Propionic Acid Separation from Acrylic Acid via Ion Exchange
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing acrylic acid from biobased or propane-based feedstocks often result in excessive propionic acid impurities, which are difficult and costly to remove, affecting the purity and yield of the final product.
Innovation Solution
A process combining chromatography and crystallization to separate and remove propionic acid from acrylic acid compositions, with optional hydrogenation or oxidative dehydrogenation of residual acrylic acid to enhance propionic acid production or purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional distillation methods are used to separate propionic acid from acrylic acid, then separation can be achieved, but the process becomes costly and complex due to the similar boiling points of the two acids
Solution Approach 1:
The patent changes the separation parameter from thermal (distillation based on boiling point difference) to chemical (ion exchange based on acid strength differences). By using ion exchange resins that selectively bind propionic acid over acrylic acid, the process achieves effective separation without relying on the difficult-to-exploit boiling point difference between the two acids.
Solution Approach 2:
The patent introduces an ion exchange resin as an intermediary substance that mediates the separation process. The resin acts as a selective binder that temporarily holds propionic acid while allowing acrylic acid to pass through, enabling separation without direct thermal processing of the acid mixture.
2Productivity
If conventional oxidative processes are used to produce acrylic acid from propylene or propane, then production efficiency is maintained, but excessive propionic acid impurities are generated that are difficult and costly to remove
Solution Approach 1:
The patent converts the harmful propionic acid impurity into a recoverable resource. By using ion exchange chromatography, propionic acid is selectively captured and can be desorbed in concentrated form for reuse or sale, transforming from a waste removal problem into a value recovery opportunity.
Solution Approach 2:
The patent implements a recovery system where propionic acid is not simply discarded but captured by the ion exchange resin and then recovered through desorption. This allows the impurity to be separated, concentrated, and potentially reused in other processes or sold as a byproduct.
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 effectively reduces propionic acid content in acrylic acid products, improving their purity and yield while minimizing the economic and environmental impacts associated with traditional separation methods.
Implementation Method 1
A process combining chromatography and crystallization to separate and remove propionic acid from acrylic acid compositions
Implementation Method 2
A process combining chromatography and crystallization to separate and remove propionic acid from acrylic acid compositions
Implementation Method 3
with optional hydrogenation or oxidative dehydrogenation of residual acrylic acid to enhance propionic acid production or purity
Implementation Method 4
with optional hydrogenation or oxidative dehydrogenation of residual acrylic acid to enhance propionic acid production or purity
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Methods are provided for producing a reduced propionic acid content acrylic acid product having a propionic acid content comparable to acrylic acid products from the conventional two stage oxidation of propylene, but wherein the acrylic acid has been produced by oxidation of propane, by dehydration of glycerol to an acrolein intermediate and oxidation of the acrolein intermediate to acrylic acid, by dehydration of lactic acid or one or more lactate esters or by any combination of these source processes and otherwise is characterized by having excess propionic acid compared to a glacial acrylic acid conventionally prepared from propylene.