Polyvalent Amine Cation Exchange Resin for Aldehyde Removal
Solution Overview
Problem
Current methods for removing aldehydes from carboxylic acid-containing liquids, such as acetic acid production processes, face challenges including complex and costly apparatus, loss of valuable components, and reduced yield due to non-selective removal of aldehydes, which leads to condensation and blockages, as well as incorporation of aldehydes into the acetic acid product.
Innovation Solution
A cation exchange resin ion-exchanged with a polyvalent amine in 1 to 99% of its total exchange capacity is used to selectively adsorb and remove aldehydes from carboxylic acid-containing liquids, preventing condensation and blockages, while preserving valuable components like methyl iodide and methyl acetate, and maintaining the quality of acetic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a distillation column with 40 steps or more is used to separate and remove acetaldehyde, then acetaldehyde removal efficiency is improved, but apparatus complexity and cost increase significantly
Solution Approach 1:
The patent extracts the harmful acetaldehyde component from the mixed liquid using a cation exchange resin that selectively adsorbs acetaldehyde. This extraction method replaces the complex multi-step distillation process with a single adsorption step, significantly simplifying the apparatus while maintaining high removal efficiency.
Solution Approach 2:
The patent employs a cation exchange resin with porous structure to adsorb acetaldehyde. The porous material provides large surface area and selective binding sites that enable efficient acetaldehyde removal without requiring complex distillation equipment.
2Manufacturing precision
If water absorption is used to remove acetaldehyde by taking advantage of its low boiling point and water solubility, then acetaldehyde removal is achieved, but valuable components methyl iodide and methyl acetate are dissolved and discharged together with acetaldehyde
Solution Approach 1:
The cation exchange resin exhibits selective adsorption properties, binding specifically to acetaldehyde while leaving methyl iodide and methyl acetate unaffected. This local quality of selective interaction enables acetaldehyde removal without co-loss of valuable components.
Solution Approach 2:
The patent converts the harmful effect of acetaldehyde into a beneficial selective adsorption process. The cation exchange resin's ability to selectively bind acetaldehyde transforms what was previously a problematic co-dissolution issue into a selective separation advantage.
3Manufacturing precision
If a cation exchange resin with polyvalent amine is used to remove aldehyde, then aldehyde removal is achieved, but other carbonyl compounds like carboxylic acids and ketones are also simultaneously removed causing reduction in yield
Solution Approach 1:
The patent applies local quality by controlling the degree of ion exchange (1-99% of total exchange capacity) to create selective binding sites. This partial ion exchange produces a resin with specific local properties that preferentially bind acetaldehyde while minimizing interaction with carboxylic acids and ketones.
Solution Approach 2:
The patent changes the parameter of ion exchange capacity (controlling it at 1-99% rather than 100%) to achieve selective adsorption. This parameter adjustment creates optimal conditions for acetaldehyde removal while preserving other carbonyl compounds.
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 solution effectively and efficiently removes aldehydes from carboxylic acid-containing liquids without complex apparatus, reducing the load on purification processes and stabilizing acetic acid quality by selectively adsorbing aldehydes, allowing for high-capacity aldehyde removal and regeneration of the adsorbent.
Implementation Method 1
a cation exchange resin ion-exchanged with a polyvalent amine in 1 to 99% by mol of the total exchange capacity
Implementation Method 2
adsorb and remove aldehyde in a carboxylic acid-containing liquid containing aldehyde
Data Source
AI summary
An aldehyde adsorbent that can adsorb and remove aldehyde from a carboxylic acid-containing liquid is provided. The aldehyde adsorbent is an aldehyde adsorbent for adsorbing aldehyde in a carboxylic acid-containing liquid containing aldehyde, including a cation exchange resin ion-exchanged with a polyvalent amine in 1 to 99% by mol of the total exchange capacity.