دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a cryptocrystalline form of quartz with waxy luster.

n: the temperature at which paraffin wax begins to congeal and become cloudy.

n: a collective term for a variety of petroleum-based derivatives such as asphalts, coal tars, grease and wax, mastics, and asphalt mastics that are used to coat pipe.

n pi: 1. the parts of a hydrocarbon mixture that have the highest boiling point and the highest viscosity (such as fuel oils and waxes). 2. hexanes and heptanes in a natural gas stream.

n: d1e number indicating the amount of iodine absorbed by oils. fats. and waxes. giving a measure of the unsaturated linkages present. Generally. the higher the iodine number. the more severe the action of the oil on rubber.

n: a crude oil that is characterised by a low API gravity and a low yield of lubricating oils and that has a low pour point and a low viscosity index (compared to paraffin-base oils). It is often called asphalt-base oil, because the residue from its distillation contains asphaltic materials but little or no paraffin wax.

a deposit in the flow path that is chiefly organic in composition – typically paraffin (wax),asphaltene, tar, or other organic material.

n: a saturated aliphatic hydrocarbon having the formula CnH2n+2 (e.g., methane, CH4;ethane, C2H6). Heavier paraffin hydrocarbons (i.e., C18H38) form a wax-like substance that is called paraffin. These heavier paraffins often accumulate on the walls of tubing and other production equipment, restricting or stopping the flow of the desirable lighter paraffins.

normal or straight carbon chain alkanes with carbon chain lengths of C18+. The alkanes in this range solidify at temperatures from 80oF to over 200oF. Paraffin is amorphous but may appear to have structure in slow growth examples.

n: a solid substance resembling beeswax but composed entirely of hydrocarbons. It is obtained from the crude wax that results from the solvent dewaxing or cold pressing of light paraffin distillates. The refined product is of relatively large crystalline structure, is white and brittle, and has little taste or odour.