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COAL TAR

COAL TAR
COAL TAR structure
CAS No.
8007-45-2
Chemical Name:
COAL TAR
Synonyms
kc261;zetar;D03573;syntar;lavatar;Aquatar;supertah;pixalbol;Crudetar;Tar,coal
CBNumber:
CB3116616
Molecular Formula:
Formula Weight:
0
MOL File:
Mol file

COAL TAR Properties

Density 
1.18~1.23
Flash point:
13°(55°F)
form 
Liquid
color 
Dark brown
Water Solubility 
Not miscible or difficult to mix with water.
Merck 
14,2426
IARC
(Vol. 35, Sup 7) 1987, 1 (Vol. 92, 100F) 2012
EPA Substance Registry System
Coal tar (8007-45-2)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS02,GHS08
Hazard statements  H225-H350
Precautionary statements  P202-P308+P313-P201-P210-P280-P303+P361+P353-P405-P501a
Hazard Codes  T
Risk Statements  45
Safety Statements  53-45
RIDADR  UN1170
TSCA  Yes
HazardClass  3
PackingGroup  II
NFPA 704
3
1 0

COAL TAR price More Price(4)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Alfa Aesar 042488 Coal tar 8007-45-2 100ml $22.4 2021-03-22 Buy
Alfa Aesar 042488 Coal tar 8007-45-2 500ml $77.5 2021-03-22 Buy
Alfa Aesar 043671 Coal tar solution, contains 81.0-86.0% alcohol 8007-45-2 2.5L $134 2021-03-22 Buy
Alfa Aesar 043671 Coal tar solution, contains 81.0-86.0% alcohol 8007-45-2 500ml $40.4 2021-03-22 Buy

COAL TAR Chemical Properties,Uses,Production

Description

Coal tar is a complex hydrocarbon mixture produced by thermal destruction (pyrolysis) of coal, typically a dark viscous liquid or semisolid with a smoky or naphthenic odor. The composition of coal tar will be influenced by the process used for pyrolytic distillation as well as by the original composition of the coal; however all coal tars will be comprised of a variable mixture of organic compounds including benzene, toluene, xylenes, cumenes, coumarone, indene, benzofuran, naphthalene, acenaphthene, methylnaphthalenes, fluorine, phenol, cresols, pyridine, picolines, phenanthracene, carbazole, quinolines, fluoranthene, and pyrene. The number of specific chemical constituents is in the thousands. Coal tar creosotes and coal tar distillates, oily liquids generally lighter in color and of lower viscosity than coal tar, are fractions produced by additional distillation of crude coal tar. Coal tar pitch is a highly viscous dark semisolid byproduct of coal pyrolysis. Coal tar volatiles are the vapors produced from heated coal tar or coal tar pitch, containing lower molecular weight (smaller ring number) polycyclic aromatic hydrocarbons (PAHs).
Coal tar is noteworthy as one of the first – if not the first – chemical substances documented to cause cancer through occupational exposures. In the eighteenth century, Sir Percival Pott, a British surgeon, noticed a higher incidence of cancers in chimney sweeps chronically exposed to soot and coal tar. He then demonstrated excess cancers occurring in laboratory animals when coal tar is applied to the ears and skin. In the early twentieth century, polycyclic aromatic compounds isolated from coal tar were identified as chemical carcinogens.

Chemical Properties

Coal tars are by-products of the destructive distillation (carbonization) of coal to produce coke or gas. The composition and properties of a coal tar depend primarily on the temperature of the carbonization and to a lesser extent on the nature (source) of the coal used as feedstock. In general, coal tars are complex combinations of hydrocarbons, phenols, and heterocyclic oxygen, sulfur, and nitrogen compounds. Over 400 compounds have been identified in coal tars, and as many as 10,000 may actually be present. The PAH content of coal tars increases with increasing carbonization temperature. Coal tars typically are black or almost-black viscous liquids or semisolids with a characteristic naphthalene-like odor (ATSDR 2002). They are slightly soluble in water, partially soluble in acetone, carbon disulfide, chloroform, diethyl ether, ethanol, methanol, petroleum ether, and sodium hydroxide, and soluble in benzene and nitrobenzene. Lowtemperature coal tars (formed at temperatures below 700°C) are black, viscous liquids that are denser than water and contain a lower percentage (40% to 50%) of aromatic compounds than high-temperature coal tars (IARC 1985). Coal tars are highly flammable and corrosive, and toxic gases may be released when they burn. Their vapors can form explosive mixtures with air (HSDB 2009).
Coal-tar pitches are shiny, dark-brown to black residues produced during the distillation of coal tars. They contain various PAHs, their methyl and polymethyl derivatives, and heteronuclear compounds (IARC 1985).

Uses

Coal tars and coal-tar pitches have many uses in industry and in consumer products. Coal tars are used primarily for the production of refined chemicals and coal-tar products, such as creosote, coal-tar pitch, and crude naphthalene and anthracene oils from the distillation of crude coal tar. Coal tar has been used as a fuel in open-hearth furnaces and blast furnaces in the steel industry, as a binder and filler in surface-coating formulations, and as a modifier for epoxy-resin surface coatings. U.S. Pharmacopeia–grade coal tar is approved for use in denatured alcohol (IARC 1985). Coal-tar preparations have been used for many years to treat various skin conditions, such as eczema, psoriasis, seborrheic dermatitis, and dandruff. Both prescription and nonprescription preparations are available and include cleansing bars, creams, gels, lotions, ointments, shampoos, and other topical solutions and suspensions (DermNet NZ 2010). Coal tar is also registered as an active ingredient in pesticides with the U.S. Environmental Protection Agency (EPA 2003).
Coal-tar pitches are used primarily as the binder for aluminumsmelting electrodes (IARC 1984). They are also used in roofing materials, to impregnate and strengthen refractory brick (for lining industrial furnaces), and in surface coatings, such as pipe-coating enamels and black varnishes used as protective coatings for industrial steelwork and as antifouling paints for boats. Hard pitch is used as a binder for foundry cores. Coke-oven pitch is used to produce pitch coke, which is used as the carbon component of electrodes, carbon brushes, and carbon and graphite articles. Distillation fractions and residues from high-temperature coal tars are used for road paving and construction and in the production of naphthalene, recovery of benzene, production of anthracene paste, briquetting of smokeless solid fuel, impregnation of electrodes and fibers, and manufacture of electrodes and graphite (IARC 1985).

Uses

Coal tar is primarily used as a raw material in the manufacture of plastics, solvents, dyes, and in the manufacturing of other chemicals. Most coal tar undergoes further distillation. Industries that use coal tar include road paving, roofing, smelting, and coking. Coal tar creosote is used as a wood preservative. Coal tar products are also ingredients in medicine (Coal Tar United States Pharmacopeia) used to treat skin diseases such as psoriasis or eczema.

Safety Profile

A human and experimental skin irritant. A flammable liquid. When heated to SYNS: ANTHMCITE PARTICLES 0 COAL FACINGS 0 COAL, GROUND BITUMINOUS (DOq 0 COAL-MILLED 0 COAL SLAG-MILLED SEA COAL decomposition it emits acrid smoke and irritating fumes.

Carcinogenicity

Coal tars and coal-tar pitches are known to be human carcinogensbased on sufficient evidence of carcinogenicity from studies in humans.

Environmental Fate

Due to the variability in composition, it is not possible to describe all potential mechanisms of toxicity for coal tar. The reader is recommended to review additional references for individual constituents found in the Table of Contents. It is likely that acidity of some constituents, such as phenols, and the defatting potential of some hydrocarbons, contribute to the irritancy of coal tar. Phototoxicity of PAHs is likely to be a main cause of contact irritation.
The carcinogenicity of PAH constituents is believed to lie in their potential for their reactive metabolites to be bound to macromolecules such as DNA. The mechanism of therapeutic value as a topical agent in the treatment of skin diseases is unknown but is thought to involve decreased epidermal proliferation.

Toxicity evaluation

Environmental partitioning will vary dependent upon the chemical characteristic of various constituents of coal tar. Photochemical degradation may occur in the atmosphere. If entered into aquatic systems, light hydrocarbon constituents such as benzene will volatilize in the air. Biodegradation in aquatic ecosystems will occur at various rates for different constituents. Large molecules such as PAHs are likely to adsorb to soil and sediment, undergoing slow degradation. Other hydrocarbons, such as phenols, may be readily degraded under aerobic conditions.

COAL TAR Preparation Products And Raw materials

Raw materials

Preparation Products


COAL TAR Suppliers

Global( 51)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 22607 55
career henan chemical co
+86-371-86658258
sales@coreychem.com CHINA 29954 58
Hubei xin bonus chemical co. LTD
86-13657291602
027-59338440 linda@hubeijusheng.com CHINA 23035 58
Chongqing Chemdad Co., Ltd
+86-13650506873
sales@chemdad.com CHINA 37282 58
Antai Fine Chemical Technology Co.,Limited
18503026267
info@antaichem.com CHINA 9664 58
Chemwill Asia Co.,Ltd. 86-21-51086038
86-21-51861608 chemwill_asia@126.com;sales@chemwill.com;chemwill@hotmail.com;chemwill@gmail.com CHINA 23975 58
J & K SCIENTIFIC LTD. 400-666-7788 010-82848833-
86-10-82849933 jkinfo@jkchemical.com;market6@jkchemical.com China 96815 76
Alfa Aesar 400-610-6006
021-67582001/03/05 saleschina@alfa-asia.com China 30159 84
Energy Chemical 400-005-6266 021-58432009-
021-58436166 sales8178@energy-chemical.com China 43503 61
BEST-REAGENT 18981987031 400-1166-196
cdhxsj@163.com;1955352637@qq.com;cdhxsj@163.com China 11718 57

View Lastest Price from COAL TAR manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-11-08 COAL TAR
8007-45-2
US $5.00 / KG 1KG 99% 30 Tons Wuhan wingroup Pharmaceutical Co., Ltd
2019-08-08 COAL TAR
8007-45-2
US $1.00-2.00 / KG 1KG 98% 1kg,10kg,100kg career henan chemical co

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