Fractionation Zone Alkylation Ketone Separation
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Solution Overview
Problem
In indirect alkylation processes, excessive methyl ethyl ketone in the recycle stream can poison reactor catalysts, leading to the purging of a significant alcohol waste stream, which is difficult to dispose of and requires increased make-up water, posing environmental concerns and inefficiencies.
Innovation Solution
A fractionation zone is introduced to separate methyl ethyl ketone from alcohols and water, allowing the overhead stream to be purged instead of the recycled stream, reducing the volume of waste and minimizing the amount of ketone recycled to the reactor, thereby extending catalyst life and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a portion of the recycle stream is purged to limit methyl ethyl ketone concentration, then catalyst life is extended, but the volume of waste stream increases and disposal becomes difficult
Solution Approach 1:
The patent extracts methyl ethyl ketone from the recycle stream by introducing a side draw stream that selectively removes the ketone component. This allows the majority of the recycle stream to be returned to the reactor while only a small portion containing the ketone is purged, thus extending catalyst life while minimizing waste stream volume.
Solution Approach 2:
The patent segments the recycle stream into multiple components by creating a side draw stream that separates methyl ethyl ketone from alcohols and water. This segmentation allows selective removal of the harmful ketone component while maintaining the beneficial alcohol stream for recycling, resolving the contradiction between catalyst protection and waste minimization.
2Reliability
If a large volume of overhead stream is purged to stay below methyl ethyl ketone threshold, then catalyst poisoning is prevented, but make-up water requirements increase
Solution Approach 1:
The patent extracts methyl ethyl ketone specifically from the recycle stream using a side draw stream, allowing the alcohol and water components to be retained and recycled. This selective extraction prevents catalyst poisoning while minimizing the volume of make-up water needed to replace purged materials.
Solution Approach 2:
The patent changes the composition parameter of the recycle stream by removing methyl ethyl ketone through the side draw stream. This parameter change allows the stream to maintain catalyst-compatible ketone levels while preserving alcohol and water for recycling, thus reducing make-up water requirements.
3Reliability
If methyl ethyl ketone is removed from the recycle stream, then catalyst poisoning is reduced, but separation complexity increases
Solution Approach 1:
The patent introduces a side draw stream that segments the fractionation zone into multiple withdrawal points. This allows selective removal of methyl ethyl ketone at a specific point in the column where its concentration is highest, simplifying the separation process compared to complete distillation while still achieving catalyst protection.
Solution Approach 2:
The side draw stream acts as an intermediary mechanism that facilitates selective ketone removal without requiring complex multi-column separation systems. This intermediary approach provides an efficient compromise between separation effectiveness and system complexity.
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 significantly reduces the volume of the purge stream by about 55% and the make-up water required by about 40%, enhancing the environmental compatibility and operational efficiency of the alkylation process.
Implementation Method 1
The column may provide an overhead stream including the at least one ketone and a side-stream including the at least one alcohol and water
Implementation Method 2
a fractionation zone can be a column adapted to receive a feed including at least one alcohol, water, and at least one ketone
Data Source
AI summary
One exemplary embodiment can be a fractionation zone for an alkylation apparatus. The fractionation zone can be a column adapted to receive a feed including at least one alcohol, water, and at least one ketone. The column may provide an overhead stream including the at least one ketone and a side-stream including the at least one alcohol and water.