Acrylic Acid Oligomer Synthesis with Basic Catalyst
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Solution Overview
Problem
Existing methods for synthesizing acrylic acid oligomers require high polymerization inhibitor content, leading to stabilization issues that hinder their use in polymerization processes and lack controlled distribution of oligomeric species.
Innovation Solution
The process involves heating acrylic acid with a catalyst and a small amount of water at moderate temperatures, reducing polymerization inhibitor consumption and allowing for controlled oligomerization, resulting in a product with a lower stabilizer content and adjustable oligomeric distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high polymerization inhibitor content is used in the synthesis process, then the oligomers are highly stabilized, but this stabilization is detrimental to their use in polymerization processes
Solution Approach 1:
The patent changes the parameters of the synthesis process by using a basic catalyst (such as potassium carbonate or sodium hydroxide) instead of traditional acidic catalysts, and by controlling the water content and temperature. This results in oligomers with lower inhibitor content that retain stability while becoming suitable for polymerization processes.
Solution Approach 2:
The patent produces oligomers that replicate the desired stability properties needed for storage and handling, while simultaneously achieving the low inhibitor content necessary for polymerization applications. The basic catalyst system creates a product that copies the benefits of both high stability and high reactivity.
2Reliability
If traditional synthesis methods are used with high polymerization inhibitor content, then the oligomers are stabilized, but they lack controlled distribution of oligomeric species
Solution Approach 1:
By changing the catalyst type to basic and controlling reaction parameters such as temperature (50-200°C), water content (0.1-10% by weight), and residence time, the patent achieves both stability and precise control over the oligomeric species distribution, with most products having n values between 1 and 6.
3Productivity
If acrylic acid is heated at high temperature for oligomerization, then the reaction proceeds faster, but polymerization inhibitor consumption increases
Solution Approach 1:
The patent uses a basic catalyst system that enables oligomerization to proceed efficiently at moderate temperatures (50-200°C), significantly reducing polymerization inhibitor consumption compared to traditional high-temperature methods, while maintaining high productivity through optimized residence time and water content.
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 reduces the final inhibitor content in the oligomers, making them more suitable for polymerization processes and enabling the production of acrylic acid oligomers with a controlled distribution of oligomeric species, enhancing their application in acrylic polymer manufacturing.
Implementation Method 1
heating of acrylic acid at a temperature ranging from 50°C to 200°C in the presence of a catalyst, water, and at least one polymerization inhibitor
Implementation Method 2
the presence of a small amount of water in combination with an acidic or basic catalyst makes it possible to reduce the consumption of polymerization inhibitor during the reaction
Data Source
Figure 1
AI summary
The invention relates to a method for the synthesis of an oligomer of acrylic acid represented by the formula (I) in which n is a whole number from 1 to 10, characterised in that it comprises heating acrylic acid to a temperature of between 50°C and 200°C in the presence of a catalyst, water, and at least one polymerisation inhibitor. The formula (I) in which n is equal to 0 represents acrylic acid, the precursor for preparing the oligomer of acrylic acid.