Destabilization‐Enhanced Centrifugation of Metalworking Oil‐in‐Water Emulsions: Effect of Demulsifying Agents

Allende, David; Cambiella, Ángel; Benito, José M.; Pazos, Carmen; Coca, José

doi:10.1002/ceat.200700018

Cited by 36 publications

(21 citation statements)

References 26 publications

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“…The optical reading head scans the height of the sample in the cell (about 40 mm), by acquiring transmission and backscattering data every 40 μm. Transmitted and backscattered light were monitored as a function of time and cell height for 35 days at 25 °C [ 45 , 46 ].…”

Section: Methodsmentioning

confidence: 99%

Formulation and Preparation of Water-In-Oil-In-Water Emulsions Loaded with a Phenolic-Rich Inner Aqueous Phase by Application of High Energy Emulsification Methods

Niknam

Escudero

Benito

2020

Foods

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Currently, industry is requesting proven techniques that allow the use of encapsulated polyphenols, rather than free molecules, to improve their stability and bioavailability. Response surface methodology (RSM) was applied in this work to determine the optimal composition and operating conditions for preparation of water-in-oil-in-water (W/O/W) emulsions loaded with phenolic rich inner aqueous phase from olive mill wastewater. A rotor-stator mixer, an ultrasonic homogenizer and a microfluidizer processor were tested in this study as high-energy emulsification methods. Optimum results were obtained by means of microfluidizer with 148 MPa and seven cycles input levels yielding droplets of 105.3 ± 3.2 nm in average size and 0.233 ± 0.020 of polydispersity index. ζ-potential, chemical and physical stability of the optimal W/O/W emulsion were also evaluated after storage. No droplet size growth or changes in stability and ζ-potential were observed. Furthermore, a satisfactory level of phenolics retention (68.6%) and antioxidant activity (89.5%) after 35 days of storage at room temperature makes it suitable for application in the food industry.

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Section: Methodsmentioning

confidence: 99%

Formulation and Preparation of Water-In-Oil-In-Water Emulsions Loaded with a Phenolic-Rich Inner Aqueous Phase by Application of High Energy Emulsification Methods

Niknam

Escudero

Benito

2020

Foods

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“…Measurements were carried out until 40 days at 20°C to determine the predominant mechanism of destabilization in each emulsion as well as the kinetics of the destabilization process. MLS is a sensitive and nonintrusive technique to monitor physical stability of emulsions and more complex systems such as suspoemulsions …”

Section: Methodsmentioning

confidence: 99%

Physical characterization of eco‐friendly O/W emulsions developed through a strategy based on product engineering principles

et al. 2014

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Many traditional industrial products are being gradually replaced by environmental friendly alternatives. N,N-Dimethyldecanamide and D-limonene are solvents that fulfil the requirements to be considered green solvents and may find application in agrochemicals. This contribution deals with the study of emulsions formulated with a mixture of these solvents and an eco-friendly emulsifier. The procedure followed for the development of these formulations was based on the application of product design principles. This led to the optimum homogenization rate and subsequently to the optimum ratio of solvents. The combination of different techniques (rheology, laser diffraction, confocal laser-scanning microscopy, and multiple light scattering) was demonstrated to be a powerful tool to assist in the prediction of the emulsions destabilization process. Thus, we found that the optimum ratio of solvents was 75/25 (N,N-dimethyldecanamide/D-limonene) on account of the lack of coalescence and of a low creaming rate.Standard deviation of the mean (three replicates) for D 2,3 < 5%. Standard deviation of the mean (three replicates) for uniformity < 5%.

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“…Both membranes are very cheap, and chemically and mechanically resistant. As a result, the synthesized mullite and mullite-alumina ceramic membranes in a hybrid MF-PAC can be employed for treatment of oily wastewaters and their permeates can further be treated by UF or RO process [15,16].…”

Section: Comparison Of Mullite and Mullite-alumina Ceramic Membranesmentioning

confidence: 99%

Enhancement of Oily Wastewater Treatment by Ceramic Microfiltration Membranes using Powder Activated Carbon

2011

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Results of a hybrid microfiltration-powdered activated carbon (MF-PAC) system for the treatment of synthetic oily wastewaters with mullite and mullite-alumina (50 % alumina content) ceramic membranes are presented. The experiments were conducted to determine the effects of the presence of PAC on MF process performance in terms of flux decline, membrane fouling, and total organic carbon (TOC) rejection. The experimental results demonstrate that PAC addition at low concentration (200-400 ppm) increases permeate flux by 19.6 % for mullite and 61 % for mullite-alumina MF membranes. However, high PAC concentration (1200 ppm) decreases the permeate flux by 22 % for mullite and 25 % for mullitealumina MF membranes. Also, TOC rejection increases from 93.8 to 97.4 % for mullite and from 89.6 to 92.4 % for mullite-alumina MF membranes. IntroductionLow pressure driven membrane separation techniques such as microfiltration (MF) have been considered as indispensable treatment methods in water and wastewater treatment applications to remove specific pollutants which are not normally removed by conventional processes. MF is excellent in removing microparticles, microorganisms, macromolecules, and most bacteria [1]. Ceramic membranes have numerous advantages: stability at high temperature and pressure resistance, good chemical stability, high mechanical resistance, long life, and good antifouling properties. Ceramic MF membranes can be made from alumina, mullite, cordierite, silica, spinel, zirconia, and other refractory oxides. Among these membranes, mullite ceramic membranes have very high chemical and thermal stability, and are very cheap because they can be prepared by extruding and calcining kaolin clay [2].Membrane fouling is characterized, in general, as the reduction of permeate flux through the membrane and, hence, leads to an irreversible loss of system productivity over time, caused by interactions between the membrane and the various components in the process stream. To reduce membrane fouling, some methods can be used. Using adsorbents as pretreatment is one way to minimize membrane fouling. Powdered activated carbon (PAC) 1) has the ability to adsorb primarily the lower molecular weight organic compounds and shows more affinity towards the hydrophobic components. Adsorption using PAC in combination with the membrane MF process can be used as a hybrid system for removing organic materials and improving permeate flux. PAC is generally used as a pretreatment step prior to the membrane operation or in combination with the membrane in a feed tank [3].PAC has been used as membrane pretreatment for both water and wastewater treatment. Kim et al. [4] showed that using PAC with polymeric MF membranes to treat lake water reduces the fouling rate by removing natural organic matter (NOM), compared with the system with no adsorbent. Ince et al. [5] used PAC and polymer membranes in a hybrid system to further reduce the chemical oxygen demand (COD) concentration of the jet-loop membrane bioreactor effluent to meet the COD disc...

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Destabilization‐Enhanced Centrifugation of Metalworking Oil‐in‐Water Emulsions: Effect of Demulsifying Agents

Cited by 36 publications

References 26 publications

Formulation and Preparation of Water-In-Oil-In-Water Emulsions Loaded with a Phenolic-Rich Inner Aqueous Phase by Application of High Energy Emulsification Methods

Formulation and Preparation of Water-In-Oil-In-Water Emulsions Loaded with a Phenolic-Rich Inner Aqueous Phase by Application of High Energy Emulsification Methods

Physical characterization of eco‐friendly O/W emulsions developed through a strategy based on product engineering principles

Enhancement of Oily Wastewater Treatment by Ceramic Microfiltration Membranes using Powder Activated Carbon

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