<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1665-2738</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Ing. Quím]]></abbrev-journal-title>
<issn>1665-2738</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-27382008000200003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio del fenómeno de expansión-contracción del lecho en reactores de lecho ebullente usando el análisis dimensional y la teoría de modelos]]></article-title>
<article-title xml:lang="en"><![CDATA[Study of bed expansion-contraction phenomenon in ebullated-bed reactors based on dimensional analysis and model theory]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-López]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Martinez]]></surname>
<given-names><![CDATA[R. S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso-Martínez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ancheyta-Juárez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana Área de Ingeniería Química Unidad Iztapalapa]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Mexicano del Petróleo  ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Tecnológico de Ciudad Madero  ]]></institution>
<addr-line><![CDATA[Cd. Madero Tamaulipas]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<volume>7</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>122</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382008000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382008000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382008000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Un enfoque acerca del escalamiento hidrodinámico para lechos fluidizados de tres fases reportado por Safoniuk y col. (1999) fue evaluado para sistemas operados a alta presión y alta temperatura. El método mencionado, basado en conceptos de análisis dimensional y teoría de modelos, sugiere el uso de un conjunto de cinco grupos adimensionales que deben ser igualados para asegurar la semejanza hidrodinámica entre dos unidades experimentales separadas que difieren tanto en su geometría como en sus condiciones de operación. Con la ayuda de estos conceptos, en el presente trabajo se llevaron a cabo experimentos en un sistema operado a presión atmosférica para simular el comportamiento hidrodinámico de un sistema de lecho ebullente operado a condiciones severas. La porosidad del lecho y el fenómeno de expansión-contracción fueron comparados en ambos sistemas. Sobre bases estadísticas, se observó una apropiada comparación entre la porosidad del lecho en ambas unidades.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The hydrodynamics scale-up approach reported by Safoniuk et al. (1999) for three-phase fluidized beds has been evaluated when applied for high pressure and temperature systems. The aforementioned method, which is based on dimensional analysis concepts and model theory, suggests the use of a set of five dimensionless groups that must be matched to ensure hydrodynamic similarity between two separate experimental units that differ both geometrically and in the operating conditions. With the aid of these concepts, in the present work experiments have been carried out with a system operated at atmospheric pressure to simulate the hydrodynamics of an ebullated-bed system operated under severe conditions. The bed porosity and the bed expansion-contraction phenomena have been compared for both systems. On a statistical basis, a good agreement between the bed porosities of both units was observed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[lecho ebullente]]></kwd>
<kwd lng="es"><![CDATA[hidrodinámica]]></kwd>
<kwd lng="es"><![CDATA[escalamiento]]></kwd>
<kwd lng="es"><![CDATA[semejanza]]></kwd>
<kwd lng="es"><![CDATA[alta presión]]></kwd>
<kwd lng="en"><![CDATA[ebullated-bed]]></kwd>
<kwd lng="en"><![CDATA[hydrodynamics]]></kwd>
<kwd lng="en"><![CDATA[scale-up]]></kwd>
<kwd lng="en"><![CDATA[similarity]]></kwd>
<kwd lng="en"><![CDATA[high pressure]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Cat&aacute;lisis, cin&eacute;tica y reactores</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Estudio del fen&oacute;meno de expansi&oacute;n&#150;contracci&oacute;n del lecho en reactores de lecho ebullente usando el an&aacute;lisis dimensional y la teor&iacute;a de modelos</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Study of bed expansion&#150;contraction phenomenon in ebullated&#150;bed reactors based on dimensional analysis and model theory</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J. L. S&aacute;nchez&#150;L&oacute;pez<sup>l</sup>, R. S. Ruiz&#150;Martinez<sup>l</sup>*, F. Alonso&#150;Mart&iacute;nez<sup>2,<sup>3</sup></sup> y J. Ancheyta&#150;Ju&aacute;rez<sup>3</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> &Aacute;rea de Ingenier&iacute;a Qu&iacute;mica, Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa. Av. San Rafael Atlixco 186, Col. Vicentina, CP 09360, M&eacute;xico, D.F. <i>*Autor para la correspondencia. E&#150;mail: </i></i><a href="mailto:rmr@xanum.uam.mx">rmr@xanum.uam.mx</a>.<i><i> Tel.: 5804&#150;4648, Fax.:5804&#150;4900</i></i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto Mexicano del Petr&oacute;leo; Eje Central L&aacute;zaro C&aacute;rdenas No. 152 Col. San Bartolo Atepehuaca, M&eacute;xico, D.F. </i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Instituto Tecnol&oacute;gico de Ciudad Madero, Av. 1o. de Mayo esq. Sor Juana In&eacute;s de la Cruz s/n Col. los Mangos, Cd. Madero Tamaulipas, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido 20 de Marzo 2007    <br> Aceptado 18 de Junio 2008</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Un enfoque acerca del escalamiento hidrodin&aacute;mico para lechos fluidizados de tres fases reportado por Safoniuk <i>y col. </i>(1999) fue evaluado para sistemas operados a alta presi&oacute;n y alta temperatura. El m&eacute;todo mencionado, basado en conceptos de an&aacute;lisis dimensional y teor&iacute;a de modelos, sugiere el uso de un conjunto de cinco grupos adimensionales que deben ser igualados para asegurar la semejanza hidrodin&aacute;mica entre dos unidades experimentales separadas que difieren tanto en su geometr&iacute;a como en sus condiciones de operaci&oacute;n. Con la ayuda de estos conceptos, en el presente trabajo se llevaron a cabo experimentos en un sistema operado a presi&oacute;n atmosf&eacute;rica para simular el comportamiento hidrodin&aacute;mico de un sistema de lecho ebullente operado a condiciones severas. La porosidad del lecho y el fen&oacute;meno de expansi&oacute;n&#150;contracci&oacute;n fueron comparados en ambos sistemas. Sobre bases estad&iacute;sticas, se observ&oacute; una apropiada comparaci&oacute;n entre la porosidad del lecho en ambas unidades.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>lecho ebullente, hidrodin&aacute;mica, escalamiento, semejanza, alta presi&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">The hydrodynamics scale&#150;up approach reported by Safoniuk <i>et al. </i>(1999) for three&#150;phase fluidized beds has been evaluated when applied for high pressure and temperature systems. The aforementioned method, which is based on dimensional analysis concepts and model theory, suggests the use of a set of five dimensionless groups that must be matched to ensure hydrodynamic similarity between two separate experimental units that differ both geometrically and in the operating conditions. With the aid of these concepts, in the present work experiments have been carried out with a system operated at atmospheric pressure to simulate the hydrodynamics of an ebullated&#150;bed system operated under severe conditions. The bed porosity and the bed expansion&#150;contraction phenomena have been compared for both systems. On a statistical basis, a good agreement between the bed porosities of both units was observed.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>ebullated&#150;bed; hydrodynamics; scale&#150;up; similarity; high pressure.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmiq/v7n2/v7n2a3.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a> </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Se agradece el apoyo del Instituto Mexicano del Petr&oacute;leo para la realizaci&oacute;n de este trabajo.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">National Institute of Standards and Technology (NIST) (2005). 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