Degraded MMT will settle to the bottom of the container as a rust colored material that can clog fuel lines and filters. Octane is a hydrocarbon and an alkane with the chemical formula C8H18, and the condensed structural formula CH3(CH2)6CH3. Sunoco Race Fuels, 1-Octene is one of the important linear alpha olefins in industry. Click here to view our storage recommendations. We have test results confirming octane stability in our unleaded, leaded, ethanol-free and ethanol fuels. Pump fuels with high (12 pounds/square inch, psi) vapor pressures are used in cold weather to prevent engine starting issues due to low temperatures. These stable hydrocarbons can last 2-3 times longer than 87 octane fuel. Special thanks goes to Minnesota State University Mankato, Automotive Engineering Technology students for suggesting the topic of this article. As the months pass during storage these unstable components react to form gums, varnishes and lower octane hydrocarbons. Colorless liquid with a gasoline-like odor. It is necessary to briefly review what octane is in order to dive deeper into stability issues. Point (o C) Boiling Point (o C) State at 25 o C: methane: CH 4-183-164: gas: ethane: C 2 H 6 … The components used in Sunoco race fuels are very stable and can retain octane in excess of 2 years when properly stored. It’s no surprise because selecting octane of gasoline is the only choice the consumer has, except what station to buy it from. Engines must use the proper octane fuel to avoid knock and provide reliable operation. The higher boiling point means vapor pressure decreases won’t be as common until the fuel is exposed to temperatures above 80°F. CopyCopied, TVMXDCGIABBOFY-UHFFFAOYSA-N That is why we provide proper storage information on our website. Acta, 41(7), 1958, 1915-1932., ACD/Labs Percepta Platform - PhysChem Module, US Environmental Protection Agency’s EPISuite™, Compounds with the same molecular formula, Search Google for structures with same skeleton, 257-259 F / 760 mmHg (125-126.1111 °C / 760 mmHg), 258 F / 760 mmHg (125.5556 °C / 760 mmHg), Soluble in ether, Slightly soluble in alcohol. If the fuel tank is vented to atmosphere the butane can start to evaporate out unless the daily temperatures are below freezing. Keep in mind that 93 octane fuels are still susceptible to octane loss and vapor pressure decreases due to butane evaporation. Essentially, these numbers provide a scale to measure how much heat and pressure can be put on the fuel before it spontaneously combusts. In this article we will focus on octane stability of 87 and 93 octane pump fuels versus racing fuels and what you can do to prevent octane loss in your fuel. Butane is a volatile gasoline component used to tailor vapor pressure in accordance with seasonal needs. Octane stability in racing fuels is much different because fuel quality is valued more than production cost, unlike the pump gas industry where cost drives the majority of refining decisions. NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data) Fuel exposed to the atmosphere can lose light components within a couple of days. A straight chain alkane composed of 8 carbon atoms. West Conshohocken, PA: ASTM International, 2003. It is also used as a solvent and in organic synthesis. 2. Boiling Point: 126.4±3.0 °C at 760 mmHg Vapour Pressure: 14.2±0.1 mmHg at 25°C Enthalpy of Vaporization: 34.4±0.0 kJ/mol Flash Point: 15.6±0.0 °C Index of Refraction: Gas-chromatographische Charakterisierung organischer Verbindungen. MMT is a very effective octane booster and doesn’t harm oxygen sensors or catalytic converters so, it is ideal for modern vehicles. s; CAS no: 111659; Data type: Normal alkane RI value specified by scale definition; Authors: von Kovats, E., 206. 1-Octene is an organic compound with a formula CH2CHC6H13. The butane vapor pressure issue is addressed with the use of chemical components that boil around 80°F. AKI is the average of Research octane number (RON) and Motor octane number (MON)(Totten). Property Name Property Value Reference; Molecular Weight: 193.12 g/mol: Computed by PubChem 2.1 (PubChem release 2019.06.18) XLogP3: 4.9: Computed by XLogP3 3.0 (PubChem release 2019.06.18) InChI=1S/C8H18/c1-3-5-7-8-6-4-2/h3-8H2,1-2H3 The higher boiling point means vapor pressure decreases won’t be as common until the fuel is exposed to temperatures above 80°F. Cold weather fuel has higher concentrations of butane. Spontaneous combustion is a source of engine knock which can quickly damage an engine. Octane ratings are important because different engines expose fuel to different amounts of pressure and heat. Stale fuel doesn’t evaporate as easily and can cause rough engine idle and hard starting. A key aspect of gasoline stability is vapor pressure. Print. Sunoco 260 GT Plus is our only race fuel that contains MMT. Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. CopyCopied, CSID:349, (accessed 17:39, Nov 25, 2020) Pump fuels are limited to 7.8-9psi maximum in warm weather depending on county and state ( Butane has a high blending octane value which helps manufacturers hit their octane targets. This is determined by how much pressure builds up inside a sealed fuel container when the fuel is heated to 100°F. A large part of any quality race fuel is consistency. One of these isomers, 2,2,4-trimethylpentane (commonly called iso-octane) is used as one of the standard values in the octane rating scale. Proper storage can preserve octane for years but improper storage can reduce octane and degrade fuel within weeks. Explain. n-Octane (C 8 H 18) is a colorless liquid that is insoluble in water.It is obtained by fractional distillation of petroleum. Organic Compound; Gasoline Additive/Component; Food Toxin; Metabolite; Industrial/Workplace Toxin; Natural Compound, DANGER: FLAMMABLE, causes CNS injury, lung & eye irritation, P210-P261-P301+P310-P303+P361+P353-P405-P501a, Eye: Irrigate immediately Skin: Soap wash promptly Breathing: Respiratory support Swallow: Medical attention immediately, inhalation, ingestion, skin and/or eye contact, Irritation eyes, nose; drowsiness; dermatitis; chemical pneumonitis (aspiration liquid); in animals: narcosis, Eyes, skin, respiratory system, central nervous system, Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation, NIOSH REL : TWA 75 ppm (350 mg/m 3 ) C 385 ppm (1800 mg/m 3 ) [15-minute] OSHA PEL ? Totten, George E., Steven R. Westbrook, and Rajesh J. Shah.