AU2019240290A1 - Composition and method for preventing or reducing low speed pre-ignition in spark-ignited internal combustion engines - Google Patents
Composition and method for preventing or reducing low speed pre-ignition in spark-ignited internal combustion engines Download PDFInfo
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- AU2019240290A1 AU2019240290A1 AU2019240290A AU2019240290A AU2019240290A1 AU 2019240290 A1 AU2019240290 A1 AU 2019240290A1 AU 2019240290 A AU2019240290 A AU 2019240290A AU 2019240290 A AU2019240290 A AU 2019240290A AU 2019240290 A1 AU2019240290 A1 AU 2019240290A1
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- 238000000034 method Methods 0.000 title claims abstract description 14
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/22—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/16—Hydrocarbons
- C10L1/1608—Well defined compounds, e.g. hexane, benzene
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
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Abstract
Fuel and lubricant compositions are provided that contain a primary low-speed pre-ignition (LSPI)-reducing additive comprising (i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N=C-X motif additive. Methods for preventing or reducing low speed pre-ignition events in spark-ignited engines using these compositions are also provided.
Description
COMPOSITION AND METHOD FOR PREVENTING OR REDUCING LOW SPEED
PRE-IGNITION IN SPARK-IGNITED INTERNAL COMBUSTION ENGINES
TECHNICAL FIELD
[001] This disclosure relates to fuel and lubricant compositions for spark- ignited engines and methods for preventing or reducing low speed pre-ignition events using the same.
BACKGROUND
[002] Turbocharged or supercharged engines (i.e., boosted internal combustion engines) may exhibit an abnormal combustion phenomenon known as stochastic pre-ignition or low-speed pre-ignition (or "LSPI"). LSPI is an event that may include very high pressure spikes, early combustion during an inappropriate crank angle, and knock. All of these, individually and in combination, have the potential to cause degradation and/or severe damage to the engine. However, because LSPI events occur only sporadically and in an uncontrolled fashion, it is difficult to identify the causes for this phenomenon and to develop solutions to suppress it.
[003] Pre-ignition is a form of combustion that results in ignition of the air-fuel mixture in the combustion chamber prior to the desired ignition of the air-fuel mixture by the igniter. Pre-ignition has typically been a problem during high load engine operation since heat from operation of the engine may heat a part of the combustion chamber to a sufficient temperature to ignite the air-fuel mixture upon contact. This type of pre-ignition is sometimes referred to as hot-spot pre-ignition.
[004] More recently, intermittent abnormal combustion has been observed in boosted internal combustion engines at low speeds and medium-to-high loads. For example, during operation of the engine at 3000 rpm or less, under load, with a brake mean effective pressure (BMEP) of at least 10 bar, low-speed pre-ignition (LSPI) may occur in a random and stochastic fashion. During low speed engine operation, the compression stroke time is longest.
[005] Previous studies have demonstrated that turbocharger use, engine design, engine coatings, piston shape, fuel choice, and/or engine oil additives may contribute to an increase in LSPI events. Accordingly, there is a need for fuel and engine oil additive components and/or combinations that are effective to reduce or eliminate LSPI.
SUMMARY
[006] In one aspect, there is provided a fuel composition comprising (1) greater than 50 wt % of a hydrocarbon fuel boiling in the gasoline or diesel range and (2) a minor amount of one or more of: a primary low-speed pre-ignition (LSPI)-reducing additive comprising (i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N=C-X motif additive
having a structure of , wherein X1 and X2 are independently H, C, N,
O, or S; and wherein X1 or X2 independently includes one or more C1-C20 alkyl group or one or more aromatic group.
[007] In another aspect, there is provided a fuel concentrate comprising (1) from 90 to 30 wt % of an organic solvent boiling in a range of from 65°C to 205°C and (2) from 10 to 70 wt % of an additive component selected from one or more of (i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N=C-X motif additive having a structure
of , wherein X1 and X2 are independently H, C, N, O, or S; and wherein
Xi or X2 independently includes one or more C1 -C20 alkyl group or one or more aromatic group.
[008] In a further aspect, there is provided a lubricating oil composition comprising (1) greater than 50 wt % of a base oil and (2) 0.01 to 15 wt % of a component selected from one or more of a primary low-speed pre-ignition (LSPI)- reducing additive comprising (i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N=C-X
motif additive having a structure of , wherein Xi and X2 are independently H, C, N, O, or S; and wherein Xi or X2 independently includes one or more Ci -C2o alkyl group or one or more aromatic group.
DETAILED DESCRIPTION
Introduction
[009] In this specification, the following words and expressions, if and when used, have the meanings ascribed below.
[010] "Gasoline" or "gasoline boiling range components" refers to a composition containing at least predominantly C4-Ci2 hydrocarbons. In one embodiment, gasoline or gasoline boiling range components is further defined to refer to a composition containing at least predominantly C4-Ci2 hydrocarbons and further having a boiling range of from about 100°F (37.8°C) to about 400°F (204°C). In an alternative embodiment, gasoline or gasoline boiling range components is defined to refer to a composition containing at least predominantly C4-Ci2 hydrocarbons, having a boiling range of from about 100°F (37.8°C) to about 400°F (204°C), and further defined to meet ASTM D4814.
[01 1] The term "diesel" refers to middle distillate fuels containing at least predominantly Cio-C2s hydrocarbons. In one embodiment, diesel is further defined to refer to a composition containing at least predominantly Cio-C2s hydrocarbons, and further having a boiling range of from about 165.6°C (330°F) to about 371.1°C (700°F).
In an alternative embodiment, diesel is as defined above to refer to a composition containing at least predominantly C10-C25 hydrocarbons, having a boiling range of from about 165.6°C (330°F) to about 371.1°C (700°F), and further defined to meet ASTM D975.
[012] The term "oil soluble" means that for a given additive, the amount needed to provide the desired level of activity or performance can be incorporated by being dissolved, dispersed or suspended in an oil of lubricating viscosity. Usually, this means that at least 0.001 % by weight of the additive can be incorporated in a lubricating oil composition. The term "fuel soluble" is an analogous expression for additives dissolved, dispersed or suspended in fuel.
[013] The term "alkyl" refers to saturated hydrocarbon groups, which can be linear, branched, cyclic, or a combination of cyclic, linear and/or branched.
[014] An "alkanol" is an alkyl group, as described herein, having a hydroxy substituent (i.e., an— OH group).
[015] A "minor amount" means less than 50 wt % of a composition, expressed in respect of the stated additive and in respect of the total weight of the composition, reckoned as active ingredient of the additive.
[016] An "analog" is a compound having a structure similar to another compound but differing from it in respect to a certain component such as one or more atoms, functional groups, substructures, which are replaced with other atoms, groups, or substructures.
[017] A "homolog" is a compound belonging to a series of compounds that differ from each other by a repeating unit. Alkanes are examples of homologs. For example, ethane and propane are homologs because they differ only in the length of a repeating unit (-CH2-). A homolog may be considered a specific type of analog.
[018] A "derivative" is a compound that is derived from a similar compound via a chemical reaction (e.g., acid-base reaction, hydrogenation, etc.). In the context of substituent groups, a derivative may be a combination of one or more moiety. For example, a phenol moiety may be considered a derivative of aryl moiety and hydroxyl
moiety. A person of ordinary skill in the related art would know the metes and bounds of what is considered a derivative. The term "substituted" refers to a substitution or replacement of an atom or atoms of a compound. As an illustrative example, a "substituted alkyl group" may refer to, among other things, an ethanol.
[019] An "engine" or a "combustion engine" is a heat engine where the combustion of fuel occurs in a combustion chamber. An "internal combustion engine" is a heat engine where the combustion of fuel occurs in a confined space ("combustion chamber"). A "spark ignition engine" is a heat engine where the combustion is ignited by a spark, usually from a spark plug. This is contrast to a "compression-ignition engine," typically a diesel engine, where the heat generated from compression together with injection of fuel is sufficient to initiate combustion without an external spark.
Low Speed Pre-Ignition (LSPI)
[020] Low Speed Pre-Ignition (LSPI) is most or more likely to occur in direct- injected, boosted (turbocharged or supercharged), spark-ignited (gasoline) internal combustion engines that, in operation, generate a brake mean effective pressure level of greater than 1000 kPa (10 bar) at engine speeds of from 1500 to 2500 rotations per minute (rpm), such as at engine speeds of from 1500 to 2000 rpm. "Brake mean effective pressure" (BMEP) is defined as the work accomplished during on engine cycle, divided by the engine swept volume, the engine torque normalized by engine displacement. The word "brake" denotes the actual torque or power available at the engine flywheel, as measured on a dynamometer. Thus, BMEP is a measure of the useful energy output of the engine.
[021] It has now been found that the fuel compositions or lubricating oil compositions of this disclosure which are particularly useful in high pressure spark- ignited internal combustion engines and, when used in the high-pressure spark- ignited internal combustion engines, will prevent or minimize engine knocking and pre-ignition problems.
Primary LSPI-Reducing Additives
[022] The following are descriptions of primary additives that can be utilized as a fuel or lubricant additive to reduce LSPI activity. Primary LSPI-reducing additives can be used as standalone additives and/or with other primary additive(s) and/or with of one or more secondary LSPI-reducing additive (described later). When more than one additive is used, the additives may be in salt form. Moreover, when two or more additives are used, there may be synergy between the two or more additives. In general, these additives are fuel or oil soluble at concentrations needed to achieved a desired LSPI reduction level. Table 1 summarizes the primary additive types.
Table 1
1. Amino Additives
b-Amino Alkanol
[023] The fuel additive or lubricating oil additive of this disclosure may be a b- amino alkanol, a substituted b-amino alkanol, a derivative thereof or an acceptable salt thereof. Useful b-amino alkanols include those that can be represented by the following general formula:
Formula 1 wherein Ri, R2, R3, and R4 are each independently selected from hydrogen and a C1 - C20 alkyl (e.g., Ci-C6 alkyl) group; and two or more of R1, R2, R3, and R4 optionally can be bonded together to form a ring structure (e.g., a five-, six-, or seven-membered ring). In some embodiments, R1, R2, R3, and R4 may independently include one or more aromatic rings.
[024] The b-amino alkanol has at least 2 carbon atoms (e.g., from 4 to 30 carbon atoms, from 4 to 20 carbon atoms, from 4 to 16 carbon atoms, from 4 to 12 carbon atoms, from 5 to 30 carbon atoms, from 5 to 20 carbon atoms, from 5 to 16 carbon atoms, or from 5 to 12 carbon atoms).
[025] Representative examples of suitable b-amino alkanols include ethanolamine (Formula 1A), 1 -amino-2-propanol (Formula 1 B), alaninol (Formula 1C), 2-(methylamino)ethanol (Formula 1 D), 2-(ethylamino)ethanol (Formula 1 E), 2- amino-2-methyl-1 -propanol (Formula 1 F), 2-amino-1 -butanol (Formula 1G), 2- amino-1 -pentanol (Formula 1 H), valinol (Formula 11), 2-amino-1 -hexanol (Formula U), leucinol (Formula 1 K), isoleucinol (Formula 1 L), cycloleucinol (Formula 1 M), cyclohexylglycinol (Formula 1 N), prolinol (Formula 10), 2-(hydroxymethyl)piperidine (Formula 1 P), 2-aminocyclopentanol (Formula 1 Q), and 2-aminocyclohexanol (Formula 1 R). Representative structures are shown below.
Formula ID Formula IE Formula IF
Formula 1J Formula IK Formula 1L
Formula IP Formula IQ Formula 1R
Formula IS
Amino Acid
[026] The fuel additive or lubricating oil additive of this disclosure may be an aliphatic amino acid, a substituted aliphatic amino acid, or a derivative thereof, or an acceptable salt thereof. Useful amino acids include those that can be represented by the following general formula:
Formula 2 wherein R is an "aliphatic" or "aromatic" side chain. Amino acid side chains can be broadly classified as aromatic or aliphatic. An aromatic side chain includes an aromatic ring. Examples of amino acids with aromatic side chains include for example, histidine (Formula 2A), phenylalanine (Formula 2B), tyrosine (Formula 2C), tryptophan (Formula 2D) and the like. Non-aromatic side chains are broadly grouped as "aliphatic" and include, for example, alanine (Formula 2E), glycine (Formula 2F), cysteine (Formula 2G), and the like.
[027] The amino acid(s) can be natural and/or non-natural cc-amino acids. Natural amino acids are those encoded by the genetic code, as well as amino acids derived therefrom. These include, for example, hydroxyproline (Formula 2H), g- carboxyglutamate (Formula 21), and citrulline (Formula 2J). In this specification, the term "amino acid" also includes amino acid analogs and mimetics. Analogs are
compounds having the same general structure of a natural amino acid, except that the R group is not one found among the natural amino acids.
[028] Representative examples of analogs of naturally occurring amino acids include homoserine (Formula 2K), norleucine (Formula 2L), homoproline (Formula 2M) and proline (Formula 2N). An amino acid mimetic is a compound that has a structure different from the general chemical structure of an a-amino acid but functions in a manner similar to one. The amino acid may be an L- or D-amino acid. Representative structures are shown below.
Formula 2C Formula 2D
Formula 2G Formula 2H
Formula 2K Formula 2L
Formula 2M Formula 2N
Amino Ester
[029] The fuel additive or lubricating oil additive of this disclosure may be an amino ester, a substituted amino ester, or a derivative thereof, or an acceptable salt thereof. Amino esters can be derived from amino acids (as described above) and alcohols. Amino esters and amino acids may be considered derivatives of each other. Useful amino esters include those that can be represented by the following general formula:
Formula 3
wherein R is an aliphatic side chain and Ri is a carbon chain 1 to 20 carbon atoms in length, preferably 1 to 4 carbon atoms, in particular, methanol or ethanol, preferably methanol.
[030] The amino esters may include aromatic or aliphatic side chains. Representative examples of amino esters include methyl alaninate (Formula 3A), ethyl alaninate (Formula 3B), methyl glycinate (Formula 3C), and ethyl glycinate (Formula 3D). Representative structures are shown below.
Formula 3C Formula 3D
2. N=C-X Motif Additives
[031] A fuel additive or lubricating oil additive of this disclosure may have a N=C-X motif as shown in the generalized structure below
Formula 4 wherein R is H, monovalent organic group, or monovalent heterorganic group (described in greater detail below), Xi and X2 are independently H, C, N, O, or S and wherein Xi or X2 independently includes one or more Ci-C2o alkyl group (e.g., Ci-C6
alkyl) or one or more aromatic ring. In some embodiments, X1 and X2 may include a cyclic structure (e.g., a five-, six-, or seven-membered ring). Cyclic structures may be aromatic or non-aromatic, as well as vary from being fully saturated to fully unsaturated. Suitable examples of additives compatible with Formula 4 include amidines, guanidines, imidazoles, benzamidines, benzimidazoles, and aminobenzimidazoles.
Amidine
[032] The fuel additive or lubricating oil additive of this disclosure may be an amidine, a substituted amidine, or a derivative thereof or an acceptable salt thereof. Useful amidines include those that can be represented by the following general formula:
Formula 5 wherein R¾, R6, R7 and Rs are each independently selected from hydrogen, monovalent organic groups, monovalent heterorganic groups (e.g., comprising nitrogen, oxygen, sulfur or phosphorus, in the form of groups or moieties that are bonded through a carbon atom and that do not contain acid functionality such as carboxylic or sulfonic), and combinations thereof; and wherein any two or more of R¾, R6, R7 and Rs optionally can be bonded together to form a cyclic structure (e.g., a five-, six, or seven-membered ring). The cyclic structures may be aromatic or non-aromatic, as well as vary from being fully saturated to fully unsaturated. The organic and heterorganic groups may have from 1 to 10 carbon atoms (e.g., 1 to 6 carbon atoms).
[033] Representative examples of suitable amidines include 1, 4,5,6- tetrahydropyrimidine (Formula 5A), 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine (Formula 5B), 1,2-diethyl-1,4,5,6-tetrahydropyrimidine (Formula 5C), 1,5-
diazabicyclo[4.3.0]non-5-ene (DBN; Formula 5D), 1,8-diazabicyclo[5.4.0]-undeca-7- ene (DBU; Formula 5E), benzamidine (Formula 5F), benzimidazole (Formula 5G) and 2-phenyl-1 H-benzo[d]imidazole (Formula 5M). Representative structures are shown below.
Formula 5D Formula 5E Formula 5F
Formula 5J Formula 5K Formula 5L
Formula 5M
Guanidine
[034] The fuel additive or lubricating oil additive of this disclosure may be a guanidine, a substituted guanidine, or a derivative thereof, or an acceptable salt
thereof. Useful guanidines include those that can be represented by the following general formula,
Formula 6 wherein Rg, R10, Rn, R12 and R13 are each independently selected from hydrogen, monovalent organic groups, monovalent heterorganic groups (e.g., comprising nitrogen, oxygen, sulfur or phosphorus, in the form of groups or moieties that are bonded through a carbon atom and that do not contain acid functionality such as carboxylic or sulfonic), and combinations thereof; and wherein any two or more of Rg, R10, R11, R12 and R13 optionally can be bonded together to form a cyclic structure (e.g., a five-, six, or seven-membered ring). The cyclic structures may be aromatic or non aromatic, as well as vary from being fully saturated to fully unsaturated. The organic and heterorganic groups may have from 1 to 10 carbon atoms (e.g., 1 to 6 carbon atoms).
[035] Representative examples of suitable guanidines include 1, 1,3,3- tetramethylguanidine (TMG; Formula 6A), 2-tert-butyl-1,1,3,3-tetramethylguanidine (BTMG; Formula 6B), 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD; Formula 6C), 7-methyl- 1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD; Formula 6D) and 1,2-diphenylguanidine (Formula 61). Representative structures shown below.
Formula 6A Formula 6B
Formula 6E Formula 6F
Formula 61
Imidazoles
[036] The fuel additive or lubricating oil additive of this disclosure may be an imidazole, a substituted imidazole, or a derivative thereof, or an acceptable salt thereof. Suitable imidazoles include imidazole (Formula 7 A), 1 -methylimidazole (Formula 7B), 1 -ethylimidazole (Formula 7D), 1 -propylimidazole (Formula 7E), 1 -n- butylimidazole (Formula 7F), 1 -decylimidazole, 1 -dodecylimidazole, 2- methylimidazole (Formula 7G), 2-ethylimidazole, 2-isopropylimidazole (Formula 7H), 4-methylimidazole (Formula 71), 1,2-dimethylimidazole (Formula 7J), 2-ethyl-4(5)-
methylimidazole (Formula 7K), and 1 -vinylimidazole (Formula 7L). Representative structures are shown below.
Formula 7D Formula 7E Formula 7F
Formula 7G Formula 7H Formula 71
Formula 7J Formula 7K Formula 7L
3. Triazole Additives
[037] The fuel additive or lubricating oil additive of this disclosure may be a triazole, a substituted triazole, or a derivative thereof, or an acceptable salt thereof. Suitable triazoles include 1, 2, 3-triazole (Formula 8A), 5,6-dimethylbenzotriazole (Formula 8B), and 1, 2, 4-triazole (Formula 8C). Representative structures are shown below.
Formula 8A Formula 8B
Formula 8C Formula 8D
4. Benzamidinium Additives
[038] The fuel additive or lubricating oil additive of this disclosure may be a benzamidinium, a substituted benzamidinium, or a derivative thereof, or an acceptable salt thereof. Useful benzamidinium additives include those that can be represented by the following general formula 9, wherein Ri, R2, and R3 are independently C1-C20 alkyl groups.
Formula 9
[039] Suitable benzamidiniums include N,N-dimethyl-N-octylbenzamidium-2- oxide (Formula 9A). Representative structures are shown below.
Formula 9A
Formula 9B Formula 9C
5. Benzoxazole Additives
[040] The fuel additive or lubricating oil additive of this disclosure may be a benzoxazole, a substituted benzoxazole, or a derivative thereof, or an acceptable salt thereof. Suitable benzoxazoles include benzoxazole (Formula 10A) and 2- aminobenzoxazole (Formula 10B). Representative structures are shown below.
Formula 10A Formula 10B
6. Amine Additives
Aromatic amine
[041] The fuel additive or lubricating oil additive of this disclosure may be an aromatic amine, a substituted aromatic amine, or a derivative thereof, or an acceptable salt thereof. Aromatic amine additives can have the generalized structure shown in Formula 1 1 -1 or 1 1 -2,
Formula 11-1 Formula 11-2
wherein R is independently one or more H or C1-C20 alkyl group and X is N (e.g., R-N- R) or O .
[042] Suitable aromatic amines include 2-methylquinolin-8-amine (Formula 11 A). Representative structures are shown below.
Formula 11C
Aliphatic amine
[043] Suitable aliphatic amines are shown below.
Formula 12C Formula 12D
Secondary LSPI-Reducing Additives
[044] The following are descriptions of secondary LSPI-reducing additives that can be utilized as fuel or lubricating additives to reduce LSPI activity. In general, a secondary LSPI-reducing additive, a substituted secondary LSPI-reducing additive, or a derivative thereof will be used in their salt form and in combination with a primary additive to reduce LSPI activity. For example, b-amino alkanol (primary additive) and aliphatic acid (secondary additive) can be combined and utilized as an LSPI additive. Table 2 lists the secondary additive types. Some additives can act as a primary additive and/or secondary additive.
Table 2
7. Acid Additives
Aliphatic Acid
[045] Aliphatic acids are non-aromatic carboxylic acids. Suitable aliphatic acids include mono-carboxylic acids having the following structure
Formula 13 wherein R is an aliphatic group having between 2 to 20 carbon atoms. The aliphatic group may be linear or branched and may contain heteroatoms.
[046] Suitable aliphatic acids include hexanoic acid (Formula 13A), heptanoic acid (Formula 13B), octanoic acid (Formula 13C), nonanoic acid (Formula 13D), decanoic acid (Formula 13E), undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid (C20), behenic acid (C22), 2-ethylbutyric acid (Formula 13F), 3,3-dimethylbutyric acid, 2-methylpentanoic acid (C6), 2-methylhexanoic acid (C7), 4- methylhexanoic acid (C7), 5-methylhexanoic acid (C7), 2,2-dimethylpentanoic acid (C7), 2-propylpentanoic acid (Cs), 2-ethylhexanoic acid (Formula 13G), 2-methylheptanoic acid (Cs), isooctanoic acid (Cs), 3,5,5-trimethylhexanoic acid (Cg), 4-methyloctanoic acid (Cg), 4-methylnonanoic acid, (C10), isodecanoic acid (C10), 2-butyloctanoic acid (C12), isotridecanoic acid (C13), 2-hexyldecanoic acid (C16), isopalmitic acid (C16), isostearic acid (Formula 13H), 3-cyclohexylpropionic acid, 4-cyclohexylbutyric acid (Formula 131), and cyclohexanepentanoic acid. Representative structures are shown below.
Formula 13A Formula 13B
Formula 13E Formula 13F
Formula 131 Formula 13J
Unsaturated Acid
[047] Suitable unsaturated acids include any organic acids that contain double or triple carbon-carbon bond. Representative unsaturated acids include maleic acid (Formula 14A), fumaric acid (Formula 14B), as well as unsaturated fatty acids such as palmitoleic acid (Formula 14C) and oleic acid (Formula 14D). Representative structures are shown below.
Formula 14D
Alkylaromatic Acid
[048] Suitable alkylaromatic acids include both mono-carboxylic acids and dicarboxylic acids. The alkyl carboxylic acid may have 6 or more carbon atoms (e.g., 6 to 24 carbon atoms, 6 to 20 carbon atoms, 8 to 24 carbon atoms, 8 to 20 carbon atoms, or even 8 to 18 carbon atoms). The alkyl moiety may be optionally substituted with one or more substituents such as hydroxy, alkoxy and carbonyl (e.g., aldehydic or ketonic) groups. Suitable examples of alkylaromatic acid include methylbenzoic acid (Formula 15A) and ethylbenzoic acid (Formula 15B). Representative structures are shown below.
Formula 15A Formula 15B Formula 15C
Aromatic Acid
[049] Suitable aromatic acids include both mono-carboxylic acids and dicarboxylic acids. The alkyl carboxylic acid may have 6 or more carbon atoms (e.g., 6
to 24 carbon atoms, 6 to 20 carbon atoms, 8 to 24 carbon atoms, 8 to 20 carbon atoms, or even 8 to 18 carbon atoms). The alkyl moiety may be optionally substituted with one or more substituents such as hydroxy, alkoxy and carbonyl (e.g., aldehydic or ketonic) groups. Suitable aromatic acids include benzoic acid (Formula 16A), hydroxybenzoic acid (Formula 16B), and tetralin carboxylic acid (Formula 16C). Representative structures are shown below.
Formula 16A Formula 16B Formula 16C
Hydroxy Acid
[050] Suitable hydroxy acids include those that can be represented by the following general formula:
Formula 17 wherein n = 1 to 3. Suitable examples of hydroxy acid include glycolic acid (Formula 17A), lactic acid (Formula 17B), malic acid (Formula 17C), tartaric acid (Formula 17D), and citric acid (Formula 17E). Representative structures are shown below.
Formula 17A Formula 17B Formula 17C
Formula 17D Formula 17E
Amino Acid
[051] Amino acids can be utilized as primary and/or secondary additives. Suitable amino acids were previously described above.
8. Phenol Additives
Phenol
[052] Suitable phenols include, thymol (Formula 18A), eugenol (Formula 18B), hydroquinone (Formula 18C), resorcinol (Formula 18D), cresol (Formula 18E) and 2-methylquinolin-8-ol (Formula 18G). Representative structures are shown below.
Formula 18D Formula 18E Formula 18F
Formula 18G
9. 1,3 Dicarbonyl Additives
1, 3 Diketone
[053] Suitable examples of 1,3 diketone compounds include acetylacetone (Formula 19A), , and curcumin (Formula 19B). Representative structures are shown below.
Formula 19B
1,3 Ketoester
[054] Suitable 1,3 ketoesters are shown below.
o o
NAA
Formula 20A Formula 20B
10. Hydroxamide Additives
[055] A hydroxamide is a hydroxy derivative of an amide. Useful hydroxamides include those that can be represented by the following general formula:
Formula 21 wherein Ri and R2 are each independently selected from hydrogen or Ci-C2o (e.g., C3- C12) alkyl group. Suitable hydroxamide includes hydroxy methylacetamide (Formula 21A). Representative structures are shown below.
Formula 1 A Formula 2 IB Formula 21C
1 1. Antioxidant Additives
[056] Suitable antioxidants include both mono-carboxylic acids and dicarboxylic acids. The alkyl carboxylic acid may have 6 or more carbon atoms (e.g., 6 to 24 carbon atoms, 6 to 20 carbon atoms, 8 to 24 carbon atoms, 8 to 20 carbon atoms, or even 8 to 18 carbon atoms). The alkyl moiety may be optionally substituted with one or more substituents such as hydroxy, alkoxy and carbonyl (e.g., aldehydic or ketonic) groups. Suitable antioxidants include the following.
Formula 22A
12. Salicylate Additives
Salicylate
[057] Suitable salicylates include 2-hydroxy-5-(tetracosa-
1 ,3, 5, 7, 9, 1 1 , 13, 15, 17, 19,21 ,23-dodecayn- 1 -yl)benzoic acid— dihydrogen (Formula 23E). Suitable salicylates are shown below.
Formula 23D Formula 23E
Salts
[058] The salts of this disclosure may be prepared by conventional means, for example, by mixing the primary additive with a suitable secondary additive in an aprotic solvent. The order in which one additive is added to the other is not important. The primary additive and secondary additive are usually mixed together in an approximately equimolar ratio. An excess of the primary or secondary additive component may be used. For example, the molar ratio of base relative to the alkyl carboxylic acid may be about 1.05:1 to 2:1 (e.g., 1.1 :1 to 1.5:1). Representative salts are shown below.
Formula 24D
Formula 24E
Formula 241
Formula 24J
Formula 24N
Formula 240
Formula 24S
Formula 24W
Formula 24AA
Fuel Compositions
[059] The compounds of the present disclosure may be useful as additives in hydrocarbon fuels to prevent or reduce engine knock or pre-ignition events in spark- ignited internal combustion engines.
[060] The concentration of the compounds of the present disclosure in hydrocarbon fuel may range from 25 to 5000 parts per million (ppm) by weight (e.g., 50 to 1000 ppm).
[061] The compounds of the present disclosure may be formulated as a concentrate using an inert stable oleophilic (i.e., soluble in hydrocarbon fuel) organic solvent boiling in a range of 65°C to 205°C. An aliphatic or an aromatic hydrocarbon solvent may be used, such as benzene, toluene, xylene, or higher-boiling aromatics or aromatic thinners. Aliphatic alcohols containing 2 to 8 carbon atoms, such as ethanol, isopropanol, methyl isobutyl carbinol, n-butanol and the like, in combination with the hydrocarbon solvents are also suitable for use with the present additives. In the concentrate, the amount of the additive may range from 10 to 70 wt % (e.g., 20 to 40 wt %).
[062] In gasoline fuels, other well-known additives can be employed including oxygenates (e.g., ethanol, methyl tert- butyl ether), other anti-knock agents, and detergents/dispersants (e.g., hydrocarbyl amines, hydrocarbyl poly(oxyalkylene) amines, succinimides, Mannich reaction products, aromatic esters of polyalkylphenoxyalkanols, or polyalkylphenoxyaminoalkanes). Additionally, friction modifiers, antioxidants, metal deactivators and demulsifiers may be present.
[063] In diesel fuels, other well-known additives can be employed, such as pour point depressants, flow improvers, cetane improvers, and the like.
[064] A fuel-soluble, non-volatile carrier fluid or oil may also be used with compounds of this disclosure. The carrier fluid is a chemically inert hydrocarbon- soluble liquid vehicle which substantially increases the non-volatile residue (NVR), or solvent-free liquid fraction of the fuel additive composition while not overwhelmingly contributing to octane requirement increase. The carrier fluid may be a natural or
synthetic oil, such as mineral oil, refined petroleum oils, synthetic polyalkanes and alkenes, including hydrogenated and unhydrogenated polyalphaolefins, synthetic polyoxyalkylene-derived oils, such as those described in U.S. Patent Nos. 3,756,793; 4,191,537; and 5,004,478; and in European Patent Appl. Pub. Nos. 356,726 and 382,159.
[065] The carrier fluids may be employed in amounts ranging from 35 to 5000 ppm by weight of the hydrocarbon fuel (e.g., 50 to 3000 ppm of the fuel). When employed in a fuel concentrate, carrier fluids may be present in amounts ranging from 20 to 60 wt % (e.g., 30 to 50 wt %).
Lubricating Oil Compositions
[066] The compounds of the present disclosure may be useful as additives in lubricating oils to prevent or reduce engine knock or pre-ignition events in spark- ignited internal combustion engines.
[067] The concentration of the compounds of the present disclosure in the lubricating oil composition may range from 0.01 to 15 wt % (e.g., 0.5 to 5 wt %), based on the total weight of the lubricating oil composition.
[068] The oil of lubricating viscosity (sometimes referred to as "base stock" or "base oil") is the primary liquid constituent of a lubricant, into which additives and possibly other oils are blended, for example to produce a final lubricant (or lubricant composition). A base oil, which is useful for making concentrates as well as for making lubricating oil compositions therefrom, may be selected from natural (vegetable, animal or mineral) and synthetic lubricating oils and mixtures thereof.
[069] Definitions for the base stocks and base oils in this disclosure are the same as those found in American Petroleum Institute (API) Publication 1509 Annex E ("API Base Oil Interchangeability Guidelines for Passenger Car Motor Oils and Diesel Engine Oils," December 2016). Group I base stocks contain less than 90% saturates and/or greater than 0.03% sulfur and have a viscosity index greater than or equal to 80 and less than 120 using the test methods specified in Table E-1. Group II base stocks contain greater than or equal to 90% saturates and less than or equal to 0.03% sulfur and have a viscosity index greater than or equal to 80 and less than 120 using the test
methods specified in Table E-1. Group III base stocks contain greater than or equal to 90% saturates and less than or equal to 0.03% sulfur and have a viscosity index greater than or equal to 120 using the test methods specified in Table E-1. Group IV base stocks are polyalphaolefins (PAO). Group V base stocks include all other base stocks not included in Group I, II, III, or IV.
[070] Natural oils include animal oils, vegetable oils (e.g., castor oil and lard oil), and mineral oils. Animal and vegetable oils possessing favorable thermal oxidative stability can be used. Of the natural oils, mineral oils are preferred. Mineral oils vary widely as to their crude source, for example, as to whether they are paraffinic, naphthenic, or mixed paraffinic-naphthenic. Oils derived from coal or shale are also useful. Natural oils vary also as to the method used for their production and purification, for example, their distillation range and whether they are straight run or cracked, hydrorefined, or solvent extracted.
[071] Synthetic oils include hydrocarbon oil. Hydrocarbon oils include oils such as polymerized and interpolymerized olefins (e.g., polybutylenes, polypropylenes, propylene isobutylene copolymers, ethylene-olefin copolymers, and ethylene- alphaolefin copolymers). Polyalphaolefin (PAO) oil base stocks are commonly used synthetic hydrocarbon oil. By way of example, PAOs derived from Cs to Ci4 olefins, e.g., C¾ C10, C12, Cu olefins or mixtures thereof, may be utilized.
[072] Other useful fluids for use as base oils include non-conventional or unconventional base stocks that have been processed, preferably catalytically, or synthesized to provide high performance characteristics.
[073] Non-conventional or unconventional base stocks/base oils include one or more of a mixture of base stock(s) derived from one or more Gas-to-Liquids (GTL) materials, as well as isomerate/isodewaxate base stock(s) derived from natural wax or waxy feeds, mineral and or non-mineral oil waxy feed stocks such as slack waxes, natural waxes, and waxy stocks such as gas oils, waxy fuels hydrocracker bottoms, waxy raffinate, hydrocrackate, thermal crackates, or other mineral, mineral oil, or even non-
petroleum oil derived waxy materials such as waxy materials received from coal liquefaction or shale oil, and mixtures of such base stocks.
[074] Base oils for use in the lubricating oil compositions of present disclosure are any of the variety of oils corresponding to API Group I, Group II, Group III, Group IV, and Group V oils, and mixtures thereof, preferably API Group II, Group III, Group IV, and Group V oils, and mixtures thereof, more preferably the Group III to Group V base oils due to their exceptional volatility, stability, viscometric and cleanliness features.
[075] Typically, the base oil will have a kinematic viscosity at 100°C (ASTM D445) in a range of 2.5 to 20 mm2/s (e.g., 3 to 12 mm2/s, 4 to 10 mm2/s, or 4.5 to 8 mm2/s).
[076] The present lubricating oil compositions may also contain conventional lubricant additives for imparting auxiliary functions to give a finished lubricating oil composition in which these additives are dispersed or dissolved. For example, the lubricating oil compositions can be blended with antioxidants, ashless dispersants, anti-wear agents, detergents such as metal detergents, rust inhibitors, dehazing agents, demulsifying agents, friction modifiers, metal deactivating agents, pour point depressants, viscosity modifiers, antifoaming agents, co-solvents, package compatibilizers, corrosion-inhibitors, dyes, extreme pressure agents and the like and mixtures thereof. A variety of the additives are known and commercially available. These additives, or their analogous compounds, can be employed for the preparation of the lubricating oil compositions of the invention by the usual blending procedures.
[077] Each of the foregoing additives, when used, is used at a functionally effective amount to impart the desired properties to the lubricant. Thus, for example, if an additive is an ashless dispersant, a functionally effective amount of this ashless dispersant would be an amount sufficient to impart the desired dispersancy characteristics to the lubricant. Generally, the concentration of each of these additives, when used, may range, unless otherwise specified, from about 0.001 to about 20 wt %, such as about 0.01 to about 10 wt %.
EXAMPLES
[078] The following illustrative examples are intended to be non-limiting.
EXAMPLES 1 -45
[079] The test compounds were blended in gasoline or lube oil and their capacity for reducing LSPI events were determined using the test method described below.
[080] A GM 2.0 L LHU 4-cylinder gasoline turbocharged direct-injected engine was used for LSPI testing. Each cylinder was equipped with a combustion pressure sensor.
[081] A six-segment test procedure was used to determine the number of LSPI events that occurred under conditions of an engine speed of 2000 rpm and a load of 275 Nm. The LSPI test condition is run for 28 minutes with each segment separated by an idle period. The first segment is used to condition the oil and the number of LSPI events are not counted. Each segment is slightly truncated to eliminate the transient portion. Each truncated segment typically has approximately 100,000 combustion cycles (25,000 combustion cycles per cylinder). In total, the five truncated segments where LSPI events are counted have approximately 500,000 combustion cycles (125,000 combustion cycles per cylinder). There may be instances of shortened tests in the event the engine cannot complete all six segments.
[082] LSPI-impacted combustion cycles were determined by monitoring peak cylinder pressure (PP) and crank angle at 5% total heat release (AI5). LSPI-impacted combustion cycles are defined as having both (1) a PP greater than five standard deviations than the average PP for a given cylinder and truncated segment and (2) an AI5 greater than five standard deviations less than the average for a given cylinder and truncated segment.
[083] The LSPI frequency is reported as the number of LSPI-impacted combustion cycles per million combustion cycles and is calculated as follows:
LSPI Frequency = [(Total Number of LSPI Impacted Combustion Cycles in five Truncated Segments)/(Total Number of Combustion Cycles In five Truncated Segments )] c 1,000,000
[084] An additive associated with a test fuel and/or test lubricant that reduces the LSPI frequency, when compared to the corresponding baseline fuel and/or baseline lubricant, is considered an additive that mitigates LSPI frequency. For testing herein, the baseline fuel was a conventional 49-state premium unleaded gasoline fuel without any deposit control additives and the baseline lubricant was representative of a conventional engine oil meeting ILSAC GF-5 and API SN specifications. In some of the tests, tetralin was added to the gasoline to promote LSPI. The test results are set forth in Table 2.
TABLE 2 O
O
o o
C/I
n H w
o o
C/I o o\
o
O o o\
C/I
n H w o o
C/I o> o
o
O o o\
C/I
n H w o o
C/I
o> o
o
O o o\
C/I
n H w o o
C/I
o> o
Claims (39)
1. A fuel composition comprising (1) greater than 50 wt % of a hydrocarbon fuel boiling in the gasoline or diesel range and (2) a minor amount of one or more of: a primary low-speed pre-ignition (LSPI)-reducing additive comprising (i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N=C-X motif additive having a structure of
wherein Xi and X2 are independently H, C, N, O, or S; and wherein Xi or X2 independently includes one or more Ci -C2o alkyl group or one or more aromatic group.
2. The fuel composition of claim 1, wherein the amino additive is a beta-amino alkanol, an amino acid, or an amino ester.
3. The fuel composition of claim 1, wherein the amine additive is aromatic amine or aliphatic amine.
4. The fuel composition of claim 1, wherein the triazole additive is 5,6- dimethyl benzotriazole.
5. The fuel composition of claim 1, wherein the primary LSPI-reducing additive is prolinol, aliquat, morphguam, 2-aminobenzimidazole, AHPD, N,N-dimethyl-N- octylbenzamidinium-2-oxide, benzoxazole, 2-methylquinolin-8-amine, or 2- aminobenzoxazole.
6. The fuel composition of claim 1, wherein the N=C-X motif additive is an amidine, a guanidine, an imidazole, a benzamidine, a benzimidazole, or an amino benzimidazole.
7. The fuel composition of claim 6, wherein the amidine is 1, 4,5,6- tetrahydropyrimidine, 1,2-dimethyl- 1,4, 5, 6-tetrahydropyrimidine, 1, 2-diethyl-1, 4,5,6- tetrahydropyrimidine, 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 2-phenyl-1 H- benzo[d]imidazole, or 1,8-diazabicyclo[5.4.0]-undece-7-ene (DBU).
8. The fuel composition of claim 6, wherein the guanidine is 1, 1,3,3- tetramethylguanidine (TMG), 2-tert-butyl-1,1,3,3-tetramethylguanidine(BTMG), 1,5,7- triazabicyclo[4.4.0]dec-5-ene (TBD), 1,2-diphenylguanidine, or 7-methyl-1,5,7- triazabicyclo[4.4.0]dec-5-ene (MTBD).
9. The fuel composition of claim 1, further comprising:
a secondary LSPI-reducing additive comprising an acid additive, a phenol additive, a 1,3 dicarbonyl additive, a hydroxamide additive, antioxidant additive, or salicylate additive.
10. The fuel composition of claim 9, wherein the primary LSPI-reducing additive and the secondary LSPI-reducing additive form a salt.
1 1. The fuel composition of claim 9, wherein the acid additive is an aliphatic acid, an unsaturated acid, an alkylaromatic acid, an aromatic acid, a hydroxy acid, or an amino acid.
12. The fuel composition of claim 9, wherein the secondary LSPI-reducing additive is 2-ethylhexanoate, isostreate, proline, diketone, oleate, toluene, tetraline carboxylate,
phenoxide, phenol carboxylate, hydroxy acid, 2-hydroxy-5-(tetracosa- 1,3, 5, 7, 9,1 1,13,15,17,19,21,23-dodecayn-1 -yl)benzoic acid— dihydrogen or ketoester.
13. A fuel concentrate comprising (1) from 90 to 30 wt % of an organic solvent boiling in a range of from 65°C to 205°C and (2) from 10 to 70 wt % of an additive component selected from one or more of
(i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N =C-X motif additive having a structure of
wherein Xi and X2 are independently H, C, N, O, or S; and wherein Xi or X2 independently includes one or more Ci-C2o alkyl group or one or more aromatic group.
14. The fuel concentrate of claim 13, wherein the amino additive is a beta-amino alkanol, an amino acid, or an amino ester.
15. The fuel concentrate of claim 13, wherein the amine additive is aromatic amine or aliphatic amine.
16. The fuel concentrate of claim 13, wherein the triazole additive is 5,6- dimethyl benzotriazole.
17. The fuel concentrate of claim 13, primary LSPI-reducing additive is prolinol, aliquat, morphguam, 2-aminobenzimidazole, AHPD, N,N-dimethyl-N-
octylbenzamidinium-2-oxide, benzoxazole, 2-methylquinolin-8-amine, or 2- aminobenzoxazole.
18. The fuel concentrate of claim 13, wherein the N=C-X motif additive is an amidine, a guanidine, an imidazole, a benzamidine, a benzimidazole, or an amino benzimidazole.
19. The fuel concentrate of claim 18, wherein the amidine is 1, 4,5,6- tetrahydropyrimidine, 1,2-dimethyl- 1,4, 5, 6-tetrahydropyrimidine, 1, 2-diethyl-1, 4,5,6- tetrahydropyrimidine, 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 2-phenyl-1 H- benzo[d]imidazole, or 1,8-diazabicyclo[5.4.0]-undece-7-ene (DBU).
20. The fuel concentrate of claim 18, wherein the guanidine is 1, 1,3,3- tetramethylguanidine (TMG), 2-tert-butyl-1,1,3,3-tetramethylguanidine(BTMG), 1,5,7- triazabicyclo[4.4.0]dec-5-ene (TBD), 1,2-diphenylguanidine, or 7-methyl-1,5,7- triazabicyclo[4.4.0]dec-5-ene (MTBD).
21. The fuel concentrate of claim 13, further comprising:
a secondary LSPI-reducing additive comprising an acid additive, a phenol additive, a 1,3 dicarbonyl additive, a hydroxamide additive, an antioxidant additive, or a salicylate additive.
22. The fuel concentrate of claim 21, wherein the acid additive is an aliphatic acid, an unsaturated acid, an alkylaromatic acid, an aromatic acid, a hydroxy acid, or an amino acid.
23. The fuel concentrate of claim 21, wherein the secondary LSPI-reducing additive is 2-ethylhexanoate, isostreate, proline, diketone, oleate, toluene, tetraline carboxylate, phenoxide, phenol carboxylate, hydroxy acid, or ketoester.
24. A lubricating oil composition comprising (1) greater than 50 wt % of a base oil and (2) 0.01 to 15 wt % of a component selected from one or more of
a primary low-speed pre-ignition (LSPI)-reducing additive comprising (i) an amino additive, (ii) an amine additive, (iii) a triazole additive, (iv) a benzamidinium additive, (v) a benzoxazole additive, or (vi) a N=C-X motif additive having a structure of
wherein Xi and X2 are independently H, C, N, O, or S; and wherein Xi or X2 independently includes one or more Ci -C2o alkyl group or one or more aromatic group.
25. The lubricating oil composition of claim 24, wherein the amino additive is a beta-amino alkanol, an amino acid, or an amino ester.
26. The lubricating oil composition of claim 24, wherein the amine additive is aromatic amine or aliphatic amine.
27. The lubricating oil composition of claim 24, wherein the triazole additive is 5,6- dimethyl benzotriazole.
28. The lubricating oil composition of claim 24, wherein the primary LSPI-reducing additive is prolinol, aliquat, morphguam, 2-aminobenzimidazole, AHPD, N,N- dimethyl-N-octylbenzamidinium-2-oxide, benzoxazole, 2-methylquinolin-8-amine, or 2-aminobenzoxazole.
29. The lubricating oil composition of claim 24, wherein the N=C-X motif additive is an amidine, a guanidine, an imidazole, a benzamidine, a benzimidazole, or an amino benzimidazole.
30. The lubricating oil composition of claim 29, wherein the amidine is 1, 4,5,6- tetrahydropyrimidine, 1,2-dimethyl- 1,4, 5, 6-tetrahydropyrimidine, 1, 2-diethyl-1, 4,5,6- tetrahydropyrimidine, 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 2-phenyl-1 H- benzo[d]imidazole, or 1,8-diazabicyclo[5.4.0]-undece-7-ene (DBU).
31. The lubricating oil composition of claim 29, wherein the guanidine is 1, 1,3,3- tetramethylguanidine (TMG), 2-tert-butyl-1,1,3,3-tetramethylguanidine(BTMG), 1,5,7- triazabicyclo[4.4.0]dec-5-ene (TBD), 1,2-diphenylguanidine, or 7-methyl-1,5,7- triazabicyclo[4.4.0]dec-5-ene (MTBD).
32. The lubricating oil composition of claim 24, further comprising:
a secondary LSPI-reducing additive comprising an acid additive, a phenol additive, a 1,3 dicarbonyl additive, a hydroxamide additive, antioxidant additive, or salicylate additive.
33. The lubricating oil composition of claim 32, wherein the secondary LSPI- reducing additive is 2-ethylhexanoate, isostreate, proline, diketone, oleate, toluene, tetraline carboxylate, phenoxide, phenol carboxylate, hydroxy acid, or ketoester.
34. A method for preventing or reducing low speed pre-ignition events in a spark- ignited internal combustion engine, the method comprising supplying to the engine the lubricating oil composition comprising of claim 24.
35. The method of claim 34, wherein the spark-ignited internal combustion engine is operated at a speed of less than 3000 rpm.
36. The method of claim 34, wherein the spark-ignited internal combustion engine is operated under a load with a brake mean effective pressure of at least 10 bar (1 MPa).
37. A method for preventing or reducing low speed pre-ignition events in a spark- ignited internal combustion engine, the method comprising supplying to the engine the fuel composition comprising of claim 1.
38. The method of claim 37, wherein the spark-ignited internal combustion engine is operated at a speed of less than 3000 rpm.
39. The method of claim 37, wherein the spark-ignited internal combustion engine is operated under a load with a brake mean effective pressure of at least 10 bar (1 MPa).
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US62/767,686 | 2018-11-15 | ||
PCT/IB2019/052366 WO2019180685A1 (en) | 2018-03-23 | 2019-03-22 | Composition and method for preventing or reducing low speed pre-ignition in spark-ignited internal combustion engines |
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