In the first step , the feedstock LPG or light naphtha is contacted in the trayed extractor vessel with an aqueous caustic solution containing UOP 's proprietary liquid catalyst .
It is a two - step process .
In the first step , the feedstock LPG or light naphtha is contacted in the trayed extractor vessel with an aqueous caustic solution containing UOP 's proprietary liquid catalyst .
It is a two - step process .