Using a Fiber-Optic Probe for the Measurement of Volumetric Expansion of Liquids

Mueller, Sean G.; Werber, Jay R.; Al‐Dahhan, Muthanna H.; Duduković, Milorad P.

doi:10.1021/ie061630y

Cited by 15 publications

(15 citation statements)

References 12 publications

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“…Apart from measuring phase boundaries, we have also demonstrated that the FOR method can be used for monitoring the volumetric expansion of organic solvents with scCO 2 by immersing the end of the optic fibre into liquid (Avdeev et al 2004). Recent work by Dudukovic and his co-workers (Mueller et al 2007) has also reported a fibre-optic approach for measuring volumetric expansion, in which a multi-mode optical fibre is employed as a position sensor for monitoring the position of the meniscus between the liquid and the CO 2 phase.…”

Section: The Fibre-optic Reflectometermentioning

confidence: 90%

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Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Sánchez-Vicente

Akien

et al. 2010

Proc. R. Soc. A.

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Detecting phase transitions in high-pressure CO 2 and supercritical fluids was first attempted in the nineteenth century. By contrast, Green Chemistry, the design and implementation of cleaner methods of manufacturing and processing chemicals, is barely 20 years old. Now, the use of CO 2 as an environmentally more acceptable replacement for traditional solvents for greener chemical reactions is creating the need for new, more rapid methods for elucidating high-pressure phase behaviour. This paper describes the advantages and limitations of a number of approaches, developed in Nottingham, to meet this need, including acoustic measurements, shear-mode quartz sensors, the fibre-optic reflectometer, the use of holey fibres, attenuated total reflectance infrared spectroscopy and pressure drop measurements.

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Section: The Fibre-optic Reflectometermentioning

confidence: 90%

“…Recent work by Dudukovic and his co-workers (Mueller et al 2007) has also reported a fibre-optic approach for measuring volumetric expansion, in which a multi-mode optical fibre is employed as a position sensor for monitoring the position of the meniscus between the liquid and the CO 2 phase.…”

Section: The Fibre-optic Reflectometermentioning

confidence: 99%

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Sánchez-Vicente

Akien

et al. 2010

Proc. R. Soc. A.

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“…The method of optical fiber probes was developed in the second half of the 20th century [34]. Recent studies dealt with single-fiber probes using the same fiber as emitter and receiver [35][36][37][38][39]. On the contrary, the current work is based on a twofiber optical sensor where an emitting and a receiving fiber are applied separately.…”

Section: Optical Fiber Sensorsmentioning

confidence: 99%

Homogeneous Gas‐Liquid Distribution for Monolithic Structures via a Needle Distributor

et al. 2017

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthday Structured catalysts are a widely discussed approach for process intensification of chemical multiphase reactors. But equal to common catalyst structures, homogeneous educt distribution along the catalytic surface is mandatory for high reactor performance. Especially monolithic structures require a homogeneous initial fluid distribution. A novel distribution concept for gas-liquid flow through arbitrary channel matrices is presented. It is based on the injection principle where gas and liquid are inserted directly into the channels. A prototype for different cell densities was built and tested by various measurement techniques: gravimetry, X-ray tomography, and an optical fiber sensor. Additionally, the flow regime per channel was detected as equal to single-channel conditions.

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“…In-situ fiber optic spectroscopy provides a solution to this challenge. It is gaining attention in the field of heterogeneous catalysis [17][18][19][20][21][22][23][24][25], continuous process analyses [26][27][28][29][30], batch process analyses [31,32] and clinical applications [33,34]. For example, a fiber optic based UV-vis CCD spectrometer was employed for the determination of nickel breakthrough in an ion-exchange column [26].…”

Section: Introductionmentioning

confidence: 99%

A fiber optics system for monitoring utilization of ZnO adsorbent beds during desulfurization for logistic fuel cell applications

Sujan

Yang

Dimick

et al. 2016

Journal of Power Sources

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An in-situ fiber optic based technique for direct measurement of capacity utilization of ZnO adsorbent beds by monitoring bed color changes during desulfurization for fuel cell systems is presented. Adsorbents composed of bulk metal oxides (ZnO) and supported metal oxides (ZnO/SiO 2 and Cu-ZnO/SiO 2) for H 2 S removal at 22 °C are examined. Adsorbent bed utilization at breakthrough is determined by the optical sensor as the maximum derivative of area under UV-vis spectrum from 250-800 nm observed as a function of service time. Since the response time of the sensor due to bed color change is close to bed breakthrough time, a series of probes along the bed predicts utilization of the portion of bed prior to H 2 S breakthrough. The efficacy of the optical sensor is evaluated as a function of inlet H 2 S concentration, H 2 S flow rate and desulfurization in presence of CO, CO 2 and moisture in feed. A 6 mm optical probe is employed to measure utilization of a 3/16 inch ZnO extrudate bed for H 2 S removal. It is envisioned that with the application of the optical sensor, desulfurization can be carried out at high adsorbent utilization and low operational costs during on-board miniaturized fuel processing for logistic fuel cell power systems.

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Using a Fiber-Optic Probe for the Measurement of Volumetric Expansion of Liquids

Cited by 15 publications

References 12 publications

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Homogeneous Gas‐Liquid Distribution for Monolithic Structures via a Needle Distributor

A fiber optics system for monitoring utilization of ZnO adsorbent beds during desulfurization for logistic fuel cell applications

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