Zinc-Ferrite Catalyst Oxidative Dehydrogenation Butene Selectivity
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Solution Overview
Problem
Current methods for the oxidative dehydrogenation of butene to produce butadiene are in need of improvement for enhanced selectivity and yield.
Innovation Solution
A method involving a zinc-ferrite catalyst with specific precursor ratios and the inclusion of steam in the feed stream, which also contains a diluent like methane, to optimize the oxidative dehydrogenation reaction conditions, including a molar ratio of oxygen to butene and steam to butene, is employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional oxidative dehydrogenation methods are used, then butadiene can be produced, but butadiene selectivity is insufficient
Solution Approach 1:
The patent optimizes specific parameters including the molar ratio of oxygen to butene (0.5-1.5), steam to butene ratio (5-20), and reaction temperature (330-370°C) to achieve butadiene selectivity greater than 92%. These parameter changes resolve the contradiction by finding optimal operating conditions that maximize selectivity without requiring overly complex process modifications
Solution Approach 2:
The patent employs a composite zinc-ferrite catalyst with specific composition (FeZn_aCo_bMg_cCa_dCl eMfO_x where a=0.07-0.7, b=0.01-0.20, c≤0.40, d≤0.40, e≤0.10, f≤0.20) that combines multiple metal oxides to achieve high butadiene selectivity. This composite catalyst material resolves the selectivity issue without requiring complex multi-step catalytic systems
2Productivity
If oxidative dehydrogenation is performed, then butadiene yield can be increased, but oxygen conversion efficiency is insufficient
Solution Approach 1:
The patent optimizes the oxygen to butene molar ratio (0.5-1.5) and oxygen conversion (90-99%) to simultaneously achieve high butadiene yield and efficient oxygen utilization. This parameter optimization resolves the contradiction by preventing both incomplete oxygen conversion and excessive oxygen consumption that would reduce efficiency
Solution Approach 2:
The patent implements process control that monitors oxygen conversion and butadiene yield to maintain optimal operating conditions. This feedback mechanism ensures that oxygen is efficiently converted while maximizing butadiene production, resolving the contradiction between productivity and energy efficiency
3Manufacturing precision
If steam is added to the feed stream, then butadiene selectivity is improved, but reactor operation complexity increases
Solution Approach 1:
The patent specifies an optimized steam to butene molar ratio range of 5-20, with preferred ranges of 10-15, to achieve high butadiene selectivity while maintaining manageable reactor operation. This parameter specification resolves the contradiction by providing clear operational guidelines that improve selectivity without requiring complex steam injection systems or control mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves butadiene selectivity greater than 92% and oxygen conversion of 90% to 99%, with increased yield and efficient reactor operation.
Implementation Method 1
A method involving a zinc-ferrite catalyst with specific precursor ratios and the inclusion of steam in the feed stream, which also contains a diluent like methane, to optimize the oxidative dehydrogenation reaction conditions
Implementation Method 2
the oxidative dehydrogenation of butene to produce butadiene. Chinese Patent Publication No. discloses a process for the oxidative dehydrogenation of butene to butadiene using a ferrite catalyst
Data Source
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AI summary
Methods for producing butadiene by the oxidative dehydrogenation of butene are provided. Methods for producing butadiene from a feed stream including oxygen and butene in a molar ratio of oxygen to butene (O2/C4H8) from about 0.9 to about 1.5 can include introducing the feed stream to a catalyst in the presence of steam. The molar ratio of steam to butene (H2O/C4H8) can be from about 10 to about 20. Methods can further include reacting the butene to generate a product stream therefrom comprising butadiene and water. Methods can further include separating water from the product stream to generate a butadiene stream including greater than about 85 wt-% butadiene.