Palestra "Inherent Biomass Properties and Chemical Characteristics of Ionic Liquids on Biomass Valorization – Pre-treatment and Enzymatic Hydrolysis"

A Palestra realiza-se no dia 23 de maio de 2018 no Auditório Solar XXI, LNEG - Polo do Lumiar

Oradora: Joana Bernardo

Resumo:

Ionic Liquid (IL) technology is one of the biomass processing technology gaining considerable interests due to the potential to remove the native recalcitrance of lignocellulosic feedstock. Two different approaches, according to the chemical character of examined ILs, i.e. hydrogen-bond acidity and basicity, paved the way of a fractionation of wheat straw and eucalyptus. A first strategy relies on a three-step fractionation process using alkaline 1-ethyl-3-methyimidazolim acetate ([emim][OAc]) allowing selective separation of cellulose, hemicellulose and lignin each characterised by high purity. The second strategy integrated a pre-treatment, hydrolysis and conversion of biomass in a “one-pot” approach by the employment of imidazolium-based IL containing HSO4 anion. This IL revealed the ability to selectively hydrolyse and convert the hemicellulosic fraction of wheat straw and eucalyptus into pentoses and/or furfural, in which the formation of pentoses are more favourable in presence of water. Both types of ILs were recovered and reused without losing their performance in biomass valorisation, showcasing efficient and sustainable processes for implementation. The produced cellulose-rich fractions were subject to enzymatic hydrolysis under industrially relevant conditions. The chemical effect of IL employed was observed in this step as its determined the efficiency of enzymatic hydrolysis. To understand the behaviour behind this effect, the biomass crystallinity was elucidated too. Therefore, the relation between biomass pre-treatment, morphological changes in leftover as well as enzymatic hydrolysis yield was established in this work.

This work performed in the frame of H2020 project “AMBITION - Advanced biofuel production with energy system integration" (Grant Agreement number: 731263 – H2020-LCE-2016-2017/H2020-LCE-2016-ERA).

Nota biográfica:

Joana Bernardo é Mestre em Engenharia Química (Instituto Superior de Engenharia de Lisboa, 2010) e Doutorada em Química (Instituto Superior Técnico, 2017). O seu trabalho de doutoramento focou-se no desenvolvimento de novas metodologias para a redução de compostos orgânicos e a valorização da biomassa utilizando oxo-complexos rénio como catalisadores. Atualmente é Bolseira de Investigação na Unidade de Bioenergia do LNEG no âmbito do projeto “AMBITION - Advanced biofuel production with energy system integration”, onde tem explorado diferentes métodos de pré-tratamento da biomassa lenhocelulósica, principalmente o fraccionamento e valorização da biomassa com recurso a líquidos iónicos.

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Destinatários:

Investigadores, Técnicos, Bolseiros, Estagiários e público em geral.

Data e hora:

23 de maio de 2018, das 11:00h às 12:00h.

Localização

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