Synthesis Gas to Gasoline Production ChE 397 Senior Design Group Alpha Ayesha Rizvi Bernard Hsu Jeff Tyska Mohammed Shehadeh Yacoub Awwad 2011.01.25 Group Members and Roles Jeffrey Tyska Group Leader Ayesha Rizvi Research Bernard Hsu Technical Writer Mohammed Shehadeh Webmaster Yacoub Awwad Calculation Expert Gasoline Prices All Time High: $4.11/gal General Increasing Trend http://www.eia.doe.gov/petroleum/data_publications/wrgp/mogas_home_page.html Peak Production 1970 Defeyes, Kenneth S. Hubbert's Peak: the Impending World Oil Shortage. Princeton: Princeton UP, 2003. 113-131. World Oil Production http://www.princeton.edu/hubbert/images/cera-chart.gif Peak World Production Methanol as a Feedstock Different Sources of Methanol Natural Gas Coal Biomass Why Syn Gas to make Methanol ? Economical Efficient Municipal Solid Waste Why Gasoline and Mobil Process? Existing infrastructure Established demand Reduced SOx emissions Fairly easy to scale Fairly renewable feedstock Energy Independence SO2 Environmental Review http://www.usstcorp.com/solutionsenvironment.html Competing Processes Fischer-Tropsch (2n+1) H2 + n CO → CnH(2n+2) + n H2O Oil Tar Sands 43% http://portland.indymedia.org/media/ima ges/2010/12/404850.jpg http://tonto.eia.doe.gov/country/index.cfm?view=production Syngas to Methanol Dehydration (Alumina Catalyst) Dimethyl Ether 2H2 + CO Synthesis + + + Process Equations Possible alternative fuel dehydration 2 CH3OCH3 + H2O ZSM-5 C5+ + H2O Zeolite Socony Mobil 5 First synthesized in 1972 U. S. Patent 3,702,886 (Mobil Oil Company 1975) NanAlnSi96–nO192·16H2O (0<n<27) Pentasil unit = 8 five-membered rings Isomerization Methane diffusion through zeolite catalyst http://www.sciencephoto.com/images/ download_lo_res.html?id=655060020 http://image.absoluteastronomy.com/images/topicima ges/z/zs/zsm-5.gif Gasoline grade High Quality Similar Properties Very low Sulfur 2% Durene http://www.exxonmobil.com/Apps/RefiningTechnologies/files/sellsheet_09_mtg_brochure.pdf Constraints of the MTG process Highly Exothermic High concentration of durene that causes carburetor “icing” Catalyst aging • • Reversible- caused by coked catalyst Irreversible- caused by the steam Band aging • Allows the reactant to break through the bed unconverted Unconverted methanol may be lost from dissolving in water Inability to directly produce diesel and jet fuel. Scale 1800 metric tons syngas / day 900 metric tons gasoline / day Newton County Landfill 265 Acres Next to gasifier 50-60% plant thermal efficiency Losses mainly from methanol production Block Flow Diagram CO H2 Methanol Reactor MeOH DME DME Reactor H 2O MeOH Methanol to Gasoline Reactors Crude Gasoline H2O, trace contaminants Wastewater Durene Reactor H2 treatment Heavy Gasoline (less durene) Final Storage To consumer or refineries for final blending Light Gas Blending Additives Heavy Gasoline Distillation Columns HVP Gasoline Storage Light Gasoline End! ZSM-5 In the 1970's, Mobil synthesized a new zeolite catalyst (ZSM-5), which became a key element in the MTG process. Zeolites are porous, crystalline materials with three dimensional framework composed of AlO4 and SiO4 tetrahedral. ZSM-5 catalyst produces the right kind of shape and size selectivity properties suitable for gasoline synthesis. Methane diffusion through zeolite catalyst http://www.sciencephoto.com/images/ download_lo_res.html?id=655060020 Oil Consumption in the USA 20,802,162 (2005) 18,686,223 (2009) http://tonto.eia.doe.gov/country/ country_energy_data.cfm?fips=US Syngas MeOH reactor 270 C, 5 MPa H2, CO, CO2, H2O MeOH Crude MeOH DME Reacto r Flash separator Cooler CO, H2, CO2 Hot Effluent Cooled Effluent Additives *1 Gasoline Storage Gasoline Separator Blending Liquid HC Cooler HVP Gasoline Cool Effluent For Sale Recycle Gas Liquid HC Heavy Gasoline Storage Light Gasoline H2 LPG *2 Cooler Treated Heavy Gasoline *1 – MTG Reactors *2 – Mix of gas, water and light HCs *3 – Boilers and Condensers not M *1 T G Water HVP Storage Light Gasoline Storage *1 M T G M *1 T G Durene Reacto r Dis t Col. 3 HVP Gasoline *3 Dis t Col. 2 *3 Liquid HC Heavy Gasoline Liquid HC Dis t Col. 1 *3 M *1 T G Environmental Review • Production of methanol from synthesis gas generates a limited pressure to the environment. • Methanol is a compound of relative low toxicity. Environmental & • All plant waste effluents will be regularly analyzed and checked to meet environmental restrictions and conditions. Global Safety sintankimya.com ZSM-5 Catalyst • In the 1970's, Mobil synthesized a new zeolite catalyst (ZSM-5), which is a key element in the MTG process. • Zeolites are porous, crystalline materials with three dimensional framework composed of AlO4 and SiO4 tetrahedral. • ZSM-5 catalyst produces an unusual shape and has size selectivity properties suitable for gasoline synthesis. Methane diffusion through zeolite catalyst http://www.sciencephoto.com/images/ download_lo_res.html?id=655060020 Syngas to Methanol • The overall reaction in which methanol is produced from synthesis gas is summarized by the following equation: 𝐂𝐎𝟐 + 𝐂𝐎+ 𝟓𝐇𝟐 Cu-Zn → 𝟐𝐂𝐇𝟑 𝐎𝐇 + 𝐇𝟐 𝐎 + heat • Cu-Zn is the Copper – Zinc Catalyst used in the reaction. • The methanol produced contains a large range of impurities which have to be removed to produce methanol of chemical grade quality. • In addition, side reactions occur during methanol production, such as the generation of higher alcohols (ethanol, propanol, butanol) and alkanes. • http://nzic.org.nz/ChemProcesses/energy/7D.pdf http://www.scribd.com/doc/7140653/Reactions-of-Synthesis-Gas http://www.scribd.com/doc/7140653/Reactions-of-Synthesis-Gas