Yield conversion and selectivity

In chemical reaction engineering, "yield", "conversion" and "selectivity" are terms used to describe ratios of how much of a reactant was consumed (conversion), how much desired product was formed (yield) in relation to the undesired product (selectivity), represented as X, Y, and S.

1. Is selectivity same as conversion?
2. What is selectivity in a reaction?
3. What is the formula for selectivity?
4. What is selectivity in material balance?

Is selectivity same as conversion?

So the selectivity may be defined as the conversion of the reactant to the desirable product divided by the overall conversion of the reactant. It may also be stated as the rate of conversion of the feed to the desired product divided by the overall conversion rate of the feed.

What is selectivity in a reaction?

DEFINITION. The selectivity of a reaction is the ratio of the desired product formed (in moles) to the undesired product formed (in moles).

What is the formula for selectivity?

Selectivity usually is abbreviated with the Greek letter α, and is calculated as: α = k₂ / k₁ where k₁ and k₂ are the retention factors, k, of the first and second peaks of a peak pair.

What is selectivity in material balance?

4 – Selectivity. Selectivity is defined as the moles of desired products formed divided by the moles of undesired products formed.