Search

Your search keyword '"Gimbernat, Alexandra"' showing total 11 results
Start Over Author "Gimbernat, Alexandra" Language english
11 results on '"Gimbernat, Alexandra"'

2. Reactor development for a one‐step hybrid catalytic conversion of D‐glucose to HMF.

Author

Gimbernat, Alexandra, Heuson, Egon, Dumeignil, Franck, Delcroix, Damien, Girardon, Jean‐Sébastien, and Froidevaux, Rénato

Subjects
*FRUCTOSE, *HETEROGENEOUS catalysts, *GLUCOSE, *ISOMERIZATION, *ISOMERASES
Abstract

The design of an "H"‐shaped reactor has been studied to satisfy the possibility of using a triphasic medium to transform d‐glucose into 5‐hydroxymethylfurfural (HMF) by a hybrid catalytic process using an immobilized glucose isomerase, allowing the isomerization of D‐glucose to d‐fructose, and a heterogeneous chemical catalyst to catalyze the dehydration of d‐fructose to HMF. The various parameters influencing the transport of d‐fructose within the reactor were studied, namely the difference in pH between the two aqueous phases, the agitation and the quantity of 3,4‐DCPBA/Aliquat336® used to extract and transport continuously the d‐fructose. The pH discrepancy, which must be between 5.0 and 5.5, turns out to be the real driving force behind the extraction of D‐fructose. The D‐Fru/3,4‐DCPBA molar ratio of 1/0.25 allowed the transport of more than 80 % of the D‐fructose initially present and shows that the same molecule of 3,4‐DCPBA is involved at least twice in the transport of D‐fructose and that the 3,4‐DCPBA/Aliquat336® couple performs a turnover within the organic phase. Finally, a HMF production yield of 30.9 % and an isomerization yield of 79.1 % were obtained, illustrating the shift in the isomerization equilibrium made possible by a D‐fructose extraction yield of 96.8 %. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

3. Cane Juice Softening Through Ion Exchange: Unveiling a Sustainable and Cost-Effective Approach.

Author

Charbonneau, Antoine, Czelusniak, Phelipe, and Gimbernat, Alexandra

Subjects
ION exchange (Chemistry), SUGARCANE, RATE of return, SEWAGE, SUGAR factories, SUGAR industry, CLEANING
Abstract

The Challenge: Scaling in sugar evaporators, a major bottleneck in cane sugar production, is primarily caused by calcium and magnesium hardness naturally present in the extracted juice. Traditionally, chemical softening has been a go-to solution to tackle this kind of challenge, but it suffers from drawbacks like waste generation and pH control challenges. Enters Ion Exchange: Proven successful in the beet industry, ion exchange offers a cleaner and more efficient alternative. However, adapting it to cane's complex juice matrix has been elusive due to organic fouling and higher operating temperatures. The Innovation studied: We present a novel ion exchange technology specifically tailored for cane juice softening. Our poster unveils: • The Scientific Underpinning: Explore the ion exchange principles and their application in cane juice softening, delving into the selection of optimal resins and regeneration strategies. • Experimental Prowess: Witness the details of our pilot-scale trials at operational sugar mills. We'll showcase data on hardness removal efficiency, resin performance, and operational stability. • ROI Revelation: Unmask the financial muscle of this technology. We'll present a comprehensive Return on Investment (ROI) analysis at industrial scale, factoring in capital expenditure, operating costs, and sugar yield improvement. Impactful Outcomes: Beyond environmental benefits like reduced waste and water usage, the innovation promises: Enhanced Evaporator Efficiency: Minimized scaling translates to extended run time and reduced cleaning downtime. • Improved Sugar Quality: Consistent juice quality leads to superior sugar crystal formation and purity. • Boosted Profitability: The compelling ROI makes this technology a lucrative proposition for any cane sugar mill. This poster unveils a game-changer for the cane industry. demystifying the science, showcasing successful trials, and quantifying the economic benefits, this demonstration could pave the way widespread adoption of this sustainable and cost-effective solution. In conclusion the poster shows how Ion exchange can revolutionize cane juice softening and usher new era of efficiency and profitability for the industry. [ABSTRACT FROM AUTHOR]

Published
2024

4. Hybrid Catalysis: Combining Bio- and Chemo-Catalysis for Biosourced Substrates Upgrading

Author

Dumeignil, Franck, Gimbernat, Alexandra, Guehl, Marie, Capron, Mickael, Lopes Ferreira, Nicolas, Froidevaux, Rénato, Girardon, Jean-Sébastien, Dhulster, Pascal, Delcroix, Damien, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut Charles Viollette (ICV) - EA 7394 (ICV), Université d'Artois (UA)-Institut National de la Recherche Agronomique (INRA)-Université du Littoral Côte d'Opale (ULCO)-Institut Supérieur d'Agriculture-Université de Lille, and IFP Energies nouvelles (IFPEN)

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2019

5. Hybrid Catalysis: Novel Concept for Upgrading Biosourced Substrates

Author

Dumeignil, Franck, Gimbernat, Alexandra, Guehl, Marie, Capron, Mickael, Lopes Ferreira, Nicolas, Froidevaux, Rénato, Girardon, Jean-Sébastien, Dhulster, Pascal, Delcroix, Damien, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut Charles Viollette (ICV) - EA 7394 (ICV), Université d'Artois (UA)-Institut National de la Recherche Agronomique (INRA)-Université du Littoral Côte d'Opale (ULCO)-Institut Supérieur d'Agriculture-Université de Lille, IFP Energies nouvelles (IFPEN), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

6. Hybrid Catalysis as an Innovative Way for Upgrading Biosourced Substrates

Author

Dumeignil, Franck, Gimbernat, Alexandra, Guehl, Marie, Capron, Mickael, Lopes Ferreira, Nicolas, Froidevaux, Rénato, Girardon, Jean-Sébastien, Dhulster, Pascal, Delcroix, Damien, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut Charles Viollette (ICV) - EA 7394 (ICV), Université d'Artois (UA)-Institut National de la Recherche Agronomique (INRA)-Université du Littoral Côte d'Opale (ULCO)-Institut Supérieur d'Agriculture-Université de Lille, and IFP Energies nouvelles (IFPEN)

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

7. Hybrid catalysis as the next challenge in biorefineries: concept and examples

Author

Dumeignil, Franck, Gimbernat, Alexandra, Guehl, Marie, Capron, Mickael, Lopes Ferreira, Nicolas, Froidevaux, Rénato, Girardon, Jean-Sébastien, Dhulster, Pascal, Delcroix, Damien, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut Charles Viollette (ICV) - EA 7394 (ICV), Université d'Artois (UA)-Institut National de la Recherche Agronomique (INRA)-Université du Littoral Côte d'Opale (ULCO)-Institut Supérieur d'Agriculture-Université de Lille, and IFP Energies nouvelles (IFPEN)

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

8. From a Sequential Chemo-Enzymatic Approach to a Continuous Process for HMF Production from Glucose

Author

Gimbernat, Alexandra, Guehl, Marie, Ferreira, Nicolas Lopes, Heuson, Egon, Dhulster, Pascal, Capron, Mickael, Dumeignil, Franck, Delcroix, Damien, Girardon, Jean Sébastien, Froidevaux, Rénato, Institut Charles Viollette (ICV) - EA 7394 (ICV), Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut National de la Recherche Agronomique (INRA)-Université d'Artois (UA)-Institut Supérieur d'Agriculture, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, IFP Energies nouvelles (IFPEN), This research was funded by IFP Energies nouvelles for funding these studies. Chevreul Institute (FR 2638), Ministère de l’Enseignement Supérieur et de la Recherche, Région Hauts-de-France (CPER ALIBIOTECH), REALCAT platform (‘Future Investments’ program (PIA), with the contractual reference ‘ANR-11-EQPX-0037′) and FEDER are acknowledged for supporting and funding partially this work., ANR-11-EQPX-0037,REALCAT,Plateforme intégREe AppLiquée au criblage haut débit de CATalyseurs pour les bioraffineries(2011), Université d'Artois (UA)-Institut National de la Recherche Agronomique (INRA)-Université du Littoral Côte d'Opale (ULCO)-Institut Supérieur d'Agriculture-Université de Lille, Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), ENSCL, Université de Lille, CNRS, INRA, ISA, Centrale Lille, Univ. Artois, Univ. Littoral Côte d’Opale, Institut Charles Viollette (ICV) - EA 7394 [ICV], Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS], IFP Energies nouvelles [IFPEN], Unité de Catalyse et de Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Ecole Centrale de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and ANR-11-EQPX-0037/11-EQPX-0037,REALCAT,Plateforme intégREe AppLiquée au criblage haut débit de CATalyseurs pour les bioraffineries(2011)

Subjects
chemo-enzymatic catalysis, biomass, 5-hydroxymethylfurfural (HMF), lcsh:Chemical technology, lcsh:Chemistry, lcsh:QD1-999, [CHIM]Chemical Sciences, lcsh:TP1-1185, (bio) catalysis, glucose, chemo‐enzymatic catalysis, HMF, (bio)catalysis
Abstract

International audience; Notably available from the cellulose contained in lignocellulosic biomass, glucose is a highly attractive substrate for eco-efficient processes towards high-value chemicals. A recent strategy for biomass valorization consists on combining biocatalysis and chemocatalysis to realise the so-called chemo-enzymatic or hybrid catalysis. Optimisation of the glucose conversion to 5-hydroxymethylfurfural (HMF) is the object of many research efforts. HMF can be produced by chemo-catalyzed fructose dehydration, while fructose can be selectively obtained from enzymatic glucose isomerization. Despite recent advances in HMF production, a fully integrated efficient process remains to be demonstrated. Our innovative approach consists on a continuous process involving enzymatic glucose isomerization, selective arylboronic-acid mediated fructose complexation/transportation, and chemical fructose dehydration to HMF. We designed a novel reactor based on two aqueous phases dynamically connected via an organic liquid membrane, which enabled substantial enhancement of glucose conversion (70%) while avoiding intermediate separation steps. Furthermore, in the as-combined steps, the use of an immobilized glucose isomerase and an acidic resin facilitates catalyst recycling

Published
2018

9. From a sequential chemo-enzymatic approach to a vontinuous process for HMF production from glucose

Author

Gimbernat, Alexandra, Guehl, Marie, Lopes Ferreira, Nicolas, Heuson, Egon, Dhulster, Pascal, Capron, Mickael, Dumeignil, Franck, Delcroix, Damien, Girardon, Jean Sebastien, and Froidevaux, Renato

Subjects
(bio) catalysis, biomass, glucose, chemo-enzymatic catalysis
Abstract

Notably available from the cellulose contained in lignocellulosic biomass, glucose is a highly attractive substrate for eco-efficient processes towards high-value chemicals. A recent strategy for biomass valorization consists on combining biocatalysis and chemocatalysis to realise the so-called chemo-enzymatic or hybrid catalysis. Optimisation of the glucose conversion to 5-hydroxymethylfurfural (HMF) is the object of many research efforts. HMF can be produced by chemo-catalyzed fructose dehydration, while fructose can be selectively obtained from enzymatic glucose isomerization. Despite recent advances in HMF production, a fully integrated efficient process remains to be demonstrated. Our innovative approach consists on a continuous process involving enzymatic glucose isomerization, selective arylboronic-acid mediated fructose complexation/transportation, and chemical fructose dehydration to HMF. We designed a novel reactor based on two aqueous phases dynamically connected via an organic liquid membrane, which enabled substantial enhancement of glucose conversion (70%) while avoiding intermediate separation steps. Furthermore, in the as-combined steps, the use of an immobilized glucose isomerase and an acidic resin facilitates catalyst recycling.

Published
2018

11. Hybrid Catalysis: A Suitable Concept for the Valorization of Biosourced Saccharides to Value-Added Chemicals.

Author

Gimbernat, Alexandra, Guehl, Marie, Capron, Mickaël, Lopes Ferreira, Nicolas, Froidevaux, Renato, Girardon, Jean‐Sébastien, Dhulster, Pascal, Delcroix, Damien, and Dumeignil, Franck

Subjects
*CATALYSIS, *BIOCATALYSIS, *FUEL, *BIOMASS, *GLUCOSE isomerase, *CHARTS, diagrams, etc.
Abstract

Through biomass valorization, sugars can become a major carbon resource for the production of fuels and chemicals by using catalysis. Hybrid catalysis, a direct combination of biocatalysis and chemocatalysis, may yield innovative solutions. 5-Hydroxymethylfurfural (5-HMF) is a platform molecule derived from glucose, for which fructose is a key intermediate. To overcome the thermodynamic enzymatic equilibrium between glucose and fructose, two methodologies based on hybrid catalysis are described herein. In the first method, the glucose isomerase and fructose-to-5-HMF dehydration chemocatalysts are simultaneously implemented in a multiphasic way to imply the complexation and transport of fructose. The second method proposes a route through sorbitol, obtained by the hydrogenation of glucose. Sorbitol is then enzymatically converted into fructose, whereas regeneration of the cofactor is performed in situ with an organometallic complex as a chemocatalyst. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results