Agitation Mixer With Multiple Pipe Feed Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional agitation mixers face issues with polymer solution solidification upon contact with a poor solvent, leading to undesirable flocculent aggregation, non-uniform slurry formation, and reduced manufacturing efficiency during precipitation purification, resulting in polymer grains with varying diameters and impurities.
Innovation Solution
An agitation method and mixer with a multiple pipe feed structure, where a polymer solution and a poor solvent are fed through separate inner and outer pipes into a shearing clearance created by an impeller, ensuring controlled mixing and shearing to produce uniform polymer grains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the polymer solution and poor solvent are mixed just before the main body, then the precipitation purification can be performed, but the flocculent aggregation forms and the manufacturing efficiency decreases
Solution Approach 1:
The feed pipe is divided into multiple separate pipes (first feed pipe for polymer solution, second feed pipe for poor solvent) instead of using a single mixed feed pipe. This segmentation prevents premature mixing and flocculent aggregation while maintaining continuous processing capability.
Solution Approach 2:
The polymer solution is fed through the first feed pipe to the agitation vessel before the poor solvent is introduced through the second feed pipe. This preliminary action allows the polymer solution to be transported without premature precipitation, and the shearing effect is applied only after both fluids are introduced into the agitation vessel.
2Stability of the object's composition
If multiple inlets are formed at multiple locations in the agitation vessel to feed multiple fluids, then the diffusion effect is improved, but the shearing effect is lowered and the seal is affected
Solution Approach 1:
Both the polymer solution and poor solvent are fed through separate pipes that converge into a single inlet at the same location in the agitation vessel. This merging approach maintains the shearing effect generated by the impeller while still allowing controlled mixing of the two fluids.
3Manufacturing precision
If the polymer solution is fed in a partially solidified state, then the precipitation can occur, but the crystal core forms and the grain diameter becomes excessively large
Solution Approach 1:
The polymer solution is continuously fed through the first feed pipe to the agitation vessel in a liquid state, and the poor solvent is continuously fed through the second feed pipe. This continuous action ensures that the polymer solution remains in a soluble state during transport, and precipitation occurs only after the shearing effect is applied in the agitation vessel, producing uniform fine grains.
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 prevents flocculent aggregation, maintains manufacturing efficiency, and consistently produces polymer grains with uniform diameters and high purity by ensuring controlled contact and shearing of the polymer solution and poor solvent, reducing impurities and clogging risks.
Implementation Method 1
A shearing clearance is formed in the agitation vessel between the impeller and the feed pipe. The solution and the solvent are sheared by rotating the impeller to precipitate the solid substance while feeding the solution and the solvent into the shearing clearance from the outer pipe and the inner pipe.
Data Source
AI summary
An agitation method for mixing a solution and a solvent to precipitate a solid substance from the solution. The method includes preparing an agitation mixer including an agitation vessel, an impeller rotated in the agitation vessel, and a feed pipe connected to the agitation vessel and having a multiple pipe structure including an outer pipe and an inner pipe arranged in the outer pipe. A shearing clearance is formed in the agitation vessel between the impeller and the feed pipe. The method further includes shearing the solution and the solvent by rotating the impeller to precipitate the solid substance while feeding the solution and the solvent into the shearing clearance from the outer pipe and the inner pipe.