supercritical bio-diesel production through a …...biodiesel by law feed stocks can be grown on...
TRANSCRIPT
-10
-8
-6
-4
-2
0
2
4
6
8
Tem
pe
ratu
re [
°C]
Camelina
Sunflower
50% EtOH:CAM/50%EtOH:SUN
Background Experimental System Analysis and Future Work
Project Goals Find conversion data for 2 oils, 4 alcohols, 2 temperatures and 2 molar ratios Compare produced biodiesel to commercial petro-diesel Create a reaction kinetic model representing the oil and alcohol interaction
Bio-Diesel Production
Traditional2
Batch process involving a acid or base catalyst Requires extensive pre and post process purification involving catalyst
recovery
Supercritical3
Continuous production High temperature and pressure High conversions possible with no catalyst (60% to 70%)
Supercritical with Tin Catalyst Continuous packed bed reactor at high temperatures and pressures
(305 C, 2500 psi) Highest conversions (up to 98%) using a tin or tin-alloy catalyst No catalyst recovery required
Two Methods of Comparison
System Overview
Future work and ApplicationsTest other oil and alcohols (Jatrotha, tert-butyl alcohol, etc.) to expand upon
mathematical modelFind how oil and alcohol combinations correlate to Cetane number and Cloud-PointTest larger system with in-line separations to be built this summer
[1] US Energy Information Administration. 2008[2] Biodiesel Production and Quality. April 26, 2007[3] Norman. Continuous Supercritical Biodiesel Production via a Catalytic Packed Bed Reactor. 2009[4] Supplements to the 2011 Oregon Administrative Rules Compilation. Volume 50, No. 3. March 1, 2011[5] National Biodiesel Board. Biodiesel Fuel Management Best Practices for Transit. November 27, 2007[6] Phillips Petroleum Company, No. 2 Diesel Fuel MSDS. 2002
Safety High pressure system: 2500 psi ( 170 atm) –unique safety hazard Inhalation hazard: temperatures above the normal boiling point of alcohols Flammable reactants and products
Why Biodiesel? Reduce dependence on petroleum-based
fuels Commercial diesel must be blended with
biodiesel by law Feed stocks can be grown on land incapable of
food production. In 2010 over 3,000,000 barrels of petro-diesel
was consumed per day, while only 20,000 barrels of biodiesel was produced per day.1
Product Purification
Product is a mixture of biodiesel, excess alcohol, glycerin, water, and trace impurities. Purified by distillationAlcohol is recovered and recycled
Supercritical Bio-Diesel Production Through a Packed-Bed ReactorSchool of Chemical Biological and Environmental EngineeringTeam Members: Joseph DeWilde, Colin Reed, Keri Robinson
Sponsors: Dr. Nick Wannenmacher, Dr. Dan Euhus PE
How Bio-Diesel is Produced Glycerides from oil converted to esters (bio-diesel)
Variable ValuesOil Camelina, Sunflower
Alcohol Ethanol, Methanol, Iso-Propanol, Tert-ButanolTemperatures [°C] 275, 290, 305
Pressure [psi] 2500Molar Ratio [alcohol:oil] 20:1, 30:1
Cetane Number Quantifies fuel combustionAverage diesel cetane number: 45 (47 is premium in Oregon)4
Cloud-PointTemperature at which fuel becomes cloudyTemperatures below cloud point clog injection systemsAdditives are used to drop cloud point but increase cost of fuelAverage diesel cloud point: 10 °F (with additives)6
Traditional biodiesel cloud point: 34 °F (no additives)5
Bio vs. Petro
Gas Chromatography
Dr. Nick Wannenmacher Dr. Dan Euhus, PEDr. Brian Reed
Kevin HarrisDr. Philip Harding, PEKit Boyle - South Oregon Seed Oils Inc
Acknowledgements
Separates samples and obtains compositions
Used to determine conversion of product
OilR-OH Bio-Diesel
Glycerol
Alcohol + Oil Bio-Diesel + Glycerol
Camelina Oil Chromatograph Overlay
High Pressure Oil Pump
Reactor
Cooling loop and Electrical Box
Aluminum Heating Blocks
Heating Block Temperature
Pre-Heaters
Reactor Pressure
Sample Outlet
High Pressure Alcohol Pump
Hot Plate
Sample
Cooling Water
Cooling Water
v Vapor
Liquid
Samples (from left to right): Camelina &Ethanol Camelina &Methanol Camelina &Iso-propanol Sunflower & Iso-propanol Sunflower &Methanol Sunflower &Ethanol All samples taken at 305 °C
and 20:1 molar ratio
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
2008 2011 2014 2017 2020 2023 2026 2029 2032 2035
Mill
ion
Bar
rels
per
Day
Year
Petro-diesel consumption
Biodiesel production
Average Biodiesel Cloud Point