<?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>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822022000400003</article-id>
<article-id pub-id-type="doi">10.18845/tm.v35i4.5822</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Determinación óptima en la extracción de hemicelulosas de elevada calidad del aserrín de Eucalyptus sp., a través de tratamiento hidrotérmico]]></article-title>
<article-title xml:lang="en"><![CDATA[Optimal determination in the extraction of hemicelluloses of high quality from Eucalyptus sp. sawdust, through hydrothermal treatment]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Albarrán-Molina]]></surname>
<given-names><![CDATA[Eyra Maria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel]]></surname>
<given-names><![CDATA[Jesus]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de los Andes  ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de los Andes  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>35</volume>
<numero>4</numero>
<fpage>3</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822022000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822022000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822022000400003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las astillas de Eucalyptus sp, son uno de los residuos o subproductos más importantes que se obtienen de la transformación primaria de la madera en diversas regiones a nivel mundial (12). Su principal uso es la producción de energía (13). Al ser sometido a condiciones de tratamiento hidrotérmico para la extracción de las hemicelulosas se pueden extraer las sustancias solubles en agua (17), quedando una fracción sólida de celulosa y lignina que seguirán otros procesos de separación y uso (11). El material residual que se utilizó es una mezcla de Eucalyptus rostrata, E. grandis y E. saligna con edades entre los 12 a 50 años, obtenido en uno de los aserraderos de la región. La muestra que se empleó en las corridas experimentales comprende la fracción que pasa por los 20 mesh y queda retenidaen 80 mesh dentro de un tamiz manual Zonytest. Inicialmente se aplicó un diseño factorial para verificar la influencia del tiempo (30, 45 y 60 min), la temperatura (120, 150 y 180°C) y relación líquido/sólido (5, 10, 15). Esta última variable resultó no significativa. Posteriormente se utilizó un diseño de optimización tipo Central Compuesto Centrado en las Caras, variando el tiempo (20, 30 y 40 min) y la temperatura (170, 180 y 190°C). Los tratamientos se realizaron en digestores de 200mL en baño de glicerina. El mejor punto obtenido se validó con un cambio de escala en un digestor de 4.6 L, con una camisa de calefacción y un sistema especial de agitación. La temperatura resultó ser el factor más influyente sobre el pretratamiento de autohidrólisis del aserrín. La mayor extracción de hemicelulosas (89% de las hemicelulosas iniciales) se obtuvo a 190°C y 20 min, sin embargo para minimizar la generación de furfural mediante la optimización de múltiples respuestas, la mejor condición resultó 180°C y 20 min. La superficie de respuesta muestra que podrían alcanzarse resultados similares a 170°C si se prolonga el tiempo de tratamiento a 50 min.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Eucalyptus sp chips are one of the most important residues or by-products obtained from primary wood processing in the various regions worldwide (12). Its main use is the production of energy (13). When subjected to hydrothermal treatment conditions for the extraction of the hemicelluloses can extract the substances soluble in wáter (17), leaving a solid fraction of cellulose and lignin that will follow other processes of separation and use (11). The waste material used was a mixture of Eucalyptusrostrata, E. grandis and E. Saligna with ages between 12 and 50 years, obtained in one of the sawmills of the region. The sample that was used in the experimental runs comprises the fraction that passes through the 20 mesh and is retained in 80 mesh inside a Zonytest manual sieve. Initially, a factorial design was applied to verify the influence of time (30, 45 and 60 min), temperature (120, 150 and 180 ° C) and liquid / solid ratio (5, 10, 15). This last variable was not significant. Afterwards, an optimization design was applied to the composite centered in the faces, varying the time (20, 30 and 40 min) and temperature (170, 180 and 190 ° C). The treatments were carried out in 200mL digesters in a glycerin bath. The best point obtained was validated with a scale change in a 4.6 L digester, with a heating jacket and a special stirring system. Temperature proved to be the most influential factor in the pretreatment of autohydrolysis of sawdust. The highest extraction of hemicelluloses (89% of initial hemicelluloses) was obtained at 190 ° C and 20 min, however to minimize the generation of furfural by optimizing multiple responses, the best condition was 180 ° C and 20 min. The response surface shows that similar results could be achieved at 170 ° C if the treatment time is extended to 50 min.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Eucalyptus]]></kwd>
<kwd lng="es"><![CDATA[biorefinería]]></kwd>
<kwd lng="es"><![CDATA[fraccionamiento]]></kwd>
<kwd lng="es"><![CDATA[autohidrólisis]]></kwd>
<kwd lng="es"><![CDATA[hemicelulosas]]></kwd>
<kwd lng="en"><![CDATA[Eucalyptus]]></kwd>
<kwd lng="en"><![CDATA[biorefinery]]></kwd>
<kwd lng="en"><![CDATA[fractionation]]></kwd>
<kwd lng="en"><![CDATA[autohydrolysis]]></kwd>
<kwd lng="en"><![CDATA[hemicelluloses]]></kwd>
</kwd-group>
</article-meta>
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