Supercritical Esterification Reactor for Polymerization Blockage
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Solution Overview
Problem
In the production of unsaturated carboxylic esters, the risk of polymerization blockage is high due to the unsaturated bonds in the reactants, which can lead to facility shutdowns and increased costs. Existing methods struggle to maintain high reaction conversion rates while minimizing polymerization risks and equipment costs.
Innovation Solution
A method involving a reactor packed with a solid catalyst, where unsaturated carboxylic acid and alcohol are continuously fed, and a vaporized organic solvent is concurrently introduced to maintain a gas-liquid mixed phase state, reducing the need for substantial heat supply and minimizing polymerization risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed bed reactor with solid catalyst is used to increase catalyst concentration and improve separation ease, then productivity is improved, but the risk of polymerization blockage increases due to liquid phase accumulation
Solution Approach 1:
The patent changes the physical state parameter of the reaction system from conventional liquid phase or gas-liquid mixed phase to supercritical fluid phase. By controlling temperature and pressure to achieve supercritical state, the reaction medium becomes a single homogeneous phase that prevents liquid accumulation, thereby maintaining high reaction conversion rate while eliminating polymerization blockage risk associated with fixed bed reactors.
Solution Approach 2:
The patent employs a composite approach by combining supercritical fluid technology with fixed bed reactor configuration. The supercritical carbon dioxide acts as both reaction medium and heat transfer fluid, enabling the fixed bed reactor to operate without the harmful liquid phase accumulation that causes polymerization, thus achieving both high productivity and reliability.
2Productivity
If temperature is increased to improve reaction rate, then productivity is improved, but polymerization risk increases due to higher temperature
Solution Approach 1:
The patent utilizes parameter change by transitioning to supercritical fluid phase, which allows operation at moderate temperatures (31.3°C以上) while achieving high reaction rates. The supercritical state provides excellent heat transfer properties that prevent localized overheating, thus maintaining high productivity without increasing polymerization risk associated with conventional high-temperature heating.
Solution Approach 2:
The patent applies pneumatic principles by using compressed carbon dioxide in supercritical state as the reaction medium. This pressurized fluid system enables efficient heat and mass transfer at lower temperatures compared to conventional thermal heating methods, achieving high reaction rates without the harmful effects of high temperature that promote polymerization.
3Productivity
If substantial heat supply is provided to maintain reaction temperature, then reaction conversion rate is improved, but equipment complexity and cost increase
Solution Approach 1:
The patent implements self-service heating by utilizing the heat of compression and the inherent thermal properties of supercritical carbon dioxide. The supercritical fluid itself serves as the heat transfer medium, eliminating the need for complex external heating systems. The system automatically maintains reaction temperature through the thermodynamic properties of the supercritical phase, reducing equipment complexity while achieving high reaction conversion rates.
Solution Approach 2:
The patent employs pneumatic heating principles where compressed supercritical carbon dioxide provides both the reaction medium and the heat source. The compression process itself generates heat, and the high heat capacity of the supercritical fluid enables efficient heat distribution throughout the reactor, reducing dependency on complex external heating equipment while maintaining high productivity.
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 method achieves a high reaction conversion rate for unsaturated carboxylic ester production while reducing the risk of polymerization blockage and maintaining low equipment costs and workload.
Implementation Method 1
a vaporized organic solvent is concurrently introduced to maintain a gas-liquid mixed phase state, reducing the need for substantial heat supply
Implementation Method 2
A general method for producing an unsaturated carboxylic ester is an esterification reaction using unsaturated carboxylic acid and alcohol as raw materials. In the esterification reaction, a catalyst is usually used to increase the reaction rate.
Data Source
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AI summary
An object of the present invention is to provide a method for producing an unsaturated carboxylic ester, wherein the risk of polymerization blockage is reduced and the required equipment cost and workload involved are kept low while maintaining a high conversion rate in an esterification reaction of unsaturated carboxylic acid. This object can be achieved by a method for producing an unsaturated carboxylic ester, which includes performing an esterification reaction using a reactor packed with a solid catalyst, wherein unsaturated carboxylic acid and alcohol are continuously fed to the reactor from an inlet thereof to form a fluid of the reaction solution in the reactor, and the vaporized organic solvent is continuously fed to the reactor from the inlet or a part near the inlet of the reactor.