Characterization of a continuous micro-scale pilot unit for petroleum residue hydroconversion with dispersed catalysts: Hydrodynamics and performances in once-through and recycling mode

Jansen, Tim; Guerry, Dimitri; Gotteland, D.; Bacaud, R.; Lacroix, Maxime; Ropars, Marie; Lorentz, Chantal; Geantet, Christophe; Tayakout‐Fayolle, Mélaz

doi:10.1016/j.cej.2014.05.032

Cited by 18 publications

(21 citation statements)

References 32 publications

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“…This decrease was not only due to the composition of the unconverted residue, but also to the recycle ratio, which increased from 25 vol% (condition 7) to 300 vol % (condition 11) and from 33 vol % (condition 12) to 100 vol % (condition 13). The compositions of the reactor feed for conditions 11 and 13 were similar to that of an AR. , For these conditions, the VGO content in reaction products reached up to 40 wt %. It can be concluded that the recycling of the unconverted residue induced a dilution effect on the fresh feed due to high content of reaction products as a consequence of the low efficiency of the HPHT separator.…”

Section: Results and Discussionmentioning

confidence: 65%

“…The compositions of the reactor feed for conditions 11 and 13 were similar to that of an AR. 32,36 For these conditions, the VGO content in reaction products reached up to 40 wt %. It can be concluded that the recycling of the unconverted residue induced a dilution effect on the fresh feed due to high content of reaction products as a consequence of the low efficiency of the HPHT separator.…”

Section: Resultsmentioning

confidence: 94%

“…Figure presents the flow diagram of the continuous micropilot unit. This unit was previously used for the slurry-phase hydroconversion of an Arabian light AR. , Some technical modifications were made to adapt this unit to heavier feeds such as Safaniya VR. The micropilot unit is equipped with two high pressure double-piston pump systems: feed pumps and recycle pumps.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…Bellussi et al tested a dual-catalyst system in a pilot scale 7.5 L ebullated bed slurry reactor with a continuous recycle and separation system, but few results were reported and no specific details of the recycled feed were presented. Jansen et al performed slurry-phase hydroconversion experiments with an Arabian light AR in a microscale pilot equipped with a continuous recycle stream. The experimental impact of the recycle was not conclusive as OTOM and ROM exhibited similar behavior in terms of conversion and product composition.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Unconverted Residue Recycling on Slurry-Phase Hydroconversion Performance in a Continuous Microscale Pilot Unit

et al. 2020

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The impact of recycling unconverted residue on slurry-phase hydroconversion performance was investigated in a continuous microscale pilot unit operated in once-through (OTOM) and recycling (ROM) operating modes. Hydroconversion experiments were performed with Safaniya Vacuum Residue at reaction temperatures from 420 to 440 °C, process residence times from 1 to 4 h, and recycling ratios from 25 to 300 vol %. Total pressure and inlet catalyst concentration were maintained constant at 15 MPa and 1000 wt ppm of molybdenum in fresh feed. Residue (RES) conversion, hydrodesulfurization (HDS) rate, and product yields and selectivities obtained in OTOM and ROM were compared from two points of view: those of the overall process and the reactor (single-pass). When the process was operated in ROM, the single-pass performance decreased due to a loss of cracking severity through reduced reactor residence time and dilution of fresh feed by recycled reaction products. These effects also impacted the overall performance at 430 °C. However, by increasing the reaction temperature to 440 °C, the loss of cracking severity was countered, and the overall performance increased. Moreover, the mild reaction conditions generated by the recycling increased the overall production of vacuum gas oil (VGO), C 1 −C 4 gases (GAS), and H 2 S and decreased those of naphtha (NAPH) and distillates (DIST). No coke formation was observed, indicating that the recycling of reaction products, especially VGO, would improve the colloidal stabilization of partially converted asphaltenes. Since large quantities of reaction products were recycled, no reactivity loss could be observed for the unconverted residue.

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Section: Results and Discussionmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 94%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Unconverted Residue Recycling on Slurry-Phase Hydroconversion Performance in a Continuous Microscale Pilot Unit

et al. 2020

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“…1,4 Slurry-phase hydroconversion reactors operating with unsupported metal sulphide catalysts (such as MoS 2 ) 2,4-7 are effective in this role, resulting in high feedstock conversions (>80 wt%), liquid yields (>90 wt%) and heteroatom removal (>35 wt% S), with low coke (<6 wt%) and gas (<2 wt%) yields. 1,4,5, [7][8][9][10][11][12][13][14] Slurry-phase reaction systems are also effective in the upgrading of fast pyrolysis oil 15 with the high oxygen (>45 wt%) content of bio-oils resulting in a low heating value (approximately 18 MJ/kg), high viscosity (which may range from 100 cPs to over 100,000 cPs) and poor stability 16,17 . Catalytic hydrodeoxygenation (HDO) may be employed to reduce the oxygen content of bio-oils 15,16,18 .…”

Section: Introductionmentioning

confidence: 99%

Slurry-Phase Batch Microreactor for Hydroconversion Studies

Kukard

Smith

2015

Energy Fuels

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A novel micro-reactor that allows mixed, slurry-phase batch experiments to be conducted at temperatures to 445 • C and pressures of 13.8 MPa is reported. The reactor uses a glass insert to isolate the reaction mixture from the catalytically active reactor walls, a vortex mixer to promote gas-liquid-solid mixing and requires only 150 µL of reaction mixture to operate. The rapid heat-up and cool-down (to 445 • C and back to room temperature in under 30 min) afforded by the small size makes this reactor ideal for fast catalyst screening studies. The utility of the reactor is demonstrated through a study of the hydroconversion of diphenylmethane (DPM) at 445 • C and 13.8 MPa and the hydrodeoxygenation of 4-methylphenol (4-MP) at 375 • C and 4.8MPa, both conducted using unsupported MoS 2 catalyst. High-speed video is used to identify 2000 rpm as the optimum mixing speed for the micro-reactor. Conversion data for DPM and 4-MP in the micro-reactor is used to determine rate constants for the reactions and hence quantify MoS 2 catalytic activity and thermal/reactor wall activity. The MoS 2 activity is found to be in good agreement with published stirred batch reactor results using the same catalyst.

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Comparison of unsupported WS2 and MoS2 catalysts for slurry phase hydrocracking of vacuum residue

Jeong

Lee

2019

Applied Catalysis A: General

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Characterization of a continuous micro-scale pilot unit for petroleum residue hydroconversion with dispersed catalysts: Hydrodynamics and performances in once-through and recycling mode

Cited by 18 publications

References 32 publications

Impact of Unconverted Residue Recycling on Slurry-Phase Hydroconversion Performance in a Continuous Microscale Pilot Unit

Impact of Unconverted Residue Recycling on Slurry-Phase Hydroconversion Performance in a Continuous Microscale Pilot Unit

Slurry-Phase Batch Microreactor for Hydroconversion Studies

Comparison of unsupported WS2 and MoS2 catalysts for slurry phase hydrocracking of vacuum residue

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