<?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>0120-100X</journal-id>
<journal-title><![CDATA[Revista ION]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. ion]]></abbrev-journal-title>
<issn>0120-100X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-100X2016000200125</article-id>
<article-id pub-id-type="doi">10.18273/revion.v29n2-2016010</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Solubility of Urea in ethanol-water mixtures and pure ethanol from 278.1K to 333.1K]]></article-title>
<article-title xml:lang="es"><![CDATA[Solubilidad de Urea en mezclas de etanol-agua y etanol puro a temperaturas de 278,1K a 333,1K]]></article-title>
<article-title xml:lang="pt"><![CDATA[Solubilidade da Ureia em misturas de etanol-água e em etanol puro em temperaturas de 278,1K a 333,1K]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva Capuci]]></surname>
<given-names><![CDATA[Ana Paula]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Noemy D. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco Jr]]></surname>
<given-names><![CDATA[Moilton R]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Malagoni]]></surname>
<given-names><![CDATA[Ricardo A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Uberlândia Chemical Engineering Faculty ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Uberlândia Campus Santa Mônica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>125</fpage>
<lpage>133</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-100X2016000200125&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-100X2016000200125&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-100X2016000200125&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper deals with the solubility of urea in ethanol-water mixtures in mole fractions of ethanol between 0.0901 and 1.000 at temperatures ranging from 278.1 to 333.1K. The investigation of solubility contributes to research in many others fields of study in chemical engineering, since there are several studies where the solubility of urea and its behavior in solution influence the system. The experiment was carried out at constant temperature, stirring for 2h and then leaving the solution at rest for 2h. After collecting the data, the solubility of urea was calculated based on the gravimetric method. The experimental results obtained were correlated with the temperature of the solvents using three equations based on the literature. The three models demonstrated results in line with the experimental data. It was observed that adding ethanol to the water decreased urea solubility in all cases. The differences between the predicted and the experimental values were on average 4.7%.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este artículo trata de la solubilidad de la urea en mezclas de etanol-agua en fracciones molares de etanol entre 0,0901 y 1,000 a temperaturas de 278,2 a 333,2K. La investigación de la solubilidad contribuye en muchos estudios en muchos otros campos de estudio en ingeniería química, ya que hay varios estudios en que la solubilidad de la urea y su comportamiento en solución influyen en el sistema. El experimento se llevó a cabo a temperatura constante, se agitó durante 2h y en seguida la solución se dejó en reposo también por 2h. Después de recoger los datos, la solubilidad de la urea se calculó basándose en el método gravimétrico. Los resultados experimentales obtenidos se correlacionaron con la temperatura de los disolventes usando tres ecuaciones basadas en la literatura. Los modelos han demostrado resultados en línea con los datos experimentales. Se observó que la adición de etanol al agua disminuye la solubilidad de la urea en todos los casos. Las diferencias entre los predichos y los valores experimentales fueron en promedio de 4,7%.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Este artigo trata da solubilidade de uréia em misturas de etanol-água em frações molares de etanol entre 0,0901 e 1,000 e temperaturas que variam de 278,1 a 333,1K. A investigação de solubilidade contribui para a pesquisa em muitos outros campos de estudo em engenharia química, uma vez que há vários estudos em que a solubilidade da ureia e o seu comportamento em solução influenciam o sistema. O experimento foi realizado a uma temperatura constante com agitação de 2h e, em seguida, deixando a solução em repouso durante 2h. Depois de recolher os dados, a solubilidade da ureia foi calculada com base no método gravimétrico. Os resultados experimentais obtidos foram correlacionados com a temperatura dos solventes utilizando três equações com base na literatura. Os três modelos demonstraram resultados condizentes com os dados experimentais. Observou-se que a adição de etanol na mistura provoca diminuição na solubilidade ureia em todos os casos. As diferenças entre os valores previsto e os experimentais foram, em média, 4,7%.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[urea]]></kwd>
<kwd lng="en"><![CDATA[ethanol]]></kwd>
<kwd lng="en"><![CDATA[gravimetric method]]></kwd>
<kwd lng="en"><![CDATA[solubility]]></kwd>
<kwd lng="es"><![CDATA[etanol]]></kwd>
<kwd lng="es"><![CDATA[método gravimétrico]]></kwd>
<kwd lng="es"><![CDATA[solubilidad]]></kwd>
<kwd lng="pt"><![CDATA[uréia]]></kwd>
<kwd lng="pt"><![CDATA[etanol]]></kwd>
<kwd lng="pt"><![CDATA[método gravimétrico]]></kwd>
<kwd lng="pt"><![CDATA[solubilidade.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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