Mill-Drying Microcrystalline Cellulose to Cut Energy Use
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Solution Overview
Problem
The existing methods for drying microcrystalline cellulose (MCC) wet-cake, such as spray-drying, are energy-intensive and costly due to the high water content required, and they often necessitate dilution of the MCC, which can affect the product's properties like particle size, bulk density, and flowability.
Innovation Solution
A process involving mill-drying of MCC with a moisture content of 20-75% in a single device capable of both milling and drying, allowing for control of particle sizes and morphology, and achieving a moisture content of less than 20% with improved bulk density and flowability, reducing water and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spray-drying is used to dry MCC wet-cake, then the desired commercial grades of MCC are obtained with controlled particle size and morphology, but very high water and energy expenses are incurred due to the large amount of water to be added and subsequently evaporated
Solution Approach 1:
The invention changes the fundamental parameter of the drying process from spray-drying (requiring high water content slurry) to mill-drying (accepting lower water content wet-cake directly). This parameter change allows processing MCC with 20-75% moisture content directly, eliminating the need to add and evaporate large amounts of water, thus significantly reducing energy consumption while maintaining particle size control through the milling action
Solution Approach 2:
The invention replaces the thermal evaporation-based spray-drying system with a mechanical milling-based drying system. The mill-drying device uses mechanical force to both dry and size-reduce the MCC simultaneously, substituting the energy-intensive thermal evaporation process with a more efficient mechanical process that achieves both drying and particle size control in one operation
2Manufacturing precision
If spray-drying is used to dry MCC wet-cake, then the desired commercial grades of MCC are obtained with controlled particle size and morphology, but spray-drying equipment is very costly
Solution Approach 1:
The invention merges the drying function and particle size reduction function into a single mill-drying device. This combination eliminates the need for separate spray-drying equipment and subsequent milling equipment, reducing overall equipment complexity and capital investment while maintaining the ability to control particle size and morphology of the final MCC product
Solution Approach 2:
The invention replaces expensive, complex spray-drying equipment with simpler, more affordable mill-drying equipment. The mill-drying device uses straightforward mechanical components (milling elements, drying chamber) that are less costly and more easily maintained compared to the complex spray-drying system with its nozzles, heating elements, and control systems
3Ease of manufacture
If MCC wet-cake is diluted with water prior to spray-drying, then spray-drying can be performed, but the MCC product properties like bulk density and flowability are affected
Solution Approach 1:
Instead of diluting MCC wet-cake with water to enable spray-drying (conventional approach), the invention inverts the logic by using mill-drying to directly process the concentrated wet-cake with 20-75% moisture content. This inversion eliminates the dilution step that compromises product properties like bulk density and flowability, while still achieving the desired particle size and morphology through the milling action during drying
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 process produces MCC with comparable or improved particle sizes, bulk density, and flowability to spray-dried MCC while significantly reducing energy and water usage, and lowering capital investment by using less expensive and space-efficient equipment.
Implementation Method 1
mill-drying the moist MCC in a single device capable of milling and drying in combination
Implementation Method 2
mill-drying the moist MCC in a single device capable of milling and drying in combination
Data Source
AI summary
A mill dried microcrystalline cellulose (MCC) is obtained in a process comprising the steps of a) providing MCC having a moisture content of from 20 to 75 percent, based on the total weight of the moist MCC; and b) mill-drying the moist MCC in a single device capable of milling and drying in combination. The process can provide mill-dried microcrystalline cellulose having similar particle size distribution (LEFI, DIFI and EQPC) and moisture content as the corresponding spray-dried microcrystalline cellulose. The process can provide mill-dried microcrystalline cellulose having a higher tapped/untapped bulk density and/or a lower Carr index, while keeping a similar moisture content, as the corresponding spray-dried microcrystalline cellulose.