Jun 15, 2015 1 answer to cetane number, cetane number 910678. Mengenal cetane number pada bahan bakar diesel otomotif. The cetane number cn is expressed in terms of the volume percent of cetane c 16 h 34 which has high ignition cn 100 in a mixture with alphamethylnaphthalene c 11 h 10 which has low ignition quality cn 0. Maka tak heran jika lebih banyak orang yang familiar dengan kata oktan ketimbang cetane number cn atau setana. Cetane is a collection of unbranched open chain alkane molecule that ignites very easily under compression, so it was assigned a cetane number of 100, while alphamethyl naphthalene was assigned a cetane number of 0. Aromatic ketones from chemical group 21 opinion of the scientific panel on food additives, flavourings, processing aids and materials in contact with food. Cetane is the chemical compound with chemical formula nc 16 h 34, today named hexadecane according to iupac rules. These days, heptamethyl nonane with a cetane number of 15 is used in place of alpha methyl naphthalene because it is a more stable reference.
They proposed the alpha isomer of cetene and mesitylene 1,3,5trimethylbenzene as the primary reference fuels. The most widely used reference fuel is a mixture of cetane and alphamethylnaphthalene. Pdf experimental determination and prediction of liquid. With alkali metals, 1methylnaphthalene forms radical anion salts such as sodium 1methylnaphthalenide.
Cetane is the chemical compound with chemical formula n c 16 h 34, today named hexadecane according to iupac rules. The cetane number measures the ignition quality of a diesel fuel. Naphthalene # naphthalene in the interstellar medium. All other hydrocarbon s in diesel fuel are indexed to cetane as to how well they ignite under compression. Compared to its structural analog sodium naphthalenide, sodium 1methylnaphthalenide is more soluble, which is useful for lowtemperature reductions see also. It is based on the amount of time between fuel injection and ignition, also known as ignition delay. Ch3ch214ch3 cetanec16h34 methyl naphthalenec11h10 cetane no. Octane number is defined as the percentage, by volume, of isooctane in the mixture of isooctane and hheptane. Cetane number is a relative ranking of a fuels autoignition characteristics for use in compression ignition engines. The cetane number therefore measures how quickly the fuel starts to burn auto. It was found to be difficult to control the location. Currently, heptamethyl nonane with a cetane number of 15 is used in place of alpha methyl. In the range of 71 to 34 cetane numbers, the primary reference fuel blends alpha methyl naphthalene n cetane and heptamethylnonane n cetane and the secondary reference blends gave virtually the same compression ratios. Panjiva uses over 30 international data sources to help you find qualified vendors of methyl naphthalene.
Isopropyl nitrate and dii levels in racing diesel fuel. It has a role as a carcinogenic agent and a plant metabolite. It is an unbranched alkane, a saturated hydrocarbon chain with no cycles. Structure, properties, spectra, suppliers and links for. Methyl2naphthalene permanent link for this species. Naphtha is hydrotreated for removal of metal and sulphur.
Methylnaphthalene appears as bluishbrown oil or a clear yellow liquid. Better antiknock quality allows us to compress the airfuel mixture to a larger extent befo. Cetane number is defined as the percentage, by volume, of ncetane in the mixture of ncetane and alpha methyl naphthalene. Recommendation for alphanaphthyl methyl ketone usage levels up to. Chemical kinetics research on hcci and diesel fuels.
The cetane number cn is expressed in terms of the volume percent of cetane c 16 h 34 which has high ignition cn 100 in a mixture with alpha methyl naphthalene c 11 h 10 which has low ignition quality cn 0. In this method a standard reference fuel is used in a test cylinder. It is the percentage of cetane contained in the standard solution which has an ignition delay equalling the ignition delay of fuel tested. Cetane ignites very easily under compression, so it was assigned a cetane number of 100, while alpha methyl naphthalene was assigned a cetane number of 0. Cetane number is defined as the percentage, by volume, of n cetane in the mixture of n cetane and alpha methyl naphthalene. This structure is also available as a 2d mol file or as a computed 3d sd file the 3d structure may be viewed using java or javascript. When you have a chance please visit the shown link and read. All other hydrocarbons in diesel fuel are indexed to cetane as to how well they ignite under compression. Cetane has an extremely high ignition quality ignites quickly and is rated for the test at 100.
Cetane is a collection of unbranched open chain alkane molecule that ignites very easily under compression, so it was assigned a cetane number of 100, while alpha methyl naphthalene was assigned a cetane number of 0. These experts collectively have knowledge of naphthalene, 1methylnaphthalene, and 2methylnaphthalenes physical and chemical properties, toxicokinetics, key health end points, mechanisms of action, human and animal exposure, and quantification of risk to humans. Dearomatization for kerosene to improve cetane number, which is the percentage of pure cetane in a blend of cetane and alpha methyl naphthalene. Recommendation for 1,2,3,4tetrahydro1methyl naphthalene usage levels up to.
View page or view pdf flavouring group evaluation 16, revision 1 fge. Search results for methyl naphthalene at sigmaaldrich. The cetane ch which is a straight chain paraffin, is assigned a cetane number of a. Alpha methyl naphthalene c h has a cetane number of a 0 b 50 c 100 d 120. Normal setana memiliki cetane number 100, alpha methyl naphtalene memiliki cetane number 0, dan. While cetane number can be defined as the percentage,by volume, of ncetane in the mixture of ncetane and alpha methyl naphthalene. Skala cetane number biasanya menggunakan referensi berupa campuran antara normal setana c16h34 dengan alpha methyl naphthalene c10h7ch3 atau dengan heptamethylnonane c16h34. Cetane is an unbranched open chain alkane molecule that ignites very easily under compression, so it was assigned a cetane number of 100, while alphamethyl naphthalene was assigned a.
Padahal keduanya adalah ukuran tertentu dari bahan bakar yang dikonsumsi masingmasing mesin. Two compounds have been selected as standard hexadecane has been assigned cetane number 100 while alfa methyl naphthalene is assigned zero cetane number on the basis of ignition property. Recommendation for 1,2,3,4tetrahydro1 methyl naphthalene usage levels up to. It is the % volume of cetane nhexadecane, cetane number 100 in alpha methyl naphthalene cetane number 0, that provides the specified standard of degrees crankshaft angle ignition delay at the identical compression ratio to that of the fuel sample. Search results for naphthalene methanol at sigmaaldrich. Since it was expected that many fuels used in this work would have cetane numbers below 15, a supply of 99percent pure alpha methyl naphthalene was obtained which is believed to be of higher purity than the old astm grade material. Recommendation for 1,2,3,4tetrahydro1methyl naphthalene flavor usage levels up to.
The latter matches the ignition quality of kerosene sample. Since it was expected that many fuels used in this work would have cetane numbers below 15, a supply of 99percent pure alphamethyl naphthalene was obtained which is believed to be of higher purity than the old astm grade material. Cetane number of alpha methyl naphthalene is assumed to be. Dearomatization for kerosene to improve cetane number, which is the percentage of pure cetane in a blend of cetane and alphamethylnaphthalene. Octane number is the ability of resistance of a fuel to knocking in comparison to isooctane, which has octane number 100 and has high antiknock quality. Cetane ignites very easily under compression, so it was assigned a cetane number of 100, while alphamethyl naphthalene was assigned a cetane number of 0. Cetane number menunjukkan kemampuan bahan bakar untuk menyala sendiri. While cetane number can be defined as the percentage,by volume, of n cetane in the mixture of n cetane and alpha methyl naphthalene.
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