Linde's Rectisol
Linde Rectisol® Wash Process 2nd International Freiberg Conference on IGCC & XtL Technologies
Linde Engineering
8th -12th May, 2007 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Linde’s Rectisol® Wash Process Linde Engineering Acid Gas Removal is an Important Process Step in the Production of Synthesis Gas
Main Components in the Feedgas Acid Components in the Feedgas ¾ H2 ¾ CO2 ¾ CO ¾ H2S ¾ COS
⇒ Shall Remain in the Feedgas ⇒ To be Removed
Impurities in the Feedgas
¾ HCN ¾ NH3 ¾ Metal Carbonyls
¾ H2O
⇒ Removed upstream the Process
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 2 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® is Physical Wash Process using Methanol as Solvent.
Rectisol® Wash Process
¾ Physical Wash Process, whereas the Acid Gas components are solved in the solvent ¾ Methanol is used as solvent ¾ Selective Removal of H2S and CO2 ¾ Excellent Handling of Trace Components
Characteristics of Methanol ¾ High Solubility of the Acid Gas ¾ Low Solubility of the Main Gas Components ¾ High Loading Capacity
¾ Cheap and readily available solvent ¾ Low corrosiveness ¾ Low vapour pressure ¾ Low methanol losses
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 3 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Higher Feedgas Pressure Reduces the Utility Consumption Costs Significantly.
Influence of Feedgas Pressure
V % Utility Consumption WM ≈ 180 165% p ⋅λi 160
140
120 100% Effect of Higher Feed Gas Pressure 100 76.5% ¾ Low Solvent Circulation Rate 80 60 ¾ Low Utility Consumption 40 20
0 ¾ Smaller Column Diameter 25 bar 50 bar 75 bar Feedgas Pressure ¾ Higher Wall Thickness ¾ Negligible Influence on Equipment Cost
⇒ High Operation Pressure is Favorable for the Rectisol® Process
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 4 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering The Flexibility of Rectisol® results from the High Selectivity of Methanol to Absorb Syngas Components.
Solubility Coefficient λi of various gases in Methanol at ambient pressure
Solubility 1000 [Nm³/to.bar]
100 H2S CO2 COS 10
1 CO
0,1 H2
0,01 -60 -40 -20 0 20 40 Temperature [° C]
⇒ Low Operation Temperature is Favourable for the Rectisol® Process
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 5 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® allows a wide Range of Application.
Feedgas Source Unshifted and/or Shifted Feedgas Coal or Oil Gasification, Heavy Residue Oil
Feedgas Flow Rate 11,000 – 450,000 Nm³/h in one train
Feedgas Pressure 20 – 120 bar high pressure preferable ( 30 – 80 bar)
CO2 Content in Feedgas > 3 mol% preferable > 10 mol%
Advantages selective H2S/COS and CO2 removal possible wide spread product range
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 6 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® is a very Flexible Process to achieve a wide Range of Product and By-Product Quality.
Simplified Process Flow Diagram
Absorption Desorption H2S Enrichment Regeneration Feedgas H2S-Fraction
c.w.
Methanol Refr. Injection
steam
Tailgas
Methanol/Water CO2 Mixture
Syngas Stripping N2
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 7 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® is an Excellent Process to Produce Hydrogen and IGCC Fuelgas.
Block Diagram to Generate IGCC Fuelgas and Hydrogen
CO2/N2 Ventgas
Oil/Coal Pure Hydrogen PO CO Shift Rectisol I PSA
Oxygen Tailgas Air LP-Nitrogen Regen. H2S Fraction ASU System
el. Power Gas Turb. Rectisol II (IGCC) Exhaust
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 8 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® is an Excellent Process to Produce IGCC Fuelgas.
Block Diagram to Generate IGCC Fuelgas without CO2
Oil/Coal el. Power Fuel Gas Gas Turb. PO CO Shift Rectisol (IGCC) Exhaust Oxygen Air Claus Regen. H2S Fraction ASU System
CO2 Storage CO2 CO2 Compr.
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 9 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® Guarantees Highest Product Quality.
Fuel Gas for IGCC CO2 Product
general typical general typical < 5 vppm CO2 1-2 mol% 1) ≥ 98.5 mol% ≥ 95 mol% 2) up to 5 mol%
H2S + COS < 0.1 vppm 2 -10 vppm 2 – 10 mg/Nm³ 5 – 50 mg/Nm³
H2O < 0.1 vppm < 0.1 vppm < 1 vppm < 1 vppm
100 – 200 vppm Methanol 50 – 150 vppm 50 – 150 vppm 100 – 200 vppm 20 vppm 3)
Pressure Δp ~ 2 bar Δp ~ 2 bar 1.7 – 3.3 bar(a) 1.2/3.2 bar(a) 4)
1) CO2 recovery rate 90 – 97% 3) with Additional Water Wash Column
2) no vent gas, N2 < 4 mol% 4) adjusted to compressor design
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 10 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Air Separation Technology Applied to CTL / Linde Core Business
Consumers - Synthetic Diesel - Synthetic Naphta CTL - Lubricants - Alpha-Olefins
Gasification Island - Methanol -MTO CTC - Acetic Acid -OxoChemicals - Refinery Coal - Hydrogenation POX Rectisol H2 - Ammonia -Energy
O 2 SNG
H2SCO2 ASU + trace components -low/zeroCO2 IGCC emission power plants
Linde Engineering core business
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 11 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde’s Rectisol® Wash Process Linde Engineering Rectisol® is an Excellent Technology to Treat Syngas from Gasifications.
Advantages in General
¾ Flexible process concerning feedstocks and products
¾ High absorption capacity of Methanol low solvent circulation rate low energy consumption
¾ Proven in many plants world-wide extended experience in handling of trace components
¾ Cheap and readily available solvent
¾ High One-Train capacity
¾ Favourable combination with a cryogenic process
Linde AG Linde Engineering Division The 2nd International Conference on IGCC & XtL Technologies 12 Dr. A. Prelipceanu, Dr. H.-P. Kaballo, U. Kerestecioglu Freiberg, 8th –12th May, 2007 Linde Kindly Thanks You for Your Attention.
Linde Engineering