Effect of aromatic solvents in coal liquefaction: residence-time studies

Grint, Alan; Jackson, W. Roy; Larkins, Frank P.; Louey, Michael B.; Marshall, Marc; Trewhella, Martin J.; Watkins, Ian D.

doi:10.1016/0016-2361(94)90091-4

Cited by 16 publications

(15 citation statements)

References 10 publications

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“…The PTO used in our experiments appeared to have liquefaction characteristics similar to those reported for model solvent systems. 16,26,27 Mochida et al showed similar rapid conversion for coal reacted with a solvent composed of 1,2,3,10b-tetrahydrofluoranthene. 26 Their results indicate 90% of the coal was converted in the first 2 1/2 min of hydrotreatment.…”

Section: Resultsmentioning

confidence: 97%

“…Grint et al have demonstrated that the type of polyaromatic molecule affects the amount of oil produced and the amount of hydrogen utilized in coal liquefaction. 16 In addition to a good solvent, good catalyst dispersion is needed for effective coal conversion, 17 permitting good contact of the coal and catalyst. Ways of increasing coal/ catalyst contact include increasing the surface area of the catalyst and impregnating the coal with the catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…h i b i t e d .in oil yields during the first 10 min of hydrotreatment of coal samples when anthracene and pyrene were present 16. Further analysis of the work of Mochida et al26 by McMillen et al showed increased oil yields and decreased gas yields.…”

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confidence: 97%

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An Effective Coal Liquefaction Solvent Obtained from the Vacuum Pyrolysis of Waste Rubber Tires

Orr

Shi

et al. 1996

Energy Fuels

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Oil derived from vacuum pyrolysis of waste rubber tires was used as a coal liquefaction solvent with a high-volatile A bituminous coal and a Mo catalyst. The vacuum-pyrolyzed tire oil along with the Mo catalyst was found to convert over 90% (daf) of the coal to gas, oil, and asphaltenes. Reactions were carried out in tubing reactors heated to 430 °C under 1000 psig (cold) of hydrogen gas. The vacuum-pyrolyzed tire oil (PTO) obtained from waste rubber tires contained various polyaromatic molecules which have been shown to be beneficial in coal liquefaction. Coal conversion was found to be hydrogen pressure dependent for reactions where coal and PTO were coprocessed together. Conversion results show that most of the coal reacted within the first 10 min of coprocessing. Electron probe microanalysis (EPMA) detected the presence of Mo inside coal particles after 20 min of coprocessing coal and PTO.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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An Effective Coal Liquefaction Solvent Obtained from the Vacuum Pyrolysis of Waste Rubber Tires

Orr

Shi

et al. 1996

Energy Fuels

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“…The ability of hydrogen-donor solvents to promote coal conversion has been well recognized [8][9][10][11]. Most often tetralin has been used as a hydrogen donor reagent for coal conversion [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Rejuvenation of Residue Hydroconversion Catalysts by H-donor Solvents

2008

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The spent hydroprocessing catalyst from conversion of bitumen was extracted with hydrotreated gas oil, tetralin and tetralin-pyrene as solvents at 400°C and 10 MPa hydrogen pressure in order to remove coke and rejuvennate catalyst activity. The reactive extraction of solvents partially removed the coke on catalyst with the order of effectiveness: gas oil \ tetralin \ tetralin-pyrene. Tetralin showed higher ability than the gas oil for the coke removal by donating hydrogen in situ to hydrogenate the coke. Binary tetralin/pyrene solvent mixture gave synergism for removing coke on the catalyst due to the ability of pyrene to shuttle hydrogen to form more active H-donors, hydropyrenes. HDS activity of the spent catalyst was enhanced after the coke removal.

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“…Since conversion of the coal to low boiling material is not complete, considerable material consisting of a mixture of some high boiling components, some deasher effluent and some product distillate must be recycled to the process and is used as the principal solvent (marked V131B) which is fed with fresh coal to the first stage of the process. Experience has shown that recycle of some heavy product to the reaction actually results in higher conversion to fuel grade product than if the process is carried out in a single stage batch ' process without recycle (1,2).…”

Section: Introductionmentioning

confidence: 99%