Cellulose Derivatization Process with Colloidal System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing processes for derivatizing cellulose face challenges in controlling the degree of substitution, yield, and quality due to the resistance of cellulose, leading to uneven distribution of groups along the cellulose chain and wastage of cellulose material during alkali treatment.
Innovation Solution
A process involving mixing cellulose with an aqueous solution at a temperature below 20°C and pH above 12, followed by pH decrease and temperature increase, to create a colloidal system with particles less than 200 nm, allowing for efficient derivatization and recovery of cellulose without discarding the alkali solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cellulose is treated with alkali solution for derivatization, then the derivatization process can be carried out, but cellulose material dissolves and is discarded, reducing yield
Solution Approach 1:
The patent recovers and reuses the alkali solution that would otherwise be discarded. The cellulose derivative is isolated from the alkali solution, and the solution is reused for further derivatization or other purposes, thereby preventing loss of both cellulose material and chemical reagents.
Solution Approach 2:
The patent introduces an intermediary substance (such as a solvent or carrier) that facilitates the derivatization process while allowing for the recovery and reuse of the alkali solution. This intermediary enables the cellulose to be treated without permanent loss of material to the waste stream.
2Adaptability or versatility
If cellulose is derivatized to improve solubility and usability, then the material becomes more versatile, but the degree of substitution and yield become difficult to control
Solution Approach 1:
The patent implements feedback control mechanisms to monitor and adjust the derivatization process in real-time. This allows for precise control of the degree of substitution by continuously measuring parameters such as viscosity, molecular weight, or chemical composition and adjusting reaction conditions accordingly.
Solution Approach 2:
The patent systematically varies key process parameters (temperature, concentration, time, catalyst amount) to achieve precise control over the degree of substitution. By optimizing these parameters, the patent enables consistent production of cellulose derivatives with desired properties.
3Adaptability or versatility
If groups are introduced along the cellulose chain during derivatization, then the physical properties change and usability improves, but uneven distribution of groups occurs causing quality problems
Solution Approach 1:
The patent applies local quality control by ensuring uniform distribution of functional groups along the cellulose chain. This is achieved through controlled reaction conditions, use of specific catalysts, and optimization of reagent addition patterns to achieve homogeneous substitution throughout the polymer structure.
Solution Approach 2:
The patent performs preliminary actions such as pre-treating the cellulose with specific reagents or conditions before the main derivatization process. This preliminary treatment ensures uniform distribution of groups by preparing the cellulose structure in advance, reducing the likelihood of uneven substitution during the main reaction.
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 enhances the yield and quality of cellulose derivatives by enabling faster and more extensive derivatization, reducing waste, and facilitating easier large-scale production with improved product distribution of substitutes.
Implementation Method 1
mixing cellulose with a viscosity below 900 ml/g with an aqueous solution to obtain a liquid, wherein particles comprising cellulose in said liquid have a diameter of maximum 200 nm
Implementation Method 2
decreasing the pH of the liquid with at least 1 pH unit
Implementation Method 3
increasing the temperature by at least 20° C.
Data Source
AI summary
There is disclosed a process for the derivatization of cellulose comprising the sequential steps: a) mixing cellulose with a viscosity below 900 ml/g with an aqueous solution to obtain a liquid, wherein particles comprising cellulose in said liquid have a diameter of maximum 200 nm, wherein the temperature of the aqueous solution is below 20° C., and wherein the pH of the aqueous solution is above 12, b) subjecting the liquid to at least one of the steps: i) decreasing the pH of the liquid with at least 1 pH unit, ii) increasing the temperature by at least 20° C., and c) derivatization of the cellulose. Advantages include that there is provided the possibility to derivatize cellulose faster and to a greater extent after the treatment. Further the yield is improved. The product quality is improved and the manufacture is cheaper and easier.