Particulate Polymer Drying via Roller Press Segmentation
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Solution Overview
Problem
Existing processes for drying particulate polymers are energy-intensive, particularly due to the use of thermal drying apparatuses like fluidized bed dryers, which result in high energy costs and capital expenditures.
Innovation Solution
A process involving mechanical predrying with a roller press to reduce solvent content from 60 wt % to 20 wt % followed by end-drying with a fluidized bed dryer to achieve a solvent content of 0 wt % to 15 wt %, significantly reducing energy consumption and capital expenditure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal drying apparatuses such as fluidized bed dryers are used to achieve complete drying of particulate polymers, then drying results are improved, but energy costs increase significantly
Solution Approach 1:
The drying process is divided into two distinct stages: mechanical predrying and thermal end-drying. The mechanical predrying stage removes the bulk of solvent (from 60-90 wt% down to 20-50 wt%) using a roller press, while the thermal end-drying stage completes the drying (down to 0-15 wt% residual solvent). This segmentation allows each stage to operate optimally for its specific function, reducing overall energy consumption.
Solution Approach 2:
Mechanical predrying is performed as a preliminary action before thermal end-drying. By removing the majority of solvent mechanically first, the subsequent thermal drying process deals with much less moisture, significantly reducing the energy required for complete drying.
2Manufacturing precision
If thermal drying apparatuses are used to achieve complete drying, then drying effectiveness is improved, but capital expenditure on plant technology increases
Solution Approach 1:
The drying system is segmented into a mechanical predrying unit (roller press) and a thermal end-drying unit (fluidized bed dryer). This segmentation allows the use of simpler, less expensive equipment for the bulk drying operation, reducing overall capital expenditure while maintaining drying effectiveness.
3Use of energy by moving object
If mechanical predrying with a roller press is used to reduce solvent content, then energy costs are reduced, but the drying process becomes more complex
Solution Approach 1:
The roller press acts as an intermediary device between the precipitation step and the final thermal drying. It performs the function of bulk solvent removal mechanically, bridging the gap between wet precipitation and complete thermal drying, thereby reducing the energy load on the thermal dryer.
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 reduces energy costs by more than 50% and halves the capital expenditure on plant technology while maintaining product quality, achieving comparable drying results to traditional methods.
Implementation Method 1
mechanically predrying the particulate polymer to a content of the solvent (S1) of from 20 wt % to 50 wt % based on the total weight of particulate polymer and solvent (S1), wherein the mechanical predrying in step b) is carried out with a roller press
Implementation Method 2
mechanically predrying the particulate polymer... with a roller press
Implementation Method 3
end-drying the particulate polymer to a content of the solvent (S1) of from 0 wt % to 15 wt % based on the total weight of particulate polymer and solvent (S1)
Data Source
AI summary
The present invention relates to a process for drying particulate polymers, comprising the steps of:a) providing a particulate polymer comprising from 60 wt % to 90 wt % of at least one solvent based on the total weight of particulate polymer and solvent,b) mechanically predrying the particulate polymer to a content of the at least one solvent of from 20 wt % to 50 wt % based on the total weight of particulate polymer and solvent, wherein the mechanical predrying in step b) is carried out with a roller press, andc) end-drying the particulate polymer to a content of the at least one solvent of from 0 wt % to 15 wt % based on the total weight of particulate polymer and solvent, wherein the particulate polymer is a polymer comprising repeating units of formulae I, II and/or IIIThe present invention further relates to a process for working up particulate polymers.