1 / 6

NIR spectroscopy and chemometrics for ionic liquids : lignocellulosic biomass dissolution

NIR spectroscopy and chemometrics for ionic liquids : lignocellulosic biomass dissolution. Bettina Liebmann, Joana Rodrigues, Anton Friedl, Kurt Varmuza bettina.liebmann@tuwien.ac.at. Introduction.

ron
Télécharger la présentation

NIR spectroscopy and chemometrics for ionic liquids : lignocellulosic biomass dissolution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NIR spectroscopyandchemometricsforionicliquids: lignocellulosicbiomassdissolution Bettina Liebmann, Joana Rodrigues, Anton Friedl, Kurt Varmuza bettina.liebmann@tuwien.ac.at

  2. Introduction • The dissolution in ionic liquids (IL) is a new, alternative technology to disrupt the complex fibre network of lignocellulosic biomass at comparatively mild conditions. • Its three main compounds – cellulose, hemicelluloses, and lignin – are interesting renewable sources for biofuels, chemicals, and biomaterials. • Once dissolved in the IL, they can be separated by simple addition of an anti-solvent; e.g., the addition of water immediately precipitates amorphous cellulose from the IL. • In this preliminary study we investigate the applicability of NIR spectroscopy and chemometrics for quantifying the three main compounds of lignocelluloses in IL. Strawcomposition, schematically

  3. IonicLiquids • consist entirely of ions (salts) • melting point < 100°C (liquid at room T!) • negligible vapour pressure • excellent thermal stability up to 400°C • non flammable • electrically conducting, magnetic • many interesting applications! • “design” properties by ion combination Molecularstructureoftheionic liquid EMIM-Oac (1-ethyl-methyl-imidazolium acetate) After mixing the pure cellulose with EMIM-Oac, particles and agglomerations are dissolved by ultrasound and temperatures 40-60 °C for 7-24 hours to obtain clear solutions.

  4. Near-infraredspectroscopy (NIR) NIR spectrometer (BrimroseLuminar 5030, AOTF) NIR transflectance probe with variable pathlength for liquid samples (left); NIR diffuse reflectance probe for solid samples (right). NIR spectrum of the used IL; NIR spectra of pure solid cellulose, lignin, and xylan.

  5. NIR spectra and predicted concentration by PLS regression model SEPCV, standard error of prediction from leave-one-out cross validation; aCV, number of PLS componentsPLS-models with leave-one-out CV in software Unscrambler.

  6. Summaryand Outlook • Empirical models for the concentration of cellulose, lignin, and xylan in ionic liquid EMIM-OAc result in good prediction performance. • In the next step, experiments will focus on multi-component mixtures of cellulose, lignin, and xylan in the ionic liquid. • Good reference values for actually dissolved straw components in the IL is a limiting factor in PLS model building for industrial application.

More Related