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crude tar

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  • Tar — is a viscous black liquid derived from the destructive distillation of organic matter. Most tar is produced from coal as a byproduct of coke production, but it can also be produced from petroleum, peat or wood.Types of tarGeneralThe word tar is… …   Wikipedia

  • tar sand — Geol. bituminous sand or sandstone from which asphalt can be obtained. [1895 1900] * * * or bituminous sand Deposit of loose sand or partially consolidated sandstone that is saturated with highly viscous bitumen. Oil recovered from tar sands,… …   Universalium

  • Crude oil —   A mixture of hydrocarbons that exists in liquid phase in natural underground reservoirs and remains liquid at atmospheric pressure after passing through surface separating facilities. Depending upon the characteristics of the crude stream, it… …   Energy terms

  • crude petroleum — Naphtha Naph tha (n[a^]f th[.a] or n[a^]p th[.a]), n. [L. naphtha, Gr. na fqa, fr.Ar. nafth, nifth.] 1. (Chem.) The complex mixture of volatile, liquid, inflammable hydrocarbons, occurring naturally, and usually called {crude petroleum}, {mineral …   The Collaborative International Dictionary of English

  • crude still — noun : a still in which crude oil is first distilled compare tar still …   Useful english dictionary

  • tar still — noun : a still in which tar or similar material is distilled: as a. : a still in which the heavy residuum from the first distillation in petroleum refining is rectified compare crude still b. : an apparatus for testing especially tars and asphalt …   Useful english dictionary

  • heavy oil and tar sand — Introduction       crude oils (crude oil) below 20° API gravity are usually considered to be heavy. The lighter conventional crudes are often waterflooded to enhance recovery. The injection of water into the reservoir helps to maintain reservoir… …   Universalium

  • Heavy crude oil — or Extra Heavy oil is any type of crude oil which does not flow easily. It is referred to as heavy because its density or specific gravity is higher than of light crude oil. Heavy crude oil has been defined as any liquid petroleum with an API… …   Wikipedia

  • La Brea Tar Pits — Fossil field in Hancock Park (formerly Rancho La Brea), Los Angeles, Calif. , U.S. It is the site of pitch springs oozing crude oil, discovered by Gaspar de Portolá s expedition in 1769. The tar pits contain the fossilized bones of Pleistocene… …   Universalium

  • wood tar — a dark viscid product obtained from wood by distillation or by slow burning without flame, used in its natural state to preserve timber, rope, etc., or subjected to further distillation to yield creosote, oils, and a final residuum, wood pitch.… …   Universalium

  • Coal tar — is a brown or black liquid of extremely high viscosity, which smells of naphthalene and aromatic hydrocarbons. Coal tar is among the by products when coal is carbonized to make coke or gasified to make coal gas. Coal tars are complex and variable …   Wikipedia

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