Recycle oils from fluid coking of coal liquefaction bottoms

Winschel, R.A.; Burke, F.P.

doi:10.1021/ef00016a002

Cited by 6 publications

(15 citation statements)

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“…If these tars were to be hydrogenated, however, the product SQI could be increased. [13] The results indicated that the SQI can be improved by using a lower temperature thermal process. The Centre for Applied Energy Research (CAER) did characterisation studies on fluid coker products to evaluate their potential as recyclable oil.…”

Section: Gasificationmentioning

confidence: 97%

“…An average recycle SQI is between 70 and 85 [13] ; however, the coker tar produced at 538 • C had an SQI lower than 70. For example, tar produced at 649 • C was essentially a nondonor solvent.…”

Section: Gasificationmentioning

confidence: 98%

“…An average recycle SQI is between 70 and 85 [13] ; however, the coker tar produced at 538 • C had an SQI lower than 70. [13,32] In the Lummus work, hydrotreatment of residue coker feed increased the tar SQI from 51.7 to 85.9. Lemberton et al [31] found that tars produced at higher temperatures are more resistant to hydrotreating than those produced at lower temperatures.…”

Section: Gasificationmentioning

confidence: 98%

“…[4,11] Cui et al [7] also examined the relationship between liquefaction conditions and the properties of residues and found that liquefaction temperature and time are main factors that control residue properties. The study found that the pyrolysis liquid yields were insensitive to temperature over the range of 426-648 • C. Winschel and Burke [13] characterised coker tars produced from a fluid coker for use as liquefaction recycle oil. The properties of the vacuum tower bottoms and the CSD residue stream obtained from critical solvent deashing stage are reported for Run 250D.…”

Section: Residuesmentioning

confidence: 99%

“…This approach was investigated by Winschel and Burke [13] who studied fluid-coker tars produced from coal liquefaction vacuum bottoms (by Lummus-Crest, Inc.<p> Please provide the city, state (USA) and country names for the manufacturer.<p>) for possible use as recycle oil. The coker tars obtained were characterised for product quality and evaluated as a possible donor solvent for the DCL process.…”

Section: Gasificationmentioning

confidence: 99%

See 4 more Smart Citations

An overview of conversion of residues from coal liquefaction processes

Khare

Dell’Amico

2013

Can J Chem Eng

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Direct coal liquefaction (DCL) is a process for converting coal to synthetic oils, which can be refined to make transportation fuels. Residue from this process contains inorganic material such as mineral matter originating from the coal and catalysts, and organic matter such as unconverted coal, heavy oils, pre-asphaltenes and asphaltenes. The conversion of these DCL residues to lighter, high-value products is an important step in helping to make this technology both commercially viable and environmentally acceptable. This paper provides an overview of the physico-chemical characteristics and processing options available for coal liquefaction residues and compares and contrasts them to those of petroleum residues. Residue properties vary considerably, since they are highly dependent on feed coal, process configuration and operating conditions. Determination of composition and structural parameters of products derived from residue conversion can help determine their stability, coking and solvent hydrogen donating ability. Thermal conversion processes such as visbreaking and gasification offer the greatest promise for handling these heavy materials. The conversion chemistry, reactivity and kinetics of residue gasification are not well-understood but are important in optimising hydrogen production for the process. The literature has been comprehensively reviewed to provide characteristics and properties of residues and their potential for conversion. In addition, the potential for producing high-value carbon products from residues is briefly discussed.

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Section: Gasificationmentioning

confidence: 97%

Section: Gasificationmentioning

confidence: 98%

Section: Gasificationmentioning

confidence: 98%

Section: Residuesmentioning

confidence: 99%

Section: Gasificationmentioning

confidence: 99%

See 3 more Smart Citations

An overview of conversion of residues from coal liquefaction processes

Khare

Dell’Amico

2013

Can J Chem Eng

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An overview of solid–liquid separation of residues from coal liquefaction processes

Khare

Dell’Amico

2012

Can J Chem Eng

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Direct coal liquefaction process typically produces mixed oils (60%) and gases (15%). The remainder is a high-boiling viscous residue that contains oils, asphaltenes, unreacted coal, mineral matter and potentially valuable liquefaction catalyst. Effective separation of the components of the residue stream is important to the economic and environmental performance of the process. Solid-liquid separation technologies, such as filtration, hydrocyclones, centrifugation, critical solvent deashing and distillation have been reviewed in relation to their use in coal liquefaction processes. Individual operations used have not been completely satisfactory, and a better overall result is obtained when they are used in combination.

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Analysis of Small Molecular Phase in Coal Involved in Pyrolysis and Solvent Extraction by PGC

Feng

Xie

2004

Energy Fuels

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The small molecular phase, which strongly affects coal's reactivity, is the main part of the structure unit in coal. At present, its composition and structure features have not been clearly understood. In this paper, a flash pyrolysis technique with on-line GC (PGC) was used to investigate the properties of the small molecular phase from six kinds of rank coal in China. Experiments were divided into two parts: one is PGC of parent coal; another is PGC of coal extracts from NMP + CS 2 (75:1) solvent extraction at 373 K. Results show that the small molecular phase mainly consists of C 12 -C 16 compounds that could be integrally released when the heating rate was greater than 10 K/ms and the final pyrolysis temperature was 1373 K; other compounds may be the products of decomposition and polymerization from this small molecular phase during pyrolysis.

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Recycle oils from fluid coking of coal liquefaction bottoms

Cited by 6 publications

References 0 publications

An overview of conversion of residues from coal liquefaction processes

An overview of conversion of residues from coal liquefaction processes

An overview of solid–liquid separation of residues from coal liquefaction processes

Analysis of Small Molecular Phase in Coal Involved in Pyrolysis and Solvent Extraction by PGC

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