Ethylene Oxide Purification via Single-Column Distillation
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Solution Overview
Problem
Current methods for distilling ethylene oxide from impure feed streams, particularly those containing aldehyde impurities, are inefficient and require multiple distillation apparatuses, leading to higher equipment costs and energy consumption.
Innovation Solution
A process and system that utilize a heat exchanger to heat the feed stream before entering a distillation apparatus without an external reboiler or circulating loop, allowing for the separation of ethylene oxide and aldehyde impurities in a single apparatus, producing an ethylene oxide stream with at least 99.7% purity and an aldehyde-enriched fraction for direct use in a glycol reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple distillation apparatuses are used to separate ethylene oxide from aldehyde impurities, then separation purity is improved, but device complexity and equipment cost increase
Solution Approach 1:
The distillation column is divided into distinct sections: a lower section for aldehyde removal and an upper section for ethylene oxide purification. This internal segmentation allows multiple separation functions to be performed within a single apparatus, achieving high purity ethylene oxide without requiring multiple separate distillation units.
Solution Approach 2:
The single distillation apparatus is designed to perform multiple functions: it simultaneously removes aldehyde impurities from the feed stream and purifies ethylene oxide to the required purity level. This multi-functional design eliminates the need for multiple specialized distillation apparatuses while maintaining separation effectiveness.
2Use of energy by moving object
If external reboiler and circulating loop are used for heating feed stream, then heating efficiency is improved, but energy consumption and equipment complexity increase
Solution Approach 1:
The heating function is merged with the distillation column by incorporating a reboiler section directly within the column structure. This integration eliminates the need for separate external reboilers and circulating loops, reducing equipment complexity while maintaining effective heating for vapor generation.
Solution Approach 2:
The distillation column performs its own heating function through the integrated reboiler section, which generates vapor directly within the column. This self-service approach eliminates the need for external heating systems and circulating loops, reducing both equipment complexity and energy losses associated with external heat transfer systems.
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 reduces equipment costs and energy input by achieving high-purity ethylene oxide production in a single distillation apparatus, while also enabling direct processing of the aldehyde-enriched fraction, thereby improving overall process efficiency and reducing energy consumption.
Implementation Method 1
introducing the feed stream, wherein the aqueous mixture includes ethylene oxide and an amount of aldehyde, into a heat exchanger to heat the feed stream
Implementation Method 2
distilling ethylene oxide from a feed stream containing the alkylene oxide
Data Source
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AI summary
Processes and systems for purifying ethylene oxide, including introducing a feed stream (106) including ethylene oxide to a heat exchanger (102) to heat the feed stream, feeding the heated feed stream to a distillation apparatus (104) base below a first stage, removing from the distillation apparatus an impurity fraction as a top exit stream (116) from the distillation apparatus (104) located at a top take-off on the distillation apparatus (104), removing from the distillation apparatus (104) an ethylene oxide stream (112) of 99.7 weight percent purity, based on the total weight of the ethylene oxide stream, from the distillation apparatus, and removing from the distillation apparatus (104) an aldehyde enriched fraction as a bottom stream (122) from the distillation apparatus (104), where the aldehyde enriched fraction is fed directly to a glycol reactor (123).