42 results about "Reid vapor pressure" patented technology

Methods and systems are provided for estimating fuel volatility. During a vehicle-off condition following a refueling event, fuel volatility may be estimated by operating a fuel pump of a fuel system immediately after the refueling event while a fuel tank temperature is stable. Based on estimated fuel volatility, fuel injection amount and leak test thresholds may be adjusted.

Provided is a novel high octane summer gasoline composition which is substantially free of oxygenates, and is in compliance with the California Predictive Model. The gasoline composition is suitable for use in the summer, i.e., having a Reid vapor pressure of 7.0 or less. The method for blending the gasoline comprises blending streams from a refinery in a controlled manner to maintain compliance with the California Predictive Model.

A method for an evaporative emissions leak test, comprising: adjusting a pressure threshold based on a fuel volatility of a fuel contained in a fuel tank; and performing the evaporative emissions leak test based on the adjusted pressure threshold. By determining fuel volatility and adjusting a pressure threshold based on the fuel volatility, a more robust and accurate evaporative emissions leak test may be employed without adding additional components to a fuel system.

The present invention provides a fuel for homogeneous charge compression ignition engines, which can achieve a stable homogeneous charge compression ignition at a higher output. The fuel satisfies the following requirements (1), (2), (3), and (4):(1) certain distillation characteristics between an initial boiling point (IBP): 0° C. or higher and 60° C. or lower; and an end point (EP): 250° C. or higher and 380° C. or lower;(2) research octane number: 62 or greater and 85 or less;(3) density at 15° C.: 0.700 g / cm3 or higher and lower than 0.800 g / cm3; and(4) Reid vapor pressure at 37.8° C.: 30 kPa or greater and lower than 65 kPa.

A method for rendering a high Reid Vapor Pressure natural gasoline feed suitable for addition to the gasoline pool by using steam stripping conditions that provide an overhead fraction that is suitable for thermal cracking, and a bottoms product that has a substantially reduced Reid Vapor Pressure as compared to the natural gasoline feed.

A fuel or fuel blendstock comprising ethanol, ethyl ethers, olefins, and alkanes. In some embodiments, the fuel or fuel blendstock of claim 1, wherein the fuel or fuel blendstock may have an octane number greater than 92 (RON+MON) / 2). In other embodiments, the fuel or fuel blendstock may have a Reid vapor pressure less than 7.2 psi. Also disclosed is a process for the production of a fuel, the process including: contacting ethanol and at least one gasoline fraction including alkanes and olefins in the presence of a catalyst to form a fuel mixture including ethyl ethers, alkanes, unreacted olefins, and unreacted ethanol; and recovering the fuel mixture for use as a gasoline or gasoline blendstock without separation of the ethanol from the fuel mixture.

The present invention is directed to an analyzer for measuring the vapor pressure of a hydrocarbon liquid. The analyzer includes a pressure measuring system connected to an air saturation system having a circulation chamber with opposing first and second ends. A first opening is disposed toward the first end and a second opening is disposed toward the second end. A plumbing system connects the first and second openings. A pump moves the hydrocarbon liquid through the plumbing system from the first opening to the second opening so as to saturate the hydrocarbon liquid with air. The air saturation system has a cooler for cooling the hydrocarbon liquid and the pressure measuring system has a heater for heating the hydrocarbon liquid. The pump may be a piston actuated pump or a motor-driven pump and the plumbing system may include an aeration chamber.

A firefighting training fluid (FFTF) comprising a paraffin blend. The blends of paraffins typically have no less than about two carbon atoms and no more than about twelve carbon atoms. The blends of paraffins may possess Reid vapor pressures in the range from about 2 to about 6.5 pounds per square inch. The blends also typically possess an initial boiling point of not less than about 80 degrees Fahrenheit and an end boiling point of not more than about 370 degrees Fahrenheit. The blends burn relatively cleanly and keep emissions of volatile organic compounds, compounds containing sulfur, smoke, particulates, olefins, and aromatics to a minimum. The blend components mixed to create the blends of paraffins are controlled in order to maintain Reid vapor pressure and initial and end boiling points. Oxygenates may be added to an FFTF in order to further reduce smoke emissions.

The invention discloses high-proportion methanol gasoline for a vehicle. The methanol gasoline comprises the following components in percentage by weight: 74 to 88.5 percent of methanol, 5 to 10 percent of low-carbon oxygen-containing component oil, 1 to 3 percent of mixed C5, 2 to 6 percent of mixed ether, 2 to 3 percent of C4 hydrocarbon, 1 to 2 percent of mixed alcohol and 0.5 to 2 percent of liquefied petroleum gas, wherein the low-carbon oxygen-containing component oil consists of 70 percent of dimethoxymethane and 30 percent of gasoline hydrocarbon with final boiling point less than 200DEG C; the mixed C5 consists of 80 percent of C5 alkane and 20 percent of C5 alkene; the C4 hydrocarbon is butane; and the mixed alcohol consists of ethanol, n-propanol and iso-propanol in the weight ratio of 4 to 3 to 3. In the preparation method, the high-proportion methanol gasoline product with reid vapor pressure (RVP) value ranging from 82 to 101kpa is prepared at the temperature of between-30 and 15 DEG C; and the method comprises the following steps of: uniformly mixing the components in weight percentage in the claim 1; and filling a preparation tank with the C4 hydrocarbon and the liquefied petroleum gas by using a dispenser to prepare the methanol gasoline. The methanol gasoline and the method have the advantages of making full use of the excess methanol resource, saving the petroleum resource, improving the cold start performance and solving the problem that high-proportion methanol gasoline can not be used in cold area.

The method of adding to gasoline which has been stored in a container, of relatively small size for a substantial period of time to cause substantial loss of the more volatile gasoline components, an additive composition which comprises a flammable organic liquid having a Reid vapor pressure of 2 to 18 psig, to improve starting capacity of a motor fueled by said gasoline.