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3 edition of Solvent Extraction of Coal by Aromatic Compounds at Atmospheric Pressure. found in the catalog.

Solvent Extraction of Coal by Aromatic Compounds at Atmospheric Pressure.

United States. Bureau of Mines.

Solvent Extraction of Coal by Aromatic Compounds at Atmospheric Pressure.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 4662
ContributionsGolumbic, C., Anderson, J., Orchin, M.
ID Numbers
Open LibraryOL21748275M

  Polycyclic aromatic hydrocarbons (PAHs) are worldwide pollutants produced mainly during incomplete combustion and pyrolysis of organic substances. PAH derivatives are components with hydrogen on the aromatic ring substituted by carbonyl-, nitro- and hydroxyl-functional groups (N-PAH, O-PAH or OH-PAH), or a group of heterocyclic PAHs containing one sulfur atom in place of a carbon . The extraction solvent comprises an amide compound, and a heterocyclic aldehyde, aromatic nitro compound or aromatic aldehyde is contained in the extraction solvent within a range of to 10 wt. % based on the weight of the extractive solvent. excessively high. After extraction, a reduction of the pressure causes the solvent molecules to move apart, the solvent capacity is lost, and the extracted material is precipitated, thus freeing the solvent for re-use. Coal extraction is normally carried out at ?C while the coal is .


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Solvent Extraction of Coal by Aromatic Compounds at Atmospheric Pressure. by United States. Bureau of Mines. Download PDF EPUB FB2

Additional Physical Format: Online version: Golumbic, C. Solvent extraction of coal by aromatic compounds at atmospheric pressure. Washington, D.C.: U.S. Dept. Most of the more recent literature on solvents and coal relates to these higher temperature coal-solvent interactions and the mechanisms of coal liquefaction at temperatures between and °C.

The extraction of coal with hydrogen donor solvents at elevated temperatures and pressures is of particular importance as a technological by:   Processes that have been studied for the separation of aromatic hydrocarbons from aliphatic hydrocarbon mixtures include: liquid extraction, suitable for the range of wt.% aromatic.

Solvent Solvent Extraction of Coal by Aromatic Compounds at Atmospheric Pressure. book of coal has had a long history.

The principal early workers in this field, Fischer 4 in Germany and Wheeler5 and H. H., Solvent Extraction oi Coal by Aromatic Compounds at Atmospheric Pressure: Bureau of Mines Rept.

of Investiga-tions, 12 pp. Close. Upcoming Pages. Here’s what’s next. 8 of 9 of 10 Cited by: 4. 1. Introduction. Low temperature coal tar, as a by-product of coal coking and gasification process, is an important source of chemicals and fuel oil due to containing many useful and valuable components are very complicated and mainly consisted of aromatic, hydrocarbons, and phenolic compounds, of which the content of phenolic compounds makes up to 20%–30% and Cited by: 4.

Chemical type is also of significance, aromatic solvents in general being better then aliphatic, as would be expected from the nature of the coal. Compounds containing oxygen and nitrogen have been shnwn tn be effective, although the latter wnuld be undesirable contaminants in further Solvent Extraction of Coal by Aromatic Compounds at Atmospheric Pressure.

book of extract. It is even possible to extract with water. Solubility in the liquid phase at. Introduction. Aroma compounds vary widely in their structures and may contribute to the overall flavour of a food at concentrations below 1 part in 10 For example, the odour threshold of bis(2-methylfuryl)disulphide in water equals 2 × 10 − 14 (Buttery et al., ); this compound is a key contributor to cooked beef aroma (Gasser and Grosch, ).

non-aromatic compounds using mixed solvents. Part I. at T = K and atmospheric pressure. The cloud point method was used to determine the solubility curves, and the tie-line compositions.

Aromatic compounds are produced from a variety of sources, including petroleum and coal tar. Poly-aromatic hydrocarbons are components of atmospheric pollution and are known carcinogens.

Aromatic compounds are also interesting because of their presumed role in the origin of life as precursors to nucleotides and amino acids. Temperature-responsive ionic liquid extraction and separation of the aromatic sulfur compounds. Fuel, DOI: / Hanee Farzana Hizaddin, Ramalingam Anantharaj, Mohd.

Ali Hashim. A quantum chemical study on the molecular interaction between. The extraction of aromatic hydrocarbons from aromatic/aliphatic mixtures was investigated using chloroaluminate ionic liquids as extractants. Three types of chloroaluminate ionic liquids, i.e., 1-butylmethylimidazolium chloride−aluminum chloride (BMIC/AlCl3), trimethylamine hydrochloride− aluminum chloride (Me3NHCl/AlCl3), and triethylamine hydrochloride−aluminum.

Assam coal was alkylated with isopropyl and n-butyl bromides and AlCl3 catalyst in CS2 and quinoline as solvents. This resulted in enhanced extraction. Studies of the extraction and coking of coal and their significance in relation to its structure by Milton Orchin Solvent extraction of coal by aromatic compounds at atmospheric pressure by C Golumbic Milton, Oxo process Science Science and state Solid state chemistry Solvent extraction Spectrum analysis Symmetry Symmetry.

Polycyclic aromatic hydrocarbons (PAHs) are major organic pollutants in the environment, which are toxic to humans and biota, given their carcinogenic, mutagenic and teratogenic nature. In this chapter, we carried out an overview of the sources and toxicity of PAHs, their common analytical methods of determination in the water and sediment samples, and also their global trend of.

Reactivity of polycyclic aromatic compounds (PACs) adsorbed on natural aerosol particles exposed to different atmospheric oxidants (O3, OH and NO2/O3 mixture) was studied.

summarized by Sehume et al In general, solvent extraction represents the treatment of coal with a solvent(s) to dissolve some components of the coal, at temperatures between and °C,12 The extensive experiments, using phenol as a solvent, for solvent extraction of coal date back to the s,14,15 This.

temperature and pressure to enable an exhaustive extraction of the target compounds with relatively short extraction time and low solvent consumption. PLE has been successfully applied to study POPs in a variety of environmental samples including soils, sediments and biota samples [15–18].

PLE has also been used to determine the amount of. THF Extraction Experiment. 25 g coal sample and ml of THF solvent were mixed and placed in the SL-SM ultrasonic processor and microwave extractor, set at 50°C, atmospheric pressure, extraction time 4 h, microwave power W, ultrasonic power W, working time 1 s, and interval 3 s.

Sample extraction and purification for determination of polycyclic aromatic hydrocarbons by reversed-phase chromatography. Analytical Chemistry52 (13), DOI: /aca A.

Langade and V. Shinde. Solvent extraction of scandium(III). @article{osti_, title = {Supercritical solvent extraction}, author = {Swanson, M L and Dollimore, J and Schobert, H H}, abstractNote = {Analysis of supercritical water extracts of Indian head lignite determined that approximately 69% of the extract was of a polar nature, 26% was aromatic and 5% was aliphatic hydrocarbons weight several identifiable compounds found in the aromatic fraction.

Egashira, M. Nagai, and C. Salim, "Separation of Nitrogen Heterocyclic Compounds Contained in Coal Tar Absorption Oil Fraction by Solvent Extraction", 6th World Congress of. is rich in aromatic compounds such as polycyclic aromatic hydrocarbons (PAHs) and believed as the polar fraction, has the N, O, S atoms, some of which substitute the carbon in the aromatic chain normally (Gargiulo et al.

Soxhlet extraction, a nondestructive separation technique, can well separate and enrich compounds with similar sol. Extraction of aromatic compounds from spices Solvent extraction Steam distillation (SD) Enfleurage, Cohobation, and Maceration compounds.

• Principle -the combined V.P equals the ambient pressure at about °C so that the volatile components with the B.P ranging from to °C can be evaporated at a temperature close to that.

Perfume (UK: / ˈ p ɜː f j uː m /, US: / p ər ˈ f j uː m /; French: parfum) is a mixture of fragrant essential oils or aroma compounds, fixatives and solvents, usually in liquid form, used to give the human body, animals, food, objects, and living-spaces an agreeable scent.

Ancient texts and archaeological excavations show the use of perfumes in some of the earliest human civilizations. A process for liquefying a particulate coal feed to produce useful petroleum-like liquid products by steps which include: (a) admixing said coal feed, a solvent, particularly a non-donor solvent, and a quinone compound, or admixture of quinone compounds, to form a coal liquid slurry, and then (b) contacting said coal liquid slurry with molecular hydrogen in a liquefaction zone at temperature.

Supercritical fluid extraction was carried out with three different solvents, i.e., toluene, toluene/2-propanol and toluene/THF mixtures, at °C and 10 MPa in an apparatus with continuous flow. burial process, heat, pressure, time, the coalification process, and several other factors, all lead to very complex coal structures.

The predominant type of structure in coal is aromatic. The formation of aromatic ring compounds follows two general pathways during the coalification of the original plant material.

One pathway forms macro. Coal tar is a liquid by-product of coal pyrolysis processes. This liquid oil mixture contains various kind of useful compounds such as benzoic aromatic compounds and phenolic compounds.

These compounds are widely used as raw material for insecticides, dyes, medicines, perfumes, coloring matters, and many others.

The coal tar was collected by pyrolysis process of coal obtained from PT. An analytical method is described for the separation, identification, and quantification of a number of polycyclic aromatic sulfur heterocycles (PASHs) in three fossil fuel-related samples including two Standard Reference Materials (SRMs), SRM (coal tar) and SRM (petroleum crude oil), and a decant oil.

The compounds measured include the 3 possible naphtho[b]thiophenes. The aim of this study is to investigate the possible use of ILs as solvents for two separation problems frequently encountered in petroleum industry: {aromatic sulfur compound + aliphatic hydrocarbon} or {nitrogen compound + aliphatic hydrocarbon}.

This work is focused on three ILs: 1-ethylmethylimidazolium thiocyanate, 1,3-dimethylimidazolium methylphosphonate, and tris-(2. USA USDA USA US A US A US A US D A USD A US DA US A US A US A Authority US United States Prior art keywords coal solvent hydrogen liquid products Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

In the step of solvent extraction, the most efficient was 1-butanol, followed by tert-butanol, 2-propanol and ethanol; for the step of adsorption, activated carbon was the most effective solid for PAH removal, confirming the similarity of these compounds with petroleum aromatic fractions.

Thus, the optimum solvent-adsorbent pair for the recovery of. This concise and modern book provides a complete overview of both solvent extraction separation techniques and the novel and unified competitive complexation/solvation theory. This novel and unified technique presented in the book provides a key for a preliminary quantitative prediction of suitable extraction systems without experimentation, thus saving researchers time and resources.

Coal pyrolysates are mainly composed of aliphatic and aromatic compounds, with varying heteroatomic content (i.e., S, O, and N) [9–12]. The hyphenation of gas chromatography (GC) with high-resolution mass spectrometry (MS) represents a method to analyze these complex mixtures in depth [ 20 ].

Christopher H Marvin, Richard W Smith, Douglas W Bryant, Brian E McCarry, Analysis of high-molecular-mass polycyclic aromatic hydrocarbons in environmental samples using liquid chromatography–atmospheric pressure chemical ionization mass spectrometry, Journal of Chromatography A, /S(99),1, (), ().

Pressure does not affect the reaction much, as most of the solvent extractions are carried out under the atmospheric pressure. Other factors may be precipitation of solids, vapor pressure, etc. Apart from these factors, residence time is also important in the reactions like metals separation or short life components like antibiotics.

Analytical Methodologies for the Control of Particle-Phase Polycyclic Aromatic Compounds from Diesel Engine Exhaust. By F. Portet-Koltalo and N. Machour. and nature of the extraction solvent, the pressure being fixed at bars. APCI Atmospheric Pressure Chemical ionisation. APPI Atmospheric Pressure PhotoIonisation.

The feed coal, in a finally divided state and substantially free of water, is extracted with a suitable solvent in an extraction zone at an elevated temperature and pressure. For the most part, the extractants are polycyclic aromatic hydrocarbons, which are maintained in the liquid state at the temperature and pressure of extraction.

The invention relates to a method for producing process oils from mineral oil refining having improved properties, wherein said method comprises extracting a bright stock extract or a bright stock extract mixture comprising a bright stock extract and one or more oils.

The process oils according to the invention can be used as plasticizers or extender oils for rubbers and rubber mixtures. Introduction. Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental contaminants that may originate from a variety of incomplete combustion and pyrolysis processes from anthropogenic and natural sources (Lee & Shim, ; Varlet et al., ).A high amount of PAHs is emitted from processing coal and during the incomplete combustion of organic matter, such as fuel.

You searched for: Author "Liu, Fang-Jing" Remove constraint Author: "Liu, Fang-Jing".Polycyclic aromatic hydrocarbons (PAHs) are formed in natural processes during combustion of biomass (e.g., forest fires) and by anthropogenic activities at high temperatures.

In according with the suggestion the major sources of PAHs in the environment. The main sources of PAHs come basically from heat and power generation (e.g., coal, gas, wood, and oil), industrial processes (e.g., coke.The extraction pressure should be above the critical pressure and may be within the range of to 10, psi and preferably within the range of to psi.

The utilisable solvent component may be hydrocarbons or organic derivatives of hydrocarbons and other organic compounds which solvent components have a critical temperature of.