Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene
Linear low density polyethylene of low polidispersivity index could be obtained by hydrogenating low polidispersivity index polybutadienes (PBs). In conventional hydrogenation processes, the system always presents, at least, two fluid phases during the reaction progress. The presence of an interp...
| Autores principales: | , , , , , , , |
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| Formato: | Documento de conferencia publishedVersion docunento de conferencia |
| Lenguaje: | Inglés |
| Publicado: |
Prosciba IV Iberoamerican Conference of SuperCritical Fluids - Viña del Mar, Chile.
2018
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12272/2972 |
| Aporte de: |
| id |
I68-R174-20.500.12272-2972 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Tecnológica Nacional |
| institution_str |
I-68 |
| repository_str |
R-174 |
| collection |
RIA - Repositorio Institucional Abierto (UTN) |
| language |
Inglés |
| topic |
Polybutadiene, supercritical, hydrogenation |
| spellingShingle |
Polybutadiene, supercritical, hydrogenation Menossi, Matias Hegel, P. E. Milanesio, J. M. Andreatta, Alfonsina E. Ciolino, Andrés Quinzani, L. M. Rovetto, Laura J. Zabaloy, Marcelo S. Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| topic_facet |
Polybutadiene, supercritical, hydrogenation |
| description |
Linear low density polyethylene of low polidispersivity index could be obtained by hydrogenating
low polidispersivity index polybutadienes (PBs). In conventional hydrogenation processes, the
system always presents, at least, two fluid phases during the reaction progress. The presence of an
interphase implies lower mass transfer rates. This could be overcome by using a supercritical fluid
as reaction medium, so that the hydrogenation process occurs, in principle, under single fluid
phase conditions. To hydrogenate the PB under supercritical conditions, the solvent (or solvent
mixture) should be able to simultaneously dissolve the PB, the hydrogen and the reaction
products. The high asymmetry of the reactive mixture, which is in part due to the large difference
in size between the H2 and PB molecules, implies a high immiscibility level in the absence of the
supercritical solvent or solvent mixture. In particular, the ‘PB + solvent mixture’ system should
be homogeneous at the conditions of temperature, pressure and PB concentration range at which
the PB hydrogenation is to be carried out. The purpose of this work is to experimentally find the
conditions under which a number of ‘PB + solvent mixture’ systems, and related subsystems, are
homogeneous. In a typical experiment, an in-house constant volume cell is loaded with a known
amount of a known composition mixture. Next, the pressure is measured at set temperature,
covering the temperature range of interest. Clearly, the measured and recorded pressure versus
temperature curve is an isopleth (constant overall composition) and it is also an isochor (constant
overall density). Slope changes in the curve imply changes in the phase condition, i.e., this
experimental technique also provides saturation conditions. At high enough temperature, the
system becomes homogeneous, and it remains so at higher temperatures. Pressure vs Temperature
isochoric-isoplethic trajectories were measured in this work for a number of pure solvents, solvent
mixtures, and systems made of PB and a solvent mixture. The experiments were performed at
varying overall density and varying overall mixture composition. |
| format |
Documento de conferencia publishedVersion docunento de conferencia |
| author |
Menossi, Matias Hegel, P. E. Milanesio, J. M. Andreatta, Alfonsina E. Ciolino, Andrés Quinzani, L. M. Rovetto, Laura J. Zabaloy, Marcelo S. |
| author_facet |
Menossi, Matias Hegel, P. E. Milanesio, J. M. Andreatta, Alfonsina E. Ciolino, Andrés Quinzani, L. M. Rovetto, Laura J. Zabaloy, Marcelo S. |
| author_sort |
Menossi, Matias |
| title |
Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| title_short |
Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| title_full |
Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| title_fullStr |
Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| title_full_unstemmed |
Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| title_sort |
experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene |
| publisher |
Prosciba IV Iberoamerican Conference of SuperCritical Fluids - Viña del Mar, Chile. |
| publishDate |
2018 |
| url |
http://hdl.handle.net/20.500.12272/2972 |
| work_keys_str_mv |
AT menossimatias experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT hegelpe experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT milanesiojm experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT andreattaalfonsinae experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT ciolinoandres experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT quinzanilm experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT rovettolauraj experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene AT zabaloymarcelos experimentalpressureversustemperatureisochoricisoplethiccurvesforsystemsrelatedtothesupercriticalhydrogenationofpolybutadiene |
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Repositorios |
| _version_ |
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