Coal tar is an important raw material for the production of valuable aromatic compounds [].It has more than 500 components, most of which are aromatic hydrocarbons, including benzene, toluene, xylene, anthracene, naphthalene, and phenanthrene [4, 5].These are precursors for the synthesis of products such as dyes, drugs, explosives, scents, preservatives, synthetic tars, paints, and pigments.
A ≥ 200 °C fraction (CT200F) of lowtemperature coal tar was prepared by a rotary film evaporator. The catalytic conversion experiments of CT200F and six model compounds were conducted on the ...
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.
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 ...
Abstract In this study, the steam reforming of naphthalene and pyrene as heavy tar model compounds was investigated experimentally in a horizontal tube reactor and theoretically using the CHEMKIN simulation. The experimental results revealed that the reactivity of naphthalene was higher than that of pyrene in the presence of steam. The carbon content converted to soot is a little more than ...
The gasification process was started by igniting a coal seam using a pyrotechnic charge. The ignition occurred with low oxygen flow rate (2 Nm 3 /h) supplied into the reactor inlet. After ignition of the coal, the oxygen flow rate was increased to 10 Nm 3 /h. The process initiation was considered complete when the concentration of oxygen in the process gas was below 1%.
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 ...
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
The presentday process for fractionating coal tar primarily used in industry is continuous distillation. from the coal tar. When coal tar is received, it contains from 3% to 10% water. storage tank through a series of heat exchangers to increase the temperature from about 175OF to about 40OOF. The primary heat source . is . supplied by the
(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 ...
In a process for obtaining substantially sulfur free pure naphthalene from bituminous coal tar and thionaphthene as a byproduct, a dephenolized thionaphthenecontaining naphthalene fraction from oxidative purification is extracted with concentrated sulfuric acid and acetic acid anhydride in benzene.
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 %.
100 samples of recycle solvent were obtained by continuous operation (50 days) of 1 ton/day coal liquefaction plant at Kimitu. Naphthalene derivatives in the recycle solvents were anslyzed in ...
Coal tar ( ) and coal tar pitch ( ) are the byproducts of the hightemperature treatment of coal to make coke or natural gas. These chemical products usually are thick, black or dark brown liquids or semisolids with a naphthalenelike odor. Coal tar also has a sharp, burning taste.
At the moment, most of the aluminum smelters utilize coal tar pitch as binder in their prebaked carbon anode (and graphitized carbon cathode) production processes. Hence, the prediction of the thermodynamic properties of PAHs present in coal tar pitch aimed at phase behavior description of coal tar pitch during heat treatment will be the main ...
This report proffers the detailed cost evaluation of the production of naphthalene from coal tar. In this process, the coal tar is subjected to the distillation and fractionation process. Further, the middle fractions, which contain most of the naphthalene, are cooled and crystalized to yield crude naphthalene. Lastly, the crude naphthalene is ...
It is a thin, colourless, highly flammable liquid with a characteristic smell. It is a good motor fuel solvent as well as being a feedstock for other benzene derivatives used in dye, insecticides and plastics production. At a later stage in the distillation process, a heavy coal tar solvent naphtha and a naphthalene fraction are produced.
Chemical Abstracts Service Registry Number: CAS (Coal tar creosote); CAS (Wood creosote). Synonyms: Coal tar oil; Brick oil; Heavy oil; Naphthalene oil; Liquid pitch; Wood creosote. Chemical/Pharmaceutical/Other Class: Phenolic Compound. Chemical Formula: A distillate of coal that contains an estimated 162 different compounds.. Estimated makeup is as follows: aliphatic ...
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
But because that its relative density is higher than and asphaltene content is close to 50% [6] (mass fraction), hightemperature coal tar is not suitable for the production of aerospace fuel. Medium and low temperature coal tar is a liquid product with high condensation degree obtained by pyrolysis of lowrank coal at 600 to 800°C.
But nowadays Bitumen has replaced coal tar to serve this purpose. Naphthalene balls used as moth repellent in the storage areas are the derivatives of coal tar. ... The production process is distinct, both physically and chemically, from that used to create a range of gaseous fuels known variously as manufactured gas, syngas, hygas, Dowson gas ...
Naphthalene produced during the distillation of coal tar is crude in nature. Crude Naphthalene is used in the production of tanning agents, disinfectants etc. It undergoes further fractional distillation to produce some downstream products like sulphonated naphthalene (SNF) and Poly Carboxylate Ether (PCE). PCE is used as a ...
Naphthalene Production from coal tar; The distillation and fractionation techniques are used in this process. Crude naphthalene is produced by cooling and crystallizing the middle portions, which contain the majority of the naphthalene. In order to produce refined naphthalene, the crude product is then placed into a distillation, washing, and ...
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 ...
The company derives naphthalene from coal tar at production plants in North America, Europe, Australia, and China. NIPPON STEEL SUMITOMO METAL CORPORATION.
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.
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 ...
Coal tar is a hazardous and toxic waste, a byproduct of coal gasification processes. Coal tar is a waste produced in industrial fields such as steel, power plant, and the cement industry. As a ...
Odour: Peculiar, naphthalenelike (Singh, Goyal and Kaur, 2015) ... PROCESS DESCRIPTION Coal Tar ... 2019. Coal Tar Production Processes and Potential of PAHs Release into the Environment. [online ...
Report No. COAL TAR CHEMICALS JAMES J. L. MA December 1976 A private report by the a PROCESS ECONOMICS PROGRAM STANFORD RESEARCH INSTITUTE MENLO PARK, CALIFORNIA
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.
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 ...
© DZCrusher - كل الحقوق محفوظة
