Integrated conversion of 1-butanol to 1,3-butadiene

Area of Science:

• Chemical Engineering
• Catalysis
• Sustainable Chemistry

Background:

• Growing demand for 1,3-butadiene from renewable resources.
• Need for efficient, non-petroleum-based production routes.
• Exploration of catalytic processes for C4 chemical synthesis.

Purpose of the Study:

• To investigate an integrated process for 1,3-butadiene production from 1-butanol.
• To evaluate catalyst performance in dehydration and dehydrogenation steps.
• To assess the impact of different doping agents and atmospheres on yield and selectivity.

Main Methods:

• Two-step catalytic process: 1-butanol dehydration over γ-Al2O3 to linear butenes, followed by dehydrogenation of butenes to 1,3-butadiene over K-doped Cr2O3/Al2O3.
• Varied reaction conditions, including temperature, catalyst doping (K, Ni, Ca), and atmosphere (N2, CO2).
• Analysis of linear butene and 1,3-butadiene yields and C4 selectivity.

Main Results:

• Achieved >90% linear butene yield at 360 °C in the dehydration step.
• Obtained >40% single-pass 1,3-butadiene yield from 1-butene in N2.
• Integrated process yielded 10-15% 1,3-butadiene with >90% linear C4 selectivity.
• Catalyst doping and CO2 atmosphere generally showed limited improvement over N2.

Conclusions:

• The integrated dehydration/dehydrogenation process is a feasible route for 1,3-butadiene production from 1-butanol.
• Further catalyst and process optimization, particularly with reactor recycling, could significantly enhance 1,3-butadiene yields.
• Current findings provide a foundation for developing sustainable butadiene production methods.