Partial oxidation of n-hexadecane and polyethylene in supercritical water

Watanabe, Masaru; Mochiduki, Makoto; Sawamoto, Shuhei; Adschiri, Tadafumi; Arai, Kunio

doi:10.1016/s0896-8446(01)00070-5

Cited by 87 publications

(38 citation statements)

References 17 publications

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“…The partial SCWO of some model hydrocarbon compounds [84][85][86][87][88][89][90][91] and asphalt [59] showed that the in situ hydrogen is more active than molecular hydrogen in the case of the hydrogenation of hydrocarbon. Sato et al [42] reported the effects of reaction temperature, water/oil ratio, and air pressure as an oxygen source, on the formation of coke.…”

Section: Partial Scwomentioning

confidence: 99%

A Review of Laboratory-Scale Research on Upgrading Heavy Oil in Supercritical Water

Yan

Xiao

2015

Energies

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Abstract:With the growing demand for energy and the depletion of conventional crude oil, heavy oil in huge reserve has attracted extensive attention. However, heavy oil cannot be directly refined by existing processes unless they are upgraded due to its complex composition and high concentration of heteroatoms (N, S, Ni, V, etc.). Of the variety of techniques for heavy oil upgrading, supercritical water (SCW) is gaining popularity because of its excellent ability to convert heavy oil into valued, clean light oil by the suppression of coke formation and the removal of heteroatoms. Based on the current status of this research around the world, heavy oil upgrading in SCW is summarized from three aspects: Transformation of hydrocarbons, suppression of coke, and removal of heteroatoms. In this work, the challenge and future development of the orientation of upgrading heavy oil in SCW are pointed out.

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Section: Partial Scwomentioning

confidence: 99%

A Review of Laboratory-Scale Research on Upgrading Heavy Oil in Supercritical Water

Yan

Xiao

2015

Energies

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“…Figure 2a shows clearly that yields of the gas components changed dramatically between the non-catalytic and catalytic tests as well as among the catalytic tests. In the non-catalytic tests, C2-C4 hydrocarbon gases dominated the gas products as a result of thermal pyrolysis of the plastic [4][5][20][21]. Similar yields of hydrocarbon gases are obtained from conventional pyrolysis of LDPE [22].…”

Section: Solid Analysismentioning

confidence: 95%

Catalytic supercritical water gasification of plastics with supported RuO2: A potential solution to hydrocarbons–water pollution problem

Onwudili

Williams

2016

Process Safety and Environmental Protection

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ABSTRACT:Here we report on a potential catalytic process for efficient clean-up of plastic pollution in waters, such as the Great Pacific Garbage Patch (CPGP). Detailed catalytic mechanisms of RuO2 during supercritical water gasification of common polyolefin plastics including low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP) and polystyrene (PP), have been investigated in a batch reactor at 450 °C, 60 min. All four plastics gave very high carbon gasification efficiencies (CGE) and hydrogen gasification efficiencies (HGE). Methane as the highest gas component, with a yield of up to 37 mol kg -1 LDPE using the 20 wt% RuO2 catalyst. Evaluation of the gas yields, CGE and HGE revealed that the conversion of PS involved thermal degradation, steam reforming and methanation; whereas hydrogenolysis was a possible additional mechanism during the conversion of aliphatic plastics. The process has the benefits of producing a cleanpressurized methane-rich fuel gas as well as cleaning up hydrocarbons-polluted waters.

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“…Partial oxidation of n-hexadecane in SCW was investigated using a tube bomb reactor 7) . The selectivity for CO and H2 which was probably derived from CO through the WGSR in gas products, increased with increasing water density at 673 K and initial oxygen/carbon molar ratio of 0.3.…”

Section: Partial Oxidation Of Hydrocarbonsmentioning

confidence: 99%

Upgrading of Heavy Oil by Hydrogenation through Partial Oxidation and Water-gas Shift Reaction in Supercritical Water

Sato

2014

J. Jpn. Petrol. Inst.

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Partial oxidation of hydrocarbons including heavy oil in supercritical water forms CO and CO2, which undergoes the water-gas shift reaction to form active hydrogen and then hydrogenation of heavy oil proceeds. In the case of partial oxidation of hydrocarbons and bitumen in supercritical water, the selectivity for partial oxidative products such as CO increased with increasing water density. In the case of hydrogenation of heavy oil in supercritical water through the water-gas shift reaction, reverse water-gas shift reaction and decomposition of formic acid that is a reaction intermediate of the water-gas shift reaction, coke formation was suppressed compared to that in only supercritical water. The main factors for suppressing coke formation were as follows: high water density improving the reactivity of hydrogen source in the oil-rich phase that enhanced hydrogenation of asphaltene core, direct injection of hydrogen source into the oil-rich phase increasing the concentration of active hydrogen in that phase, and coexisting gases with supercritical water facilitating the extraction of coke precursor from the oil-rich phase. The upgrading of heavy oil through a series of partial oxidation and hydrogenation reactions in supercritical water proceeded in the presence of catalyst and possible optimum conditions were proposed.

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Partial oxidation of n-hexadecane and polyethylene in supercritical water

Cited by 87 publications

References 17 publications

A Review of Laboratory-Scale Research on Upgrading Heavy Oil in Supercritical Water

A Review of Laboratory-Scale Research on Upgrading Heavy Oil in Supercritical Water

Catalytic supercritical water gasification of plastics with supported RuO2: A potential solution to hydrocarbons–water pollution problem

Upgrading of Heavy Oil by Hydrogenation through Partial Oxidation and Water-gas Shift Reaction in Supercritical Water

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