CO<sub>2</sub> as a Viscosity Index Improver for Wind Turbine Oils

Pohrer, Benjamin; Zuercher, Manuel; Westerholt, Antje; Bösmann, Andreas; Siebert, Daniel; Völkl, J.; Holweger, Walter; Wehrum, N.; Arlt, Wolfgang; Wasserscheid, Peter; Schlücker, Eberhard

doi:10.1021/acs.iecr.5b00494

Cited by 4 publications

(6 citation statements)

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“…The mass fraction of CO 2 was found to determine the grade of viscosity modification [12]. Similar results have been obtained by preliminary investigations on polyalphaolefins and ionic liquid systems with CO 2 in gaseous state at pressures below 50 bar [7].…”

Section: Introductionsupporting

confidence: 76%

“…As Pohrer et al [7] already indicated in preliminary viscosity studies with polyalphaolefins, an increased CO 2 pressure results in a decrease in viscosity and a higher VI. The larger the CO 2 pressure and, therefore, the amount of dissolved CO 2 in the lubricant, the stronger the decrease in viscosity.…”

Section: Co 2 Saturation Via Pressure Vesselmentioning

confidence: 58%

“…Another way to modify the physical properties of organic fluids is the solvation of gases like CO 2 [6,7]. The use of CO 2 as a VI improver for lubricants offers numerous benefits, such as having no shear-thinning side effects and the possibility to release the gas at any time by lowering the pressure, while the usage of polymer additives results in a permanent alteration of viscosity.…”

Section: Introductionmentioning

confidence: 99%

“…This allows adjusting the lubricant viscosity to changing operation temperatures and conditions in industrial applications, which face dynamic loads and fluctuating ambient temperatures. At low temperatures or low load conditions, the lubricant viscosity can be reduced by raising the applied CO 2 pressure in order to avoid undesirable power losses, whereas under peak load conditions or high operating temperatures the dissolved gas is released to increase viscosity [7].…”

Section: Introductionmentioning

confidence: 99%

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Practical Application of CO₂ as a Viscosity Index Improver for Lubricants

et al. 2016

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In terms of reducing power losses and ensuring optimal lubrication, a high viscosity index is crucial for lubricants exposed to changing load or temperature conditions. Several studies suggest that an enormous improvement of the viscosity-temperature characteristics could be achieved by the application of dissolved CO 2 on various base oils. The direct link between the applied pressure and the lubricant viscosity offers the possibility of adjustable and thus tunable lubricants. The practical implementation of dissolved CO 2 as a viscosity index improver is investigated on a roller bearing test rig. The results indicate a significant reduction of power losses and show that it is possible to influence the friction condition in the rolling contact through viscosity adaptation.

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Section: Introductionsupporting

confidence: 76%

Section: Co 2 Saturation Via Pressure Vesselmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Practical Application of CO₂ as a Viscosity Index Improver for Lubricants

et al. 2016

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“…Pohrer et al . 21 found a significant change in viscosity after absorbing CO 2 but the change of viscosity could not affect the friction property. The possible explanation is that the friction test in their work was operating in boundary lubrication where viscosity of lubricants has almost no significant impact on friction.…”

Section: Introductionmentioning

confidence: 87%

A smart friction control strategy enabled by CO2 absorption and desorption

Hua

Björling

Grahn

et al. 2019

Sci Rep

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Intelligent control of friction is an attractive but challenging topic and it has rarely been investigated for full size engineering applications. In this work, it is instigated if it would be possible to adjust friction by controlling viscosity in a lubricated contact. By exploiting the ability to adjust the viscosity of the switchable ionic liquids, 1,8-Diazabicyclo (5.4.0) undec-7-ene (DBU)/ glycerol mixture via the addition of CO2, the friction could be controlled in the elastohydrodynamic lubrication (EHL) regime. The friction decreased with increasing the amount of CO2 to the lubricant and increased after partial releasing CO2. As CO2 was absorbed by the liquid, the viscosity of the liquid increased which resulted in that the film thickness increased. At the same time the pressure-viscosity coefficient decreased with the addition of CO2. When CO2 was released again the friction increased and it was thus possible to control friction by adding or removing CO2.

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Measurement of Hydrogen Solubility in Potential Liquid Organic Hydrogen Carriers

Aslam¹,

Müller²,

Müller³

et al. 2015

J. Chem. Eng. Data

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Liquid organic hydrogen carriers (LOHC) are potential compounds that can facilitate chemical energy storage and hydrogen logistics using reversible hydrogenation. For the process development, the physical solubility of hydrogen in potential LOHCs is required. In this work, solubility of hydrogen in the potential LOHC systems toluene/methylcyclohexane, N-ethylcarbazole/perhydro-Nethylcarbazole, and dibenzyltoluene/perhydrodibenzyltoluene was measured using the static isochoric saturation method. The data were measured at low pressures up to 10 bar within the temperature range of (293 to 373) K. Hydrogen solubility in hydrogenated forms of the LOHCs was found to be higher compared to the dehydrogenated forms. Solubility in all substances increased with increasing temperature within the whole temperature range under consideration. The temperature dependency of the Henry coefficient of hydrogen in the solvents was correlated using the Benson and Krause correlation.

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CO₂ as a Viscosity Index Improver for Wind Turbine Oils

Abstract: In all experiments CDCl 3 was chosen as internal standard. In the following listed data the chemical shifts are given in parts per million (ppm) and the coupling constants in Hz.

Cited by 4 publications

References 50 publications

Practical Application of CO₂ as a Viscosity Index Improver for Lubricants

Practical Application of CO₂ as a Viscosity Index Improver for Lubricants

A smart friction control strategy enabled by CO2 absorption and desorption

Measurement of Hydrogen Solubility in Potential Liquid Organic Hydrogen Carriers

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CO2 as a Viscosity Index Improver for Wind Turbine Oils

Abstract: In all experiments CDCl 3 was chosen as internal standard. In the following listed data the chemical shifts are given in parts per million (ppm) and the coupling constants in Hz.

Cited by 4 publications

References 50 publications

Practical Application of CO2 as a Viscosity Index Improver for Lubricants

Practical Application of CO2 as a Viscosity Index Improver for Lubricants

A smart friction control strategy enabled by CO2 absorption and desorption

Measurement of Hydrogen Solubility in Potential Liquid Organic Hydrogen Carriers

Contact Info

Product

Resources

About

CO₂ as a Viscosity Index Improver for Wind Turbine Oils

Practical Application of CO₂ as a Viscosity Index Improver for Lubricants

Practical Application of CO₂ as a Viscosity Index Improver for Lubricants