Search results for "stil"
showing 10 items of 1452 documents
Isobaric Vapor−Liquid Equilibria for Binary and Ternary Mixtures of Diisopropyl Ether, 2-Propyl Alcohol, and 3-Methyl-1-Butanol
2008
Consistent vapor−liquid equilibrium data for the binary and ternary systems diisopropyl ether (1) + 2-propyl alcohol (2) + 3-methyl-1-butanol (3) are reported at 101.3 kPa. The diisopropyl ether (1) + 3-methyl-1-butanol (3) system shows positive deviations from ideal behavior, and the 2-propyl alcohol (2) + 3-methyl-1-butanol (3) system exhibits slight deviations from ideal behavior. The activity coefficients and the boiling points were correlated with their compositions by the Wilson, NRTL, UNIQUAC, and Wisniak−Tamir equations. It is shown that these models allow a very good prediction of the phase equilibria of the ternary system using the pertinent parameters of the binary systems. 3-Met…
Phase equilibria involved in extractive distillation of dipropyl ether+1-propyl alcohol using 2-ethoxyethanol as entrainer
2007
Abstract Consistent vapour–liquid equilibrium data at 101.3 kPa have been determined for the ternary system dipropyl ether + 1-propyl alcohol + 2-ethoxyethanol and two constituent binary systems: dipropyl ether + 2-ethoxyethanol and 1-propyl alcohol + 2-ethoxyethanol. The dipropyl ether + 2-ethoxyethanol system shows positive deviations from ideal behaviour and 1-propyl alcohol + 2-ethoxyethanol system exhibits no deviation from ideal behaviour. The activity coefficients and the boiling points were correlated with their compositions by the Wilson, NRTL and UNIQUAC equations. It is shown that the models allow a very good prediction of the phase equilibria of the ternary system using the pert…
Vapor–liquid equilibria in the ternary system dipropyl ether+1-propanol+1-pentanol and the binary systems dipropyl ether+1-pentanol, 1-propanol+1-pen…
2006
Abstract Consistent vapor–liquid equilibrium (VLE) data at 101.3 kPa have been determined for the ternary system dipropyl ether (DPE) + 1-propanol (PA) + 1-pentanol and two constituent binary systems: DPE + 1-pentanol and PA + 1-pentanol. The DPE + 1-pentanol system shows positive deviations from ideal behaviour and PA + 1-pentanol system exhibits no deviation from ideal behaviour. The activity coefficients and the boiling points were correlated with their compositions by the Wilson, NRTL, UNIQUAC and Wisniak–Tamir equations. It is shown that the models allow a very good prediction of the phase equilibria of the ternary system using the pertinent parameters of the binary systems. 1-Pentanol…
1-Ethyl-3-methylimidazolium Dicyanamide as a Very Efficient Entrainer for the Extractive Distillation of the Acetone + Methanol System
2012
Isobaric vapor–liquid equilibria (VLE) for the ternary system acetone + methanol +1-ethyl-3-methylimidazolium dicyanamide ([emim][DCA]) as well as the two solvent + IL binary systems have been obtained at 100 kPa using a recirculating still. The addition of [emim][DCA] to the solvent mixture produced a salting-out effect greater than that produced by other ionic liquids, showing that this ionic liquid is, until now, the best IL tested as an entrainer for the extractive distillation of the acetone + methanol mixtures, causing the azeotrope to disappear for an ionic liquid mole fraction as low as 0.031, at 100 kPa. This behavior can be explained on the basis of the influence of the IL concent…
Phase Equilibria Involved in Extractive Distillation of Dipropyl Ether + 1-Propyl Alcohol Using N,N-Dimethylformamide as Entrainer
2007
Consistent vapor−liquid equilibrium data for the binary and ternary systems dipropyl ether (1) + 1-propyl alcohol (2) + N,N-dimethylformamide (3) are reported at 101.3 kPa. The results indicate that dipropyl ether (1) + N,N-dimethylformamide (3) system exhibits a positive deviation from ideal behavior and that 1-propyl alcohol (2) + N,N-dimethylformamide (3) system deviates negatively from ideality. The activity coefficients of the solutions were correlated by the Wilson, NRTL, and UNIQUAC models. It is shown that these models allow a very good prediction of the phase equilibrium of the ternary system using the pertinent parameters of the binary systems. In addition, the Wisniak−Tamir relat…
Consumo alcohólico y hábitos de cuidado de la salud en jóvenes de una comunidad urbana periférica
2002
En este trabajo se realiza un análisis estructural del consumo de bebidas alcohólicas en una muestra de 337 jóvenes seleccionada entre las 2129 personas comprendidas entre los 15 y los 29 años empadronadas en el barrio de Casablanca (distrito periférico de la ciudad de Zaragoza). Para obtener los datos de la investigación fue utilizado el cuestio¬nario de comportamientos saludables CS-94 elaborado por Herrero, Musitu y Gracia (I 996). Se describen los hábitos de consumo alcohólico en función del sexo y la edad, y se realizan análisis de varianza con la finalidad de encontrar posibles diferencias signi¬ficativas entre el consumo de alcohol, por un lado, y por otro, las variables estructura¬l…
La Adoración de los Magos. Imagen de la Epifanía en el arte de la Antigüedad
1992
Análisis e interpretación iconográfica de la Adoración de los magos en el arte de los primeros siglos. Como tipo iconográfico, la Adoración de los Magos es considerada en el momento y circunstancias en que fue creado y difundido, contrastándolo con sus homólogas paganas como tema de encuadre. Siguiendo los procedimientos de la iconografía-iconología tradicional, se explican intertextualmente representaciones pictóricas de las catacumbas, esculturas de los sarcófagos y otras manifestaciones. Su sentido es puesto en relación con textos de las Escrituras, la liturgia, sermones y tratados teológicos, dirigido todo hacia una comprensión hermenéutica. Iconographic analysis and interpretation of t…
Soluble and nuclear oestrogen receptor status of advanced endometrial cancer in relation to subsequent clinical prognosis
1987
Both soluble and nuclear oestrogen receptors have been measured in at least two separate sections from 72 endometrial cancers and 12 normal endometria. Concentration of oestrogen receptor is shown to be, in our hands, more meaningful when expressed per unit DNA than per unit protein, whether for soluble or nuclear receptor. Endometrial cancer cells from the central part of the tumour are shown to be receptor negative more frequently than those from peripheral tumour. Thus, in large cancers, biopsies from different areas are required before a tumour can be correctly designated as receptor positive, heterogeneous or receptor negative. The intratumoral variation of receptor status may relate t…
Early rehabilitation of cancer patients—An individual randomized stepped‐care stress‐management intervention
2018
Objective To evaluate the effects of an individual stepped-care stress-management intervention for cancer patients on cancer-related stress reactions (intrusion/avoidance), and secondarily on psychological distress (anxiety/depression) and emotional reactivity (impatience/hostility). Methods Consecutively 291 cancer patients were included in a randomized controlled intervention study. Patients randomized to the intervention who did not report clinically significant stress levels (n = 72) after the first counseling session participated in only one counseling session and a follow-up (Step 1). The remaining patients (n = 66) received an additional three to eight sessions, depending on individu…
The influence of family expressed emotion on the course of schizophrenia in a sample of Spanish patients. A two-year follow-up study.
1992
A sample of 60 Spanish schizophrenic patients was studied to ascertain the relationship between their relatives' expressed emotion (EE) and relapse at follow-up. The relatives' EE and patients' relapse were operationalised following Leff & Vaughn's criteria. At nine months a significant association was not found between the relatives' EE and relapse, but this association became significant on reclassifying the relatives' EE scores after decreasing to four points the cut-off point for critical comments. At 24 months no association was found between EE and relapse. There was a tendency for patients who interrupted their medication or who did not work to relapse more frequently, particular…