Valeronitrile hydrolysis in supercritical water

Area of Science:

• Green Chemistry
• Chemical Engineering
• Organic Chemistry

Background:

• Nitriles are key industrial intermediates, with hydrolysis producing valuable amides and acids.
• Conventional nitrile hydrolysis generates significant waste brine due to stoichiometric acid/base use.
• Developing catalytic-free, green alternatives for nitrile hydrolysis is crucial.

Purpose of the Study:

• To investigate the hydrolysis of valeronitrile in pure supercritical water.
• To explore reaction conditions for efficient nitrile conversion and product selectivity without catalysts.
• To assess the viability of supercritical water as a medium for green nitrile hydrolysis.

Main Methods:

• Experiments conducted in a continuous, high-pressure, laboratory-scale apparatus.
• Utilized supercritical water as the sole reaction medium.
• Varied temperatures (400-500°C) and pressure (30 MPa) with residence times up to 100 seconds.

Main Results:

• Achieved over 90% nitrile conversion.
• Demonstrated over 90% selectivity for valeric acid.
• Successfully performed hydrolysis without the need for catalysts or additional reagents.

Conclusions:

• Supercritical water hydrolysis is a highly effective and green method for valeronitrile conversion.
• This process significantly reduces waste brine compared to conventional methods.
• The findings support the industrial application of supercritical water for sustainable nitrile processing.