US20080127550A1 - Stabilized biodiesel fuel compositions - Google Patents
Stabilized biodiesel fuel compositions Download PDFInfo
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- US20080127550A1 US20080127550A1 US11/986,730 US98673007A US2008127550A1 US 20080127550 A1 US20080127550 A1 US 20080127550A1 US 98673007 A US98673007 A US 98673007A US 2008127550 A1 US2008127550 A1 US 2008127550A1
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- Prior art keywords
- triazole
- methyl
- benzotriazole
- tert
- tolyltriazole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 0 C1=NC=NN1.[1*]N([2*])CC Chemical compound C1=NC=NN1.[1*]N([2*])CC 0.000 description 6
- DPVRAKPVTIJJKP-UHFFFAOYSA-N C1=NC=NN1.CCC Chemical compound C1=NC=NN1.CCC DPVRAKPVTIJJKP-UHFFFAOYSA-N 0.000 description 4
- NGMBCURVWINBGF-UHFFFAOYSA-N CC.CCCCCCC(OC1CCCCC1)N1N=NC2=CC=CC=C21 Chemical compound CC.CCCCCCC(OC1CCCCC1)N1N=NC2=CC=CC=C21 NGMBCURVWINBGF-UHFFFAOYSA-N 0.000 description 1
- WTQMTLBLKARMEB-UHFFFAOYSA-N CC.COC(C)(C)N1N=NC2=CC=CC=C21 Chemical compound CC.COC(C)(C)N1N=NC2=CC=CC=C21 WTQMTLBLKARMEB-UHFFFAOYSA-N 0.000 description 1
- ZFWJVKLPEZPKNL-UHFFFAOYSA-N CCCc1n[nH]cn1 Chemical compound CCCc1n[nH]cn1 ZFWJVKLPEZPKNL-UHFFFAOYSA-N 0.000 description 1
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10L1/00—Liquid carbonaceous fuels
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- C10L1/00—Liquid carbonaceous fuels
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- C10L1/00—Liquid carbonaceous fuels
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- C10L1/232—Organic compounds containing nitrogen containing nitrogen in a heterocyclic ring
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- C10L10/00—Use of additives to fuels or fires for particular purposes
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- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10L1/183—Organic compounds containing oxygen containing hydroxy groups; Salts thereof at least one hydroxy group bound to an aromatic carbon atom
- C10L1/1835—Organic compounds containing oxygen containing hydroxy groups; Salts thereof at least one hydroxy group bound to an aromatic carbon atom having at least two hydroxy substituted non condensed benzene rings
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- C10L1/18—Organic compounds containing oxygen
- C10L1/185—Ethers; Acetals; Ketals; Aldehydes; Ketones
- C10L1/1852—Ethers; Acetals; Ketals; Orthoesters
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- C10L1/22—Organic compounds containing nitrogen
- C10L1/222—Organic compounds containing nitrogen containing at least one carbon-to-nitrogen single bond
- C10L1/224—Amides; Imides carboxylic acid amides, imides
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- C10L1/2418—Organic compounds containing sulfur, selenium and/or tellurium mercaptans; hydrocarbon sulfides containing a carboxylic substituted; derivatives thereof, e.g. esters
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
Definitions
- the present invention is aimed at biodiesel fuel (or bio-fuel) compositions, stabilized against the deleterious effects of heat, light, oxygen and metals by an effective amount of a combination of one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and one or more compounds selected from the group consisting of the triazole metal deactivators.
- WO2004055141 teaches the stabilization of fats, oils and food.
- the stabilizers are selected from the group consisting of the 3-arylbenzofuranones, long chain N,N-dialkylhydroxylamines, substituted hydroxylamines, nitrones and amine oxides.
- EP1486555, EP1484387 and EP1484388 disclose a low corrosive fuel composition for use in a blue flame burner or an optimized yellow flame burner of a boiler.
- U.S. Pat. No. 4,701,273 is aimed at lubricants and discloses combinations of a benzotriazole metal deactivator and phenolic antioxidants.
- U.S. Pat. No. 6,410,490 teaches a composition comprising a hydrotreated oil or a hydrowaxed oil and a combination of a triazole metal deactivator, a phenolic antioxidant, an aromatic amine antioxidant, an alkyl phenoxy alkanoic acid and an N-acyl sarcosine derivative.
- Biodeisel fuel is of increasing importance as a renewable fuel source. It may for example be employed as a fuel itself, or may be used in combination with diesel fuel.
- biodiesel fuel compositions stabilized against the deleterious effects of heat, light, oxygen and metals, which compositions comprise
- Biodiesel fuels are a renewable resource and are of increasing importance.
- Biodiesel fuels typically comprise lower alkyl fatty acid esters, prepared for example by transesterifying triglycerides with lower alcohols, e.g. methanol or ethanol.
- a typical biodiesel fuel is the fatty acid methyl ester of rapeseed oil or of soy oil.
- Sources for biodiesel fuel include vegetable and animal sources. Recycled cooking oil may be a source of biodiesel fuel.
- Biodiesel fuel and its preparation is taught for example in U.S. Pat. Nos. 5,578,090, 5,713,965, 5,891,203, 6,015,440, 6,174,501 and 6,398,707, the contents of which are hereby incorporated by reference.
- Biodiesel fuel of the present invention for example comprises lower alkyl esters of a mixture of saturated and unsaturated straight chain fatty acids of from 12 to 22 carbon atoms, derived from vegetable or oleaginous seeds.
- lower alkyl ester means C 1 -C 5 esters, in particular methyl and ethyl esters.
- the mixture of methyl esters of the saturated, monounsaturated and polyunsaturated C 16 -C 22 fatty acids are what is typically known as “biodiesel” or “rapeseed methyl ester”.
- Biodiesel fuel according to the present invention is 100% lower alkyl fatty acid ester, or is a combination of a lower alkyl fatty acid ester with diesel fuel.
- the present biodiesel fuel is for example from about 2 to about 98 weight percent fatty acid ester and from about 98 to about 2 weight percent diesel fuel.
- the present biodiesel fuel is from about 10 to about 90 weight percent fatty acid ester and from about 90 to about 10 weight percent diesel fuel.
- the present biodiesel fuel is from about 25 to about 75 weight percent fatty acid ester and from about 75 to about 25 weight percent diesel fuel.
- the hindered phenolic antioxidants are for example
- Alkylated monophenols for example 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2-( ⁇ -methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, nonylphenols which are linear or branched in the side chains, for example, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6-(1-
- Alkylthiomethylphenols for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-dodecylthiomethyl-4-nonylphenol.
- Hydroquinones and alkylated hydroquinones for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl)adipate.
- 2,6-di-tert-butyl-4-methoxyphenol 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-
- Tocopherols for example ⁇ -tocopherol, ⁇ -tocopherol, ⁇ -tocopherol, ⁇ -tocopherol and mixtures thereof (Vitamin E).
- Hydroxylated thiodiphenyl ethers for example 2,2′-thiobis(6-tert-butyl-4-methylphenol), 2,2′-thiobis(4-octylphenol), 4,4′-thiobis(6-tert-butyl-3-methylphenol), 4,4′-thiobis(6-tert-butyl-2-methylphenol), 4,4′-thiobis-(3,6-di-sec-amylphenol), 4,4′-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide.
- 2,2′-thiobis(6-tert-butyl-4-methylphenol 2,2′-thiobis(4-octylphenol), 4,4′-thiobis(6-tert-butyl-3-methylphenol), 4,4′-thiobis(6-tert-butyl-2-methylphenol), 4,4′-thiobis-(3,6-di-sec-amylphenol), 4,4′-bis(2,6
- Alkylidenebisphenols for example 2, 2′-methylenebis(6-tert-butyl-4-methylphenol), 2,2′-methylenebis(6-tert-butyl-4-ethylphenol), 2,2′-methylenebis[4-methyl-6-( ⁇ -methylcyclohexyl)phenol], 2,2′-methylenebis(4-methyl-6-cyclohexylphenol), 2,2′-methylenebis(6-nonyl-4-methylphenol), 2,2′-methylenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2′-methylenebis[6- ⁇ -methylbenzyl)-4-nonylphenol], 2,2′-methylenebis[6-( ⁇ , ⁇ -dimethylbenzyl)-4-nonylphenol], 2,
- Benzyl compounds for example 3, 5,3′,5′-tetra-tert-butyl-4,4′-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, tris(3,5-di-tert-butyl-4-hydroxybenzyl)amine, 1,3,5-tri-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, di-(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, 3,5-di-tert-butyl-4-hydroxybenzyl-mercapto-acetic acid isooctyl ester, bis-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithio
- Hydroxybenzylated malonates for example dioctadecyl-2,2-bis-(3,5-di-tert-butyl-2-hydroxybenzyl)-malonate, di-octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)-malonate, di-dodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, bis[4-(1,1,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.
- Aromatic hydroxybenzyl compounds for example 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 1,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6-tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol.
- Triazine compounds for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,3,5-triazine, 2,4,6-tris-(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,2,3-triazine, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 2,4,6-tris
- Benzylphosphonates for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy-3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid.
- Acylaminophenols for example 4-hydroxy-lauric acid anilide, 4-hydroxy-stearic acid anilide, 2,4-bis-octylmercapto-6-(3,5-tert-butyl-4-hydroxyanilino)-s-triazine and octyl-N-(3,5-di-tert-butyl-4-hydroxyphenyl)-carbamate.
- esters of ⁇ -(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[
- esters of ⁇ -(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis-(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[
- esters of ⁇ -(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
- esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
- the present hindered phenolic compounds are selected from butylated phenol, butylated hydroxytoluene, butylated hydroxyanisole, tocopherol, benzylphosphonates, esters of ⁇ -(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, esters of ⁇ -(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, esters of ⁇ -(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols and esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols.
- the present hindered phenolic compounds are selected from 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol (BHT), 2,2′-methylene bis-(4,6-di-tert-butylphenol), 1,6-hexamethylene-bis-(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), ((3,5-bis(1,1-dimethylethyl)-4-hydroxphenyl)methylthio)acetic acid C 10 -C 14 isoalkyl esters, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid C 6 -C 9 alkyl esters, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester, tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane
- the present hindered phenolic antioxidants are selected from 2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester and tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane.
- the present triazole metal deactivators are of the 1,2,4-triazole class or the benzotriazole class.
- Metal deactivators of the 1,2,4-triazole class are disclosed for example in U.S. Pat. No. 4,734,209, the disclosure of which is hereby incorporated by reference.
- the 1,2,4-triazole metal deactivators are for example of the formula (I)
- R 1 and R 2 are the same or different and are hydrogen, C 1 -C 20 alkyl, C 3 -C 20 alkenyl, C 5 -C 12 cycloalkyl, C 7 -C 13 aralkyl, C 6 -C 10 aryl or hydroxy or R 1 and R 2 , together with the nitrogen atom to which they are each attached may form a 5-, 6- or 7-membered heterocylic ring, or R 1 and R 2 are a group of formula
- X is O, S or NR 3 ,
- R 3 is hydrogen or C 1 -C 20 alkyl
- R 4 is C 1 -C 12 alkylene
- n 0 or an integer from 1 to 6
- R 1 and R 2 are a group of formula
- R 2 is a group of formula (II) and R 1 is a group of formula
- n 0 or 1 and, when m is zero, A is a group of formula (II) and, when m is 1, A is alkylene or C 6 -C 10 arylene and R 5 is a group of formula (II).
- R 4 is for example a C 1 -C 6 alkylene group, for instance a C 2 -C 3 alkylene.
- n is for instance 0, 1, 2, 3, 4, 5 or 6.
- the present compound of formula (I) is for example 1-(di-isooctylaminomethyl)triazole, that is 1-(di-isooctylaminomethyl)-1,2,4-triazole, or is 1-(di-(2-ethylhexyl)aminomethyl)1,2,4-triazole.
- benzotriazole metal deactivators are for example those disclosed in U.S. Pat. Nos. 5,032,300 and 5,171,463, the disclosures of which are hereby incorporated by reference.
- the benzotriazole metal deactivators are for example of the formula (III)
- R 6 is C 1 -C 12 alkyl
- R 7 is C 1 -C 12 alkyl, C 1 -C 12 alkyl interrupted by one or more O atoms or is C 5 -C 12 cycloalkyl and
- R 8 and R 9 are hydrogen or methyl.
- the present compound of formula (III) is for example 1-(2-methoxyprop-2-yl)tolyltriazole, 1-(1-cyclohexyloxypropyl)tolyltriazole, 1-(1-cyclohexyloxyheptyl)tolyltriazole or 1-(1-cyclohexyloxybutyl)tolyltriazole.
- benzotriazole metal deactivators may also be for example those disclosed in U.S. Pat. Nos. 5,580,482 and 6,410,490, the disclosures of which are hereby incorporated by reference.
- the benzotriazole metal deactivators are for example of the formula (IV)
- R 10 is hydrogen or C 1 -C 12 alkyl
- R 11 and R 12 are the same or different and are hydrogen, C 1 -C 20 alkyl, C 3 -C 20 alkenyl, C 5 -C 12 cycloalkyl, C 7 -C 13 aralkyl, C 6 -C 10 aryl or hydroxy or R 11 and R 12 , together with the nitrogen atom to which they are each attached may form a 5-, 6- or 7-membered heterocylic ring, or R 11 and R 12 are a group of formula
- X is O, S or NR 13 ,
- R 13 is hydrogen or C 1 -C 20 alkyl
- R 14 is C 1 -C 12 alkylene
- n 0 or an integer from 1 to 6
- R 11 and R 12 is a group of formula
- R 12 is a group of formula (II) and R 11 is a group of formula
- n 0 or 1 and, when m is zero, A is a group of formula (II) and, when m is 1, A is alkylene or C 6 -C 10 arylene and R 15 is a group of formula (II).
- the benzotriazoles of component (IV) are for example
- the present benzotriazoles of formula (IV) are for example 4-(or 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole or 4-(or 5)-methyl-1-(di-isooctylaminomethyl)-benzotriazole.
- Alkyl is a branched or unbranched radical such as, for example, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2-ethylbutyl, n-pentyl, isopentyl, 1-methylpentyl, 1,3-dimethylbutyl, n-hexyl, 1-methylhexyl, n-heptyl, isoheptyl, 1,1,3,3-tetramethylbutyl, 1-methylheptyl, 3-methylheptyl, n-octyl, 2-ethylhexyl, 1,1,3-trimethylhexyl, 1,1,3,3-tetramethylpentyl, nonyl, decyl, undecyl, 1-methylundecyl, dodecyl, 1,1,3,3,5,5-hexamethylhexyl, tridec
- Alkenyl is a branched or unbranched radical such as, for example, propenyl, 2-butenyl, 3-butenyl, isobutenyl, n-2,4-pentadienyl, 3-methyl-2-butenyl, n-2-octenyl, n-2-dodecenyl, isododecenyl, oleyl, n-2-octadecenyl or n-4-octadecenyl.
- Preference is given to alkenyl having 3 to 18, especially 3 to 12, for example 3 to 6, in particular 3 to 4 carbon atoms.
- Cycloalkyl is, for example, cyclopentyl, methylcyclopentyl, dimethylcyclopentyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, trimethylcyclohexyl, tert-butylcyclohexyl, cycloheptyl or cyclooctyl. Preference is given to cyclohexyl and tert-butylcyclohexyl.
- Aralkyl is, for example, benzyl, ⁇ -methylbenzyl, ⁇ , ⁇ -dimethylbenzyl or 2-phenylethyl. Benzyl and ⁇ , ⁇ -dimethylbenzyl are preferred.
- Aryl is for example phenyl or naphthyl, but also comprised are C 1 -C 4 alkyl substituted phenyl, C 1 -C 4 alkoxy substituted phenyl, hydroxy, halogen or nitro substituted phenyl.
- alkyl substituted phenyl are ethylbenzene, toluene, xylene and its isomers, mesitylene or isopropylbenzene.
- Halogen substituted phenyl is for example dichlorobenzene or bromotoluene.
- Alkylene is a branched or unbranched radical such as, for example, methylene, ethyllene, propylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethyllene, octamethylene, decamethylene, dodecamethylene or octadecamethylene. Preference is given to C 1 -C 8 alkylene.
- Arylene is a divalent aryl, for instance phenylene or naphthalene.
- Components i) and ii) each are employed at levels of about 5 ppm to about 5000 ppm, for example from about 50 ppm to about 5000 ppm, for example from about 100 to about 5000 ppm by weight, based on the weight of the biodiesel fuel.
- each of the present additives are present from about 150 to about 4000 ppm, from about 200 to about 3000 ppm, or from about 250 to about 2500 ppm by weight, based on the weight of the biodiesel fuel.
- the levels may be as high as about 1%, about 2% or about 3% by weight, based on the weight of the biodiesel fuel.
- the present stabilized biodiesel fuels exhibit increased storage stability vs. unstabilized samples.
- Degradation of biodiesel fuels under the conditions of heat, light, oxygen or metals is observed by the formation of carboxylic acids, peroxides, aldehydes and alcohols.
- Degradation under the conditions of metals means metal contamination.
- the present stabilized biodiesel fuels may also contain known metal chelating compounds.
- the known metal chelating compounds include hydroxycarboxylic acid chelators such as citric acid, hydroxycarboxylic acid ester chelators such as triethyl citrate and monostearyl citrate, Schiff bases such as N,N,-disalicylidene-1,2-propanediamine (DMD), aminoalcohols such as triethanolamine and N-hydroxyethylethylenediamine, polyamines such as ethylenediamine and diethylenetriamine and aminocarboxylic acid chelators such as ethylenediaminetetraacetic acid (EDTA). Mixtures of these compounds may also be employed.
- hydroxycarboxylic acid chelators such as citric acid, hydroxycarboxylic acid ester chelators such as triethyl citrate and monostearyl citrate, Schiff bases such as N,N,-disalicylidene-1,2-propanediamine (DMD), aminoalco
- the present stabilized biodiesel fuels may also contain one or more stabilizers selected from the group consisting of the 3-arylbenzofuranone stabilizers and the hindered amine light stabilizers.
- stabilizers as disclosed in U.S. provisional app. No. 60/756,090, filed Jan. 4, 2006, the disclosure of which is hereby incorporated by reference.
- the 3-arylbenzofuranones antioxidants are for example those disclosed in U.S. Pat. Nos. 4,325,863; U.S. Pat. No. 4,388,244; U.S. Pat. No. 5,175,312; U.S. Pat. No. 5,252,643; U.S. Pat. No. 5,216,052; U.S. Pat. No. 5,369,159; U.S. Pat. No. 5,488,117; U.S. Pat. No. 5,356,966; U.S. Pat. No. 5,367,008; U.S. Pat. No. 5,428,162; U.S. Pat. No. 5,428,177; and U.S. Pat. No. 5,516,920; which are hereby incorporated by reference.
- benzofuranone type stabilizers which are particularly suitable include 3-[4-(2-acetoxyethoxy)phenyl]-5,7-di-tert-butyl-benzofuran-2-one; 5,7-di-tert-butyl-3-[4-(2-stearoyloxyethoxy)phenyl]benzofuran-2-one; 3,3′-bis[5,7-di-tert-butyl-3-(4-[2-hydroxyethoxy]-phenyl)benzofuran-2-one]; 5,7-di-tert-butyl-3-(4-ethoxyphenyl)benzofuran-2-one; 3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one; 3-(3,5-dimethyl-4-pivaloyloxy-phenyl)-5,7-di-tert-butyl-benzofuran-2-one;
- the hindered amines are disclosed for example in U.S. Pat. Nos. 5,004,770, 5,204,473, 5,096,950, 5,300,544, 5,112,890, 5,124,378, 5,145,893, 5,216,156, 5,844,026, 5,980,783, 6,046,304, 6,117,995, 6,271,377, 6,297,299, 6,392,041, 6,376,584 and 6,472,456, and U.S. application Ser. No. 09/714,717, filed Nov. 16, 2000 and 10/485,377, filed Aug. 6, 2002. The relevant disclosures of these patents and applications are hereby incorporated by reference.
- Suitable hindered amines include for example:
- N—H sterically hindered N—H, N-methyl, N-methoxy, N-propoxy, N-octyloxy, N-cyclohexyloxy, N-acyloxy and N-(2-hydroxy-2-methylpropoxy) analogues of any of the above mentioned compounds.
- N—H hindered amine replacing an N—H hindered amine with an N-methyl hindered amine would be employing the N-methyl analogue in place of the N—H.
- the benzofuranone and hindered amine stabilizers are employed at the same levels as present components i) and ii).
- the loss in stability of biodiesel may be observed by gum formation.
- the Rancimat test developed by the food industry, is employed to test the oxidative stability of soy biodiesel (methyl ester of soy fatty acid).
- soy biodiesel methyl ester of soy fatty acid.
- a 3.0 g sample of soy biodiesel is held at 111.7° C. and exposed to a bubbling stream of air (10 liters per hour).
- the sample vessel is vented to a secondary container, where the off-gases are bubbled through 50 mL of distilled water.
- the test measures the volatile oxidation decomposition products such as peroxides, alcohols, aldehydes and carboxylic acids.
- the volatile decomposition products (chiefly formic acid) are swept through the sample vessel and vented into the secondary container where they are trapped by the distilled water.
- the conductivity of the water is constantly monitored as a function of time through use of an electrode.
- the inflection point (not a specific value) of the conductivity curve is the measured induction time. It should be pointed out that some samples will be highly conductive before the inflection point is achieved, while others will only be slightly conductive. An increase of the induction time indicates an increase in oxidative stability. Results are in the tables below.
- Levels of additive are in weight percent based on the weight of the biodiesel.
- the present stabilizer combination of components i) and ii) provide for outstanding performance for the Rancimat test.
- a 6 hour induction time is necessary to meet the EN 14214 specification.
- the above experiment is repeated where the biodiesel is spiked with 5 ppm of copper.
- the first control formulation contains no copper.
- Soy biodiesel is stored outdoors from Aug. 3, 2006 until Oct. 13, 2006 in Tarrytown, N.Y.
- the Rancimat induction times are monitored as a function of time (weeks) and additive level.
- the containers are closed and opened once per week for sampling. The following results are observed.
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Abstract
Disclosed are stabilized biodiesel fuel compositions, which compositions comprise a biodiesel fuel, for example the methyl esters of the fatty acids of rapeseed or soy oil, which compositions comprise
- a biodiesel fuel and
- an effective stabilizing amount of a combination of
- i) one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and
- ii) one or more compounds selected from the group consisting of the triazole metal deactivators.
Description
- This application claims benefit of U.S. provisional application No. 60/861,194, filed Nov. 27, 2006, which is incorporated by reference.
- The present invention is aimed at biodiesel fuel (or bio-fuel) compositions, stabilized against the deleterious effects of heat, light, oxygen and metals by an effective amount of a combination of one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and one or more compounds selected from the group consisting of the triazole metal deactivators.
- WO2004055141 teaches the stabilization of fats, oils and food. The stabilizers are selected from the group consisting of the 3-arylbenzofuranones, long chain N,N-dialkylhydroxylamines, substituted hydroxylamines, nitrones and amine oxides.
- EP1486555, EP1484387 and EP1484388 disclose a low corrosive fuel composition for use in a blue flame burner or an optimized yellow flame burner of a boiler.
- U.S. Pat. No. 4,701,273 is aimed at lubricants and discloses combinations of a benzotriazole metal deactivator and phenolic antioxidants.
- U.S. Pat. No. 6,410,490 teaches a composition comprising a hydrotreated oil or a hydrowaxed oil and a combination of a triazole metal deactivator, a phenolic antioxidant, an aromatic amine antioxidant, an alkyl phenoxy alkanoic acid and an N-acyl sarcosine derivative.
- U.S. publication No. 2006/0218855 is aimed at a method of increasing the oxidation stability of biodiesel.
- Biodeisel fuel is of increasing importance as a renewable fuel source. It may for example be employed as a fuel itself, or may be used in combination with diesel fuel.
- Disclosed are biodiesel fuel compositions stabilized against the deleterious effects of heat, light, oxygen and metals, which compositions comprise
- a biodiesel fuel and
- an effective stabilizing amount of a combination of
- i) one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and
- ii) one or more compounds selected from the group consisting of the triazole metal deactivators.
- Also disclosed is a process for the stabilization of a biodiesel fuel against the deleterious effects of heat, light, oxygen and metals, which process comprises
- incorporating into a biodiesel fuel
- an effective stabilizing amount of a combination of
- i) one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and
- ii) one or more compounds selected from the group consisting of the triazole metal deactivators.
- Biodiesel fuels are a renewable resource and are of increasing importance.
- Biodiesel fuels typically comprise lower alkyl fatty acid esters, prepared for example by transesterifying triglycerides with lower alcohols, e.g. methanol or ethanol. A typical biodiesel fuel is the fatty acid methyl ester of rapeseed oil or of soy oil. Sources for biodiesel fuel include vegetable and animal sources. Recycled cooking oil may be a source of biodiesel fuel.
- Biodiesel fuel and its preparation is taught for example in U.S. Pat. Nos. 5,578,090, 5,713,965, 5,891,203, 6,015,440, 6,174,501 and 6,398,707, the contents of which are hereby incorporated by reference.
- Biodiesel fuel of the present invention for example comprises lower alkyl esters of a mixture of saturated and unsaturated straight chain fatty acids of from 12 to 22 carbon atoms, derived from vegetable or oleaginous seeds. The term “lower alkyl ester” means C1-C5 esters, in particular methyl and ethyl esters. The mixture of methyl esters of the saturated, monounsaturated and polyunsaturated C16-C22 fatty acids are what is typically known as “biodiesel” or “rapeseed methyl ester”.
- Biodiesel fuel according to the present invention is 100% lower alkyl fatty acid ester, or is a combination of a lower alkyl fatty acid ester with diesel fuel. The present biodiesel fuel is for example from about 2 to about 98 weight percent fatty acid ester and from about 98 to about 2 weight percent diesel fuel. For example, the present biodiesel fuel is from about 10 to about 90 weight percent fatty acid ester and from about 90 to about 10 weight percent diesel fuel. For instance, the present biodiesel fuel is from about 25 to about 75 weight percent fatty acid ester and from about 75 to about 25 weight percent diesel fuel.
- The hindered phenolic antioxidants are for example
- 1.1. Alkylated monophenols, for example 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2-(α-methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, nonylphenols which are linear or branched in the side chains, for example, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6-(1-methylundec-1-yl)phenol, 2,4-dimethyl-6-(1-methylheptadec-1-yl)phenol, 2,4-dimethyl-6-(1-methyltridec-1-yl)phenol and mixtures thereof.
- 1.2. Alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-dodecylthiomethyl-4-nonylphenol.
- 1.3. Hydroquinones and alkylated hydroquinones, for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl)adipate.
- 1.4. Tocopherols, for example α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol and mixtures thereof (Vitamin E).
- 1.5. Hydroxylated thiodiphenyl ethers, for example 2,2′-thiobis(6-tert-butyl-4-methylphenol), 2,2′-thiobis(4-octylphenol), 4,4′-thiobis(6-tert-butyl-3-methylphenol), 4,4′-thiobis(6-tert-butyl-2-methylphenol), 4,4′-thiobis-(3,6-di-sec-amylphenol), 4,4′-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide.
- 1.6. Alkylidenebisphenols, for example 2, 2′-methylenebis(6-tert-butyl-4-methylphenol), 2,2′-methylenebis(6-tert-butyl-4-ethylphenol), 2,2′-methylenebis[4-methyl-6-(α-methylcyclohexyl)phenol], 2,2′-methylenebis(4-methyl-6-cyclohexylphenol), 2,2′-methylenebis(6-nonyl-4-methylphenol), 2,2′-methylenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2′-methylenebis[6-α-methylbenzyl)-4-nonylphenol], 2,2′-methylenebis[6-(α,α-dimethylbenzyl)-4-nonylphenol], 4,4′-methylenebis(2,6-di-tert-butylphenol), 4,4′-methylenebis(6-tert-butyl-2-methylphenol), 1,1-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 1,1-bis(5-tert-butyl-4-hydroxy-2-methyl-phenyl)-3-n-dodecylmercaptobutane, ethylene glycol bis[3,3-bis(3-tert-butyl-4-hydroxyphenyl)butyrate], bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopentadiene, bis[2-(3′tert-butyl-2-hydroxy-5-methylbenzyl)-6-tert-butyl-4-methylphenyl]terephthalate, 1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)butane, 2,2-bis-(3,5-di-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis-(5-tert-butyl-4-hydroxy-2-methylphenyl)-4-n-dodecylmercaptobutane, 1,1,5,5-tetra-(5-tert-butyl-4-hydroxy-2-methylphenyl)pentane.
- 1.7. Benzyl compounds, for example 3, 5,3′,5′-tetra-tert-butyl-4,4′-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, tris(3,5-di-tert-butyl-4-hydroxybenzyl)amine, 1,3,5-tri-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, di-(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, 3,5-di-tert-butyl-4-hydroxybenzyl-mercapto-acetic acid isooctyl ester, bis-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithiol terephthalate, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 3,5-di-tert-butyl-4-hydroxybenzyl-phosphoric acid dioctadecyl ester and 3,5-di-tert-butyl-4-hydroxybenzyl-phosphoric acid monoethyl ester, calcium-salt.
- 1.8. Hydroxybenzylated malonates, for example dioctadecyl-2,2-bis-(3,5-di-tert-butyl-2-hydroxybenzyl)-malonate, di-octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)-malonate, di-dodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, bis[4-(1,1,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.
- 1.9. Aromatic hydroxybenzyl compounds, for example 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 1,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6-tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol.
- 1.10. Triazine compounds, for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,3,5-triazine, 2,4,6-tris-(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,2,3-triazine, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenylethyl)-1,3,5-triazine, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-hexahydro-1,3,5-triazine, 1,3,5-tris(3,5-dicyclohexyl-4-hydroxybenzyl)isocyanurate.
- 1.11. Benzylphosphonates, for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy-3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid.
- 1.12. Acylaminophenols, for example 4-hydroxy-lauric acid anilide, 4-hydroxy-stearic acid anilide, 2,4-bis-octylmercapto-6-(3,5-tert-butyl-4-hydroxyanilino)-s-triazine and octyl-N-(3,5-di-tert-butyl-4-hydroxyphenyl)-carbamate.
- 1.13. Esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
- 1.14. Esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis-(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
- 1.15. Esters of β-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
- 1.16. Esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
- 1.17. Amides of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid e.g. N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamide, N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)trimethylenediamide, N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazide, N,N′-bis[2-(3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionyloxy)ethyl]oxamide (Naugard®XL-1 supplied by Uniroyal).
- For example, the present hindered phenolic compounds are selected from butylated phenol, butylated hydroxytoluene, butylated hydroxyanisole, tocopherol, benzylphosphonates, esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, esters of β-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols and esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols.
- For instance, the present hindered phenolic compounds are selected from 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol (BHT), 2,2′-methylene bis-(4,6-di-tert-butylphenol), 1,6-hexamethylene-bis-(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), ((3,5-bis(1,1-dimethylethyl)-4-hydroxphenyl)methylthio)acetic acid C10-C14 isoalkyl esters, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid C6-C9alkyl esters, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester, tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane, thiodiethylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate and 2,5-di-tert-butylhydroquinone.
- For example, the present hindered phenolic antioxidants are selected from 2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester and tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane.
- The present triazole metal deactivators are of the 1,2,4-triazole class or the benzotriazole class.
- Metal deactivators of the 1,2,4-triazole class are disclosed for example in U.S. Pat. No. 4,734,209, the disclosure of which is hereby incorporated by reference.
- The 1,2,4-triazole metal deactivators are for example of the formula (I)
- where
- R1 and R2 are the same or different and are hydrogen, C1-C20alkyl, C3-C20alkenyl, C5-C12cycloalkyl, C7-C13aralkyl, C6-C10aryl or hydroxy or R1 and R2, together with the nitrogen atom to which they are each attached may form a 5-, 6- or 7-membered heterocylic ring, or R1 and R2 are a group of formula
-
R3X[(—R4—)O]n(—R4)— - where
- X is O, S or NR3,
- R3 is hydrogen or C1-C20alkyl,
- R4 is C1-C12alkylene,
- n is 0 or an integer from 1 to 6,
- or one of R1 and R2 is a group of formula
- or R2 is a group of formula (II) and R1 is a group of formula
-
—[R4]n—N(R5)-A-[N(R5)2]m - where
- m is 0 or 1 and, when m is zero, A is a group of formula (II) and, when m is 1, A is alkylene or C6-C10 arylene and R5 is a group of formula (II).
- R4 is for example a C1-C6alkylene group, for instance a C2-C3alkylene.
- n is for instance 0, 1, 2, 3, 4, 5 or 6.
- Specific compounds of present formula (I) include:
- 1-(or 4)-(dimethylaminomethyl)triazole,
- 1-(or 4)-(diethylaminomethyl)triazole,
- 1-(or 4)-(di-isopropylaminomethyl)triazole,
- 1-(or 4)-(di-n-butylaminomethyl)triazole,
- 1-(or 4)-(di-n-hexylaminomethyl)triazole,
- 1-(or 4)-(di-isooctylaminomethyl)triazole,
- 1-(or 4)-(di-(2-ethylhexyl)aminomethyl)triazole,
- 1-(or 4)-(di-n-octylaminomethyl)triazole,
- 1-(or 4)-(di-n-decylaminomethyl)triazole,
- 1-(or 4)-(di-n-dodecylaminomethyl)triazole,
- 1-(or 4)-(di-n-octadecylaminomethyl)triazole,
- 1-(or 4)-(di-n-eicosylaminomethyl)triazole,
- 1-(or 4)-[di-(prop-2′-enyl)aminomethyl]triazole,
- 1-(or 4)-[di-(but-2′-enyl)aminomethyl]triazole,
- 1-(or 4)-[di-(eicos-2′-enyl)aminomethyl]triazole,
- 1-(or 4)-(di-cyclohexylaminomethyl)triazole,
- 1-(or 4)-(di-benzylaminomethyl)triazole,
- 1-(or 4)-(di-phenylaminomethyl)triazole,
- 1-(or 4)-(4′-morpholinomethyl)triazole,
- 1-(or 4)-(1′-pyrrolidinomethyl)triazole,
- 1-(or 4)-(1′-piperidinomethyl)triazole,
- 1-(or 4)-(1′-perhydroroazepinomethyl)triazole,
- 1-(or 4)-(2′,2″-dihydroxyethyl)aminomethyl]triazole,
- 1-(or 4)-(dibutoxypropyl-aminomethyl)triazole,
- 1-(or 4)-(dibutylthiopropyl-aminomethyl)triazole,
- 1-(or 4)-(di-butylaminopropyl-aminomethyl)triazole,
- N,N-bis-(1- or 4-triazolylmethyl)laurylamine,
- N,N-bis-(1- or 4-triazolylmethyl)oleylamine,
- N,N-bis-(1- or 4-triazolylmethyl)ethanolamine and
- N,N,N′,N′-tetra(1- or 4-triazolylmethyl)ethylene diamine.
- The present compound of formula (I) is for example 1-(di-isooctylaminomethyl)triazole, that is 1-(di-isooctylaminomethyl)-1,2,4-triazole, or is 1-(di-(2-ethylhexyl)aminomethyl)1,2,4-triazole.
- The benzotriazole metal deactivators are for example those disclosed in U.S. Pat. Nos. 5,032,300 and 5,171,463, the disclosures of which are hereby incorporated by reference.
- The benzotriazole metal deactivators are for example of the formula (III)
- where
- R6 is C1-C12alkyl,
- R7 is C1-C12alkyl, C1-C12alkyl interrupted by one or more O atoms or is C5-C12cycloalkyl and
- R8 and R9 are hydrogen or methyl.
- Specific examples of compounds of formula (III) include:
- 1-(2-methoxyprop-2-yl)tolyltriazole,
- 1-(1-methoxyethyl)tolyltriazole,
- 1-(1-methoxpropyl)tolyltriazole,
- 1-(1-isobutoxybutyl)tolyltriazole,
- 1-(1-tert-butoxybutyl)tolyltriazole,
- 1-(1-hexyloxybutyl)tolyltriazole,
- 1-(1-octyloxybutyl)tolyltriazole,
- 1-(1-butoxy-2-methylpropyl)tolyltriazole,
- 1-(1-dodecyloxybutyl)tolyltriazole,
- 1-(1-isopropyloxyethyl)tolyltriazole,
- 1-(1-isopropyloxypropyl)tolyltriazole,
- 1-(1-isopropyloxybutyl)tolyltriazole,
- 1-(1-cyclohexyloxypropyl)tolyltriazole,
- 1-(1-cyclohexyloxyheptyl)tolyltriazole,
- 1-(1-cyclohexyloxybutyl)tolyltriazole,
- 1-[1-(2-methoxyethoxy)butyl]tolyltriazole and
- 1-[1-(2-ethoxyethoxy)butyl]tolyltriazole.
- The present compound of formula (III) is for example 1-(2-methoxyprop-2-yl)tolyltriazole, 1-(1-cyclohexyloxypropyl)tolyltriazole, 1-(1-cyclohexyloxyheptyl)tolyltriazole or 1-(1-cyclohexyloxybutyl)tolyltriazole.
- (1-(2-methoxyprop-2-yl)tolyltriazole is
- 1-(1-cyclohexyloxyheptyl)tolyltriazole is
- The benzotriazole metal deactivators may also be for example those disclosed in U.S. Pat. Nos. 5,580,482 and 6,410,490, the disclosures of which are hereby incorporated by reference.
- The benzotriazole metal deactivators are for example of the formula (IV)
- where
- R10 is hydrogen or C1-C12alkyl,
- R11 and R12 are the same or different and are hydrogen, C1-C20alkyl, C3-C20alkenyl, C5-C12cycloalkyl, C7-C13aralkyl, C6-C10aryl or hydroxy or R11 and R12, together with the nitrogen atom to which they are each attached may form a 5-, 6- or 7-membered heterocylic ring, or R11 and R12 are a group of formula
-
R13X[(—R14—)O]n(—R14)— - where
- X is O, S or NR13,
- R13 is hydrogen or C1-C20alkyl,
- R14 is C1-C12alkylene,
- n is 0 or an integer from 1 to 6,
- or one of R11 and R12 is a group of formula
- or R12 is a group of formula (II) and R11 is a group of formula
-
—[R14]n—N(R15)-A-[N(R15)2]m - where
- m is 0 or 1 and, when m is zero, A is a group of formula (II) and, when m is 1, A is alkylene or C6-C10arylene and R15 is a group of formula (II).
- The benzotriazoles of component (IV) are for example
- 4-(or 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(dimethylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(diethylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-isopropylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-butylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-hexylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-isooctylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-octylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-decylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-dodecylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-octadecylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-n-eicosylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-[di-(prop-2′-enyl)aminomethyl]-benzotriazole,
- 4-(or 5)-methyl-1-[di-(but-2′-enyl)aminomethyl]-benzotriazole,
- 4-(or 5)-methyl-1-[di-(eicos-2′-enyl)aminomethyl]-benzotriazole,
- 4-(or 5)-methyl-1-(di-cyclohexylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-benzylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(di-phenylaminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(4′-morpholinomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(1′-pyrrolidinomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(1′-piperidinomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(1′-perhydroroazepinomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(2′,2″-dihydroxyethyl)aminomethyl]-benzotriazole,
- 4-(or 5)-methyl-1-(dibutoxypropyl-aminomethyl)-benzotriazole,
- 4-(or 5)-methyl-1-(dibutylthiopropyl-aminomethyl)-benzotriazole and
- 4-(or 5)-methyl-1-(di-butylaminopropyl-aminomethyl)-benzotriazole.
- The present benzotriazoles of formula (IV) are for example 4-(or 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole or 4-(or 5)-methyl-1-(di-isooctylaminomethyl)-benzotriazole.
- Alkyl is a branched or unbranched radical such as, for example, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2-ethylbutyl, n-pentyl, isopentyl, 1-methylpentyl, 1,3-dimethylbutyl, n-hexyl, 1-methylhexyl, n-heptyl, isoheptyl, 1,1,3,3-tetramethylbutyl, 1-methylheptyl, 3-methylheptyl, n-octyl, 2-ethylhexyl, 1,1,3-trimethylhexyl, 1,1,3,3-tetramethylpentyl, nonyl, decyl, undecyl, 1-methylundecyl, dodecyl, 1,1,3,3,5,5-hexamethylhexyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, eicosyl or docosyl.
- Alkenyl is a branched or unbranched radical such as, for example, propenyl, 2-butenyl, 3-butenyl, isobutenyl, n-2,4-pentadienyl, 3-methyl-2-butenyl, n-2-octenyl, n-2-dodecenyl, isododecenyl, oleyl, n-2-octadecenyl or n-4-octadecenyl. Preference is given to alkenyl having 3 to 18, especially 3 to 12, for example 3 to 6, in particular 3 to 4 carbon atoms.
- Cycloalkyl is, for example, cyclopentyl, methylcyclopentyl, dimethylcyclopentyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, trimethylcyclohexyl, tert-butylcyclohexyl, cycloheptyl or cyclooctyl. Preference is given to cyclohexyl and tert-butylcyclohexyl.
- Aralkyl is, for example, benzyl, α-methylbenzyl, α,α-dimethylbenzyl or 2-phenylethyl. Benzyl and α,α-dimethylbenzyl are preferred.
- Aryl is for example phenyl or naphthyl, but also comprised are C1-C4alkyl substituted phenyl, C1-C4alkoxy substituted phenyl, hydroxy, halogen or nitro substituted phenyl. Examples for alkyl substituted phenyl are ethylbenzene, toluene, xylene and its isomers, mesitylene or isopropylbenzene. Halogen substituted phenyl is for example dichlorobenzene or bromotoluene.
- Alkylene is a branched or unbranched radical such as, for example, methylene, ethyllene, propylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethyllene, octamethylene, decamethylene, dodecamethylene or octadecamethylene. Preference is given to C1-C8alkylene.
- Arylene is a divalent aryl, for instance phenylene or naphthalene.
- Components i) and ii) each are employed at levels of about 5 ppm to about 5000 ppm, for example from about 50 ppm to about 5000 ppm, for example from about 100 to about 5000 ppm by weight, based on the weight of the biodiesel fuel. For example, each of the present additives are present from about 150 to about 4000 ppm, from about 200 to about 3000 ppm, or from about 250 to about 2500 ppm by weight, based on the weight of the biodiesel fuel. In certain instances, the levels may be as high as about 1%, about 2% or about 3% by weight, based on the weight of the biodiesel fuel.
- The present stabilized biodiesel fuels exhibit increased storage stability vs. unstabilized samples. Degradation of biodiesel fuels under the conditions of heat, light, oxygen or metals is observed by the formation of carboxylic acids, peroxides, aldehydes and alcohols. Degradation under the conditions of metals means metal contamination.
- The present stabilized biodiesel fuels may also contain known metal chelating compounds. The known metal chelating compounds include hydroxycarboxylic acid chelators such as citric acid, hydroxycarboxylic acid ester chelators such as triethyl citrate and monostearyl citrate, Schiff bases such as N,N,-disalicylidene-1,2-propanediamine (DMD), aminoalcohols such as triethanolamine and N-hydroxyethylethylenediamine, polyamines such as ethylenediamine and diethylenetriamine and aminocarboxylic acid chelators such as ethylenediaminetetraacetic acid (EDTA). Mixtures of these compounds may also be employed.
- The present stabilized biodiesel fuels may also contain one or more stabilizers selected from the group consisting of the 3-arylbenzofuranone stabilizers and the hindered amine light stabilizers. For instance, stabilizers as disclosed in U.S. provisional app. No. 60/756,090, filed Jan. 4, 2006, the disclosure of which is hereby incorporated by reference.
- The 3-arylbenzofuranones antioxidants are for example those disclosed in U.S. Pat. Nos. 4,325,863; U.S. Pat. No. 4,388,244; U.S. Pat. No. 5,175,312; U.S. Pat. No. 5,252,643; U.S. Pat. No. 5,216,052; U.S. Pat. No. 5,369,159; U.S. Pat. No. 5,488,117; U.S. Pat. No. 5,356,966; U.S. Pat. No. 5,367,008; U.S. Pat. No. 5,428,162; U.S. Pat. No. 5,428,177; and U.S. Pat. No. 5,516,920; which are hereby incorporated by reference.
- For instance, benzofuranone type stabilizers which are particularly suitable include 3-[4-(2-acetoxyethoxy)phenyl]-5,7-di-tert-butyl-benzofuran-2-one; 5,7-di-tert-butyl-3-[4-(2-stearoyloxyethoxy)phenyl]benzofuran-2-one; 3,3′-bis[5,7-di-tert-butyl-3-(4-[2-hydroxyethoxy]-phenyl)benzofuran-2-one]; 5,7-di-tert-butyl-3-(4-ethoxyphenyl)benzofuran-2-one; 3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one; 3-(3,5-dimethyl-4-pivaloyloxy-phenyl)-5,7-di-tert-butyl-benzofuran-2-one; 5,7-di-tert-butyl-3-phenylbenzofuran-2-one; 5,7-di-tert-butyl-3-(3,4-dimethylphenyl)-benzofuran-2-one; or 5,7-di-tert-butyl-3-(2,3-dimethylphenyl)benzofuran-2-one.
- The hindered amines are disclosed for example in U.S. Pat. Nos. 5,004,770, 5,204,473, 5,096,950, 5,300,544, 5,112,890, 5,124,378, 5,145,893, 5,216,156, 5,844,026, 5,980,783, 6,046,304, 6,117,995, 6,271,377, 6,297,299, 6,392,041, 6,376,584 and 6,472,456, and U.S. application Ser. No. 09/714,717, filed Nov. 16, 2000 and 10/485,377, filed Aug. 6, 2002. The relevant disclosures of these patents and applications are hereby incorporated by reference.
- Suitable hindered amines include for example:
- 1) 1-cyclohexyloxy-2,2,6,6-tetramethyl-4-octadecylaminopiperidine,
- 2) bis(2,2,6,6-tetramethylpiperidin-4-yl)sebacate,
- 3) bis(1-acetoxy-2,2,6,6-tetramethylpiperidin-4-yl)sebacate,
- 4) bis(1,2,2,6,6-pentamethyl-4-yl)sebacate,
- 5) bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)sebacate,
- 6) bis(1-octyloxy-2,2,6,6-tetramethylpiperidin-4-yl)sebacate;
- 7) bis(1-acyl-2,2,6,6-tetramethylpiperidin-4-yl)sebacate,
- 8) bis(1,2,2,6,6-pentamethyl-4-piperidyl)n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate
- 9) 2,4-bis[(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-6-(2-hydroxyethylamino-s-triazine,
- 10) bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)adipate,
- 11) 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine,
- 12) 1-(2-hydroxy-2-methylpropoxy)-4-hydroxy-2,2,6,6-tetramethylpiperidine,
- 13) 1-(2-hydroxy-2-methylpropoxy)-4-oxo-2,2,6,6-tetramethylpiperidine,
- 14) 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine,
- 15) bis(1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl)sebacate,
- 16) bis(1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl)adipate,
- 17) 2,4-bis{N-[1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl]-N-butyl-amino}-6-(2-hydroxyethylamino)-s-triazine,
- 18) 4-benzoyl-2,2,6,6-tetramethylpiperidine,
- 19) di-(1,2,2,6,6-pentamethylpiperidin-4-yl)p-methoxybenzylidenemalonate,
- 20) 4-stearyloxy-2,2,6,6-tetramethylpiperidine,
- 21) bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl)succinate,
- 22) 1,2,2,6,6-pentamethyl-4-aminopiperidine,
- 23) 2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro[4,5]decane,
- 24) tris(2,2,6,6-tetramethyl-4-piperidyl)nitrilotriacetate,
- 25) tris(2-hydroxy-3-(amino-(2,2,6,6-tetramethylpiperidin-4-yl)propyl)nitrilotriacetate,
- 26) tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate,
- 27) tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate,
- 28) 1,1′-(1,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone),
- 29) 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decan-2,4-dione,
- 30) 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,
- 31) 3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidin-2,5-dione,
- 32) 3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione,
- 33) N,N′-bis-formyl-N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine,
- 34) the reaction product of 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine with N,N′-bis(3-aminopropyl)ethylenediamine),
- 35) the condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid,
- 36) linear or cyclic condensates of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine,
- 37) linear or cyclic condensates of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1,3,5-triazine, 38) linear or cyclic condensates of N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine,
- 39) linear or cyclic condensates of N,N′-bis-(1,2,2,6,6-pentamethyl-4-piperidyl)-hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine,
- 40) the condensate of 2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1,3,5-triazine and 1,2-bis(3-aminopropylamino)ethane,
- 41) the condensate of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane,
- 42) a reaction product of 7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro[4,5]decane and epichlorohydrin,
- 43) poly[methyl, (3-oxy-(2,2,6,6-tetramethylpiperidin-4-yl)propyl)]siloxane, CAS#182635-99-0,
- 44) reaction product of maleic acid anhydride-C18-C22-α-olefin-copolymer with 2,2,6,6-tetramethyl-4-aminopiperidine,
- 45) the oligomeric compound which is the condensation product of 4,4′-hexamethylene-bis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,
- 46) the oligomeric compound which is the condensation product of 4,4′-hexamethylene-bis(amino-1,2,2,6,6-pentaamethylpiperidine) and 2,4-dichloro-6-[(1,2,2,6,6-pentaamethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,
- 47) the oligomeric compound which is the condensation product of 4,4′-hexamethylene-bis(amino-1-propoxy-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(1-propoxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,
- 48) the oligomeric compound which is the condensation product of 4,4′-hexamethylene-bis(amino-1-acyloxy-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(1-acyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine and
- 49) product obtained by reacting a product, obtained by reacting 1,2-bis(3-aminopropylamino)ethane with cyanuric chloride, with (2,2,6,6-tetramethylpiperidin-4-yl)butylamine.
- Also included are the sterically hindered N—H, N-methyl, N-methoxy, N-propoxy, N-octyloxy, N-cyclohexyloxy, N-acyloxy and N-(2-hydroxy-2-methylpropoxy) analogues of any of the above mentioned compounds. For example, replacing an N—H hindered amine with an N-methyl hindered amine would be employing the N-methyl analogue in place of the N—H.
- The benzofuranone and hindered amine stabilizers are employed at the same levels as present components i) and ii).
- The loss in stability of biodiesel may be observed by gum formation.
- The following Examples illustrate the present invention. Unless otherwise indicated, parts and percentages are by weight.
- The Rancimat test, developed by the food industry, is employed to test the oxidative stability of soy biodiesel (methyl ester of soy fatty acid). A 3.0 g sample of soy biodiesel is held at 111.7° C. and exposed to a bubbling stream of air (10 liters per hour). The sample vessel is vented to a secondary container, where the off-gases are bubbled through 50 mL of distilled water. The test measures the volatile oxidation decomposition products such as peroxides, alcohols, aldehydes and carboxylic acids. The volatile decomposition products (chiefly formic acid) are swept through the sample vessel and vented into the secondary container where they are trapped by the distilled water. The conductivity of the water is constantly monitored as a function of time through use of an electrode. The inflection point (not a specific value) of the conductivity curve is the measured induction time. It should be pointed out that some samples will be highly conductive before the inflection point is achieved, while others will only be slightly conductive. An increase of the induction time indicates an increase in oxidative stability. Results are in the tables below.
- Levels of additive are in weight percent based on the weight of the biodiesel.
- The present stabilizer combination of components i) and ii) provide for outstanding performance for the Rancimat test.
- A 6 hour induction time is necessary to meet the EN 14214 specification.
-
Rancimat Induction Time Induction Time additive (hours) none 4.0 2500 ppm A 10.9 2500 ppm P 10.3 2500 ppm Q 8.3 2500 ppm R 5.0 - The above experiment is repeated where the biodiesel is spiked with 5 ppm of copper. The first control formulation contains no copper.
-
Rancimat Induction Time Induction Time sample additive (hours) (control - no Cu) none 6.2 (control) none 2.8 test 2500 ppm A 8.1 test 1500 ppm A 6.2 test 250 ppm S 4.1 - Soy biodiesel is stored outdoors from Aug. 3, 2006 until Oct. 13, 2006 in Tarrytown, N.Y. The Rancimat induction times are monitored as a function of time (weeks) and additive level. The containers are closed and opened once per week for sampling. The following results are observed.
-
Rancimat Induction Time Induction Time Induction Time (hours) at Finish additive (hours) at Start (10 weeks) none 5.2 3.1 1000 ppm A 7.8 6.6 2500 ppm A 10.7 9.5 - The experiments are repeated with other fatty acid methyl esters, rapeseed oil methyl ester, recycled cooking oil methyl ester and jatropha oil methyl ester. The following induction time results are found.
-
Rancimat Induction Time (hours) no 500 ppm 1000 ppm 2500 ppm sample additive A additive A additive A additive A rapeseed oil 3.6 6.2 7.2 not performed recycled cooking oil 1.9 5.7 9.1 not performed jatropha oil 1.9 2.8 4.5 7.0 - Further rancimat induction time experiments in soy biodiesel are performed.
-
Rancimat Induction Time Induction Time additive (hours) none 4.4 2788 ppm A 9.5 2788 ppm B 9.5 2788 ppm C 7.9 2788 ppm D 4.2 2500 ppm P 9.3 2500 ppm Q 7.8 2500 ppm R 4.0 2500 ppm S 4.4 2500 ppm T 9.4 - These experiments are repeated with soy biodiesel spiked with 0.25 ppm Fe naphthenate and with 0.01 ppm Cu naphthenate.
-
Rancimat Induction Time Induction Time Induction Time (hours) (hours) additive 0.25 Fe spike 0.01 Cu spike none 3.2 2.8 2788 ppm A 8.7 7.6 2788 ppm B 8.2 7.4 2788 ppm C 7.9 6.8 2788 ppm D 3.6 3.2 2500 ppm P 7.9 6.4 2500 ppm Q 7.5 6.4 2500 ppm R 3.4 2.8 2500 ppm S 4.8 3.2 2500 ppm T 7.8 6.6 - Experiments are performed on a blend B20, 20% soy biodiesel and 80 petroleum diesel and on B20 spiked with 1 ppm Cu naphthenate.
-
Rancimat Induction Time Induction Time Induction Time (hours) (hours) B20 blend with additive B20 blend 1 ppm Cu spike none 10.6 1.2 1000 ppm A 33.5 4.5 1000 ppm G 29.1 4.2 1000 ppm H 33.0 3.9 - Experiments are performed in soy bioediesel spiked with different levels of Cu acetate. Induction time is in hours.
-
Rancimat Induction Time (hours) additive no metal 0.25 ppm Cu 0.5 ppm Cu 1 ppm Cu none 4.2 0.40 0.13 0.15 1000 ppm E 0.15 1000 ppm F 0.78 - Experiments are performed with soy biodiesel contaminated with mixed metals. The mixed metal spike is 0.00006 ppm Cu naphthenate and 0.0032 ppm Fe naphthenate.
-
Rancimat Induction Time Induction Time Induction Time (hours) mixed additive (hours) metal spike none 4.3 2.3 Additive S 4.5 2.0 Additive U 4.6 2.9 Additive E 6.7 3.5 - Additive P butylated hydroxytoluene (BHT)
Additive Q 2,6-di-tert-butylphenol
Additive R vitamin E
Additive S mixture of 4-(and 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole -
-
- 41% by weight tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane
- 29% by weight 2,6-di-tert-butylphenol
- 30% by weight methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate
Additive U 1-(di-(2-ethylhexyl)aminomethyl) 1,2,4-triazole
-
-
- 10% Additive S
-
-
- 10% Additive S
-
-
- 10% Additive S
-
-
- 10% Additive S
-
-
- 11% Additive S
-
-
- 11% Additive U
-
-
- 14% Additive S
-
-
- 14% Additive U
Claims (19)
1. A biodiesel fuel composition stabilized against the deleterious effects of heat, light, oxygen and metals, which composition comprises
a biodiesel fuel and
an effective stabilizing amount of a combination of
i) one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and
ii) one or more compounds selected from the group consisting of the triazole metal deactivators.
2. A composition according to claim 1 comprising one or more phenolic antioxidants selected from the group consisting of butylated phenol, butylated hydroxytoluene, butylated hydroxyanisole, tocopherol, benzylphosphonates, esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, esters of β-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols and esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols.
3. A composition according to claim 1 comprising one or more hindered phenolic antioxidants selected from the group consisting of 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol (BHT), 2,2′-methylene bis-(4,6-di-tert-butylphenol), 1,6-hexamethylene-bis-(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), ((3,5-bis(1,1-dimethylethyl)-4-hydroxphenyl)methylthio)acetic acid C10-C14 isoalkyl esters, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid C6-C9alkyl esters, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester, tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane, thiodiethylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate and 2,5-di-tert-butylhydroquinone.
4. A composition according to claim 1 comprising one or more hindered phenolic antioxidants selected from the group consisting of 2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester and tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane.
5. A composition according to claim 1 comprising one or more triazole metal deactivators selected from compounds of the formula
where
R1 and R2 are the same or different and are hydrogen, C1-C20alkyl, C3-C20alkenyl, C5-C12cycloalkyl, C7-C13aralkyl, C6-C10aryl or hydroxy or R1 and R2, together with the nitrogen atom to which they are each attached may form a 5-, 6- or 7-membered heterocylic ring, or R1 and R2 are a group of formula
R3X[(—R4—)O]n(—R4)—
R3X[(—R4—)O]n(—R4)—
where
X is O, S or NR3,
R3 is hydrogen or C1-C20alkyl,
R4 is C1-C12alkylene,
n is 0 or an integer from 1 to 6,
or one of R1 and R2 is a group of formula
6. A composition according to claim 5 comprising one or more triazole metal deactivators selected from the group consisting of
1-(or 4)-(dimethylaminomethyl)triazole,
1-(or 4)-(diethylaminomethyl)triazole,
1-(or 4)-(di-isopropylaminomethyl)triazole,
1-(or 4)-(di-n-butylaminomethyl)triazole,
1-(or 4)-(di-n-hexylaminomethyl)triazole,
1-(or 4)-(di-isooctylaminomethyl)triazole,
1-(or 4)-(di-(2-ethylhexyl)aminomethyl)triazole,
1-(or 4)-(di-n-octylaminomethyl)triazole,
1-(or 4)-(di-n-decylaminomethyl)triazole,
1-(or 4)-(di-n-dodecylaminomethyl)triazole,
1-(or 4)-(di-n-octadecylaminomethyl)triazole,
1-(or 4)-(di-n-eicosylaminomethyl)triazole,
1-(or 4)-[di-(prop-2′-enyl)aminomethyl]triazole,
1-(or 4)-[di-(but-2′-enyl)aminomethyl]triazole,
1-(or 4)-[di-(eicos-2′-enyl)aminomethyl]triazole,
1-(or 4)-(di-cyclohexylaminomethyl)triazole,
1-(or 4)-(di-benzylaminomethyl)triazole,
1-(or 4)-(di-phenylaminomethyl)triazole,
1-(or 4)-(4′-morpholinomethyl)triazole,
1-(or 4)-(1′-pyrrolidinomethyl)triazole,
1-(or 4)-(1′-piperidinomethyl)triazole,
1-(or 4)-(1′-perhydroroazepinomethyl)triazole,
1-(or 4)-(2′,2″-dihydroxyethyl)aminomethyl]triazole,
1-(or 4)-(dibutoxypropyl-aminomethyl)triazole,
1-(or 4)-(dibutylthiopropyl-aminomethyl)triazole,
1-(or 4)-(di-butylaminopropyl-aminomethyl)triazole,
N,N-bis-(1- or 4-triazolylmethyl)laurylamine,
N,N-bis-(1- or 4-triazolylmethyl)oleylamine,
N,N-bis-(1- or 4-triazolylmethyl)ethanolamine and
N,N,N′,N′-tetra(1- or 4-triazolylmethyl)ethylene diamine.
7. A composition according to claim 5 comprising 1-(di-isooctylaminomethyl)-1,2,4-triazole or 1-(di-(2-ethylhexyl)aminomethyl) 1,2,4-triazole.
9. A composition according to claim 8 comprising one or more triazole metal deactivators selected from the group consisting of
1-(2-methoxyprop-2-yl)tolyltriazole,
1-(1-methoxyethyl)tolyltriazole,
1-(1-methoxpropyl)tolyltriazole,
1-(1-isobutoxybutyl)tolyltriazole,
1-(1-tert-butoxybutyl)tolyltriazole,
1-(1-hexyloxybutyl)tolyltriazole,
1-(1-octyloxybutyl)tolyltriazole,
1-(1-butoxy-2-methylpropyl)tolyltriazole,
1-(1-dodecyloxybutyl)tolyltriazole,
1-(1-isopropyloxyethyl)tolyltriazole,
1-(1-isopropyloxypropyl)tolyltriazole,
1-(1-isopropyloxybutyl)tolyltriazole,
1-(1-cyclohexyloxypropyl)tolyltriazole,
1-(1-cyclohexyloxyheptyl)tolyltriazole,
1-(1-cyclohexyloxybutyl)tolyltriazole,
1-[1-(2-methoxyethoxy)butyl]tolyltriazole and
1-[1-(2-ethoxyethoxy)butyl]tolyltriazole.
10. A composition according to claim 8 comprising 1-(2-methoxyprop-2-yl)tolyltriazole, 1-(1-cyclohexyloxypropyl)tolyltriazole, 1-(1-cyclohexyloxyheptyl)tolyltriazole or 1-(1-cyclohexyloxybutyl)tolyltriazole.
11. A composition according to claim 1 comprising one or more triazole metal deactivators selected from compounds of the formula
where
R10 is hydrogen or C1-C12alkyl,
R11 at and R12 are the same or different and are hydrogen, C1-C20alkyl, C3-C20alkenyl, C5-C12cycloalkyl, C7-C13aralkyl, C6-C10aryl or hydroxy or R11 and R12, together with the nitrogen atom to which they are each attached may form a 5-, 6- or 7-membered heterocylic ring, or R11 and R12 are a group of formula
R13X[(—R14—)O]n(—R14)—
R13X[(—R14—)O]n(—R14)—
where
X is O, S or NR13,
R13 is hydrogen or C1-C20alkyl,
R14 is C1-C12alkylene,
n is 0 or an integer from 1 to 6,
or one of R11 and R12 is a group of formula
12. A composition according to claim 11 comprising one or more triazole metal deactivators selected from the group consisting of
4-(or 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(dimethylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(diethylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-isopropylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-butylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-hexylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-isooctylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-octylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-decylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-dodecylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-octadecylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-n-eicosylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-[di-(prop-2′-enyl)aminomethyl]-benzotriazole,
4-(or 5)-methyl-1-[di-(but-2′-enyl)aminomethyl]-benzotriazole,
4-(or 5)-methyl-1-[di-(eicos-2′-enyl)aminomethyl]-benzotriazole,
4-(or 5)-methyl-1-(di-cyclohexylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-benzylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(di-phenylaminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(4′-morpholinomethyl)-benzotriazole,
4-(or 5)-methyl-1-(1′-pyrrolidinomethyl)-benzotriazole,
4-(or 5)-methyl-1-(1′-piperidinomethyl)-benzotriazole,
4-(or 5)-methyl-1-(1′-perhydroroazepinomethyl)-benzotriazole,
4-(or 5)-methyl-1-(2′,2″-dihydroxyethyl)aminomethyl]-benzotriazole,
4-(or 5)-methyl-1-(dibutoxypropyl-aminomethyl)-benzotriazole,
4-(or 5)-methyl-1-(dibutylthiopropyl-aminomethyl)-benzotriazole and 4-(or 5)-methyl-1-(di-butylaminopropyl-aminomethyl)-benzotriazole.
13. A composition according to claim 11 comprising 4-(or 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole or 4-(or 5)-methyl-1-(di-isooctylaminomethyl)-benzotriazole.
14. A composition according to claim 1 comprising
one or more hindered phenolic antioxidants selected from the group consisting of 2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid methyl ester and tetrakis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionyloxymethyl)methane and
one or more triazole metal deactivators selected from the group consisting of
1-(di-isooctylaminomethyl)-1,2,4-triazole, 1-(di-(2-ethylhexyl)aminomethyl) 1,2,4-triazole, 1-(2-methoxyprop-2-yl)tolyltriazole, 1-(1-cyclohexyloxypropyl)tolyltriazole, 1-(1-cyclohexyloxyheptyl)tolyltriazole, 1-(1-cyclohexyloxybutyl)tolyltriazole, 4-(or 5)-methyl-1-(di(2-ethylhexyl)-aminomethyl)-benzotriazole and 4-(or 5)-methyl-1-(di-isooctylaminomethyl)-benzotriazole.
15. A composition according to claim 1 further comprising one or more stabilizers selected from the group consisting of the 3-arylbenzofuranone stabilizers and the hindered amine light stabilizers.
16. A composition according to claim 1 where the components i) and ii) each are present at levels of about 5 ppm to about 5000 ppm.
17. A composition according to claim 1 where the components i) and ii) each are present at levels of about 50 ppm to about 5000 ppm.
18. A process for the stabilization of a biodiesel fuel against the deleterious effects of heat, light, oxygen and metals, which process comprises
incorporating into a biodiesel fuel
an effective stabilizing amount of a combination of
i) one or more compounds selected from the group consisting of the sterically hindered phenolic antioxidants and
ii) one or more compounds selected from the group consisting of the triazole metal deactivators.
19. A composition according to claim 1 further comprising one or more compounds selected from the group consisting of the metal chelating compounds.
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- 2007-11-19 CA CA002670065A patent/CA2670065A1/en not_active Abandoned
- 2007-11-19 JP JP2009537612A patent/JP2010511067A/en active Pending
- 2007-11-19 WO PCT/EP2007/062482 patent/WO2008065015A1/en active Application Filing
- 2007-11-19 CN CNA2007800435957A patent/CN101541928A/en active Pending
- 2007-11-19 BR BRPI0719687-3A2A patent/BRPI0719687A2/en not_active IP Right Cessation
- 2007-11-19 EP EP07847200A patent/EP2087074A1/en not_active Withdrawn
- 2007-11-19 MX MX2009005565A patent/MX2009005565A/en unknown
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US20110146139A1 (en) * | 2008-09-17 | 2011-06-23 | Marc-Andre Poirier | Method for improving the oxidation stability of biodiesel as measured by the rancimat test |
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US20100107479A1 (en) * | 2008-11-04 | 2010-05-06 | Duncan Richardson | Antifoam fuel additives |
US9574150B2 (en) | 2008-11-04 | 2017-02-21 | Afton Chemical Corporation | Conductivity-improving additives for fuel |
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US8367593B2 (en) | 2009-10-02 | 2013-02-05 | Exxonmobil Research And Engineering Company | Method for improving the resistance to one or more of corrosion, oxidation, sludge and deposit formation of lubricating oil compositions for biodiesel fueled engines |
US20110130316A1 (en) * | 2009-10-02 | 2011-06-02 | Exxonmobil Research And Engineering Company | Method for improving the resistance to one or more of corrosion, oxidation, sludge and deposit formation of lubricating oil compositions for biodiesel fueled engines |
US8680029B2 (en) | 2009-10-02 | 2014-03-25 | Exxonmobil Research And Engineering Company | Lubricating oil compositions for biodiesel fueled engines |
US20110082062A1 (en) * | 2009-10-02 | 2011-04-07 | Exxonmobil Research And Engineering Company | Lubricating oil compositions for biodiesel fueled engines |
US8301359B1 (en) | 2010-03-19 | 2012-10-30 | HyCogen Power, LLC | Microprocessor controlled automated mixing system, cogeneration system and adaptive/predictive control for use therewith |
US8583350B1 (en) | 2010-03-19 | 2013-11-12 | HyCogen Power, LLC | Microprocessor controlled automated mixing system, cogeneration system and adaptive/predictive control for use therewith |
US10081773B2 (en) | 2011-07-12 | 2018-09-25 | Total Marketing Services | Additive compositions that improve the stability and the engine performances of diesel fuels |
US10538714B2 (en) | 2011-07-12 | 2020-01-21 | Total Marketing Services | Additive compositions that improve the stability and the engine performances of diesel fuels |
WO2013062840A1 (en) | 2011-10-28 | 2013-05-02 | Exxonmobil Research And Engineering Company | Dye-stable biofuel blend compositions |
US20150033617A1 (en) * | 2011-12-21 | 2015-02-05 | Total Marketing Services | Additive compositions for improving the lacquering resistance of higher grade fuels of the diesel or biodiesel type |
WO2014078083A1 (en) | 2012-11-19 | 2014-05-22 | The Lubrizol Corporation | Coupled phenols for use in biodiesel engines |
US10113132B2 (en) | 2012-11-19 | 2018-10-30 | The Lubrizol Corporation | Coupled phenols for use in biodiesel engines |
US20220145196A1 (en) * | 2019-04-10 | 2022-05-12 | Neste Oyj | Diesel fuel composition |
Also Published As
Publication number | Publication date |
---|---|
NZ576674A (en) | 2012-03-30 |
CN101541928A (en) | 2009-09-23 |
WO2008065015A1 (en) | 2008-06-05 |
CA2670065A1 (en) | 2008-06-05 |
BRPI0719687A2 (en) | 2013-12-24 |
EP2087074A1 (en) | 2009-08-12 |
MX2009005565A (en) | 2009-08-18 |
JP2010511067A (en) | 2010-04-08 |
KR20090089851A (en) | 2009-08-24 |
TW200846458A (en) | 2008-12-01 |
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