In an ammonia manufacturing facility, the necessary hydrogen is generated from methane. The facility consists of the following process units -
$\text{P}$: Methanator, $\text{Q}$: $\mathrm{CO}$ shift convertor, $\text{R}$: $\mathrm{CO}_{2}$ stripper, $\mathrm{S}$ : Reformer, $\text{T}$: Ammonia convertor
The correct order of these units, starting from methane feed is
- $\mathrm{S}, \mathrm{Q}, \mathrm{R}, \mathrm{P}, \mathrm{T}$
- $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}, \mathrm{T}$
- $\mathrm{S}, \mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{T}$
- $\mathrm{P}, \mathrm{S}, \mathrm{T}, \mathrm{Q}, \mathrm{R}$