Production and Purification of Biodiesel Using Ion ... · Production and Purification of Biodiesel...
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Production and Purification of Biodiesel Using Ion Exchange
Resins: A new Strategy for Cleaner Biodiesel
Mohamed Mahmoud Nasef1,2, Masoumeh Zakeri2 and Zuriati Zakaria1*
1Department of Environmental Engineering and Green Technology, Malaysia-Japan International Institute of Technology,
2Institute of Hydrogen Economy, International Campus, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
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1.AG-GProjectaimedtosetupaneduca6onalIns6tuteinMalaysiaofferingJapaneseStyleEngineeringEduca6onblendedwithMalaysiadis6nc6venessforsustainableindustryandsociety
2.LeadinginacademicandresearchexcellenceinElectronics,Precision,Environmental&GreenEngineeringandManagementofTechnology
MALAYSIAJAPANINTERNATIONALINSTITUTEOFTECHNOLOGY
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Innovative Kohza (iKohza)
iKohza
(EGT)
Metabolic Engineering
and Molecular Biology
(MEMO-Bio) Air
Resources
Ecological Engineering
(EE)
Chemical Energy
Conversions and
Applications (CHECA)
Centre of Lipid
Engineering and Applied
Research (CLEAR)
3
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4 http://biomass.ucdavis.edu/materials/forums%20and%20workshops/f2008/1.3_%20Alison%20Goss%20Eng.pdf
DOE
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Biodiesel • Alternative fuel for diesel engines • Made from vegetable oil or animal fat • Meets health effect testing (CAA) • Lower emissions, High flash point (>300F), Safer • Biodegradable, Essentially non-toxic • Renewable • It can be blended in any concentration with diesel-oil • Chemically, biodiesel molecules are mono-alkyl esters produced usually from
triglyceride esters Fatty Acid
Alcohol Glycerin
Vegetable Oil
Biodiesel FA
FA FA
FA
http://www.slideshare.net/saurabhkumarverma19/biofuel-33608124
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** B100 (100% biodiesel)
Relative Emissions: Diesel and Biodiesel
0 20 40 60 80 100 120 Total Unburned HCs
CO
Particulate Matter
**NOx
Sulfates
PAHs
n-PAHs
Mutagenicity
CO2
Percent
B100 ** B20 Diesel
http://www.slideshare.net/saurabhkumarverma19/biofuel-33608124
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Relative Greenhouse Gas Emissions
0 20 40 60 80 100 120 140 160
Gasoline
CNG
LPG
Diesel
Ethanol 85%
B20
Diesel Hybrid
Electric
B100
Data from “A Fresh Look at CNG: A Comparison of Alternative Fuels”, Alternative Fuel Vehicle Program, 8/13/2001
B100 = 100% Biodiesel B20 = 20% BD + 80% PD
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Life cycle of diesel versus biodiesel
In 2013, the world biodiesel production stands at about 37 million cubic meters distributed. USA, Brazil, Germany, Indonesia followed by France are the five producers for biodiesel with 51.5% of the total world production
World biodiesel production in 2013
“Biodiesel: 2014 World Market Outlook and Forecast up to 2018,” Jan, 2014.
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Palm oil Rape seed oil, Soyabean oil, Sunflower oil, Canola oil, Coconut oil, Jatropha nut oil, Used Cooking Oil, Animal fats
Conversion
• High viscosity • Poor combustion properties
• Low viscosity • Excellent combustion properties
Raw oil sources of biodiesel
Bio- Diesel
http://www.macquarieoils.com/ 9
Biodiesel production
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Triglycerides
Fatty-Acids:
Micelles, phospholipids, proteins, mineral salts Others:
> 95%
0.1- 5%
Raw oils chemical composition
O
O
O
O O
O
OH
O
< 1%
http:// www.picse.net/CD2011/biodiesel/convertingFatsToBiodiesel.htmlable 10
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Biodiesel Production methods
Purified Triglycerides
> 95%
OCH3
O
OH HO OH
Biodiesel phase
Glycerine phase
NaOCH3 CH3OH
Top Layer
Bottom Layer
*
O
O O
* The catalyst Na-methoxide is also a drying agent and should be used instead of NaOH to suppress the formation of soap
Transesterification • Most common production method • Uses vegetable oils and animal fats
as feed stocks • The reaction of a fat or oil with an
alcohol to form esters (biodiesel) and glycerol
Four main production methods • Direct use and blending • Micro emulsions • Thermal cracking • Transesterification
Journal of Sustainable Energy & Environment 3 (2012) 35-47
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The main obstacle for biodiesel preparation with hemogeneous base: Soap formation
Free fatty acid (FFA)
< 5%
OH
O
Methanol
NaOCH3
CH3OH
The FFA content of the triglycerides should be maintained below 0.5% to minimize soap formation and maximize BD selectivity
ONa
O
Soap
+
+
http://www.picse.net/CD2011/biodiesel/convertingFatsToBiodiesel.html
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Glycerine + Salts
Transesterification
Low-acid triglycerides
MeOH MeONa HCl
Separation
MeOH + Gly. + salts
Water +
Glycerine + Salts
Water
Water strip
Pure methyl esters
(Biodiesel)
Antioxidant
Water wash
Water strip
MeO
H Strip
Raw oils with free fatty acids
Esterification
Methyl ester phase
Glycerine phase
Glycerine purification
Classical biodiesel production process
http:// www.picse.net/CD2011/biodiesel/convertingFatsToBiodiesel.htmlable
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Catalysts used in transesterification reaction for biodiesel production
Classical process
RSC Advances, 2013, 3, 9070
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Disadvantages of Homogenous Basic Catalyst Technologies for Biodiesel Production
Disadvantages: • Large amount water • Acid usage in product separation • Saponification occurs • Residual KOH in biodiesel creates excess ash
content in the burned fuel/engine deposits/high abrasive wear on the pistons and cylinders
• Addition separation process to remover catalyst traces
Alternative solid polymer heterogeneous catalyst can eliminate/reduce such problems
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Ion Exchange Resins as Heterogeneous Catalyst Commercial ion exchange resins are usually based on the polystyrene crosslinked with divinylbenzene, which are classified based on the type of functional group and % of cross-linkages Anionic Exchangers - Strongly basic – functional groups derived from quaternary ammonia compounds, R-NH2
+OH-. - Weakly basic - functional groups derived from primary and secondary amines, R-NH3OH or R-R’-NH2OH. Cationic Exchangers • Strongly acidic: functional groups derived from strong acids e.g., R-SO3H
(sulfonic). • Weakly acidic – functional groups derived from weak acids, e.g., R-COOH
(carboxylic). Crosslinking to make ion exchange resin
Chem. Rev. 2008, 109, 515
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General structure of ion exchange resin Advantages of using ion exchange resins in biodiesel production Low-cost Chemical stability Durability and physical strength Adaptable in any type of reactors Negligible to low metal leaching Ease of catalyst recycle especially for macroporous resins Commercially available in several varieties Defined amounts of anchoring sites Ease regenerated and separated because of their relatively large particle size Applied as catalysts at large scale Activity, selectivity and catalyst efficiency are comparable with homogeneous catalysts Ease of handling Ease immobilization procedure Compatible with many reaction solvents including water
n m
X-Y
X YSO3- H+
N(CH3)3+ Cl-CO2 - Na+NH3 + OH-
Chem. Rev. 2008, 109, 515
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Impurity Effect
FFA Corrosion Low oxidation stability
Water Hydrolysis (FFA formation) Corrosion Bacteriological growth (filter blockage)
Methanol Low values of density and viscosity Low flash point (transport, storage and use problems)
Corrosion of Al and Zn pieces
Glycerides High viscosity Deposits in the injectors (carbon residue)
Crystallization
Metals (soap, catalyst) Deposits in the injectors (carbon residue) Filter blockage (sulphated ashes)
Engine weakening
Glycerol Settling problems
Increase aldehydes and acrolein emissions
Effects of impurities on biodiesel production
3. Purification of biodiesel
Chemical Engineering Journal 2008, 144, 459
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Pure methyl esters
(biodiesel)
Transesterification
Glycerine + Salts
MeOH MeONa
Separation
MeOH + glycerine
Glyc. adsorption desorption
Methyl ester phase
Glycerine phase
Antioxidant
MeO
H Strip
Ion exchange resin
Glycerine purification
Esterification
Raw oils with free fatty acids
Low-acid triglycerides
HCl
Purification with Lewatit as a ion exchange resin
www. lewatit.com
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Water +
glycerine + salts
Water
Water strip
Water wash
Water strip
Glyc. adsorption desorption
Purification with water wash Purification with ion exchange resin
One column of resin completely replaces the water washing system!!
Ion exchange resin vs water wash
www. lewatit.com
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Comparison between ion exchange resin and water wash for biodiesel purification
Ion exchange resin (Purolite) Water Wash Operating Cost ($0.0037/litre) Reported cost ($0.021/litre)
Low maintenance dry system Medium to High maintenance Multiple washes
No need to filter Minimal filtration still Heavy Filtration needed necessary
Low energy High pumping and drying energy
No waste disposal costs Waste water treatment or water disposal issues
No water required Several water wash stages required
Heller, T. “Ion Exchange in Biodiesel Production”. Purolite Company
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Application mode of ion exchange resin
Alternate loading and washing
1. Biodiesel + glycerine 2. Washing with MeOH
1. Purified biodiesel 2. MeOH + glycerine
B. MeOH tank or MeOH strip
A. Transesterification tank
Ion Exchange Resin
www. lewatit.com
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July 7, 2010 DS Sustainable Fuels 23
Preparation of alternative ionic resins in fibril form
Commercial ion exchange resins having microporous structure have following disadvantages: - Diffusion limitation when used in packed-bed column - Slow kinetics - Slow regeneration process - High cost
It is interesting to develop solid polymer/ionic catalyst in fibril form to be used for catalysis of triglycride and purification of crude Also, It interesting to develop fibril ion exchange resin for purification of biodiesel
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Motivation for Research } Growing environmental concern } Majority of commercial resins are in
microporous beads (granular) form. } Diffusion (mass transfer) limitation. } Long regeneration process.
New materials with high selectivity, stability and cost effectiveness are needed. • Fibrous functional polymeric materials provide a solution to overcome
conventional resins limitations. • Grafting of gylcidylmethacrylate onto polyethylene non-woven fabric
provides potential alternative fibrous adsorbents for heavy metal removal.
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Single route to prepare polymer catalyst and ionic resin by radiation grafted absorbent
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New solid basic polymer catalyst
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MorphologyofnewfibrousbasicpolymerCatalyst
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Transesterification of triacetin ( model compound for triglycride)
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Effectofreac<onparametersontriace<nconversiontobiodieselinpresenceofmethanolusingnewcatalyst
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Reusability of catalyst(No of cycles)
Reaction temperature = 60°C, reaction time = 14h, molar ratio triacetin/methanol = 1:12
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Radiation grafted amine containing resin for purification of crude biodiesel
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Purification of crude biodiesel
Sample Soap (ppm) K (mg/kg) Water (mg/kg) Methanol (%)
Crude biodiesel
1678 25 1300 2.5
Resin treated biodiesel
160 1.5 700 0.4
Note:crudebiodieselwasobtainbytransesterifica6onofpalmoilwithKOHinpresenceofmethanol.
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ConcludingRemarks• Radiation induced grafting (RIG) is an advantageous technique for
preparation of basic polymer catalyst for biodiesel production and fibrous adsorbent for purification of crude biodiesel .
• PP/PE nonwoven fabric and GMA provide an excellent combination for preparation of precursors that can be aminated and used as adsorbent in a post grafting aminated and alkalized with KOH to be sued as catalyst for biodiesel production.
• Fibrous aminated and alkalized polymer is a promising heterogeneous solid polymer basic catalyst for biodiesel production.
• The polymer catalyst can be regenerated easily by washing with methanol and KOH
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Con<nue..• Theresultsofthisstudyrevealsthat:• Catalystobtainedhasastrongpoten<alforbiodieseland• Catalystcanberecoveredandregeneratedeasily• Theadsorbentcanbeeffec<velypurifycrudebiodiesel• Theuseofradia<ongraCedcatalystandadsorbentprovideacombina<onforminganewstrategytoimprovetheenvironmentalimpactofbiodieselproduc<on.
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Acknowledgments • Theauthorwishestothank:
• TheMalaysianMinistryofHigherEduca<on(MOHE)forawardingthisresearchgrantunderResearchUniversity(RU)Fund
• MalaysianNuclearAgencyforaccesstoirradia<onfacili<es
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