Supercritical water treatment of oil sludge, a viable route to valorize waste oil materials

Radfarnia, Hamid R.; Khulbe, C P; Little, E C

doi:10.1016/j.fuel.2015.06.094

Cited by 26 publications

(4 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the heat q released in reaction (5) is equal to the high heating value (HHV) CF calculated using formula (4).…”

Section: Resultsmentioning

confidence: 99%

“…Tar conversion in supercritical water (SCW) was studied in a number of papers [2][3][4][5][6][7][8], in which a high yield of hydrocarbon (HC) fractions, with an atomic H/C ratio exceeding that in the feed, was attained. We examined tar conversion under different conditions and ways of implementation of the process: pumping of SCW through a layer of tar at 673 K [5] and at uniform temperature increase from 673 to 973 K [6]; feeding tar into a counter flow of SCW along the axis of a vertical tubular reactor at 673 K [6] and with a temperature gradient of 723-923 K [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Conversion of tar in supercritical water/oxygen fluid with soot suppression

Vostrikov

Fedyaeva

Kolobov

2017

J. Engin. Thermophys.

View full text Add to dashboard Cite

An autothermal mode of tar conversion was implemented in a vertical tubular reactor. The pressure was 30 MPa; the tar and water flows were 4.9 and 6.9 g/min, respectively; the oxygen flow varied: 0, 2.9, 4.5 and 5.8 g/min. The tar was supplied from above, at the first stage into a counter-flow of supercritical water (SCW) and at the subsequent ones into a flow of SCW/O 2 fluid. The high-molecular sedimentary layer (HSL) that formed at the first stage was replenished continuously at the subsequent stages, consisted of tar components depositing on the bottom of the reactor and was suppressing formation of soot. The autothermal mode of the process was achieved due to heat release in the combustion of the lower part of the HSL in the SCW/O 2 fluid. With increased O 2 flow, the power of ohmic heaters was reduced to zero and the reactor wall temperature increased from the initial 723 K to 818 K. Elemental and mass spectrometric analyses of the liquid and volatile conversion products collected at the outlet of the reactor, as well as of the solid conversion residue taken from the reactor, enabled determination of their amount and composition. This in turn allowed us to write down the gross reaction of tar conversion in the SCW/O 2 fluid and determine the characteristics of the equivalent fuel and the thermal effects of its oxidation

show abstract

“…where the heat q released in reaction (5) is equal to the high heating value (HHV) CF calculated using formula (4).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conversion of tar in supercritical water/oxygen fluid with soot suppression

Vostrikov

Fedyaeva

Kolobov

2017

J. Engin. Thermophys.

View full text Add to dashboard Cite

show abstract

“…Water is an excellent dispersant and solvent for pyrolysis, decarboxylation, and demetallization in hydrothermal processes, but its hydrogen supply capacity is very low [37]. To remove nitrogen, sulfur, and other heteroatoms from oily sludge by hydrogenation, additional hydrogen sources need to be provided.…”

Section: Hydrothermal Upgrading (Htu)mentioning

confidence: 99%

Catalyzed hydrothermal treatment of oily sludge: A review

Zhang,

et al. 2024

Clean Energy Sci. Technol.

View full text Add to dashboard Cite

Oily sludge is a common by-product of the petroleum exploration industry, which is rich in resources and has strong toxicity. It is categorized as hazardous waste in many nations worldwide. Owing to the distinct physical and chemical characteristics of sub/supercritical water, the application of hydrothermal conversion technology, which uses sub/supercritical water as a medium, has been growing in the utilization of resources and the safe disposal of oily sludge. In this article, the research on the oxygen-free hydrothermal transformation of oil sludge, including hydrothermal carbonization, hydrothermal liquefaction, hydrothermal upgrading, and supercritical water gasification, is reviewed. Due to the significant impact of nitrogenous and sulfurous compounds in sludge on hydrothermal conversion products, the hydrogenation conversion, reaction path, and kinetics for these two compounds were discussed. Finally, a summary and comparison of the studies conducted on carriers and catalysts in hydrothermal processes are provided. This review can offer recommendations for future studies, as well as guidance for the hydrothermal catalytic treatment of oily sludge.

show abstract

“…The efficiency of supercritical fluid extraction is affected by the physicochemical characteristics of the to-be-treated oily sludge as well as the type of supercritical fluid, ratio of supercritical fluid to sludge, and operating conditions, especially temperature and pressure that are crucial in maintaining a supercritical state [113]. Some researchers explored the possibility of using supercritical water for the recovery of liquid fuels [134][135][136][137][138]. More recently, the focus has been placed on the production of syngas from oily sludge using subcritical and supercritical water [139][140][141][142].…”

Section: Hydrothermal Treatmentmentioning

confidence: 99%

Trend in Research on Characterization, Environmental Impacts and Treatment of Oily Sludge: A Systematic Review

Niu¹,

Sun²,

Lin

2022

Molecules

View full text Add to dashboard Cite

Oily sludge is a hazardous material generated from the petroleum industry that has attracted increasing research interest. Although several review articles have dealt with specific subtopics focusing on the treatment of oily sludge based on selected references, no attempt has been made to demonstrate the research trend of oily sludge comprehensively and quantitatively. This study conducted a systematic review to analyze and evaluate all oily sludge-related journal articles retrieved from the Web of Science database. The results show that an increase in oily sludge-related research did not take place until recent years and the distribution of the researchers is geographically out of balance. Most oily sludge-related articles focused on treatment for harmfulness reduction or valorization with limited coverage of formation, characterization, and environmental impact assessment of oily sludge. Pyrolytic treatment has attracted increasing research attention in recent years. So far, the research findings have been largely based on laboratory-scale experiments with insufficient consideration of the cost-effectiveness of the proposed treatment methods. Although many methods have been proposed, few alone could satisfactorily achieve cost-effective treatment goals. To enable sustainable management of oily sludge on a global scale, efforts need to be made to fund more research projects, especially in the major oil-producing countries. Pilot-scale experiments using readily available and affordable materials should be encouraged for practical purposes. This will allow a sensible cost-benefit analysis of a proposed method/procedure for oily sludge treatment. To improve the treatment performance, combined methods are more desirable. To inform the smart selection of methods for the treatment of different oily sludge types, it is suggested to develop universally accepted evaluation systems for characterization and environmental risk of oily sludge.

show abstract

Supercritical water treatment of oil sludge, a viable route to valorize waste oil materials

Cited by 26 publications

References 28 publications

Conversion of tar in supercritical water/oxygen fluid with soot suppression

Conversion of tar in supercritical water/oxygen fluid with soot suppression

Catalyzed hydrothermal treatment of oily sludge: A review

Trend in Research on Characterization, Environmental Impacts and Treatment of Oily Sludge: A Systematic Review

Contact Info

Product

Resources

About