The resistance to detonation in spark-ignition or compression-ignition internal combustion engines. The product, alkylate (an isoparaffin) has a high octane value and is blended into motor and aviation gasoline to improve the antiknock value of the fuel. propylene, butylene) through the control of temperature and pressure in the presence of an acid catalyst, usually sulphuric acid or hydrofluoric acid. Typical routes include Caribbean exports to the US Gulf, lightering movements in the US Gulf, North African exports to Southern Europe, North Sea and Baltic exports to Northern Europe and South East Asian exports to the Far East.Ī refining process for chemically combining isobutane with olefinic hydrocarbons (e.g. Aframaxes tend to carry dirty cargoes, most often in parcel sizes of 70,000 or 80,000 tonnes (500,000 to 700,000 barrels). The adjustments also tend to be larger in percentage terms and, in some cases, need to include estimates of bunker fuel demand or refinery fuel use which were missing from the original data.Īframax vessels are tankers with a deadweight between 75,000 and 119,999 tonnes.
However, final annual data are generally only available for the year (12-18 months before the current year) and, therefore, adjustments have to be made to historical data and forecasts. Monthly and quarterly non-OECD data are adjusted using the same procedure as for the OECD once the annual data become available. Annual non-OECD data are obtained from a wide range of sources including governments, industry and international organisations such as the United Nations, ASEAN, OLADE, the OPEC Secretariat and APEC. Following the receipt of this information, the differences between these annual data and the aggregate of the twelve corresponding MOS data are used to adjust the monthly data used in the report for the relevant year and the same adjustments are used to correct MOS data relating to the next year. Member governments submit annual oil demand data about six months after the end of the year.
A substance added to an oil product in order to improve its properties.
0 kommentar(er)
