Waste oils used as solvents for different ranks of coal

Orr, E.C.; Shi, Yanlong; Shao, Lian; Liang, Jing; Ding, Weibing; Anderson, Larry B.; Eyring, Edward M.

doi:10.1016/s0378-3820(96)01045-4

Cited by 21 publications

(12 citation statements)

References 11 publications

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“…Hydrogenolysis by Hydropolyaromatics. The explanation given in certain papers for the synergetic effect of rubber over coprocessing comes from the highly aromatic species present in the liquids. , It was supposed that in a two-stage coprocessing (first, rubber processing to obtain the liquids and, second, coal−rubber liquids coprocessing) the synergetic effect detected could come from the coal structure cleavage by a hydrogenolysis mechanism induced by the hydroaromatics present. , This idea is based on previous results on coal hydrogenation with solvents such as pyrene, which were added to coal in a 2 or 3 times ratio over coal weight . Meanwhile, in a coprocessing experiment with rubber liquids, these hydroaromatics are quantified by mass spectrometry in 2−3 wt % over the total liquid .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Synergy in Tire Rubber−Coal Coprocessing

Mastral

Mayoral

Murillo

et al. 1998

Ind. Eng. Chem. Res.

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The tire rubber−coal synergy is evaluated through the different roles that rubber can have in coprocessing systems. For that, two different experimental designs were used: a swept fixed-bed reactor and tubing bomb minireactors. In this way, coal was coprocessed with rubber liquids from rubber pyrolysis and rubber hydrogenation, in a hydrogen atmosphere at 400 °C. Coal was mixed as well with rubber in different proportions and hydrogenated at 375, 400, and 425 °C, and oils obtained were characterized by thin-layer chromatography to obtain hydrocarbon type composition. Rubber behavior was compared to each of the main components of tires, and all the results indicated that the slight synergy found can be due to the small free radicals from vulcanized rubber decomposition, which are able to stabilize coal radicals to light products.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Synergy in Tire Rubber−Coal Coprocessing

Mastral

Mayoral

Murillo

et al. 1998

Ind. Eng. Chem. Res.

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“…In the coprocessing of coal with an automobile crankcase, it was observed that coal acted as a trap for the metals. 6 Another approach in coprocessing studies is the investigation of waste oils as a coal liquefaction solvent. Utilizing waste oil as coal liquefaction solvent is beneficial to liquefaction chemistry.…”

Section: Introductionmentioning

confidence: 99%

“…Utilizing waste oil as coal liquefaction solvent is beneficial to liquefaction chemistry. 7 Orr et al 6 liquefied different types of coal with different waste oils and they obtained reasonable conversions. Lazaro et al 8 studied the copyrolysis of a lube oil waste and coal.…”

Section: Introductionmentioning

confidence: 99%

Utilization of red mud as catalyst in conversion of waste oil and waste plastics to fuel

Çakıcı

Yanık

Uçar

et al. 2004

Journal of Material Cycles and Waste Management

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The aim of this study was to investigate the possibilities of using a by-product (red mud) from alumina production as a catalyst for recovery of waste. The conversion of waste mineral oil (WMO) and waste mineral oil/municipal waste plastic (WMO/MWP) blends over red mud (RM), a commercial hydrocracking catalyst (silica-alumina), and a commercial hydrotreating catalyst (Ni-Mo/alumina) to fuel has been studied. The effect of the catalyst and the temperature on the product distribution (gas, liquid, and wax) and the properties of liquid products were investigated. In the case of hydrotreatment of WMO, the liquids obtained over RM at both 400°and 425°C had larger amounts of lowboiling hydrocarbons than that of thermal or catalytic treatment with hydrotreating catalyst. Gas chromatography and nuclear magnetic resonance analysis of the liquid products showed that RM had hydrogenation and cracking activity in hydrotreatment of WMO. In coprocessing of WMO with municipal waste plastics, temperature had an important effect as well as the amount of MWP in the blend and the catalyst type. The hydrocracking at 400°C produced no liquid product. In hydrocracking at 425°C, the product distribution varied with catalyst type and MWP amount. The commercial hydrocracking catalyst had more cracking ability in the conversion of WMO/MWP to liquid and gas fuel than RM. In the case of hydrocracking over RM, the largest amount of liquid having satisfactory quality was obtained only from the blend containing 20% MWP.

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“…The two most used approaches to improve coal conversion are the addition of hydrogen donor solvents to enhance hydrogen spillover and mass transport and the use of supported or unsupported (Mo, Fe, Co, or Ni based) catalysts (Derbyshire and Hager, 1994). Another possibility could be to add wastes which are rich in hydrogen, such us plastics (Taighei et al, 1994;Ding et al, 1996;Orr et al, 1996;Harrison and Ross, 1996) or old tires (Farcasiu and Smith, 1992;Liu et al, 1994Liu et al, , 1995Mastral et al, 1996). This way conversions could be improved due to the interactions between radicals involved in the coal-rubber hydrocoprocessing (Ibrahim and Sheehra, 1995), hydrogen donation, or the simple reduction of heat and mass transport phenomena, and economical costs could be lower.…”

Section: Introductionmentioning

confidence: 99%

Hydrocoprocessing of Scrap Automotive Tires and Coal. Analysis of Oils from Autoclave Coprocessing

Anderson

Callén

Ding

et al. 1997

Ind. Eng. Chem. Res.

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Hydrocoprocessing of scrap automotive tires and a low-rank coal was carried out in a magnetically stirred autoclave. Reaction temperature (400 °C) and time (30 min) were kept constant in every experiment, while different pressures (10, 5, and 1 MPa of H 2 and 0.1 MPa of N 2 ) were studied. An iron-based catalyst was used to improve yields. Derived oils were analyzed by GC-MS and TLC-FID. In terms of yields, it is shown that there is a synergism between these two materials, although it can only be observed working at low hydrogen pressure. The oils obtained in the coprocessing showed a more aromatic nature than those obtained when both materials are processed alone, and higher boiling points, suggesting that radicals from rubber and coal react between each other instead of reacting with hydrogen radicals.

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Waste oils used as solvents for different ranks of coal

Cited by 21 publications

References 11 publications

Evaluation of Synergy in Tire Rubber−Coal Coprocessing

Evaluation of Synergy in Tire Rubber−Coal Coprocessing

Utilization of red mud as catalyst in conversion of waste oil and waste plastics to fuel

Hydrocoprocessing of Scrap Automotive Tires and Coal. Analysis of Oils from Autoclave Coprocessing

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