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Tadeusz Dabros - One of the best experts on this subject based on the ideXlab platform.

  • Determination of the Settling Rate of Aggregates Using the Ultrasound Method during Paraffinic Froth Treatment
    Energy & Fuels, 2016
    Co-Authors: Dominik Kosior, Edwina Ngo, Tadeusz Dabros
    Abstract:

    This paper presents results of a study on the Settling Rate of aggregates formed during paraffinic treatment of bitumen froth. Experiments were performed at temperatures ranging from 30 to 90 °C and various solvent/bitumen ratios, using n-pentane, isopentane, and n-hexane as paraffinic solvents. Characteristic Settling curves of diluted bitumen froth were obtained by two independent methods: visual observation and an ultrasound technique. The ultrasound study showed that the hindered Settling zone interface can be accuRately tracked in place using an ultrasound velocity profiler. Problems associated with determining the Settling Rate by fitting a linear function to the initial part of the Settling curve of the upper interface at higher temperatures were avoided by applying the so-called lower interface method. Settling Rates determined using the upper and lower interface methods showed good agreement, confirming interchangeability of the methods.

  • Monitoring the Settling of Water−Solids−Asphaltenes Aggregates Using In-Line Probe Coupled with a Near-Infrared Spectrophotometer
    Energy & Fuels, 2005
    Co-Authors: Yicheng Long, Tadeusz Dabros
    Abstract:

    Zone Settling develops when bitumen emulsions are treated with aliphatic solvents at solvent-to-bitumen (S/B) ratios that are higher than a critical value. Near-infrared (NIR) spectroscopy is used in combination with an in-line fiber-optic diffuse transflectance probe to monitor the Settling of the water−solids−asphaltenes aggregates in solvent-diluted bitumen. NIR spectra are obtained via the probe that is inserted in the settler, and the Settling Rate is calculated using the acquired NIR spectroscopic data. It was observed that a lighter aliphatic solvent leads to a much higher Settling Rate than a heavier aliphatic solvent at the same S/B dilution ratio. For the same solvent, a higher dilution ratio results in a higher Settling Rate.

  • structure of water solids asphaltenes aggregates and effect of mixing temperature on Settling Rate in solvent diluted bitumen
    Fuel, 2004
    Co-Authors: Yicheng Long, Tadeusz Dabros, Hassan A. Hamza
    Abstract:

    Abstract Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone Settling and the Settling Rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40–0.45 for a system using a 50/50 by wt light n -pentane/ n -hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70–0.75 for a system using heavier n -heptane (C7) solvent at S/B=3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 μm, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 μm. The average volume fraction of the aggregates in the hindered Settling zone is 0.12–0.13 at all studied conditions. Higher temperature (e.g. 50–120 °C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the Settling Rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing Settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably opeRated at near-ambient conditions (e.g. about 30 °C and less than 350 kPa).

  • Structure of water/solids/asphaltenes aggregates and effect of mixing temperature on Settling Rate in solvent-diluted bitumen
    Fuel, 2003
    Co-Authors: Yicheng Long, Tadeusz Dabros, Hassan A. Hamza
    Abstract:

    Abstract Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone Settling and the Settling Rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40–0.45 for a system using a 50/50 by wt light n -pentane/ n -hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70–0.75 for a system using heavier n -heptane (C7) solvent at S/B=3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 μm, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 μm. The average volume fraction of the aggregates in the hindered Settling zone is 0.12–0.13 at all studied conditions. Higher temperature (e.g. 50–120 °C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the Settling Rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing Settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably opeRated at near-ambient conditions (e.g. about 30 °C and less than 350 kPa).

Yicheng Long - One of the best experts on this subject based on the ideXlab platform.

  • Monitoring the Settling of Water−Solids−Asphaltenes Aggregates Using In-Line Probe Coupled with a Near-Infrared Spectrophotometer
    Energy & Fuels, 2005
    Co-Authors: Yicheng Long, Tadeusz Dabros
    Abstract:

    Zone Settling develops when bitumen emulsions are treated with aliphatic solvents at solvent-to-bitumen (S/B) ratios that are higher than a critical value. Near-infrared (NIR) spectroscopy is used in combination with an in-line fiber-optic diffuse transflectance probe to monitor the Settling of the water−solids−asphaltenes aggregates in solvent-diluted bitumen. NIR spectra are obtained via the probe that is inserted in the settler, and the Settling Rate is calculated using the acquired NIR spectroscopic data. It was observed that a lighter aliphatic solvent leads to a much higher Settling Rate than a heavier aliphatic solvent at the same S/B dilution ratio. For the same solvent, a higher dilution ratio results in a higher Settling Rate.

  • structure of water solids asphaltenes aggregates and effect of mixing temperature on Settling Rate in solvent diluted bitumen
    Fuel, 2004
    Co-Authors: Yicheng Long, Tadeusz Dabros, Hassan A. Hamza
    Abstract:

    Abstract Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone Settling and the Settling Rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40–0.45 for a system using a 50/50 by wt light n -pentane/ n -hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70–0.75 for a system using heavier n -heptane (C7) solvent at S/B=3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 μm, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 μm. The average volume fraction of the aggregates in the hindered Settling zone is 0.12–0.13 at all studied conditions. Higher temperature (e.g. 50–120 °C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the Settling Rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing Settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably opeRated at near-ambient conditions (e.g. about 30 °C and less than 350 kPa).

  • Structure of water/solids/asphaltenes aggregates and effect of mixing temperature on Settling Rate in solvent-diluted bitumen
    Fuel, 2003
    Co-Authors: Yicheng Long, Tadeusz Dabros, Hassan A. Hamza
    Abstract:

    Abstract Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone Settling and the Settling Rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40–0.45 for a system using a 50/50 by wt light n -pentane/ n -hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70–0.75 for a system using heavier n -heptane (C7) solvent at S/B=3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 μm, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 μm. The average volume fraction of the aggregates in the hindered Settling zone is 0.12–0.13 at all studied conditions. Higher temperature (e.g. 50–120 °C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the Settling Rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing Settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably opeRated at near-ambient conditions (e.g. about 30 °C and less than 350 kPa).

Hassan A. Hamza - One of the best experts on this subject based on the ideXlab platform.

  • structure of water solids asphaltenes aggregates and effect of mixing temperature on Settling Rate in solvent diluted bitumen
    Fuel, 2004
    Co-Authors: Yicheng Long, Tadeusz Dabros, Hassan A. Hamza
    Abstract:

    Abstract Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone Settling and the Settling Rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40–0.45 for a system using a 50/50 by wt light n -pentane/ n -hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70–0.75 for a system using heavier n -heptane (C7) solvent at S/B=3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 μm, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 μm. The average volume fraction of the aggregates in the hindered Settling zone is 0.12–0.13 at all studied conditions. Higher temperature (e.g. 50–120 °C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the Settling Rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing Settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably opeRated at near-ambient conditions (e.g. about 30 °C and less than 350 kPa).

  • Structure of water/solids/asphaltenes aggregates and effect of mixing temperature on Settling Rate in solvent-diluted bitumen
    Fuel, 2003
    Co-Authors: Yicheng Long, Tadeusz Dabros, Hassan A. Hamza
    Abstract:

    Abstract Emulsified water droplets (WD), dispersed solids (DS), and precipitated asphaltenes (PA) form aggregates when bitumen emulsions are treated with aliphatic solvents. The WD/DS/PA aggregates in solvent-diluted bitumen exhibit zone Settling and the Settling Rate is strongly influenced by aggregate structure. In this work, procedures were developed for determining structural parameters of the aggregates. The average porosity of the aggregates was found to be 0.40–0.45 for a system using a 50/50 by wt light n -pentane/ n -hexane solvent mixture (C5C6) at a solvent-to-bitumen ratio (S/B, by wt) of 2.0 and 0.70–0.75 for a system using heavier n -heptane (C7) solvent at S/B=3.0. Consequently, the effective aggregate density for the C5C6 solvent system (approximately 1.00 g/ml) is higher than that for the C7 solvent system (approximately 0.87 g/ml). The aggregates formed in the C5C6 solvent contain embedded or attached water droplets larger than 20 μm, while the water droplets in the aggregates using the C7 solvent are generally smaller than 10 μm. The average volume fraction of the aggregates in the hindered Settling zone is 0.12–0.13 at all studied conditions. Higher temperature (e.g. 50–120 °C) for mixing of the bitumen emulsion and solvent leads to larger aggregates and results in a significant increase in the Settling Rate of the aggregates. Mixing at elevated temperature provides an efficient means of increasing Settling flux in settlers that are used to treat the solvent-diluted bitumen emulsions, especially when the settlers are preferably opeRated at near-ambient conditions (e.g. about 30 °C and less than 350 kPa).

Edwina Ngo - One of the best experts on this subject based on the ideXlab platform.

  • Aggregates in Paraffinic Froth Treatment: Settling Properties and Structure
    Energy & Fuels, 2018
    Co-Authors: Dominik Kosior, Edwina Ngo
    Abstract:

    The Settling Rate of aggregates formed during paraffinic froth treatment depends strongly on process conditions. This work examined the influences of process temperature, solvent-to-bitumen ratio (S/B), and type of solvent used on the Settling Rate. Experiments were performed at temperatures ranging from 30 to 90 °C and various S/Bs, using isopentane, n-pentane, and n-hexane as paraffinic solvents. Based on studies of the Settling Rate, two factors can be emphasized. First, process temperature has the greatest influence on the Settling Rate of aggregates. Second, for a given solvent and temperature, increasing S/B results in an increase of the Settling Rate. Study of the aggregates formed during paraffinic froth treatment allowed for better understanding of the phenomena affecting the Settling Rate. Besides developing an aggregate sampling method based on solubility parameters, experimental procedures for determining structural parameters were successfully applied.

  • Determination of the Settling Rate of Aggregates Using the Ultrasound Method during Paraffinic Froth Treatment
    Energy & Fuels, 2016
    Co-Authors: Dominik Kosior, Edwina Ngo, Tadeusz Dabros
    Abstract:

    This paper presents results of a study on the Settling Rate of aggregates formed during paraffinic treatment of bitumen froth. Experiments were performed at temperatures ranging from 30 to 90 °C and various solvent/bitumen ratios, using n-pentane, isopentane, and n-hexane as paraffinic solvents. Characteristic Settling curves of diluted bitumen froth were obtained by two independent methods: visual observation and an ultrasound technique. The ultrasound study showed that the hindered Settling zone interface can be accuRately tracked in place using an ultrasound velocity profiler. Problems associated with determining the Settling Rate by fitting a linear function to the initial part of the Settling curve of the upper interface at higher temperatures were avoided by applying the so-called lower interface method. Settling Rates determined using the upper and lower interface methods showed good agreement, confirming interchangeability of the methods.

Dominik Kosior - One of the best experts on this subject based on the ideXlab platform.

  • Aggregates in Paraffinic Froth Treatment: Settling Properties and Structure
    Energy & Fuels, 2018
    Co-Authors: Dominik Kosior, Edwina Ngo
    Abstract:

    The Settling Rate of aggregates formed during paraffinic froth treatment depends strongly on process conditions. This work examined the influences of process temperature, solvent-to-bitumen ratio (S/B), and type of solvent used on the Settling Rate. Experiments were performed at temperatures ranging from 30 to 90 °C and various S/Bs, using isopentane, n-pentane, and n-hexane as paraffinic solvents. Based on studies of the Settling Rate, two factors can be emphasized. First, process temperature has the greatest influence on the Settling Rate of aggregates. Second, for a given solvent and temperature, increasing S/B results in an increase of the Settling Rate. Study of the aggregates formed during paraffinic froth treatment allowed for better understanding of the phenomena affecting the Settling Rate. Besides developing an aggregate sampling method based on solubility parameters, experimental procedures for determining structural parameters were successfully applied.

  • Determination of the Settling Rate of Aggregates Using the Ultrasound Method during Paraffinic Froth Treatment
    Energy & Fuels, 2016
    Co-Authors: Dominik Kosior, Edwina Ngo, Tadeusz Dabros
    Abstract:

    This paper presents results of a study on the Settling Rate of aggregates formed during paraffinic treatment of bitumen froth. Experiments were performed at temperatures ranging from 30 to 90 °C and various solvent/bitumen ratios, using n-pentane, isopentane, and n-hexane as paraffinic solvents. Characteristic Settling curves of diluted bitumen froth were obtained by two independent methods: visual observation and an ultrasound technique. The ultrasound study showed that the hindered Settling zone interface can be accuRately tracked in place using an ultrasound velocity profiler. Problems associated with determining the Settling Rate by fitting a linear function to the initial part of the Settling curve of the upper interface at higher temperatures were avoided by applying the so-called lower interface method. Settling Rates determined using the upper and lower interface methods showed good agreement, confirming interchangeability of the methods.