Nasiraee, Mohammad, et al. Advanced Powder Technology 32.5 (2021): 1463-1471.
Sorbitan trioleate (Span 85), a hydrophobic surfactant, has demonstrated significant potential in improving membrane performance for membrane distillation crystallization (MDC) applications. This study explored the use of Span 85 in polyvinylidene fluoride (PVDF) membranes, aiming to optimize the crystallization of calcium nitrate from aqueous solutions.
Span 85 was incorporated into PVDF membranes at varying concentrations (0-6 wt%) to enhance their hydrophobicity. The membrane performance was evaluated based on water contact angle, porosity, and crystallization efficiency. At an optimal concentration of 4%, Span 85 significantly increased the membrane's hydrophobicity, with a water contact angle of 95.7° and a porosity of 67.2%. These improvements led to a substantial increase in water flux during the membrane distillation process. Additionally, membranes with Span 85 exhibited superior performance in crystal formation, yielding a higher quantity of calcium nitrate crystals.
This work highlights the effectiveness of Span 85 in enhancing the membrane properties for MDC, making it a valuable additive in membrane preparation for various crystallization processes. Its ability to improve membrane hydrophobicity and performance in MD processes suggests potential for broader applications in industrial-scale crystallization and separation technologies.
Guo, Qiong, Virendra Singh, and Sven Holger Behrens. Langmuir 26.5 (2010): 3203-3207.
Sorbitan trioleate (Span 85), a nonionic surfactant, has been shown to significantly enhance the electrical conductivity of nonpolar liquids, such as hexane, without the need for ionizable groups. This study explored the conductivity effects of Span 85 in hexane using precision conductometry, light scattering, and Karl Fischer titration. The results revealed two distinct regimes of conductivity, with a transition occurring around the critical micelle concentration (cmc).
Below the cmc, the conductivity increases linearly with surfactant concentration, a behavior unlike that of typical ionic surfactants. Above the cmc, conductivity continues to rise linearly, analogous to systems with ionic surfactants, potentially due to charge disproportionation in reverse micelles. This suggests that the conductivity enhancement is driven by the surfactant itself rather than by ionic impurities.
The findings indicate that Span 85 can serve as a robust method for controlling conductivity in nonpolar solutions, especially in oil-phase systems in contact with water. The ability to regulate conductivity with nonionic surfactants opens new avenues for applications where charge screening and conductivity control are critical, such as in emulsions, lubricants, and other formulations requiring stable charge behavior.
Omer, Ali, and Rajinder Pal. Industrial & Engineering Chemistry Research 52.26 (2013): 9099-9105.
Sorbitan trioleate (Emsorb 2503) has been studied for its role in stabilizing water-in-oil (W/O) emulsions and its impact on the flow behavior of these emulsions in pipelines. When added at concentrations ranging from 0 to 2 wt% based on the oil phase, sorbitan trioleate significantly influences the rheological properties of W/O emulsions. The study demonstrated that increasing the surfactant concentration reduced the interfacial tension between water and oil, from 40.5 mN/m to 5.6 mN/m at 2 wt% surfactant. This reduction in interfacial tension promotes the formation of more stable emulsions.
Furthermore, sorbitan trioleate affects the transition from laminar to turbulent flow in pipelines. While water-in-oil emulsions without surfactant exhibited drag reduction behavior in turbulent flow, surfactant-stabilized emulsions showed a delay in the laminar-to-turbulent transition. This delay was dependent on the pipe diameter, with larger diameters exhibiting more pronounced effects. As the water concentration increased beyond 40%, phase inversion occurred, shifting the emulsion to oil-in-water (O/W), where the friction factor data followed the Blasius equation.
These findings suggest that sorbitan trioleate is an effective surfactant for improving the stability and flow behavior of water-in-oil emulsions in pipeline systems, particularly for applications where drag reduction and controlled flow transition are critical.
What is the CAS number for Sorbitan trioleate?
The CAS number for Sorbitan trioleate is 26266-58-0.
What are some synonyms for Sorbitan trioleate?
Some synonyms for Sorbitan trioleate are Span 85, Sorbitan, esters, tri-9-octadecenoate, Sorbitan, tri-(9Z)-9-octadecenoate, and Anhydro-D-glucitol trioleate.
What is the molecular weight of Sorbitan trioleate?
The molecular weight of Sorbitan trioleate is 957.49.
What is the melting point of Sorbitan trioleate?
The melting point of Sorbitan trioleate is -23 °C (lit.).
What is the flash point of Sorbitan trioleate?
The flash point of Sorbitan trioleate is 222.4°C.
What is the purity of Sorbitan trioleate?
The purity of Sorbitan trioleate is 98%+.
What is the density of Sorbitan trioleate?
The density of Sorbitan trioleate is 0.94g/ml.
What is the appearance of Sorbitan trioleate?
The appearance of Sorbitan trioleate is a yellow amber color to brown oily liquid that is odorless.
What percentage of actives does Sorbitan trioleate contain?
Sorbitan trioleate contains 95% actives.
What is the typical application of Sorbitan trioleate?
The typical application of Sorbitan trioleate is as an emulsifying agent.
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