Desulfurization of Gasoline by S. Kumar IndianOil R&D Centre - PowerPoint PPT Presentation

INDAdept G Technology for Deep Desulfurization of Gasoline by S. Kumar IndianOil R&D Centre Faridabad, India 1 Refining Challenges & Way Forward, April 16-17, 2012 at New Delhi

 Issues in producing ULSG  Options for Gasoline Desulph. Overview  INDAdpt G Process  Breakthrough Curve  SO 2 Removal options  Present status  Summary

Iss ssue ue in producing ucing ULSG SG  Minimum octane loss  Minimum yield loss  Minimum hydrogen consumption  Capability to economically produce ULSG Conventional hydrotreating results in saturation of total olefins and higher octane loss

Op Option tions s for Ga Gasoli oline ne Des esulphu ulphuriza rizatio tion Achieve desulphurization with min. octane loss  Separate octane contributors (LCN) by fractionation followed by HDS of remaining stream (HCN) - (Selective HDS)  Compensate for the octane loss due to HDS by isomerization of saturated hydrocarbons - (Non-selective HDS)  Adsorption (physical/ reactive) TECHNOLOGIES: PrimeG, OATS, SCANfining, CDHydro, ISAL,OCTGAIN, S-Zorb, INDAdept

INDAde Adept pt Process cess Fea eatur ures es  Ideal for deep desulphurisation H 2 of gasoline/ diesel N 2 Air  Proprietary Diesel adsorbent in hydrogen environment  ‘S’ removed by cleavage of 1 2 C-S bond followed by reactive adsorption  Two reactors operated in swing mode of adsorption and Adsorption Regeneration regeneration  Adsorbent regenerated by oxidation of ‘S’ to SO 2 in presence of lean air- nitrogen 5 mixture

INDAde Adept pt Process ocess H 2 O 2

IND NDAde Adept pt G Process cess Fee eed/ d/Prod oduc uct t Prop oper erti ties es: Ideal for S reduction from 1000 to < 10 ppm  RON reduction of 1-2 units  H 2 consumption ~ 0.2 wt%  Suitable for treating Coker/ FCC gasoline  Employs single reaction step 7

cess IND NDAde Adept pt G Process Flow Diagram am Feed H 2 Reactor Recycle Compressor Separator Lt. Gases Flash Drum Product

cess IND NDAde Adept pt G Process Regen ener eration ion Flow Diagram am Make-up Air O 2 /CO 2 /CO Analyzers N 2 N 2 /O 2 H 2 / HC Analyzers Recycle gas N 2 /H 2 Make-up H 2 Water wash column Activation Separator Make-up Water Scrubber/SRU Water Caustic Combustion Separator Make-up Caustic/ Amine Flare H 2 / HC/ O 2 Analyzers Purging Fuel gas CBD Depressurization Separator Feed Storage

INDAdept G Process Regeneration Cycle  Automatic Reactor swing mechanism & necessary safety interlocks  Oxidation & activation steps conducted with compositions below lower inflammability limit. Further purging introduced before these steps  Typical Regeneration Cycle (4-8 days, Temp : 400 – 500 0 C) 10

cess IND NDAde Adept pt G Process Reac actor tor swing ng ope peratio tion n HC/H 2 / O 2 Analyzers Feed/ H 2 HC/H 2 / O 2 Analyzers N 2 Adsorption N 2 /O 2 Activation N 2 /H 2 Combustion Purging H 2 / HC/ O 2 Analyzers Depressurization

Br Brea eakt kthr hrough ough Cu Curve e for or Gasoline asoline De Desul ulfu furiz rizatio tion Gasoline Desulphurization 80 Feed = 60% Coker Gasoline + 40% FCC Gasoline 70 Feed 'S' = 1080 ppm Feed Olefins = 26.5 wt% 60 50 S (ppm) 40 30 20 10 0 0 20 40 60 80 100 120 140 160 180 200 Time on Stream (Hrs)

SO 2 Removal/ Disposal Options  Caustic Scrubber  Integration with SRU SO 2 Containg gas stream from INDAdept 13

INDAdept Process Present Status Process developed after Extensive pilot plant data  generated during last 7 years Scale-up & Commercialization along with Design & Engg.  Consultant (EIL ) Adsorbent scale up & commercialization with Catalyst  Manufacturer (Sud-Chemie India Ltd.) Demonstration unit of 35 TMTPA is under consideration in  one of IOC’s Refineries for reduction of sulfur content in Heavy FCC gasoline from 1000 to 10 ppm 14

Su Summar mmary  Lower consumption of H 2 (0.12 -0.25 % of feed) in INDAdept G  Process can be used by refineries to meet EURO- IV and EURO-V specifications  Lower Plant & Machinery cost  Lower octane loss 15

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