Abstract
Acrylonitrile is currently made from fossil resources. We investigated the synthesis of acrylonitrile from propionic acid in only two steps, which opens up a new route to acrylonitrile based on propionic acid obtained by fermentation. Propionic acid was initially converted to propionitrile with NH3 at 400 °C. Zeolite H-Y allows for >99% selectivity at 98% conversion. However, coking led to deactivation after 180 min on stream. The dehydrogenation of propionitrile to acrylonitrile was catalyzed by SnO/SiO2. The selectivity was 71% at 22% conversion, which gives already after first experiments an overall selectivity for acrylonitrile production from propionic acid of 71%.
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