Mixing Kneader Process for Randomly-Bonded Polysaccharides
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Solution Overview
Problem
Existing processes for preparing randomly-bonded polysaccharides face inefficiencies in water removal during polycondensation, leading to reduced reaction efficiency, increased color formation, and by-product formation, resulting in poor product quality and higher refining costs.
Innovation Solution
A process using a mixing kneader device with counter-acting blades at reduced pressures (50-400 hPa) and temperatures (160-220 °C) for simultaneous dehydration and polycondensation, ensuring effective removal of solution and reaction water, thereby achieving improved polymerization and reduced residual sugars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water removal during polycondensation is insufficient, then reaction efficiency is reduced and by-products form, but improving water removal leads to increased color formation and device complexity
Solution Approach 1:
The patent applies parameter changes by precisely controlling temperature (160-220°C) and pressure (50-400 hPa) parameters during polycondensation to optimize water removal efficiency while minimizing color formation. The mixing kneader device enables dynamic adjustment of these parameters to maintain optimal reaction conditions throughout the process.
Solution Approach 2:
The mixing kneader device acts as an intermediary system that facilitates effective water removal through its counter-acting blades mechanism. This intermediary device enables controlled water evacuation while maintaining reaction efficiency and minimizing harmful by-product formation.
2Productivity
If melt polymerization is used with solid reactants, then continuous processing is achieved, but mixing and blending becomes difficult and expensive
Solution Approach 1:
The patent changes the physical state parameter of reactants from solid to aqueous solution form, enabling easy mixing and blending in the liquid phase before polycondensation. This parameter change maintains continuous processing capability while dramatically improving ease of manufacture during the mixing stage.
Solution Approach 2:
Water acts as an intermediary medium that enables homogeneous mixing of reactants in the aqueous phase before polycondensation. The mixing kneader device further serves as a mechanical intermediary to ensure complete mixing and subsequent effective water removal.
3Duration of action of moving object
If reactants are held at melting temperature, then polymerization can occur, but oxidative decomposition and color formation increase
Solution Approach 1:
The patent creates an inert environment by operating under reduced pressure (50-400 hPa) during polycondensation, which minimizes oxidative decomposition. The vacuum conditions prevent contact with atmospheric oxygen, thereby reducing harmful oxidative reactions while maintaining polymerization efficiency.
Solution Approach 2:
The patent optimizes temperature parameters (160-220°C) to enable sufficient polymerization time while minimizing thermal decomposition and color formation. The controlled temperature range allows complete reaction without excessive heat exposure that would cause oxidative damage.
4Productivity
If separate evaporation and polycondensation steps are used, then water removal is thorough, but process complexity and time increase
Solution Approach 1:
The patent merges the evaporation and polycondensation steps into a single integrated process using the mixing kneader device. The device simultaneously performs polycondensation reaction and water removal through its counter-acting blades mechanism, eliminating the need for separate evaporation equipment and reducing process complexity.
Solution Approach 2:
The mixing kneader device exhibits multi-functionality by serving both as the reaction vessel for polycondensation and as the water removal mechanism through its mechanical action and reduced pressure operation. This universal device consolidates multiple process functions into one unit.
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
The process results in polysaccharides with higher mean average molecular weight, lower DP1 and DP2 content, reduced color formation, and enhanced thermal and chemical stability, compared to standard commercial products.
Implementation Method 1
kneading and mixing the fed ingredients in order to remove the solution water through which the fed ingredients are dehydrated to an essentially anhydrous syrup
Implementation Method 2
polycondensating the essentially anhydrous syrup by continuously kneading it in the said mixing kneader device in order to remove the reaction (polycondensation) water
Implementation Method 3
The mixing kneader device is heated to a temperature of between 160°C and 220°C at a reduced pressure of between 50-400 hPa
Data Source
AI summary
The invention relates to a process for preparing a randomly-bonded polysaccharide, comprising as ingredients a saccharide, a polyol and an acid serving as a catalyst, the process comprising the steps of feeding the ingredients into a reactor in order to dehydrate the fed ingredients to an essentially anhydrous syrup, polycondensating the essentially anhydrous syrup at elevated temperatures in the said reactor while removing the reaction water, wherein the reactor is a mixing kneader device with counter-acting blades, wherein during the feeding step the saccharide, the polyol and the acid serving as catalyst are simultaneously or consecutively fed to the reactor, and in that during the dehydratation and polycondensation step the free water and reaction water is removed from the mixing kneader device by kneading and mixing the fed ingredients and the subsequent essentially anhydrous syrup under reduced pressure in the reactor, and during the polycondensation the essentially anhydrous syrup is continuously kneaded in the kneader reactor until the required degree of polymerisation is obtained.