Bifunctional Alumina Catalyst for Ethanol and n-Propanol Dehydration
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Solution Overview
Problem
Current methods for producing ethylene and propylene from renewable sources, such as biomass, require separate dehydration stages for ethanol and n-propanol, which are costly and energy-intensive due to the need for prior separation of these alcohols, and do not efficiently utilize the water content in the mixture.
Innovation Solution
A process involving a dehydration unit with specific alumina catalysts (A and B) that dehydrate a mixture of ethanol and n-propanol with a water content between 30-75% by weight, allowing simultaneous conversion to ethylene and propylene without prior separation, utilizing water as a thermal fluid to reduce reaction endothermicity and recover condensation energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate dehydration stages are used for ethanol and n-propanol, then dehydration activity and selectivity are improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent combines the dehydration of ethanol and n-propanol into a single catalytic stage using a bifunctional catalyst that simultaneously dehydrates both alcohols to ethylene and propylene, eliminating the need for separate dehydration units and the complex separation infrastructure required by conventional methods
Solution Approach 2:
The bifunctional catalyst performs multiple functions: it catalyzes the dehydration of both ethanol and n-propanol, manages water tolerance up to 75 wt%, and enables direct conversion from the aqueous fermentation mixture without requiring prior alcohol separation
2Productivity
If prior separation of ethanol and n-propanol is performed, then dehydration efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent converts the harmful effect of water (which typically poisons catalysts and reduces efficiency) into a benefit by designing a water-tolerant bifunctional catalyst that can process the aqueous fermentation mixture directly, utilizing up to 75 wt% water content without requiring energy-intensive dehydration or separation steps
Solution Approach 2:
The invention performs preliminary action by directly converting the aqueous fermentation mixture containing both alcohols in a single catalytic step, eliminating the need for preliminary separation operations and reducing overall process energy requirements
3Adaptability or versatility
If water content in the mixture is high, then renewable resource utilization is improved, but reaction endothermicity increases
Solution Approach 1:
The patent changes the parameter of water content tolerance from a limiting factor to an accepted condition by designing a bifunctional catalyst that maintains high activity and selectivity with water content up to 75 wt%, fundamentally altering the process conditions to accommodate high-water fermentation streams
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 process achieves high dehydration activity and selectivity for ethylene and propylene, reducing the number of unit operations and energy consumption, making it economically advantageous by eliminating the need for costly alcohol separation and utilizing water to optimize reaction conditions.
Implementation Method 1
the mixture is brought into contact, in a dehydration unit, with a dehydration catalyst chosen from: an alumina (A) having a BET specific surface area measured according to the standard ASTM D 3663-03 comprised between 200 and 350 m2/g, a mean mesopore diameter comprised between 5 and 15 nm
Implementation Method 2
process for the production of a mixture of ethylene and propylene from an aqueous mixture containing ethanol and n-propanol
Implementation Method 3
utilizing water as a thermal fluid to reduce reaction endothermicity and recover condensation energy
Implementation Method 4
recover condensation energy
Data Source
AI summary
The present invention relates to a process for the production of a mixture of ethylene and propylene from a mixture containing ethanol and n-propanol and having a water content comprised between 30 and 75% by weight with respect to the total weight of the mixture.