This research presents the first demonstration of substantial microbial degradation and depletion of naphthalene from coal tar, a multicomponent, aromatic, dense nonaqueous phase liquid (NAPL). The rates and extents of microbial degradation of naphthalene from coal tar and from a twocomponent NAPL simpler in composition than coal tar were evaluated in gently mixed, NAPL−water batch systems ...
Coal tar naphthalene oil fraction (CTNOF) is typically obtained as a byproduct of the coking process in steel production. When coal is subjected to high temperatures in the absence of air (coking), it undergoes thermal decomposition, yielding various byproducts including coal tar [].This tar can be further processed to extract different fractions, one of which is naphthalene oil [2, 3].
Coal tar is a thick dark liquid which is a byproduct of the production of coke and coal gas from coal. It is a type of has both medical and industrial uses. Medicinally it is a topical medication applied to skin to treat psoriasis and seborrheic dermatitis (dandruff). It may be used in combination with ultraviolet light therapy. Industrially it is a railroad tie preservative and ...
Most naphthalene is derived from coal tar. From the 1960s until the 1990s, significant amounts of naphthalene were also produced from heavy petroleum fractions during petroleum refining, but today petroleumderived naphthalene represents only a minor component of naphthalene production. Naphthalene is the most abundant single component of coal tar.
Naphthalene is obtained from either coal tar or petroleum distillation and is primarily used to manufacture phthalic anhydride. Let us see how naphthalene is obtained from coal tar. Step 1: coal tar is the raw material used. Step 2: Naphthalene is fractionated through a weight removing column. Step 3: crude naphthalene is obtained and then ...
(a) The slow process of conversion of dead vegetation into coal is called carbonisation. (b) Coal and petroleum are formed from the dead remains of organisms and are known as fossil fuels. (c) The black thick liquid with unpleasant smell is known as coal tar. (d) During the processing of coal to get coke, coal tar and coal gas are also obtained. (e) The process of separating the various ...
naphthalene oil of coal tar [3538]. Therefore, further explorat ions on the use of catalysts to promote LRC pyrolysis staged utilization to produce naphthalene oilrich
Coal Tar and its Distillation Processes. Coal tar, also known as crude tar, is the byproduct generated during the high temperature carbonizing of coking coal for the production of the metallurgical coke in the byproduct coke ovens. It is a black, viscous, sometimes semisolid, fluid of peculiar smell, which is condensed together with aqueous ...
HYSYS software indicates high technological flexibility of the process and the production of naphthalene from coal tar that matches the quality of the naphthalene derived from petroleum. The naphthalene content in the commercial product derived from coal tar by the proposed method is wt %. The yield of naphthalene is wt %.
Naphthalene has a distinctive, strong odor, which is often described as sweet or tarlike. Its melting point is around 80°C (176°F), and it boils at around 218°C (424°F). Synthesis and Production. Naphthalene is predominantly produced from coal tar, a byproduct of the coal gasification process.
A kind of method for preparing naphthalene at first is a Doak Tar Oil, and the boiling range of further purifying is 205～235 ℃ a coal tar distillate that obtains like this is commonly referred to naphtalene contain the such heterocycle component of naphthalene, methylnaphthalene, phenolic compound and benzothiophene, (G, people such as Gilbert, Ind, Eng, Chem, 53 ...
To trace the behavior of naphthalene in the pyrolysis of coal tar, the pyrolysis of coal tar containing 14Clabeled naphthalene was carried out at 800−950 °C for 40−50 s. It was found that naphthalene has significant pyrolysis reactivity. The distributions of the radioactivities in compounds with 3−5 rings were,, and % at 800, 900, and 950 °C for 50 s, respectively ...
High temperature coal tar (HTCT) is a coproduct of the coking process, whose objective is the production of metallurgical coke for use in the production of pig iron in blast furnaces. According to FernándezGarcía et al. (2017), HTCT is obtained with a yield of about 35 wt% in coking.
Crystallization has advantages for the production of highly purified products, such as operation at low temperatures compared to vaporliquid processes, ... Purification of naphthalene from naphthalenerich oil of coal tar distillates was explored by using the melt and solution crystallizations. The solidliquid equilibrium of naphthalene ...
Coal Tar. L. Roberts, in Encyclopedia of Toxicology (Third Edition), 2014 Background (Significance/History) 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 ...
Coal tar is a byproduct of coal that is released from various processes of the coal gas and coking process. It is semiliquid in nature with a density of to g/cm 3 and has a foul smell [].. Polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds that are lifethreatening because of their chemical structures, that consist of benzene rings bonded in a linear and ...
Naphthalene was first isolated from coal tar in 1819 by Alexander Garden; it represents about 10% of this complex mixture of aromatics. The industrial importance of naphthalene dates from the latter half of the last century, owing mainly to the ease with which it can be converted into sulfonic acids and thence also to the naphthols, for use as dyestuffs intermediates.
Naphthalene is an important component of high temperature coal tar and its content can reach more than 10%. Catalytic polycondensation of naphthalene is an effective way to prepare mesophase pitch and functional carbon materials. ... which may provide valuable hints for exploring the production process of mesophase naphthalene pitch. Declare of ...
Naphthalene was first isolated from coal tar in 1819 by Alexander Garden; it represents about 10% of this complex mixture of aromatics. The industrial importance of naphthalene dates from the latter half of the last century, owing mainly to the ease with which it can be converted into sulfonic acids and thence also to the naphthols, for use as dyestuffs intermediates.
sumer products. Coal tars are used primarily for the production of refined chemicals and coaltar products, such as creosote, coaltar pitch, and crude naphthalene and anthracene oils from the distillation of crude coal tar. Coal tar has been used as a fuel in openhearth furnaces and blast furnaces in the steel industry, as a binder and filler in
Naphthalene is produced by the following processes: 1. Recovery from coal tar. 2. From petroleum Unidak process Hydeal process Process given by faith. 1. Recovery from coal tar: The tar acidfree chemical oil is charged to the system where most of the low. boiling components,, benzene, xylene, and toluene, are removed in the lightsolvent ...
Introduction. The carbonization of coal to produce metallurgical coke in slottype recovery ovens is the main source of coal tar production, with this coal conversion process constituting the second largest application of coal. Coal tar production is not a primary process target: the main target in the process is the production of metallurgical ...
article{osti_, title = {Process and apparatus for the separation of crude benzol and naphthalene from washing oil}, author = {Ullrich, H}, abstractNote = {A process and apparatus for the regeneration of washing oil which has been spent to recover naphthalene and/or benzol from coke oven gas. The spent washing oil is stripped by steam in a bubble column arranged as an integral part of a ...
Most naphthalene is derived from coal tar. From the 1960s until the 1990s, significant amounts of naphthalene were also produced from heavy petroleum fractions during petroleum refining, but presentday production is mainly from coal tar. Approximately tons are produced annually. Naphthalene is the most abundant single component of coal tar.
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