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coal tar
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coal tar
The Columbia Encyclopedia, Sixth Edition
coal tar product of the destructive distillation of bituminous coal. Coal tar can be distilled into many fractions to yield a number of useful organic products, including benzene, toluene, xylene, naphthalene, anthracene, and phenanthrene. These substances, called the coal-tar crudes, form the starting point for the synthesis of numerous products—notably dyes, drugs, explosives, flavorings, perfumes, preservatives, synthetic resins, and paints and stains. The residual pitch left from the fractional distillation is used for paving, roofing, waterproofing, and insulation.
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The Columbia Encyclopedia, Sixth Edition 2008
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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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Small fluctuations of the coal tar market in 2008.(Energy)
; ...around 330 million tons in 2007. Based on a coal tar yield of 3.26%, the output of coal tar was around 10.76 million tons, an increase...over 2006. The main reasons for the growth of coal tar output were as follows. (a) The rapid growth...
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Keeping on Top of It.(coal tar roofing)(Brief Article)
; Coal tar built-up roof maintenance and repair Coal tar built-up roofing has proven superior performance for more...most commonly encountered maintenance requirements of a coal tar membrane system. Be sure to first determine the type of...
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BUR options: asphalt or coal tar? (built-up roof) (Focus on Roofing)
; ...the difference between an asphalt and a coal tar pitch built-up roof, you're probably not...may have never specified an asphalt or coal tar system, let alone evaluated their differences...is more to the old question, asphalt or coal tar? than meets the eye. At first glance...
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Basic considerations for selecting coal tar roofing systems.
; ...determine how long the plant roof lasts. Coal tar built-up roofing has been fighting these...attraction is high. The chemical composition of coal tar makes the product resistant to natural...rooftop contaminants. (The table indicates coal tar's resistance level to a variety of ...
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Supply shortage of coal tar.(MARKET REPORT: Market Pulse)
; The output has grown stably Coal tar is a byproduct in coking. The yield is...over 2005 and the output of byproduct coal tar was around 9.85 million tons, an increase...spite of some fluctuations, the pace of coal tar has presented an overall rising trend...
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Comparison of the present coal tar processing situation at home and abroad. (Market Report).
; ...processing of coke and gas, the 4% of coal tar generated in coke production has also...oil prices keep increasing. The value of coal tar in the chemical industry is becoming more...increase the value of products processed from coal tar. The output of coal tar in China ...
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The chemical advantages of coal tar.(Letters)(Letter to the Editor)
; ...to the incompatibility of asphalt and coal tar, but then explains how they have been...failed to also mention the application of coal tar sealers to asphalt pavement, the successful use of certain asphalt ply sheets with coal tar moppings, the coexistence of coal tar...
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COMING CLEAN; Denorex Drops Coal Tar, Settles Lawsuit
; American Home Products will remove coal tar, a carcinogen, from its Denorex medicated...are suing more than 20 manufacturers of coal-tar products under the state's Proposition...formulas so that they contain 0.5 percent coal tar or less. At present, nonpresciption shampoos...
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Roofing contractor: Tarshield WB: water-based coal tar roof coating.(Product Profile)
; ...for you. Tarshield WB is a water-based coal-tar roof coating that can be used on structures...thus able to provide the benefits of a coal tar system without the hazards that come with...materials. Compatible with either asphalt or coal tar membranes, Tarshield WB can be applied...
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Coal tar is driven by downstream.(SPECIAL REPORT: Organics)
; Coal tar is a by-product derived from high temperature...mainly composed of aromatic hydrocarbons. Coal tar is a valuable raw material in the production...market of coal coke chemical products with coal tar as leading product begins to form in China...
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Related entries from encyclopedias, dictionaries, and thesauruses
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coal tar
coal tar By-product from the manufacture of coke. Coal tar comes from bituminous coal used in the distillation...important for its organic chemical constituents (coal-tar crudes), which are extracted by further distillation...
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coal tar
coal tar (kohl) n. see tar .
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coal tar
coal tar • n. a thick black liquid produced by the destructive distillation of bituminous coal. It contains benzene, naphthalene, phenols, aniline, and many other organic chemicals.
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tar and pitch
...method for the production of both tar and pitch. Coal tar is a residue in the manufacture of coal gas and coke. By the application of heat, tar is separated into several materials...making of briquettes used as fuel. Coal-tar derivatives are used in the manufacture...
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tar
tar 1 / tär / • n. a dark...liquid distilled from wood or coal, consisting of a mixture of hydrocarbons...other material: [in comb. ] low-tar cigarettes. • v. ( tarred , tar·ring ) [ tr. ] [usu. as adj...tarred ) cover (something) with tar: a newly tarred road. ...
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