Question

Fill in the blank: _____ molecular weight olefins are generally hydrogenated in the liquid phase.

(a) Lower

(b) Higher

(c) Moderate

(d) None of the mentioned

The question was posed to me at a job interview.

I'd like to ask this question from Catalytic Hydrogenation in portion Hydrogenation of Unit Processes

Answer 1

The correct choice is (b) Higher

To elaborate: Higher-molecular-weight olefins are generally hydrogenated in the liquid phase unless their volatility is sufficient at the temperature of hydrogenation (150-200°C), in which case the reaction may be conducted in the vapour phase.