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| 1 | Liquid-liquid interfacial tension of equilibrated mixtures of ionic liquids and hydrocarbons显示文摘Ionic liquids are possible alternative solvents for the separation of aromatic and aliphatic hydrocarbons by liquid-liquid extrac- tion. Interfacial tension is an important property to consider in the design of liquid-liquid extraction processes. In this work, the liquid-liquid interfacial tension and the mutual solubility at 25 °C have been measured for a series of biphasic, equilibrated mixtures of an ionic liquid and a hydrocarbon. In particular, the ionic liquids 1-alkyl-3-methylimidazolium bis(trifluorome- thanesulfonyl)imide (with the alkyl substituent being ethyl, hexyl or decyl), 1-ethyl-3-methylimidazolium ethylsulfate, and 1-ethyl-3-methylimidazolium methanesulfonate have been selected, as well as the hydrocarbons benzene, hexane, ethylben- zene, and octane. The selected sets of ionic liquids and hydrocarbons allow the analysis of the influence of a series of effects on the interfacial tension. For example, the interfacial tension decreases with an increase in the length of the alkyl substituent chain of the cation or with an increase of the degree of charge delocalisation in the anion of the ionic liquid. Also, the interfa- cial tension with the aromatic hydrocarbons is markedly lower than that with the aliphatic hydrocarbons. A smaller effect is caused by variation of the size of the hydrocarbon. Some of the observed trends can be explained from the mutual solubility of the hydrocarbon and the ionic liquid. | RODRíGUEZ Héctor ARCE Alberto SOTO Ana | 2012 | Science China Chemistry2012，55，8： | 4 |
| 2 | Analyzing predictors of graft survival in patients undergoing liver transplantation with donors aged 70 years and over显示文摘AIM To increase the number of available grafts.METHODS This is a single-center comparative analysis performed between April 1986 and May 2016. Two hundred and twelve liver transplantation(LT) were performed with donors ≥ 70 years old(study group). Then, we selected the first cases that were performed with donors < 70 years old immediately after the ones that were performed with donors ≥ 70 years old(control group).RESULTS Graft and patient survivals were similar between both groups without increasing the risk of complications, especially primary non-function, vascular complications and biliary complications. We identified 5 risk factors as independent predictors of graft survival: recipient hepatitis C virus(HCV)-positivity [hazard ratio(HR) = 2.35; 95% confidence interval(CI): 1.55-3.56; P = 0.00]; recipient age(HR = 1.04; 95%CI: 1.02-1.06; P = 0.00); donor age X model for end-stage liver disease(D-MELD)(HR = 1.00; 95%CI: 1.00-1.00; P = 0.00); donor value of serum glutamic-pyruvic transaminase(HR = 1.00; 95%CI: 1.00-1.00; P = 0.00); and donor value of serum sodium(HR = 0.96; 95%CI: 0.94-0.99; P = 0.00). After combining D-MELD and recipient age we obtained a new scoring system that we called DR-MELD(donor age X recipient age X MELD). Graft survival significantly decreased in patients with a DR-MELD score ≥ 75000, especially in HCV patients(77% vs 63% at 5 years in HCV-negative patients, P = 0.00; and 61% vs 25% at 5 years in HCV-positive patients; P = 0.00). CONCLUSION A DR-MELD ≥ 75000 must be avoided in order to obtain the best results in LT with donors ≥ 70 years old. | Oscar Caso-Maestro Carlos Jiménez-Romero Iago Justo-Alonso Jorge Calvo-Pulido David Lora-Pablos Alberto Marcacuzco-Quinto Félix Cambra-Molero Alvaro García-Sesma Marina Pérez-Flecha Carlos Munoz- Arce Carmelo Loinaz-Segurola Alejandro Manrique-Municio | 2018 | World Journal of Gastroenterology2018，24，47： | 2 |
| 3 | An inhibitor of urease activity effectively reduces ammonia emissions from soil treated with urea under Mediterranean conditions显示文摘 | Alberto Sanz-Cobena Thomas H. Misselbrook Augusto Arce Juan I. Mingot Jose Antonio Diez Antonio Vallejo | 2008 | Agriculture Ecosystems and Environment2008，，3： | 1 |
| 4 | Ionic liquids on desul- ftnization of fuel oils显示文摘 | Maria Francisco Alberto Arce Ana Soto | 2010 | Fluid Ptme Equilibris2010，294，12： | 1 |
| 5 | Activities of Aqueous Na+ and Cl^- Ions from Homoionic Measurements with Null Junction Potentials at Different Concentrations 显示文摘 | Alberto Arce Wilczek-Verac G Vera J H | 2007 | Chemical Engineering Science2007，62，： | 1 |
| 6 | An inhibitor of urease activity effectively reduces ammonia emissions from soil treated with urea under Mediterranean conditions显示文摘 | Alberto Sanz-Cobena Thomas H. Misselbrook Augusto Arce Juan I. Mingot Jose Antonio Diez Antonio Vallejo | 2008 | Agriculture Ecosystems and Environment2008，，3： | 1 |
| 7 | Separation of benzene and hexane by solvent extraction with 1 -Alky1-3 -methylimidazolium bis {(trifluoromethyl)sulfonyl}amide Ionic liquids: effect of the alkyl-substituent length 显示文摘 | ALBERTO Arce MARTYN J Earle HE'CTOR Rodrl'guez | 2007 | Phys Chem B2007，111，： | 1 |
| 8 | Partitioning ofantibiotics in a two-liquid phase system formed by waterand a room temperature ionic liquid显示文摘 | Ana Soto Alberto Arce MohammadK | 2005 | Separation andPurification Technology2005，44，3： | 1 |
| 9 | Nanofluid based on 1-dodecylpyridinium chloride for enhanced oil recovery显示文摘The use of nanoparticles is considered promising for enhanced oil recovery(EOR),especially when they are combined with surfactants.However,the combination of nano-sized material with surface-active ionic liquids(SAILs)is an unexplored EOR method.In this work,the advantages of mixing Al2O3 nanoparticles with the SAIL 1-dodecylpyridinium chloride were investigated.Stable nanofluids in brine could only be achieved using the polymer polyvinylpyrrolidone(PVP)as a stabilizing agent.It was found that the addition of nanoparticles(and PVP)to the surfactant formulation helped to:slightly increase its viscosity,enhance its water-oil interfacial tension(IFT)reduction capacity,and reduce the adsorption on carbonate rocks(adsorption on sandstone was found to be excessive).IFT was selected as target property to minimize for the design of EOR formulations.Core flooding tests were carried out with surfactant(0.5 wt%[C_(12)py]Cl),surfactant-polymer(0.5 wt%[C_(12)py]Cl,1.0 wt%PVP)and nanofluid(0.05 wt%Al_(2)O_(3),1.0 wt%PVP,0.5 wt%[C12py]Cl)formulations in brine(0.5 wt%NaCl).Additional oil recoveries of 3.4%,7.4%and 12.0%OOIP were achieved,respectively,the nanofluid formulation being the most promising for the application.Moreover,it was found capable of changing the wettability of carbonate rocks from oilwet to intermediate-wet.The significance of this work lies in showing the new possibilities resulting from the combination of SAILs and nanoparticles for EOR,specifically the combination of[C_(12)py]Cl with Al_(2)O_(3). | Akram Al-Asadi Alba Somoza Alberto Arce Eva Rodil Ana Soto | 2023 | Petroleum Science2023，20，1： | 0 |
| 10 | Oil recovery tests with ionic liquids: A review and evaluation of 1-decyl-3-methylimidazolium triflate显示文摘The main advantages of the use of ionic liquids in enhanced oil recovery are their tunability and stability in harsh environmental conditions. In this work, a comprehensive review of ionic liquids proposed to improve current chemical oil recovery methods has been presented, focusing on core flooding experiments. With an almost infinite number of possible ionic liquids, the amount of experiments carried out up to now has been very limited. However, results are promising, with additional recovery after secondary flooding of up to 32% of the original oil in place. Most formulations with ionic liquids have been proposed for sandstone reservoirs, the number of studies with carbonate cores being very scarce. The possibilities of a new room temperature surface active ionic liquid, 1-decyl-3-methylimidazolium triflate,for this application were analyzed. It was shown that it is able to drastically reduce the water/oil interfacial tension. An optimized formulation was proposed for carbonate reservoirs. After secondary flooding with brine, an additional recovery of 10.5% of original oil in place was achieved at room conditions. A combination of the proposed method followed by a polymer flooding step with polyacrylamide led to a lesser but still significant recovery, reducing the costs associated to the ionic liquid. | Alba Somoza Alberto Arce Ana Soto | 2022 | Petroleum Science2022，19，4： | 0 |
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