WEBOct 13, 2022 · Direct coal liquefaction converts coal into liquid fuel to produce highvalueadded oil products such as gasoline and diesel [].However, the process of direct coal liquefaction also generates a large amount of residue that accounts for approximately 30 wt% of the total coal feedstock quantity [].The coal liquefaction residue (CLR) is a .
WEBDirect coal liquefaction residue (DCLR) is, commonly, designed to be used as a feed stock for gasifiion or combustion. Use of DCLR as a value added product is very important for improving overall economy of direct coal liquefaction processes. This study shows that the DCLR may be used as a pavement asphalt modifier. The modifiion ability is similar to .
WEBThe frontend design of a direct coal liquefaction process for the conversion of lignite into coal liquids by solvent extraction was investigated. The experimental work focused on physical coal dissolution in the temperature range 25–150 °C. It was found that the kinetics of physical coal dissolution was rapid and essentially complete within 2 min at 25 °C. .
WEBFeb 1, 2024 · It was found that the chain lengths of the aliphatic hydrocarbons fractions in the Exxon donor solvent (EDS) process recycle solvent and Hcoal heavy fuel oil, derived from coals of different ranks, ranged from C 11 to C 30, regardless of the coal rank and liquefaction process.[26] Wright et al.[27] analyzed commercial creosotes as well as a ...
WEBNov 1, 2019 · The aim of this study is to investigate the transformation of hydrogendonor solvent tetralin in the direct liquefaction process of coal. Pure tetralin liquid as well as mixture of tetralin and Wucaiwan coal (WCW) were separately reacted under a liquefaction condition, and constituents of liquid product were analyzed by GCMS.
WEBJan 1, 1983 · Curran et al. (1966, 1967) were the first to describe the general mechanism of coal liquefaction as a free radical process in which coal is thermally decomposed into free radicals subsequently stabilized by abstraction of hydrogen: Free radicals are now believed to play a major role in liquefaction processes (see Neavel, 1976b). Coal has ...
WEBSep 1, 2011 · A novel liquefaction and distillation process has been proposed and designed for the typical oxygenbearing coalbed methane (CBM), in which the impurities of the oxygen and nitrogen components ...
WEBMay 1, 2000 · A coal liquefaction pilot plant of the NEDOL process, supported by the New Energy and Industrial Technology Development Organization (NEDO), was in successful operation for a total of 269 days at Kashima, liquefaction section consisted of three reactors, 1 m in diameter, connected in series, and processed 150 tons of coal .
WEBNov 1, 1981 · To determine the effects and relative importance of process variables in coal liquefaction, ... a typical coal liquefaction unit. The rvalue of Powhatan coal heated to 500 in a vacuum is , typical of re aromatic hydrocarbons and above the 0value of the free electron, suggesting that conductivity effects are not important with ...
WEBJun 1, 2017 · 1. Overview of DCL process and the behaviors of mineral matter in liquefaction. Direct coal liquefaction, which is known as DCL, refers to the process that involves direct hydrogenation of coals at relatively high temperatures and pressures [1], [2].It can be also viewed as a reductive pyrolysis process in which raw .
WEBMay 1, 2023 · 1. Introduction. Direct coal liquefaction (DCL) is one of the routes to directly convert coal to oils and chemicals [1], [2], [3].Its core reactions include the generation of radical fragments of a wide range of molecular sizes by cleavage of weak covalent bridge bonds in coal followed by hydrogenation of the radical fragments to form products, such .
WEBFeb 15, 2024 · Based on the multistage liquefaction process, asphaltene was prepared from Hongliulin coal and deeply liquefied with NiCoMo, CoMo, and Fe2 O 3 alysts. The yields of each component were obtained. Ultimate analysis, FTIR and XPS was used to investigate the conversion of oxygenic structure. The results showed that the ability to .
WEBPetroleum gas production. For producing petroleum gas, the optimal advanced oil processing ratio is 20:5:17 (advanced oil processing : heavy oil cracking : light oil cracking), and 8:2:7 is close enough. Using coal liquefaction, the ratio is 60:39:55 (coal liquefaction : heavy oil cracking : light oil cracking), and 12:8:11 is close enough.
WEBJan 1, 2015 · Recently, a new direct coal liquefaction process that uses no alyst was shown to operate at temperatures below 360 °C [6 ... In coal liquefaction, the major chemical reactions in the presence of hydrogen are hydrogenolysis of C–C, C–O, C–N, and C–S bonds, and hydrogenation of aromatic rings; these reactions convert coal to smaller ...
WEBOct 1, 1984 · Process slurries emanating from reactors generally contain 5 to 10 wt.% of solids. Solid—liquid separation processes must be used to separate the mineral residue and unconverted carbon from liquefied coal. Difficulties in removing those solid components represent a major obstacle to economic production of liquefied coal products.
WEBThe X c of coal during the liquefaction process generally increases with temperature and time, but Fig. 3 (a)(c) indies that the X c of three coals at 455 °C is lower compared to that at 440 °C. This suggests that condensation occurs during the coal liquefaction process, leading to the formation of coke.
WEBLiquefaction. Liquefaction is the process of converting solid coal into liquid fuels. The main difference between naturally occurring petroleum fuels and coal is the deficiency of hydrogen in the latter: coal contains only about half the amount found in petroleum. Therefore, conversion of coal into liquid fuels involves the addition of hydrogen.
WEBMay 1, 2022 · The pyrolysis process of the coal liquefaction residue was investigated under a neutral atmosphere of N2 at the sweep rate of 20 mL/min, in which linear heating rate was 20°C/min, 40°C/ min, 60 ...
WEBSep 3, 1991 · A process for twostage alytic hydrogenation and liquefaction of coal to produce increased yields of lowboiling hydrocarbon liquid and gas products. In the process, the particulate coal is slurried with a processderived liquid solvent and fed at temperature below about
WEBMar 1, 1993 · The work described is primarily concerned with the appliion of coal cleaning methods and solids separation methods to the Catalytic TwoStage Liquefaction (CTSL) Process. Additionally a predispersed alyst was evaluated in a thermal/alytic configuration, and an alternative nickel molybdenum alyst was evaluated for the .
WEB4 Liquefaction. Coal liquefaction is the process of making a liquid fuel from coal. The fundamental difference between coal, a solid, and liquid fuels is that the liquid fuels have a higher hydrogen:carbon ratio. Liquid fuels have lower ash contents and are easier to upgrade (, to remove unwanted impurities such as nitrogen and sulfur). ...
WEBJan 1, 2008 · Coal rank and composition are primary factors that influence liquefaction behavior (Fisher et al., 1942) and, although some of that influence may be overcome by increasing process severity or the use of alysts, these options may be counterproductive in reducing operating expenses (Alpert and Wolk, 1981).
WEBNov 20, 2020 · DOI: / Corpus ID: ; Super hard asphalt (SHA) from direct coal liquefaction process as pavement material article{Wei2020SuperHA, title={Super hard asphalt (SHA) from direct coal liquefaction process as pavement material}, author={Jianming Wei and Shengjie Zhang and Ying .
WEBA novel liquefaction and distillation process has been proposed and designed for the typical oxygenbearing coalbed methane (CBM), in which the impurities of the oxygen and nitrogen components are removed in the distillation column.
WEBNov 1, 2008 · Coal hydroliquefaction is an important process for converting coal to desired chemicals and liquids, in which a large amount of coal liquefaction residue (CLR) is formed as byproducts. On average, the yield of CLR is about 20–30 wt% in terms of the raw coal consumed in the liquefaction process.
WEBHighlights. Coal liquefaction, the conversion of coal to a cleanburning, lowsulfurcontent fuel, is a technology that can augment petroleumderived products such as gasoline and boiler fuels and help meet the requirement for large supplies of liquid fuel. Direct liquefaction produces liquids through the interaction of coal and hydrogen at ...
WEBSep 15, 2001 · The brown coal liquefaction (BCL) process is a twostage liquefaction (hydrogenation) process developed for Victorian brown coal in Australia. The BCL process has a solvent deashing step to ...
WEBFeb 1, 2006 · The coal residue from alytic liquefaction at 450 °C and 10 MPa which had lower sulfur content (%) and higher heating value ( MJ/kg) will be considered for use subsequently in a gasifiion process. Furthermore, the coal residue or char can be used in fluidized combustion, in gasifiion or for hydrogen production since such ...
WEBJan 19, 2023 · Liquefaction. Coal liquefaction is a process of converting coal into liquid fuels or petrochemicals. There are several processes to accomplish this task. The two most common are the indirect route and the direct route [58, 59].
WEBApr 1, 2021 · First, it is essential to select a specific CTL process in light of the coal properties and the production conditions. Moreover, it is reported that CTL factory loions influence the energy efficiency, emissions and cost, hence, carrying out liquefaction process in the coal mining area is suggested [68]. Additionally, water resources are ...
© DZCrusher - كل الحقوق محفوظة
