Continuous Aromatic Oligomer Production via Integrated Water Removal
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Solution Overview
Problem
Existing methods for producing aromatic cyclic oligomers are complex, expensive, and have low productivity due to the need for multistage processes and low monomer concentrations, which hinder efficient production of these valuable polymers.
Innovation Solution
A continuous production method and apparatus that uses solution polycondensation in a series of reaction vessels, where a polymerization solvent and reaction raw materials are supplied, a polymerization reaction is performed, and water is removed in the gas phase, with the reaction mixture successively moved through the vessels, optimizing solvent and raw material ratios to enhance yield and simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multistage process using separate vessels for water removal, initial reaction, and reaction mixture preparation is used, then the production of aromatic cyclic oligomer can be achieved, but the apparatus becomes complex and expensive
Solution Approach 1:
The patent combines multiple separate vessels (water removal vessel, raw material vessel, reaction vessel) into a single integrated reaction vessel that performs all functions simultaneously. The reaction vessel is equipped with both a condenser for water removal and a heating mechanism for the reaction, eliminating the need for separate vessels and reducing apparatus complexity while maintaining production capability.
Solution Approach 2:
The single reaction vessel serves multiple functions: it acts as the raw material vessel, reaction vessel, and water removal vessel all at once. The vessel is designed with integrated components (condenser, heating element, stirring mechanism) that enable it to perform multiple operations simultaneously, thereby simplifying the overall apparatus structure.
2Reliability
If the monomer concentration at the time of charging raw materials is extremely low, then the reaction can proceed, but the production time becomes excessively long and productivity is diminished
Solution Approach 1:
The patent applies preliminary action by adding a polymerization catalyst to the reaction vessel before charging the raw materials. This pre-preparation of the catalytic environment enables the reaction to proceed more rapidly once the raw materials are introduced, thereby reducing the overall production time while ensuring complete reaction.
Solution Approach 2:
The patent changes the parameter of monomer concentration by maintaining an extremely low concentration (0.01 mol/L or less) throughout the reaction process. This parameter change, combined with the use of a polymerization catalyst, allows the reaction to proceed efficiently despite the low concentration, thereby improving productivity without sacrificing reaction completeness.
3Device complexity
If a single reaction vessel with integrated water removal and reaction functions is used, then the apparatus becomes simple and inexpensive, but the process must efficiently handle both polymerization and water removal simultaneously
Solution Approach 1:
The patent segments the reaction process into distinct functional zones within the single reaction vessel: the lower portion contains the liquid reaction mixture with monomers and catalyst, while the upper portion contains the gas phase space where water vapor is removed by the condenser. This spatial segmentation allows simultaneous polymerization and water removal to occur efficiently in different zones of the same vessel.
Solution Approach 2:
The patent utilizes phase transitions by allowing water produced during polymerization to evaporate into the gas phase, where it is then condensed and removed by the condenser. This phase transition mechanism enables efficient water removal from the reaction mixture without requiring separate equipment, simplifying the apparatus while maintaining process effectiveness.
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 cost-effective, simple, and efficient method for producing aromatic cyclic oligomers with improved space-time yield, reducing production time and costs while maintaining high quality and yield.
Implementation Method 1
performing a polymerization reaction in the polymerization solvent in at least one of the reaction vessels (1a to 1c) to form a reaction mixture
Implementation Method 2
removing at least a part of water in gas phase parts of the reaction vessels (1a to 1c) from the reaction vessels
Data Source
Figure 1~2
Figure 3
AI summary
Provided is a continuous production method and a continuous production apparatus utilizing the solution polycondensation of aromatic cyclic oligomers, which achieve a good space-time yield and are inexpensive and simple. The continuous production method includes: (a) supplying a polymerization solvent and a reaction raw material to a continuous production apparatus (100) including a plurality of reaction vessels (1a to 1f); (b) performing a polymerization reaction in the polymerization solvent in the reaction vessels to form a reaction mixture (9a to 9f); (c) removing water in gas phase parts of the reaction vessels from the reaction vessels; and (d) successively moving the reaction mixture to each of the reaction vessels; the steps (a), (b), (c), and (d) being performed in parallel; wherein an amount of the polymerization solvent in the reaction vessel positioned furthest downstream in a movement direction of the reaction mixture is not less than 1 L and not greater than 50 L per 1 mol of arylene units in the reaction raw material; the respective gas phase parts of the plurality of reaction vessels communicate with one another; and a pressure of each of the gas phase parts is uniform.