Poly(meth)acrylic Acid Production from Methacrolein Streams
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Solution Overview
Problem
The existing processes for producing polycarboxylate ethers (PCEs) from (meth)acrolein synthesis streams are inefficient due to high dilution, presence of stabilizers and inhibitors that hinder free-radical polymerization, leading to long reaction times, low polymer yield, and complex handling requirements, which result in high production costs and suboptimal product quality.
Innovation Solution
A process involving free-radical polymerization of a (meth)acrylic acid-containing process stream from (meth)acrolein synthesis in the presence of water formed during oxidation, with a higher concentration of (meth)acrylic acid, using chain transfer agents and initiators like sodium persulfate, to produce poly(meth)acrylic acid, which is then esterified to enhance flow improver properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes are used to produce PCEs from (meth)acrolein synthesis streams, then production can proceed with existing infrastructure, but the process suffers from high dilution, presence of stabilizers and inhibitors that hinder free-radical polymerization, leading to long reaction times, low polymer yield, and complex handling requirements
Solution Approach 1:
The patent removes stabilizers and inhibitors from the (meth)acrylic acid-containing process stream before polymerization. This extraction of harmful components eliminates their hindering effect on free-radical polymerization, enabling faster reaction rates and higher polymer yields without the time losses associated with conventional processes that must tolerate these contaminants.
Solution Approach 2:
The patent changes the concentration parameter by producing poly(meth)acrylic acid at higher (meth)acrylic acid concentrations compared to conventional highly diluted processes. This parameter change increases polymer yield and reduces reaction time while the water formed during oxidation serves as the reaction medium, eliminating the need for large volumes of diluent.
2Reliability
If conventional processes are used with high dilution and stabilizers, then process stability can be maintained, but polymer yield decreases and reaction times increase
Solution Approach 1:
The patent performs preliminary removal of stabilizers and inhibitors before the polymerization process begins. This preliminary action ensures that the polymerization proceeds without interference from these substances, maintaining process stability while simultaneously enabling high polymer yields and reduced reaction times.
Solution Approach 2:
The patent converts the water formed during oxidation, which would normally be considered a byproduct requiring disposal, into the reaction medium for polymerization. This transforms a waste stream into a useful component that supports the polymerization process, maintaining stability while improving productivity.
3Object-affected harmful factors
If complex handling and disposal procedures are implemented for process streams, then environmental compliance can be achieved, but production costs increase
Solution Approach 1:
The patent makes the process stream self-service by using the water formed during oxidation as the reaction medium for polymerization. This eliminates the need for separate water addition and disposal steps, simplifying handling procedures while maintaining environmental compliance through efficient resource utilization.
Solution Approach 2:
The patent merges the oxidation process and polymerization process into a single integrated operation. The water formed during oxidation is immediately utilized as the reaction medium for polymerization, combining two separate process streams into one, thereby reducing handling complexity and disposal costs while maintaining environmental standards.
4Productivity
If high concentrations of (meth)acrylic acid are used in polymerization, then polymer yield increases, but the process becomes more sensitive to inhibitors and stabilizers
Solution Approach 1:
The patent extracts and removes stabilizers and inhibitors from the process stream before high-concentration polymerization. This removal eliminates the sensitivity issue, allowing the process to operate at high (meth)acrylic acid concentrations with improved polymer yield while maintaining process robustness through the absence of interfering substances.
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 results in a more robust, efficient, and cost-effective production of poly(meth)acrylic acid with improved flow-improving properties for concrete, offering higher polymer yield and active ingredient content, while reducing the need for complex handling and disposal costs.
Implementation Method 1
free-radical polymerization of a (meth)acrylic acid-containing process stream from (meth)acrolein synthesis
Implementation Method 2
using chain transfer agents and initiators like sodium persulfate
Implementation Method 3
which is then esterified to enhance flow improver properties
Data Source
AI summary
The present invention relates to a process for preparing a poly(meth)acrylic acid, characterized in that a (meth)acrylic acid-containing process stream from (meth)acrolein synthesis is subjected to free-radical polymerization. The invention also relates to the esterification of the polymer obtained to give a homopolymer or copolymer ester, and to the use thereof as additive, flow improver and water reducer.