Pech, Kohlenteer, Hochtemperatur Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
SCHWARZE BIS BRAUNE PASTE.
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen über 400°C unter Bildung giftiger Rauche. Reagiert mit starken Oxidationsmitteln.
ARBEITSPLATZGRENZWERTE
TLV: (als benzoll?sliches Aerosol für flüchtiges Kohlenteerpech) 0.2 mg/m?(als TWA) Krebskategorie A1(best?tigte krebserzeugende Wirkung beim Menschen); (ACGIH 2005).
AUFNAHMEWEGE
Aufnahme in den K?rper durch Inhalation und über die Haut und durch Verschlucken.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachl?ssigbar; eine gesundheitssch?dliche Partikelkonzentration in der Luft kann jedoch beim Dispergieren und Erhitzen schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Die Substanz reizt die Augen, die Haut und die Atemwege.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Wiederholter oder andauernder Hautkontakt kann Dermatitis und Hyperpigmentation der Haut hervorrufen. Krebserzeugend für den Menschen.
LECKAGE
Verschüttetes Material in abdichtbaren Beh?ltern sammeln. Reste sorgf?ltig sammeln. An sicheren Ort bringen. NICHT in die Umwelt gelangen lassen. Pers?nliche Schutzausrüstung: Atemschutzger?t, A/P2-Filter für organische D?mpfe und sch?dlichen Staub.
Chemische Eigenschaften
The term “coal tar products,” as used by NIOSH, includes coal tar and two of the fractionation products of coal tar, creosote and coal tar pitch, derived from the carbonization of bituminous coal. Coal tar, coal tar pitch, and creosote (coal tar creosote 8001-58-9) derived from bituminous coal often contain identifiable components which by themselves are carcinogenic, such as benzo(a) pyrene, benzanthracene, chrysene, and phenanthrene. Other chemicals from coal tar products, such as anthracene, carbazole, fluoranthene, and pyrene may also cause cancer,but these causal relationships have not been adequately documented. Also, the research chemical methylcholanthrene (CAS: 56-49-5), a powerful carcinogen, fits this category. Coal tar pitch is a black viscous liquid. Aromatic solvent odor. Boiling point =>260°C; specific gravity (H2O:1) = 1.07-108; freezing/melting point = 250-°180C;flash point = 207°C (coal tar pitch); 74C (creosote oil);autoignition temperature =>510°C. Insoluble in water.Coal tar creosote (8001-58-9, crosote) is an black oily,tar-like substance. Pungent odor
Verwenden
Coal tar pitch is used as a base for paints and coatings, as a
binder for carbon electrodes, for impregnating fiber pipe, in
briquetting coal, in foundry core compounds, as a plasticizer
for elastomers and polymers, as extenders, saturants, impregnants,
and sealants, and in paving and roofing. Occupations
with potential exposures to coal tar, coal tar pitch.
Definition
coal tar: A tar obtained from the destructivedistillation of coal. Formerly,coal tar was obtained as a byproductin manufacturing coal gas.Now it is produced in making cokefor steel making. The crude tar containsa large number of organiccompounds, such as benzene, naphthalene,methylbenzene, phenols,etc., which can be obtained by distillation.The residue is pitch. At onetime coal tar was the major source oforganic chemicals, most of which arenow derived from petroleum andnatural gas.
Hazard
A human carcinogen. Toxic by inhalation.
Combustible.
Health Hazard
Epidemiological evidence suggests
that workers intimately exposed to the
products of combustion or distillation of bituminous
coal are at increased risk of cancer at
many sites, including lungs, kidney, and skin.
The chemical composition and particle
size distribution of coal tar pitch volatiles
(CTPV) from different sources are significant
variables in determining toxicity.
Sicherheitsprofil
Confirmed carcinogen
with experimental carcinogenic and
neoplastigenic data by skin contact. When
heated to decomposition it emits acrid
smoke and fumes.
m?gliche Exposition
The coke-oven plant is the principal source of coal tar. The hot gases and vapors produced during the conversion of coal to coke are collected by means of a scrubber, which condenses the effluent into ammonia, water, crude tar, and other by-products. Crude tar is separated from the remainder of the condensate for refining and may undergo further processing. Employees may be exposed to pitch and creosote in metal and foundry operations; when installing electrical equipment; in construction, railway, utility; and briquette manufacturing.
Carcinogenicity
The history of coal tar cancers begins with the observations of scrotal cancer in London chimney sweeps by Percivall Pott in 1777. Since that time, a large body of evidence has accumulated demonstrating that workers involved in carbonizing bituminous coal, those handling certain by-products, or those exposed by inhalation of coal tar pitch volatiles are at excess risk of scrotal and other forms of skin, respiratory, and other types of cancer. Coal tar contains many substances that can cause cancer and is a human carcinogen. The toxicity of coal tar may vary with its origin.
Versand/Shipping
UN1136 Coal tar distillates, flammable, Hazard Class: 3; Labels: 3-Flammable liquid
Inkompatibilit?ten
Incompatible with strong oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Phenols, such as creosote react as weak organic acids. Phenols and cresols are much weaker as acids than common carboxylic acids (phenol has pKa = 9.88). These materials are incompatible with strong reducing agents such as hydrides, nitrides, alkali metals, and sulfides. Flammable hydrogen gas is often generated, and the heat of the reaction may ignite the gas. Heat is also generated by the acid-base reaction between phenols and bases. Such heating may initiate polymerization of the organic compound. Phenols are sulfonated very readily (e.g., by concentrated sulfuric acid at room temperature). The reactions generate heat. Phenols are also nitrated very rapidly, even by dilute nitric acid
Waste disposal
Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.
Pech, Kohlenteer, Hochtemperatur Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
