# Polysaccharide and lignin modification using reactive extrusion (REX)

Romain Milotskyi, Christophe C. Bliard

► To cite this version:

Romain Milotskyi, Christophe C. Bliard. Polysaccharide and lignin modification using reactive extrusion (REX). 14ème Journée scientifique du GFP Section Grand-Est, Jun 2016, Nancy, France., 2016. [hal-02297394](https://hal.science/hal-02297394)

HAL Id: hal-02297394

https://hal.science/hal-02297394

Submitted on 2 Oct 2019

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# Polysaccharide and lignin modification using reactive extrusion (REX)

## Roman Milotskyi, Christophe Bliard

ICMR CNRS UMR 7312 University of Reims Champagne Ardenne
BP 1039 F- 51687 Reims

Natural polymers possess physicochemical properties in their native state, which limit their use in many industrial sectors. Even limited chemical modifications radically change the properties of these macromolecular entities. Chemical modifications commonly performed at industrial-level production in solution or in batches [1] are often laborious and difficult to monitor. In addition, these processes suffer from energy cost and environmental issues caused by unreacted components and co-products. Reactive extrusion offers a simple process, using no solvents, shorter reaction time and improved efficacy [2-4].

In the present work we describe a method of chemical modification using reactive extrusion process (REX). In this project three families of biopolymers: starch, cellulose and lignin are studied. In the following example carboxymethyl starches (CMS) with various degrees of substitution (DS) were synthesized in one step and with high levels of reaction efficiency (RE). The results on the distribution of the carboxymethyl functions on the three different positions of the glucose monomer as well as the kinetics of the reaction are analyzed and discussed.

<figure><img src="image_2.png" /></figure>

<footnote n="1">¹ Xiao, B. ; Sun, X.F. ; Sun, RunCang *The chemical modification of lignins with succinic anhydride in aqueous systems*, Polymer degradation and stability / v.71 no.2, pp.223-231 (2001)

² A. Ayoub, C. Bliard et al *Study of the Thermoplastic Wheat Starch Cationisation Reaction under Molten Condition*, Starch/Stärke, 56, 513-519 (2004)

³ S. Senturk-Ozer et al. *Biomass pretreatment strategies via control of rheological behavior of biomass suspensions and reactive twin screw extrusion processing*, Bioresource Technology 102 9068-9075 (2011)

⁴ Bhandari P.N., Jones D.D. and Hanna M.A. *Carboxymethylation of cellulose using reactive extrusion*, Carbohydrate Polymer 87, 2246-2254 (2012)</footnote>