 20% of total latent heat load = 180000 x 1.2 = 216000 KCal. Let the total mass be 500 L, Again sensible heat = 500 x 0.9 x 0.5 x (65 – 5) = 13500 Kcal.

**What is multistage batch distillation?**

Description. Multi-stage batch distillation is simulated using animation. Ten kmol of a binary mixture (components A and B, with B being the more volatile component) are placed in a batch still. Use the “initial mole fraction B” slider to set the initial composition of the still.

**When should batch distillation be used?**

Batch distillation is used when the plant does not run continuously and batches must be completed in one or two shifts (8 to 16 h). It is often used when the same equipment distills several different products at different times. If distillation is required only occasionally, batch distillation is the usual choice.