(PDF) An Overview of Coal Hydrogenation ResearchGate
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 ...
process of naphthalene production from coal tar
PDF CHARACTERISTICS PRODUCTION OF COAL TAR ResearchGate
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 ...
Pure naphthalene isolation by liquid extraction
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.
Critical assessment of thermodynamic properties of ... ScienceDirect
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 ...
Study on In Situ Catalytic Cracking of Coal Tar by Plasma Preparation ...
1. Introduction. With the development of coal utilization technologies such as gasification, liquefaction, carbonization, and coking, a large number of coal tar or coal tar byproducts have been produced, among which carbonization and liquefaction are the processes with coal tar as the main product. 1,2 Although medium and lowtemperature coal tars have higher contents of aliphatic ...
The use of solvents for purifying industrial naphthalene from coal tar ...
The organic chemistry industry is based on organic compounds derived from coal, petroleum and gas. Coal tars derived from the carbonisation process are complex mixtures, of which the polycyclic aromatic hydrocarbons (PAH's) are the main component. One of the most important PAH's is naphthalene, which represents between 10 to 12% of the recent years, new applications for industrial ...
Coal Tar Suppliers in India | IBMD | Tata Steel
Naphthalene produced during the distillation of coal tar is crude in nature. Crude Naphthalene is used in the production of tanning agents, household 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 ...
Coal Tar an overview | ScienceDirect Topics
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 ...
Method for extracting industrial naphthalene from coal tar
The invention discloses a method for extracting industrial naphthalene from coal tar, and belongs to the field of coal chemical industry. According to the method, coal tar is taken as a raw material; naphthalene is fractionated through a weightremoving column; firstly crude naphthalene is obtained; and then industrial naphthalene is prepared through a crude naphthalene rectifying column.
Process Intensification for Syngas Hydrogen |
The Process Intensification for Syngas Hydrogen key technology area addresses control of chemical reactions in increasingly modular and intrinsically efficient reactors, allowing for streamlined processes with wellcoordinated unit operations, and with a focus on gasification of biomass and carbonaceous wastes into syngas, s.
Naphthalene Wikipedia
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.
Products of Coal: Coke, Coal Tar and Coal Gas GeeksforGeeks
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 ...
Separation of Coal Tar into Fractions using Distillation ... Springer
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.
Naphthalene
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 — production and uses | SpringerLink
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 | Formula, Properties Application
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.
PDF 5. Production, Import/Export, Use, and Disposal
PRODUCTION Naphthalene may be produced from either coal tar or petroleum. Distillation and fractionation of coal tar is the most common production process. The middle fraction (containing most of the naphthalene) is cooled, crystallizing the naphthalene. The crude naphthalene may be refined by distillation, washing, and
Process for the production of naphthalene Google Patents
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 ...
Hydrorefining of coaltar naphthalene (Journal Article)
These advantages of the hydrorefining process have attracted the attention of numerous investigators. A laboratory study has been made of the effects of temperature, partial hydrogen pressure, and space velocity on the amounts of thionapthen and tetralin in the hydroraffinate made by the catalytic hydrorefining of coaltar naphthalene.
Purification of Naphthalene from Coal Tar Distillate by Solution and ...
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 ...
Biodegradation of Naphthalene from Coal Tar and Heptamethylnonane in ...
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 ...
Tar Production an overview | ScienceDirect Topics
The tar production rate is kg/s and is analyzed to contain 85% carbon and 15% hydrogen by weight. The heating value of the tar is 42,000 kJ/kg. The oxygen is produced from air using an oxygenseparation unit that consumes 4000 kJ of energy/kg of the oxygen produced (assume full conversion of char).
Valueadded utilization of hightemperature coal tar: A review
naphthalene oil. NPCs. normalphase columns. OBSG. octyl bonded silica gel. OCAs. ... while the latter is a byproduct from coal coking process [1]. The output of coal tar accounts for 35% of coals in the furnace [2]. ... Li YC, Xin WL, Huang MG, et al. Industrial production technology of coal series needle coke. CN A, ...
PDF 9 Naphthalene production and uses Springer
Naphthalene production and uses 299 Naphthalene recovery Coal tar is the traditional feedstock for the recovery of naphthalene. The introduc tion of new cracking processes in the last decades has given rise to the availability of petroleumbased raw materials. In addition to coalderived naphthalene, petro
PDF Naphthalene Production by Rectification of the Naphthalene ... Springer
% of the naphthalene in the coal tar; % of the naphthalene fraction is lost with the press runoff. 3. The market is limited because of the minimum product range: only liquid naphthalene can be shipped to the customer. (In April 2012, Rostekhnadzor banned the shipment of pressed naphthalene in railroad cars for lack of mechanization.
Selective production of naphthalene from methanol by ... ScienceDirect
Naphthalene is the simplest polycyclic aromatic hydrocarbon, and can be used as a precursor to many other complex aromatics. Current industrial processes remove it from coal tar or petroleum during the refining and distillation steps. The process reported here is much greener, albeit on a much smaller scale.
PDF Production of Commercial Naphthalene by CoalTar Processing Springer
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 %.
Process for the production of naphthalene Google Patents
Naphthalene, acenaphthene and luorene are wellknown organic chemicals that are useful as intermediates in the production of organic acids, dyes and insecticides. Previously acenaphthene and iluorene have been recovered from coal tar distillates or prepared by synthetic methods.
Tar steam reforming during biomass gasification: kinetic model and ...
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 ...
(PDF) Directional preparation of naphthalene oilrich tar from Beisu ...
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
Summary Of Emissions Associated With Sources Of Naphthalene US EPA
In the oxidation process, coal tar naphthalene and/or oxylene is vaporized, mixed with air and fed to the reactors. ... SUMMARY OF NAPHTHALENE EMISSIONS FROM ALL SOURCES Emission Source Coke byproduct recovery Naphthalene production Coal tar Petroleum Naphthalene end uses Inadvertent sources* Total All Sources Source Process 6. ...
Naphthalene Production | PDF | Petroleum | Hydrocarbons Scribd
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 ...
Coal Tar Creosote an overview | ScienceDirect Topics
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 ...
Leaching of Polycyclic Aromatic Hydrocarbons from the Coal Tar in ...
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 ...
Coal Tar and its Distillation Processes IspatGuru
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 ...
دریافت اطلاعات بیشتر
Emily Davis
+(86) 188 3807 2829
© DZCrusher - كل الحقوق محفوظة