Rotary Through-Flow Dryer for Sticky Cellulose Ether
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Solution Overview
Problem
Existing methods for drying wet cellulose ethers with high water content, such as agitated trough dryers and pneumatic dryers, face issues with adhesive growth and solidification inside the dryer, leading to reduced thermal efficiency and product contamination, and high operational costs.
Innovation Solution
The use of a rotary type through-flow dryer for continuous drying of wet cellulose ethers with water content above 50% by weight, which prevents adhesive growth and solidification, ensuring stable and efficient drying with reduced contamination and operational burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an agitated trough dryer is used to dry wet cellulose ether with high water content, then thermal efficiency is improved, but adhesive growth and solidification occur inside the dryer causing heat transfer area reduction and product contamination
Solution Approach 1:
The invention changes the operational parameters of the agitated trough dryer by controlling the water content of wet cellulose ether to be 50 wt% or more before drying, and maintaining the dryer temperature at 80°C or higher. This parameter control prevents adhesive growth while maintaining high thermal efficiency, resolving the contradiction between energy efficiency and adhesive prevention.
2Ease of operation
If a pneumatic dryer is used to dry wet cellulose ether, then adhesive material can be dried, but high power consumption increases drying cost and stable continuous operation becomes difficult due to attachment inside dryer or connecting pipes
Solution Approach 1:
The invention replaces the expensive and energy-intensive pneumatic dryer with a simpler agitated trough dryer that uses conventional thermal energy. By controlling the water content parameter, the system achieves effective drying without the high power consumption and operational instability associated with pneumatic dryers, making the process economically viable.
3Productivity
If wet cellulose ether with water content above 50% by weight is dried using conventional methods, then drying capability is achieved, but the material attaches to heat transfer parts causing decreased heat transfer area and reduced drying ability
Solution Approach 1:
The invention performs preliminary action by controlling the water content of wet cellulose ether to be 50 wt% or more before entering the dryer, and pre-heating the dryer to 80°C or higher. This preliminary preparation prevents the material from becoming excessively sticky during drying, thereby maintaining heat transfer area and drying ability throughout the process.
4Manufacturing precision
If frequent cleaning of the dryer is performed to remove adhesive deposits, then product quality is maintained, but operation rate decreases and disposal loss increases
Solution Approach 1:
The invention applies preliminary anti-action by controlling the drying process parameters (water content ≥50 wt%, temperature ≥80°C) to prevent adhesive growth and solidification in the first place. This preventive approach eliminates the need for frequent cleaning operations, thereby maintaining both high product quality and high operation rate without compromise.
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 allows for stable continuous drying of highly sticky wet cellulose ethers with high thermal efficiency, preventing contamination and reducing the need for frequent cleaning and disposal, thereby improving operational rates and product quality.
Implementation Method 1
a step of drying a wet cellulose ether having water content of more than 50% by weight in a rotary type through-flow dryer
Implementation Method 2
a rotary type through-flow dryer makes it possible to continuously and stably dry a highly sticky wet cellulose ether with high thermal efficiency
Data Source
AI summary
Provided is a method for producing a cellulose ether including a drying step capable of continuously and stably drying a highly adhesive wet cellulose ether with high thermal efficiency without causing adhesive growth and solidification of the wet cellulose ether in a dryer. More specifically, the method for producing a cellulose ether includes a step of drying a wet cellulose ether having water content of more than 50% by weight in a rotary type through-flow dryer.