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Synthesis of Acrylonitrile from Renewable Lactic Acid.
Daniel Mack1, Sabrina Schätzle1, Yvonne Traa1
1Institute of Chemical Technology, University of Stuttgart, 70550, Stuttgart, Germany.
Chemsuschem
|February 16, 2019
Summary
This study presents a novel two-step method to produce acrylonitrile (ACN) from renewable lactic acid (LA). This sustainable process offers an alternative to fossil fuel-based ACN production, yielding 57% overall selectivity.
Area of Science:
- Chemical Engineering
- Green Chemistry
- Biomass Conversion
Background:
- Acrylonitrile (ACN) is a key monomer for polymers and carbon fibers, traditionally derived from fossil resources.
- There is a growing need for sustainable alternatives to petrochemical-based chemical production.
Purpose of the Study:
- To develop and evaluate a two-step process for converting renewable lactic acid (LA) into acrylonitrile (ACN).
- To optimize reaction conditions for high selectivity and yield in ACN synthesis from biomass-derived LA.
Main Methods:
- Direct amidation of lactic acid (LA) with ammonia over NH4-ZSM-5 catalyst at 230°C.
- Dehydration of the intermediate lactamide to acrylonitrile (ACN) using acetic anhydride.
Main Results:
- The first step, LA amidation, achieved 92% selectivity to lactamide at 33% conversion using NH4-ZSM-5.
- The second step, lactamide dehydration, resulted in 62% ACN selectivity at full conversion.
- An overall selectivity of 57% for ACN production from LA was achieved.
Conclusions:
- A viable two-step pathway for producing acrylonitrile from renewable lactic acid has been demonstrated.
- This research contributes to the development of sustainable chemical manufacturing processes, reducing reliance on fossil fuels.
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