{"id":85004,"date":"2018-03-10T00:09:25","date_gmt":"2018-03-10T00:09:25","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudio-del-fraccionamiento-qua%c2%admico-de-la-madera-en-medio-acido-organicos\/"},"modified":"2018-03-10T00:09:25","modified_gmt":"2018-03-10T00:09:25","slug":"estudio-del-fraccionamiento-qua%c2%admico-de-la-madera-en-medio-acido-organicos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/estudio-del-fraccionamiento-qua%c2%admico-de-la-madera-en-medio-acido-organicos\/","title":{"rendered":"Estudio del fraccionamiento qu\u00edmico de la madera en medio \u00e1cido org\u00e1nicos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Severino Abad Peque\u00f1o <\/strong><\/h2>\n<p>Se aborda el estudio de la obtenci\u00f3n de pastas celul\u00f3sicas de elevada pureza a trav\u00e9s de procesos de deslignificaci\u00f3n de madera basados en el empleo de disolventes org\u00e1nicos seguidas de secuencias de etapas de blanqueo basadas en el empleo de compuestos totalmente libres de cloro, evalu\u00e1ndose su calidad por medio de par\u00e1metros qu\u00edmicos y f\u00edsicoquimicos.  como tecnolog\u00edas de deslignificaci\u00f3n se han seleccionado el proceso acetosolv (basado en el empleo de disoluciones concentradas de \u00e1cido ac\u00e9tico, catalizadas con peque\u00f1as cantidades de \u00e1cido clorh\u00eddirico), aplicado sobre la madera de eucalyptus globulus; y el milox (proceso multietapa basado en el empleo de disoluciones concentradas \u00e9cido f\u00f3rmico con la adici\u00f3n de peque\u00f1as cantidades de per\u00f3xido de hidr\u00f3geno), aplicado sobre la madera de eucalyptus globulus y una especie h\u00edbrida de populus tremula*tremuloides. para ambas tecnolog\u00edas se determinaron las composiciones de las pastas y de los licores en un amplio intervalo de condiciones de operaci\u00f3n, obteni\u00e9ndose pastas con un reducido contenido en lignina y hemicelulosas encondiciones de operaci\u00f3n  determinadas.  para el blanqueo de las pastas celul\u00f3sicas producidas a partir de la madera de eucalyptus globulus, mediante los procesos acetosolv y milox, se emplearon secuencias constituidas por etapas de extracci\u00f3n alcalina, preblanqueo con ox\u00edegeno en medio alcalino, preblanqueo con \u00e1cido perf\u00f3rmico en medio \u00e1cido f\u00f3rmico, blanqueo conozono en medio \u00e1cido, blanqueo con per\u00f3xido de hidr\u00f3geno en medio alcalino y tratamiento con una xilanasa comercial, evalu\u00e1ndose el efecto de las condiciones de operaci\u00f3n sobre la calidad de las pastas seg\u00fan par\u00e1metros de calidad establecidos. En determinadas condiciones de operaci\u00f3n y empleando una secuencia eozp, se obtuvieron pastas celu\u00f3sicas con una viscosidad mayor de 600 ml\/g y con una blancura superior al 90% iso, que cumplen los requisitos para su utilizaci\u00f3<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio del fraccionamiento qu\u00edmico de la madera en medio \u00e1cido org\u00e1nicos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio del fraccionamiento qu\u00edmico de la madera en medio \u00e1cido org\u00e1nicos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Severino Abad Peque\u00f1o <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Vigo<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 13\/06\/2000<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Juan  Carlos Paraj\u00f3 Li\u00f1ares<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: gonzalo V\u00e1zquez u\u00f1a <\/li>\n<li>Luis Jimenez alcaide (vocal)<\/li>\n<li>esteban Chornet gene (vocal)<\/li>\n<li>gervasio Antorrena \u00e1lvarez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Severino Abad Peque\u00f1o Se aborda el estudio de la obtenci\u00f3n de pastas celul\u00f3sicas de elevada pureza a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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