Sulfur removal from coal with supercritical fluid treatment

Park, Jung Hoon; Joung, Yong Ou; Park, Sang Do

doi:10.1007/s11814-007-5043-y

Cited by 11 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result about reaction time is in good agreement with a previous study for Chinese Datong coal [18]. In the report, reaction time for supercritical water treatment using micro reactor was fixed on 90 min for each run because total conversion increased sharply within 30 min and then the increasing rate was very low in the range of 60-90 min at 380 o C and 25 MPa.…”

Section: Effect Of Reaction Timesupporting

confidence: 90%

Extraction of bitumen with sub- and supercritical water

Park

Son

2010

Korean J. Chem. Eng.

Self Cite

View full text Add to dashboard Cite

The sub-and supercritical water extractions of Athabasca oil sand bitumens were studied using a micro reactor. The experiments were carried out in the temperature range of 360-380 o C, pressure 15-30 MPa and water density 0.07-0.65 g/cm 3 for 0-2 hrs. The extraction conversion of bitumens increased with solvent power and temperature. A maximum conversion of 24% was obtained after 90 min extraction at the supercritical condition. Hydrogen and carbon mono-oxide were not detected in sub-critical region but in the supercritical region. The supercritical condition was favorable to the hydrogen formation for bitumen extraction. The extraction products were upgraded relative to the original bitumens due to direct hydrolysis of low-energy linkage and H 2 formed by water gas shift reaction in supercritical condition. 18% of initial sulfur in bitumen can be removed at maximum conversion condition. The asphaltene contents of the residue were significantly higher than that of original bitumen due to preferential extraction of aromatic compounds in supercritical condition.

show abstract

Section: Effect Of Reaction Timesupporting

confidence: 90%

Extraction of bitumen with sub- and supercritical water

Park

Son

2010

Korean J. Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has been shown to stimulate the cleavage of ester bonds (Hu et al, 1998;Bermejo et al, 2004) and thus provide a deep conversion of organic matter from coal. Toluene is of particular interest to technology because it is an abundant component of low-boiling fractions obtained in various coal conversion processes and has an easily attainable critical temperature (318.6°C), pressure (4.11 MPa) and density (0.292 g/cm 3 ) (Torrente and Galán, 2010;Park et al, 2007;Owczarek and Blazej, 2003;Hourcade et al, 2007). However the extent of coal extraction in toluene media was rather low.…”

Section: Introductionmentioning

confidence: 99%

Study of Supercritical Coal Extraction in Toluene Containing Fluids

Kuznetsov¹,

Kolesnikova²,

Кузнецова³

et al. 2016

American Journal of Applied Sciences

View full text Add to dashboard Cite

Abstract:The conversion of brown coals and sapropelic coal in toluene containing mixtures with co-solvents (water, ethanol and tetralin) was studied under sub-and supercritical conditions within the temperature range of 375-550°C and at pressures from 7 to 40 MPa. It was found that the extent of coal extraction in the toluene solvent medium, at 400°C, was significantly increased by the addition of small amounts of hydrogen-donor tetralin or ethanol co-solvents. The extract yield from sapropelic coal reached 79-83%, with the gas yield being small. The effect of process variables on extract yields under sub-and supercritical conditions was monitored. Coal extraction in the toluene-tetralin mixtures was found to depend mainly on the hydrogen donor ability of the tetralin co-solvent irrespective of sub-or supercritical toluene states. According to the composition, the bitumen extracted from coals can be used as a feedstock for pitch production. In the water containing mediums, aside from coal liquefaction, coal methanation, hydrolysis and oxidation reactions occurred resulting in the generation of large amounts of methane, hydrogen and carbon dioxide.

show abstract

“…Water above its critical point is potentially quite important as a solvent for organic compounds. Above 350°C, water becomes miscible with oils and aromatics, as the dielectric constant of SCW is reduced from 2 to 20, which is similar to that of polar organic solvents at room temperature (Park et al, 2007).…”

Section: Introductionmentioning

confidence: 87%

Sulfur removal from crude oil using supercritical water

Demırbas

2016

Petroleum Science and Technology

View full text Add to dashboard Cite

Desulfurization of crude oil using supercritical water (SCW) is one of the promising nonconventional processes for upgrading oil. SCW is an excellent solvent for high molecular weight organic compounds in crude oils. Low sulfur content of crude oil is particularly preferred. Water is one of the most commonly used supercritical fluids suitable as a substitute for organic solvents in a range of industrial processes. Supercritical fluid treatment depends on various parameters such as pressure, temperature, extraction time, solvent type, and chemical composition of the extracted material. SCW desulfurization has potential as a technique for removing sulfur from feedstocks such as heavy oil and bitumen. SCW upgrading of crude oils reduces sulfur content and decreases average molecular weight. Catalytic desulfurization of residual oil has been carried out through partial oxidation in supercritical water and thus 60% of the sulfur was removed.

show abstract

Sulfur removal from coal with supercritical fluid treatment

Cited by 11 publications

References 0 publications

Extraction of bitumen with sub- and supercritical water

Extraction of bitumen with sub- and supercritical water

Study of Supercritical Coal Extraction in Toluene Containing Fluids

Sulfur removal from crude oil using supercritical water

Contact Info

Product

Resources

About