CPC C10L 3/12 (2013.01) [B01D 3/14 (2013.01); B01J 39/05 (2017.01); B01J 39/19 (2017.01); C10L 3/103 (2013.01); C10L 2290/141 (2013.01); C10L 2290/543 (2013.01); C10L 2290/548 (2013.01)] | 14 Claims |
1. A process for removal of sulfur and other impurities from a mixed olefinic Liquefied Petroleum Gas (LPG) stream, the process comprising:
(a) feeding the mixed olefinic LPG stream along with an oxygenate component to a reactor comprising a cation exchange resin catalyst,
wherein olefins present in the mixed olefinic LPG stream react with the sulfur present in mercaptan impurities to form alkyl sulfides and dialkyl sulfides;
wherein the olefins present in the mixed olefinic LPG stream react to form a liquid product comprising dimers, trimers, and tetramers; and
wherein the liquid product reacts with the sulfur present in mercaptan impurities and form alkyl sulfides and dialkyl sulfides;
(b) subjecting the oxygenate component, the alkyl sulfides and dialkyl sulfides along with the liquid product and a treated LPG stream to separation in a fractionating column, wherein the oxygenate component is separated and recycled back to the reactor along with a makeup oxygenate stream;
(c) sending the alkyl sulfides and alkyl disulfides along with the liquid product from the fractionating column to a hydrodesulfurization unit in a refinery, a petrochemical complex or to a fluid catalytic cracking unit; and
(d) routing the treated LPG stream from top of the fractionating column for further utilization,
wherein the sulfur content is reduced from 30-900 ppmw in the mixed olefinic LPG stream to 3-10 ppmw in the treated LPG stream.
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