US 11,999,914 B2
Process and a system for production of multiple grade de-aromatized solvents from hydrocarbon streams
Vasamsetty Naga Veera Hima Bindu, Faridabad (IN); Mainak Sarkar, Faridabad (IN); Ganesh Vitthalrao Butley, Faridabad (IN); Ramesh Karumanchi, Faridabad (IN); Sarvesh Kumar, Faridabad (IN); Madhusudan Sau, Faridabad (IN); Gurpreet Singh Kapur, Faridabad (IN); and Sankara Sri Venkata Ramakumar, Faridabad (IN)
Assigned to INDIAN OIL CORPORATION LIMITED, Mumbai (IN)
Filed by INDIAN OIL CORPORATION LIMITED, Maharashtra (IN)
Filed on Sep. 21, 2021, as Appl. No. 17/481,077.
Claims priority of application No. 202021040820 (IN), filed on Sep. 21, 2020.
Prior Publication US 2022/0089960 A1, Mar. 24, 2022
Int. Cl. C10G 67/06 (2006.01); C10G 7/00 (2006.01); C10G 25/00 (2006.01); C10G 31/00 (2006.01); C10G 45/08 (2006.01); C10G 45/50 (2006.01); C10G 67/14 (2006.01)
CPC C10G 67/14 (2013.01) [C10G 7/00 (2013.01); C10G 25/00 (2013.01); C10G 31/00 (2013.01); C10G 45/08 (2013.01); C10G 45/50 (2013.01); C10G 67/06 (2013.01); C10G 2300/1037 (2013.01); C10G 2300/202 (2013.01); C10G 2300/207 (2013.01); C10G 2300/302 (2013.01); C10G 2300/308 (2013.01); C10G 2300/4006 (2013.01); C10G 2300/4012 (2013.01); C10G 2300/4018 (2013.01); C10G 2300/80 (2013.01); C10G 2400/30 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A process for producing a plurality of ultra-low aromatic chemicals from a plurality of low value hydrocarbon streams, the process comprising:
subjecting a hydrocarbon feedstock-1 to a first hydrotreating in a first reactor unit, wherein the hydrocarbon feedstock-1 is doped with 50-500 ppmw of a nitrogen compound, wherein the first reactor unit is loaded with a dual functional catalyst system, wherein the dual functional catalyst system is capable of desulfurization and hydrogenation, wherein the first hydrotreating provides a first effluent; wherein sulphur content in the first effluent is below 2 ppmw;
maintaining a Weighted Average Bed Temperature (WABT) between 250° C. and 350° C., a hydrogen partial pressure between 35-75 bar g, a liquid hourly space velocity (LHSV) in a range of 0.5-1.5−1, a gas to oil ratio in a range of 300-800 Nm3/m3 in the first reactor unit;
stripping the first effluent in at least one stripper unit to remove at least one dissolved gas from the first effluent to provide a stripper effluent, wherein H2S content in the stripper effluent is below 0.05 ppmw;
mixing the stripper effluent with a hydrocarbon feedstock-2 to form a combined stream-1, wherein the hydrocarbon feedstock-2 has a boiling range between 100° C.-220° C., an iso-paraffin content between 50 wt %-80 wt %, and a naphthenic content between 20 wt %-50 wt %, wherein, sulphur and aromatic content of the hydrocarbon feedstock-2 is lower than the sulphur and aromatic content of the first effluent;
subjecting the combined stream-1 to a second hydrotreating in a second reactor unit, wherein the second reactor unit is loaded with a hydrogenation catalyst system having aromatic saturation properties, wherein the second hydrotreating provides a second effluent;
maintaining a WABT between 150° C. and 250° C., a hydrogen partial pressure between 25-65 bar g, an LHSV in a range of 0.2-1.5−h, a gas to oil ratio in a range of 250-900 Nm3/m3 in the second reactor unit;
mixing the second effluent of the second reactor with Feedstock-3 to form a combined stream-2, wherein the hydrocarbon Feedstock-3 has a boiling range between 65° C.-160° C., an iso-paraffin content between 50 wt %-80 wt %, wherein, sulphur and aromatic content of the hydrocarbon Feedstock-3 is lower than the second effluent;
subjecting the combined stream-2 to an adsorption unit, wherein the aromatic molecules are selectively adsorbed from the combined stream-2 enriching it with paraffin, iso-paraffin and naphthenic molecules wherein the selective adsorption is based on a difference in a polarity of molecules to result in a third effluent from the adsorption unit;
subjecting the third effluent from the adsorption unit to a distillation unit to separate out the plurality of ultra-low aromatic chemicals from the third effluent by distillation.