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      EFECTO DEL CARBONATO DE POTASIO EN LA EVOLUCIÓN DE LOS GRUPOS FUNCIONALES DE LOS BIOCRUDOS DE CONVERSIÓN HIDROTÉRMICA DE BIOMASA LIGNOCELULÓSICA ALREDEDOR DEL PUNTO CRÍTICO DEL AGUA Translated title: POTASSIUM CARBONATE EFFECT ON BIOCRUDE FUNCTIONAL GROUPS EVOLVING FROM LIGNOCELLULOSIC BIOMASS UNDERGOING HYDROTHERMAL CONVERSION CLOSE TO THE CRITICAL POINT OF WATER Translated title: EFEITO DO CARBONATO DE POTÁSSIO NA FORMAÇÃO DOS GRUPOS FUNCIONAIS DOS BIOPETRÓLEOS OBTIDOS POR CONVERSÃO HIDROTÉRMICA DE BIOMASSA LENHOCELULÓSICA PRÓXIMO DO PONTO CRÍTICO DA ÁGUA

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          Abstract

          Un tipo de biomasa pobre en lignina, del género Pennisetum, fue sometida al proceso de conversión hidrotérmica en presencia de carbonato de potasio como catalizador. Las reacciones se llevaron a cabo en ambientes cercanos al punto crítico del agua. Los productos de reacción no acuosos (biocrudo) se separaron por decantación y se analizaron por espectrometría infrarroja. Los biocrudos obtenidos contienen compuestos con funcionalidades aromáticas, olefínicas, hidroxiladas, éteres, y para el caso del biocrudo obtenido bajo la condición subcrítica funciones carbonilo. La fracción gaseosa y el biocrudo aumentan en presencia del carbonato de potasio.

          Translated abstract

          A type of poor-lignin biomass (Pennisetum sp.) was hydrothermally converted in the presence of potassium carbonate as catalyst. The reactions were carried out close to the critical point of the water. The non-aqueous (biocrude) reaction products were separated by decantation and were analyzed by infrared spectrometry. The biocrude products so obtained contained compounds having aromatic, olephinic, hydroxylated and ether functionalities; sub-critical biocrude had carbonyl functions. The gaseous and biocrude fractions increased in the presence of potassium carbonate.

          Translated abstract

          Um tipo de biomassa pobre em lenhina, do género Pennisetum, foi submetido ao processo de conversão hidrotérmica na presença de carbonato de potássio como catalisador. As reacções foram conduzidas em condições próximas do ponto crítico da água. Os produtos de reacção não aquosos (biopetróleo) foram separados por decantação e analisados por espectroscopia de infravermelho. Os biopetróleos obtidos contêm compostos com funcionalidades aromáticas, olefínicas, hidroxiladas, éteres e, no caso do biopetróleo obtido sob condição subcrítica, funções carbonilo. A fracção gasosa e a quantidade de biopetróleo aumentam na presença de carbonato de potássio.

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          Most cited references20

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          Dissolution and Hydrolysis of Cellulose in Subcritical and Supercritical Water

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            Hydrothermal upgrading of biomass to biofuel; studies on some monosaccharide model compounds.

            During the hydrothermal upgrading of biomass, hydrolysis to glucose is an important step. To elucidate some of the reaction pathways that follow this initial hydrolysis, the hydrothermal treatment (340 degrees C, 27.5 MPa, 25-204 s) of dilute (50 mM) solutions of D-glucose and some other monosaccharides were studied. As a result of the increase of Kw under subcritical conditions, both acid and base catalysed reactions occur. The acid catalysed reactions are mainly dehydrations leading initially to 5-hydroxymethylfurfural. Important base catalysed reactions result in glycolaldehyde and glyceraldehyde. Further fragmentations and dehydrations lead to a variety of low molecular weight compounds such as formic acid, acetic acid, lactic acid, acrylic acid, 2-furaldehyde and 1,2,4-benzenetriol. Important pathways leading to a decrease of the O-content of the liquid reaction products start from the intermediate glyceraldehyde, which forms pyruvaldehyde, which in its turn is converted into formic acid and acetaldehyde. The latter compound can also be formed via isomerisation of glyceraldehyde into lactic acid followed by decarbonylation.
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              XPS and15N NMR Study of Nitrogen Forms in Carbonaceous Solids

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rcq
                Revista Colombiana de Química
                Rev.Colomb.Quim.
                Departamento de Química, Universidad Nacional de Colombia. (Bogotá )
                0120-2804
                August 2008
                : 37
                : 2
                : 243-251
                Affiliations
                [1 ] Universidad Nacional de Colombia Colombia
                [2 ] Universidad Nacional de Colombia Colombia
                Article
                S0120-28042008000200010
                9ca57aac-fb05-4274-985d-e5167658ec88

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Colombia

                Self URI (journal page): http://www.scielo.org.co/scielo.php?script=sci_serial&pid=0120-2804&lng=en
                Categories
                CHEMISTRY, MULTIDISCIPLINARY

                General chemistry
                biomass,bio-oil,potassium carbonate,subcritical water,fuels,biomassas,biopetróleo,carbonato de potássio,água subcrítica,combustíveis,biomasa,biocrudo,carbonato de potasio,agua subcrítica,combustibles

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