Heterogeneous Catalyst for Acrylic Acid Synthesis
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Solution Overview
Problem
Current methods for producing acrylic acid and other α,β-unsaturated carboxylic acids face challenges such as low yields and complex separation procedures, particularly in homogeneous processes, which hinder the efficient use of renewable resources like carbon dioxide.
Innovation Solution
The development of a heterogeneous catalytic process using an anionic polyelectrolyte system with associated metal cations, which facilitates the coupling of ethylene and carbon dioxide to form a metalalactone, allowing for easy separation and high yields of α,β-unsaturated carboxylic acids like acrylic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homogeneous catalytic processes are used for producing acrylic acid from carbon dioxide and ethylene, then the reaction efficiency can be improved, but the separation and isolation procedures become complex and yields decrease
Solution Approach 1:
The patent introduces a heterogeneous catalyst system consisting of a solid support material with immobilized metal complexes as an intermediary between the reactants (carbon dioxide and ethylene) and the product (acrylic acid). This solid catalyst mediator enables the reaction to proceed efficiently while allowing simple separation by filtration or decantation, resolving the contradiction between reaction efficiency and separation complexity
Solution Approach 2:
The patent changes the physical state parameter of the catalyst from homogeneous (soluble) to heterogeneous (insoluble solid), fundamentally altering the separation mechanism. This parameter change allows the catalyst to remain in the reaction mixture during the reaction phase for efficiency, then be easily removed by physical separation methods, thus resolving the contradiction between maintaining reaction efficiency and simplifying separation procedures
2Reliability
If traditional two-stage oxidation of propylene is used to produce acrylic acid, then the production process is well-established, but the availability of raw materials is limited compared to using carbon dioxide and ethylene
Solution Approach 1:
The patent develops a catalyst system that can universally catalyze the carboxylation of various olefins with carbon dioxide, not limited to propylene oxidation. This multi-functional catalyst enables the use of abundant raw materials like ethylene and carbon dioxide (from biomass or atmospheric capture) to produce acrylic acid and other α,β-unsaturated carboxylic acids, resolving the contradiction between process reliability and raw material availability by providing a versatile catalytic platform
3Ease of manufacture
If conventional methods are used for isolating α,β-unsaturated carboxylic acids, then the isolation process follows traditional procedures, but the ease of separation is difficult and time-consuming
Solution Approach 1:
The heterogeneous catalyst acts as a physical intermediary that remains separable from the reaction mixture, enabling simple filtration or decantation to isolate the product. This mediator approach eliminates the need for complex extraction, distillation, or chromatography procedures required in conventional homogeneous catalysis, thus resolving the contradiction between ease of manufacture and time loss by providing a simple physical separation mechanism
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 process enhances the ease of product separation and achieves surprisingly high yields of α,β-unsaturated carboxylic acids, overcoming the limitations of traditional methods by utilizing a renewable resource and improving the efficiency of the synthesis.
Implementation Method 1
the anionic polyelectrolyte can subsequently destabilize the metalalactone which eliminates a metal acrylate
Data Source
AI summary
This disclosure provides processes for forming acrylic acid and other α,β-unsaturated carboxylic acids and their salts, including catalytic processes, and catalyst systems for effecting the processes. For example, there is provided a catalyst system for producing an α,β-unsaturated carboxylic acid or a salt thereof, the catalyst system comprising: (a) a transition metal precursor compound comprising a Group 8-11 transition metal and at least one first ligand; (b) optionally, at least one second ligand; and (c) an anionic polyaromatic resin with associated metal cations. The catalyst system can further comprise (d) an olefin; (e) carbon dioxide (CO2); and (f) a diluent. Methods of regenerating the anionic polyaromatic resin with associated metal cations are described.