Continuous (Meth)Acrylate Ratio Control Using NIR Feedback
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Solution Overview
Problem
Existing methods for preparing (meth)acrylates face challenges in controlling the molar ratio of alcohol and (meth)acrylic acid in the reactor, leading to fluctuations in yield and the formation of impurities like Michael adducts, especially when using an equimolar ratio, and require complex and unsafe sampling for ratio adjustments.
Innovation Solution
A continuous process using closed-loop control units adjusted by sensors to maintain the molar ratio of alcohol and (meth)acrylic acid, employing NIR spectroscopy for real-time monitoring and control, allowing for automated and economical production of high-purity (meth)acrylates without manual sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the esterification is carried out with an essentially equimolar ratio of alcohol and (meth)acrylic acid, then the formation of Michael adducts is minimized, but fluctuations in the molar ratio lead to a decrease of the (meth)acrylate output
Solution Approach 1:
The patent implements a feedback control system where a sensor continuously monitors the molar ratio of alcohol and (meth)acrylic acid in the reactor, and a control unit adjusts the feed rates of the reactants based on this monitoring. This closed-loop feedback mechanism maintains the optimal equimolar ratio, preventing fluctuations that would reduce productivity while avoiding conditions that promote harmful byproducts like Michael adducts.
2Productivity
If one feedstock is used in excess to remove water and (meth)acrylate from the equilibrium, then economical conversions are obtained, but the formation of ethers from starting alcohols is promoted
Solution Approach 1:
The feedback control system continuously monitors the molar ratio of reactants and adjusts feed rates to maintain equimolar proportions. This prevents the use of excess alcohol that would lead to ether formation, while still achieving economical conversions by removing water and (meth)acrylate from the equilibrium through controlled reaction conditions and product separation.
3Ease of operation
If the molar ratio of alcohol and (meth)acrylic acid is not controlled, then the process is simpler to operate, but the (meth)acrylate yield decreases and waste increases
Solution Approach 1:
The system employs automated control units and sensors that self-regulate the molar ratio of reactants without requiring complex manual intervention. The control unit automatically adjusts feed rates based on real-time sensor data, maintaining optimal reaction conditions and maximizing yield while minimizing waste, thus achieving high productivity with relatively simple operation.
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 process effectively controls the molar ratio, enhancing yield and purity while minimizing waste and polymer formation, ensuring safety and cost-effectiveness by eliminating the need for manual sampling and using simpler, automated control mechanisms.
Implementation Method 1
the sensor (S) determines the molar ratio of the unreacted (meth)acrylic acid and the unreacted alcohol contained in the product mixture
Data Source
AI summary
The present invention relates to a process for the continuous preparation of (meth)acrylate by reacting an alcohol with a (meth)acrylic acid using at least one control unit which is closed-loop controlled by a sensor (S).