The effect of supercritical water on the hydroconversion of Tahe Residue

Gao, Liang; Liu, Yuandong; Wen, Li‐Rong; Huang, Weixia; Mu, Xuhong; Zong, Baoning; Fan, Honglei; Han, Buxing

doi:10.1002/aic.12227

Cited by 18 publications

(13 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dutta et al [73] tested the hydrogen exchange from steam to thermally cracked bitumen molecules by doping water with D2O in a temperature range of 623-803 K. They measured the exchanging degrees of three types hydrogen (α-, β-, γ-) in bitumen and found that the α-H were prone to be exchanged with the H of water. Gao et al [74] used D2O as a tracer to study the hydroconversion of Tahe residue in SCW. The results showed that water participated the hydrocarbon transformation through radicals and the proportion of water molecules involved in the hydrogen exchange was about 40% when the water content in the reaction mixture was 10 wt %.…”

Section: Mechanisms Of Hydrocarbons Transformationmentioning

confidence: 99%

“…The formation of large amounts of coke, through the propagation reactions of radicals, the aggregation of asphaltene, and the addition between activated asphaltene precursors and low molecular radicals or olefins [50,79], not only affects the efficient exploitation of heavy oil, but also brings a series of problems, such as the deactivation of catalysts. Fortunately, the introduction of SCW into heavy oil can effectively reduce the yield of coke [11,[73][74][75]80,81]. To further suppress the formation of coke, many novel SCW processes have been successfully developed.…”

Section: Suppression Of Cokementioning

confidence: 99%

See 1 more Smart Citation

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

Yan

Xiao

2015

Energies

View full text Add to dashboard Cite

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.

show abstract

Section: Mechanisms Of Hydrocarbons Transformationmentioning

confidence: 99%

Section: Suppression Of Cokementioning

confidence: 99%

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

Yan

Xiao

2015

Energies

View full text Add to dashboard Cite

show abstract

“…The thermophysical properties of supercritical water ( P c = 22.1 MPa, T c = 374°C) are quite different from those at ambient conditions, and it is a good solvent for nonpolar organic compounds and gases such as oxygen, nitrogen, and carbon dioxide . Supercritical water oxidation (SCWO) has been proven to be a promising technology to treat organic waste and recover energy .…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of a transpiring‐wall SCWO reactor: Formation and optimization of the water film

Zhang

2015

AIChE Journal

View full text Add to dashboard Cite

A two-dimensional axisymmetric computational fluid dynamics model of a transpiring wall reactor for supercritical water oxidation was developed using the commercial software Fluent 6.3. Numerical model was validated by comparisons with experimental temperature profiles and product properties (total organic carbon and CO). Compared with the transpiration intensity, the transpiring water temperature was found to have a more significant influence on the reaction zone. An assumption that an ideal corrosion and salt deposition inhibitive water film can be formed when the temperature of the inner surface of the porous tube is less than 3748C was made. It was observed that lowering transpiring water temperature is conducive to the formation of the water film at the expense of feed degradation. The appropriate mass flux ratio between the total transpiring flow and the core flow was determined at 0.05 based on the formation of the water film and feed degradation.

show abstract

“…Similar observations were made in hydroconversion experiments of Tahe residue oil when SCW was combined with hydrogen. It was observed that the addition of SCW restrained hydrogenation reactions by quenching free radicals that could potentially lead to further cracking and condensation of high molecular weight compounds, reducing the amount of coke produced and increasing that of liquid products . In addition, it has been observed that the presence or addition of light olefins to the feedstock can play an important role as initiator, promoter, and reactant during the cracking of heavy hydrocarbons in SCW …”

Section: Ncw and Scw Upgrading Of Heavy Oil Real Feedstocksmentioning

confidence: 99%

Application of Water in Hydrothermal Conditions for Upgrading Heavy Oils: A Review

et al. 2017

View full text Add to dashboard Cite

The use of water in hydrothermal and supercritical conditions as a medium to upgrade heavy oil fractions has shown promising results and presents an interesting alternative for heavy oil processing. Water at these conditions improves transport properties increasing the solubility in the medium and reducing the viscosity of the oil, which facilitates the upgrading process. This review focuses on the use of water as a medium to recover and upgrade heavy oils. An analysis of the main reactions occurring, effect of process conditions, and role of water in the reaction mechanism is carried out based on experimental results found in the literature. Studies performed with model compounds that have enabled a proper understanding of the reaction mechanisms, kinetics, and effect of process conditions in the upgrading of heavy oil in near critical or supercritical water are included. An overview of the main challenges of the technology such as corrosion and salt deposition as well as some innovative reactor designs to solve them is provided. Information regarding research carried out in this field has been linked to the growing industrial interest in the technology showing recent developments and registration of patents on reactor designs and processes involving heavy oil upgrading in near and supercritical water.

show abstract

The effect of supercritical water on the hydroconversion of Tahe Residue

Cited by 18 publications

References 14 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

CFD simulation of a transpiring‐wall SCWO reactor: Formation and optimization of the water film

Application of Water in Hydrothermal Conditions for Upgrading Heavy Oils: A Review

Contact Info

Product

Resources

About