Crystallization Control via Impedance and Temperature Sensors
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Solution Overview
Problem
Chemical process engineering faces inefficiencies in product purification through crystallization due to impurity accumulation and energy wastage, as existing methods struggle to maintain optimal temperature control and monitor crystallization processes effectively, leading to reduced product purity and increased resource waste.
Innovation Solution
A device equipped with temperature and impedance sensors connected to a control and evaluation unit, allowing for online monitoring and control of crystallization processes by measuring total product concentration, solid fraction, dissolved product fraction, and impurity fraction, ensuring efficient crystallization and maintaining optimal process conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the solution is reused to dissolve the next portion of contaminated product, then resource efficiency is improved, but impurity concentration accumulates and reduces product purity
Solution Approach 1:
The patent implements an online monitoring system using temperature and impedance sensors that continuously measure crystallization parameters and feed this information back to the control unit. This feedback mechanism enables real-time detection of impurity accumulation in reused solvent, allowing the system to optimize the reuse cycle and maintain product purity while maximizing solvent utilization.
Solution Approach 2:
The system dynamically adjusts process parameters (temperature, crystallization time, solvent composition) based on real-time measurements of impurity concentration. By changing these parameters adaptively, the system can extend the useful life of reused solvent while preventing impurity accumulation from compromising product quality.
2Manufacturing precision
If the product is held at the target temperature for longer time, then crystallization completeness is improved, but energy consumption increases
Solution Approach 1:
The control unit receives real-time data from temperature and impedance sensors monitoring the crystallization process. Based on this feedback, the system determines when crystallization is complete and automatically stops the cooling process, preventing unnecessary energy consumption while ensuring complete crystallization.
Solution Approach 2:
The online monitoring system enables the crystallization process to self-regulate. The system automatically detects the endpoint of crystallization through impedance changes and adjusts the holding time accordingly, eliminating the need for manual intervention or fixed-time protocols that would waste energy.
3Productivity
If temperature ramps are applied rapidly during crystallization, then process time is reduced, but control precision deteriorates
Solution Approach 1:
The patent implements dynamic temperature control that adapts the cooling rate based on real-time process conditions. The system uses impedance measurements to detect crystallization stage and automatically adjusts the temperature ramp rate, enabling both rapid overall cooling and precise control during critical crystallization phases.
Solution Approach 2:
The system dynamically changes temperature parameters (cooling rate, holding temperature, ramp speed) based on real-time feedback from sensors. This allows the process to achieve both high productivity through rapid initial cooling and high precision during the crystallization phase by adjusting the temperature profile adaptively.
4Productivity
If online monitoring of crystallization process is implemented, then process efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs multi-functional sensors that simultaneously measure multiple parameters (temperature and electrical impedance) with a single device. The control unit integrates data from both sensors to provide comprehensive process monitoring and control, reducing the overall system complexity compared to using separate specialized sensors for each parameter.
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 solution enables precise monitoring and control of the crystallization process, preventing impurity accumulation and maintaining product purity, thereby enhancing the efficiency of the purification process and reducing energy wastage.
Implementation Method 1
an impedance sensor (9) are arranged at at least two locations of the device (1), wherein the temperature sensors (8) and the impedance sensors (9) are connected to the control and evaluation unit (7)
Implementation Method 2
a temperature sensor (8) and an impedance sensor (9) are arranged at at least two locations of the device (1), wherein the temperature sensors (8) and the impedance sensors (9) are connected to the control and evaluation unit (7)
Implementation Method 3
a crystallization unit (3) in which the product crystallizes during operation and thus forms a solid fraction (β)
Implementation Method 4
If the solution or suspension in a crystallization unit is brought to a supersaturated state, for example by cooling or solvent evaporation, crystal formation or crystal growth is stimulated
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Described and illustrated is a device (1) for purifying a product by means of crystallization, wherein the product is preferably produced by a chemical process and wherein the product has an impurity content δ, comprising a feed unit (2) with a solvent, wherein in operation the product is fed to the device (1) via the feed unit (2) so that the total product concentration α is present in the solvent in the feed unit (2), a crystallization unit (3) in which the product crystallizes in operation and thus forms a solid fraction β, wherein a further fraction of the product is present as a dissolved product fraction γ, a separation unit (4) in which the crystallized product is separated from the solvent or the suspension, and a temperature control unit (6) by which the temperature can be controlled at least in the feed unit (2) and/or the crystallization unit (3).and further comprising a control and evaluation unit (7), characterized in that at least one temperature sensor (8) and one impedance sensor (9) are arranged at at least two locations of the device (2), wherein the temperature sensors (8) and the impedance sensors (9) are connected to the control and evaluation unit (7) and that the control and evaluation unit (7) is configured such that, during operation, it determines the total product concentration α and/or the concentration of the solid fraction β and/or the concentration of the dissolved product fraction γ and/or the concentration of the impurity fraction δ, taking into account the measured values of the temperature sensors and the impedance sensors.