What is coal tar?

  • (noun): A tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds.

Coal Tar

Coal tar is a brown or black liquid of extremely high viscosity. 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 mixtures of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds, about 200 substances in all.

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Some articles on coal tar:

Synthetic Fuel - Processes - Direct Conversion - Pyrolysis and Carbonization Processes
... or destructive distillation, and it produces condensable coal tar, oil and water vapor, non-condensable synthetic gas, and a solid residue-char ... The condensed coal tar and oil are then further processed by hydrogenation to remove sulfur and nitrogen species, after which they are processed into fuels ... is a low-temperature carbonization process, where coal is heated at 680 °F (360 °C) to 1,380 °F (750 °C) in the absence of air ...
Pierre Jean Robiquet - Discovery of Alizarin and Various Dyes
... he called mauveine) from aniline, which in turn could be easily obtained from coal tar over the next ten years Perkin set up the first industrial model of molecules obtained through synthesis from coal ...
Coal Tar Distillers
... In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch ... These companies included British Tar Products Lancashire Tar Distillers Midland Tar Distillers Newton, Chambers Company (owners of Izal brand disinfectant) ...
Domtar - History
... substances, such as creosote derived from coal tar, to prolong lumber's useful life, supplying railway ties and pilings for wharves and foundations ... In the coal-intensive environment of the nineteenth and early twentieth centuries, there was an ever-increasing source of coal tar, and a demand for treated wood ... It was called the Dominion Tar and Chemical Company, Limited ...
Coal Liquefaction - Methods - Pyrolysis and Carbonization Processes
... conversion occurs through pyrolysis or destructive distillation, and it produces condensable coal tar, oil and water vapor, non-condensable synthetic gas, and a solid ... The coal tar and oil are then further processed by hydrotreating to remove sulfur and nitrogen species, after which they are processed into fuels ... In this low-temperature carbonization process, coal is heated at 680 °F (360 °C) to 1,380 °F (750 °C) in the absence of air ...

Famous quotes containing the words tar and/or coal:

    The mob is man voluntarily descending to the nature of the beast. Its fit hour of activity is night. Its actions are insane like its whole constitution. It persecutes a principle; it would whip a right; it would tar and feather justice, by inflicting fire and outrage upon the houses and persons of those who have these. It resembles the prank of boys, who run with fire-engines to put out the ruddy aurora streaming to the stars.
    Ralph Waldo Emerson (1803–1882)

    The discovery of Pennsylvania’s coal and iron was the deathblow to Allaire. The works were moved to Pennsylvania so hurriedly that for years pianos and the larger pieces of furniture stood in the deserted houses.
    —For the State of New Jersey, U.S. public relief program (1935-1943)