Phyllosilicate Clay Adsorbent for Acetaldehyde Removal
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Solution Overview
Problem
Current acetic acid production processes face challenges in effectively removing acetaldehyde, a byproduct of carbonylation reactions, which contaminates the acetic acid product and requires improved removal methods.
Innovation Solution
A process involving the use of a phyllosilicate clay-based adsorbent to selectively reduce acetaldehyde content in the acetic acid production system by contacting the vapor stream or intermediate process streams under specific adsorption conditions, thereby separating and recycling the treated streams back to the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional distillation methods are used to separate acetic acid from reaction mixtures, then acetic acid can be recovered, but acetaldehyde contamination remains in the product
Solution Approach 1:
The patent introduces a phyllosilicate clay-based adsorbent as an intermediary substance that selectively binds acetaldehyde molecules from the acetic acid solution. This adsorbent acts as a mediator between the acetaldehyde contaminant and the acetic acid product, enabling selective removal of the aldehyde while preserving the desired product.
Solution Approach 2:
The phyllosilicate clay-based adsorbent utilizes its porous structure with specific surface area and pore size distribution to selectively adsorb acetaldehyde molecules. The porous material provides extensive surface area for adsorption sites while maintaining selectivity based on molecular size and polarity differences between acetaldehyde and acetic acid.
2Manufacturing precision
If existing aldehyde removal processes are applied, then some acetaldehyde can be reduced, but process complexity and cost increase
Solution Approach 1:
The patent extracts the acetaldehyde contaminant from the acetic acid solution using a simple adsorption process. The phyllosilicate clay-based adsorbent is directly contacted with the solution, allowing acetaldehyde to be taken out selectively without requiring complex multi-step separation sequences or additional processing equipment.
Solution Approach 2:
The patent changes the physical-chemical parameters of the system by introducing the adsorbent material with specific surface area, pore size, and chemical composition characteristics. These parameter changes enable selective acetaldehyde removal through adsorption equilibrium and kinetic differences, simplifying the overall separation process.
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
The process effectively reduces acetaldehyde concentration by up to 98% in the acetic acid product, enhancing the purity and efficiency of acetic acid production while maintaining substantial acetic acid levels.
Implementation Method 1
An intermediate process stream is contacted with a phyllosilicate clay-based adsorbent at adsorption conditions sufficient to produce a treated intermediate process stream
Implementation Method 2
flashing a reaction mixture discharged from the acetic acid production reactor into a vapor stream and a liquid stream
Implementation Method 3
The vapor stream is separated by distillation in a distillation column into: a product side stream comprising acetic acid and water; a bottoms stream; and an overhead stream
Implementation Method 4
The overhead stream in condensed into: a light aqueous phase stream, comprising methyl iodide, acetaldehyde, water, methyl acetate, and acetic acid; and a heavy organic phase stream
Data Source
AI summary
Processes for producing carboxylic acid are included herein. The processes include contacting methanol and carbon monoxide in the presence of a liquid reaction medium under carbonylation conditions sufficient to form a carbonylation product comprising acetic acid and acetaldehyde. At least a portion of the carbonylation product or a derivative thereof is contacted with a phyllosilicate clay-based adsorbent at adsorption conditions sufficient to selectively reduce a concentration of acetaldehyde present in the carbonylation product or a derivative thereof.