Integrated Steam Supply for Ethanol Dehydration Energy Balance
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Solution Overview
Problem
The ethanol dehydration process in the ethanol to jet fuel conversion requires an optimal steam-to-ethanol ratio for catalyst stability and endothermicity management, while existing methods face energy-intensive steam generation challenges.
Innovation Solution
Integrate steam generation from exothermic oligomerization and hydrogenation reactions to supply steam for ethanol dehydration, maintaining a steam-to-ethanol ratio of 1.0 to 2.0 wt/wt, utilizing reactors and fractionation units for efficient steam production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If steam is generated externally for ethanol dehydration, then steam supply is ensured, but energy consumption increases significantly
Solution Approach 1:
The patent combines the steam generation function with the existing oligomerization and hydrogenation reactors by integrating steam drums and heat exchange systems. The exothermic reactions in these units generate steam in-situ, merging multiple functions (chemical conversion and steam generation) into a single integrated system, thereby reducing external energy requirements while ensuring adequate steam supply for dehydration.
Solution Approach 2:
The system uses the exothermic heat from oligomerization and hydrogenation reactions to generate its own steam requirement. The steam drums capture and utilize the heat naturally produced during these reactions, making the process self-sufficient for steam generation and eliminating the need for separate external steam generation equipment.
2Reliability
If steam to ethanol ratio is increased for better catalyst stability, then catalyst life improves, but energy intensity increases
Solution Approach 1:
The patent implements a feedback mechanism where steam is generated and supplied based on the actual heat output from the oligomerization and hydrogenation reactions. The steam drums and heat exchange systems continuously monitor and adjust steam generation to match process requirements, ensuring optimal steam-to-ethanol ratio for catalyst stability without excessive energy input.
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
Achieves efficient steam supply for catalyst stability and reactor endothermicity control, reducing energy intensity and optimizing the ethanol dehydration process.
Implementation Method 1
reacting said ethanol feed stream at reaction conditions in the presence of a catalyst to produce an ethylene effluent stream
Implementation Method 2
Integrate steam generation from exothermic oligomerization and hydrogenation reactions to supply steam for ethanol dehydration
Data Source
AI summary
An ethanol dehydration process is provided in which the steam to ethanol ratio is between about 1.0 to 2.0 wt/wt and preferably about 1.5 wt/wt. Steam can be imported from outside the dehydration process such as from an oligomerization or dimerization reaction.