Published May 19, 2021 | Version v1
Journal article Open

Sulfuric Acid-Catalyzed Dehydration of Carbohydrates for the Production of Adhesive Precursors

  • 1. Wood K plusCompetence Center of Wood Composites and Wood Chemistry, Kompetenzzentrum Holz GmbH, A-4040 Linz, Austria; Institute of Wood Technology and Renewable Materials, Department of Material Science and Process Engineering University of Natural Resources and Life Sciences, Vienna (BOKU), A-3430 Tulln, Austria
  • 2. Institute of Chemistry of Renewable Resources, Department of Chemistry, University of Natural Resources and Life Sciences, Vienna (BOKU), A-3430 Tulln, Austria
  • 3. Institute of Wood Technology and Renewable Materials, Department of Material Science and Process Engineering University of Natural Resources and Life Sciences, Vienna (BOKU), A-3430 Tulln, Austria
  • 4. Wood K plusCompetence Center of Wood Composites and Wood Chemistry, Kompetenzzentrum Holz GmbH, A-4040 Linz, Austria; Institute of Wood Technology and Renewable Materials, Department of Material Science and Process Engineering University of Natural Resources and Life Sciences, Vienna (BOKU), A- 3430 Tulln, Austria

Description

Carbohydrates and hexose-derived 5-hydroxymethylfurfural (5-HMF) are platform chemicals for the synthesis of sustainable binders. New, greener approaches aim at the development of production systems, which minimize process steps and avoid organic solvents or other auxiliaries that could interfere with subsequent resin synthesis. In our work, carbohydrate solutions rich in 5-hydroxymethylfurfural (5-HMF) were produced using a continuous-flow microreactor and diluted H2SO4 as the catalyst. After optimization of the process conditions (temperature, reaction time, catalyst content), a 5-HMF yield of 49% was obtained at a low reaction time of 0.6 min and a catalyst concentration of 1% at 175 °C and 17 bar pressure. Extensive rehydration of the product was avoided by efficient immediate cooling of the reaction solution. The stability of the reaction system was improved by increasing the inner diameter of the capillary in the flow reactor to 2 mm. Advantageously, the obtained reaction mixtures are used directly as precursors in the development of sustainable binder systems, without the need for additional purification, filtration, or extraction steps.

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Sulfuric Acid-Catalyzed Dehydratization of Carbohydrates for the Production of Adhesive Precursors.pdf

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Related works

Is supplemented by
10.1021/acsomega.1c02075. (DOI)

Funding

SusBind – Development and pilot production of SUStainable bio BINDer systems for wood based panels 792063
European Commission