US 11,739,277 B2
Process for removal of sulfur and other impurities from olefinic liquefied petroleum gas
Saravanan Subramani, Haryana (IN); Vimal Kumar Upadhyay, Haryana (IN); Prosenjit Maji, Haryana (IN); Reshmi Manna, Haryana (IN); Vatsala Sugumaran, Haryana (IN); Mahalingam Vanamamalai, Haryana (IN); Madhusudan Sau, Haryana (IN); Gurpreet Singh Kapur, Haryana (IN); and Sankara Sri Venkata Ramakumar, Haryana (IN)
Assigned to Indian Oil Corporation Limited, Mumbai (IN)
Filed by Indian Oil Corporation Limited, Mumbai (IN)
Filed on Mar. 17, 2021, as Appl. No. 17/204,732.
Claims priority of application No. 202021011666 (IN), filed on Mar. 18, 2020.
Prior Publication US 2021/0292670 A1, Sep. 23, 2021
Int. Cl. C10L 3/10 (2006.01); C10L 3/12 (2006.01); B01D 3/14 (2006.01); B01J 39/05 (2017.01); B01J 39/19 (2017.01)
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
OG exemplary drawing
 
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.