Tar and asphalt

Tar is a dark-colored viscous fluid that results from the decomposition of wood, coal, or petroleum. It is produced commercially, usually as a product of the processing of coal into coke. 

Asphalt is a natural dark-colored solid made of complex hydrocarbons. This material occurs in solid form, sometimes called asphaltum or gilsonite, or in liquid form when heated. The latter may form pools at the ground surface, like those at La Brea in Los Angeles, California. Asphalt is most often found at or near the Earth s surface, the result of the natural break-down of petroleum. It is sometimes concentrated in porous rock. 

Historically, asphalt has been mined for use as mortar for building and paving stones, as a water-proof road surface and lining for ditches and ponds, and as calking for ships. Both asphalt and tar have been used to seal or calk boat hulls, shingles, and fabric. In medicine, they have been used to seal wounds and as a disinfectant. Tar is used to flavor candy and as an ingredient in dandruff shampoo and cosmetics. 

Creosote is the common name applied to variety of products, including coal tar, coal tar pitch, wood creosote, and coal tar creosote. These materials are created by the high temperature treatment of hardwoods or coal, or from the sap of the creosote bush (Larrea tridentata). Some of these compounds are used medicinally, as disinfectants or laxatives, and to treat skin diseases. They are also used as coatings to prevent the decomposition of wood, as insecticides, and fungicides. 

Many plants produce compounds that can be used to stain or dye other materials. These coloring agents may come from bark, root, flower, fruit, seed, or the entire plant. Lichens, algae, and fungus have also been used to produce dyes. The hue and quality of the colors produced may be consistent for a 

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Petroleum chemistry is concerned with the origin, composition, and properties of naturally occurring petroleum deposits, whether in liquid (crude oil or petroleum), gaseous (natural gas), or solid (tars and asphalts) form. All of them are essentially mixtures of hydrocarbons. Whereas natural gas contains a few lighter hydrocarbons, both crude oil and tar deposits may consist of a large number of different hydrocarbons that cannot be easily identified for molecular structure or analyzed for composition. 

Recent trends in protective coatings used on buried pipelines have been away from reinforced hot applied coal tar and asphalt enamels and butyl rubber laminate tapes, particularly where applied over-the-ditch . The more recently developed coatings based on fusion bonded epoxies, extruded poly-ethylenes, liquid-applied epoxies and polyurethanes, require factory application where superior levels of pipe preparation and quality control of the application process can be achieved. 

Source Evaporation and/or dissolution of gasoline, naphtha, coal tar, and asphalt. 

Tars and Asphalts. These solid and semisolid substances are also known as bitumens, waxes, resins, and pitch. They are very complex substances and relatively little is known regarding their chemical composition. There is little doubt that these materials were foamed... 

Petroleum depoeite are naturally occurring mixtures of organic compounds found within, the strata of the earth. Those that occur in the gaseous state are generally referred to as natural gas whereas those occurring as liquids are kndSi. as petroleum oil or crude oil. Solid deposits are known as tars and asphalts, but, smce many of these are actually semisolids or plastic solids, they should be classified as such. 

P8 Tar and asphalt 950-1400 Asphalt, road oil, roofing materials, and protective coating... 

Tar and asphalt mixtures for paving, not made in petroleum refineries... 

BExM. [Exxon/Tomah] Cationic modifier for use in colloidal bituminous emulsions, esp. coal tar and asphalt emulsions. 

Uses Surfactant additive, rTKrdifier for day-stabilized coal tar and asphalt emulsions (improves adhesion, wear resist., water resist., and speeds dry time of coal tar coatings)... 

The solid alkanes from C20H42 onward are wax, tar, and asphaltic bitumen. Bitumen is used for the construction of asphalt roads. One of the uses of waxes, such as C23H48, C25H52, and C27H56, in nature is ecological. These waxes are produced by the female bees and used as pheromones (sex attractants) to attract male bees. The orchid (called the spider orchid) also produces this mixture of waxes, attracts the male bees, and makes the bees its agent of pollination. All these materials have immense importance to our well-being and, of course, to the female bees and the orchid ... 

Concentrated Aquatic Animal Production 451 Paving and Roofing Materials (Tars and Asphalt) 443... 

Modifier for clay stabilized coal tar and asphalt emulsions... 

The paper is recycled, as are the remaining dyes, which are turned into tar and asphalt. There are no harmful byproducts and a significant reduction in energy and cost as no screens, boilers, dryers or chemicals are needed. 

Ribbon screws are used for wet and sticky materials, such as molasses, hot tar, and asphalt. This type of screw prevents the materials from building up and altering the natural firequency of the screw. A buildup can cause resonance problems and possibly catastrophic failure of the unit. 

F4 Tar and asphaltic deposits Solvents followed by alkaline detergents... 

Bituminous Derived (totally or in part) Irom distillation of crude oil or coal coal tar and asphaltic materials ate relatively inexpensive used for waterproofing, protecting buried structures, and lining tanks poor resistance to sunlight. 

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