Storage stability gasoline

Properties Brownish-gray powder. D 1.37, starts to decompose above 200C, good storage stability. Insoluble in acetone, benzene, gasoline, ethylene dichloride, and water. 

Properties Light-brown, granular, waxy solid. D 0.99, mp 75-85C, good storage stability. Soluble in gasoline, benzene, ethylene dichloride, and acetone insoluble in water. 

Properties White to pale-yellow powder. D 1.63, melting range decomposes without melting when heated to 200C or over, excellent storage stability. Slightly soluble in ethylene dichloride and acetone insoluble in water, benzol, and gasoline. Available in pelletized form. 

Thus potential gum is determined by the accelerated gum test (ASTM D-873, IP 138), which is used as a safeguard of storage stability and can be used to predict the potential for gum formation during prolonged storage. In this test, the gasoline is heated for 16 h with oxygen under pressure in a bomb at 100°C (212°F). After this time, both the gum content and the solids precipitated are measured. 

The requirements for jet fuels stress a different combination of properties and tests than those required for aviation gasoline (ASTM D-1655). The same basic controls are needed for such properties as storage stability and corrosivity, but the gasoline antiknock tests are replaced by tests directly and indirectly controlling energy content and combustion characteristics. However, as with other petroleum products, application of sampling protocols (ASTM D-3700, ASTM D-4057, ASTM D-4177, ASTM D-4306, ASTM D-5842) is of prime importance. 

Using a conventional additive package, fixed-bed gasoline meets other quality standards such as storage stability, copper attack, multimetal corrosion, carburetor detergency, fi1terabi1ity, emulsion formation, and metals retention. 

Stabilization of Fuels and Lubricants. Gasoline and jet engine fuels contain unsaturated compounds that oxidize on storage, darken, and form gums and deposits. Radical scavengers such as 2,4-dimethyl-6-/ f2 butylphenol [1879-09-0] 2,6-di-/ f2 -butyl-/)-cresol (1), 2,6-di-/ f2 -butylphenol [128-39-2], and alkylated paraphenylene diamines ate used in concentrations of about 5—10 ppm as stabilizers. 

Stability—In petroleum products, the resistance to chemical change. Gum stability in gasoline means resistance to gum formation while in storage. Oxidation stability in lubricating oils and other products means resistance to oxidation to form sludge or gum in use. 

Dispensers for propane can be configured like dispensers for gasoline with readouts for gallons dispensed and accumulated total purchase price. Dispensers should be mounted on a concrete pad for stability and protection from corrosion, unless the dispenser is part of a complete storage and dispensing unit where the dispenser is mounted securely within the system. Dispensers cannot be mounted inside buildings, but can be mounted under canopies and can be protected from the elements as long as the area is ventilated and the perimeter is not more than 50% enclosed. The heart of a propane dispenser is the meter that measures the... 

Since base-stabilized NaBH solutions not in contact with catalyst are stable and produce virtually no H2, in the event of a leak or a spill, no H2 will be generated. Because little free H2 is actually stored in the system, concerns about onboard bulk H storage or distribution are reduced. As NaBH solutions are easier to store onboard a vehicle than H2 gas, these solutions offer a practical alternative to direct H2 fueling. NaBH solutions are also easier and safer to distribute to consumers than bottled H2 gas and can be easily transported from terminal locations to service stations via truck. NaBH solutions, with a viscosity and density close to that of water, can be dispensed in the same manner as gasoline with minor modification to the dispensing equipment. 

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