Sugar Refining via Ion Exchange and Chromatography
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Solution Overview
Problem
The traditional raw sugar refining process is inefficient due to high sugar losses in residual run-off syrups, which are rich in non-sucrose impurities, leading to increased energy and equipment costs in the recovery house's crystallization and centrifugation processes.
Innovation Solution
A system and process incorporating an ion exchange step followed by chromatography to fractionate low-invert sucrose from run-off syrups, recycling the product back to the melting unit, thereby eliminating the need for a conventional recovery house and reducing energy and equipment-intensive processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If traditional evaporative crystallization and centrifugation processes are used in the recovery house, then sugar recovery is achieved, but energy consumption and equipment complexity increase significantly
Solution Approach 1:
The patent replaces the traditional mechanical evaporative crystallization and centrifugation system with a chromatography-based separation system. The chromatography unit uses stationary phases and mobile phases to separate sucrose from impurities through adsorption and elution processes, eliminating the need for high-energy evaporation and mechanical centrifugation while achieving comparable sugar recovery rates
Solution Approach 2:
The patent changes the separation parameters from thermal/mechanical processes to chemical affinity-based processes. By controlling pH, ionic strength, and chromatography column conditions, the system achieves sugar recovery through chemical separation rather than physical evaporation and centrifugation, significantly reducing energy consumption
2Loss of substance
If traditional evaporative crystallization and centrifugation processes are used in the recovery house, then sugar recovery is achieved, but equipment complexity and operational costs increase
Solution Approach 1:
The patent replaces complex mechanical equipment (evaporators, centrifuges, multiple processing units) with a chromatography-based system consisting of columns, pumps, and detection systems. This substitution simplifies the overall process flow and reduces equipment maintenance requirements while maintaining effective sugar recovery
Solution Approach 2:
The patent extracts the sugar recovery function from the complex traditional recovery house system and implements it through a dedicated chromatography unit. This modular approach isolates the separation function into a single, well-defined process step, reducing overall system complexity and improving operational efficiency
3Loss of substance
If multiple crystallization strikes are performed to recover sugar from fine liquor, then sugar recovery improves, but non-sucrose impurities concentrate and production cost effectiveness decreases
Solution Approach 1:
The patent replaces multiple sequential crystallization strikes with a single chromatography separation process. The chromatography system selectively separates sucrose from non-sucrose impurities in one continuous operation, achieving high recovery rates without the impurity concentration problem that occurs when multiple crystallization cycles are performed
Solution Approach 2:
The patent introduces chromatography media (stationary phase and mobile phase) as intermediaries to facilitate selective sucrose separation. These intermediaries enable high-purity sugar recovery in a single pass through the chromatography column, avoiding the need for multiple crystallization strikes that would otherwise concentrate impurities
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 approach effectively recovers high-quality sucrose with high recovery levels, reducing sugar losses and operational costs by integrating ion exchange and chromatography steps to process raw sugar into high-purity crystalline sucrose.
Implementation Method 1
a second unit configured to receive the run-off syrup and to remove at least a portion of the divalent cations from the run-off syrup to produce a softened syrup
Implementation Method 2
removing at least a portion of invert compounds from the softened syrup using a differential migration through an ion exchange resin to produce a low-invert sucrose product
Implementation Method 3
a crystallization unit configured to fractionate high-purity crystalline sucrose from the fine liquor and to provide a run-off syrup
Data Source
Figure 1
Figure 2
AI summary
A system (10, 110) and process for refining raw sugar, comprising a melting unit (16, 116) configured to receive the raw sugar and an eluent to produce a melt liquor, a decolorization unit (24, 124) configured to receive the melt liquor and to produce a fine liquor, a crystallization unit (36, 136) configured to fractionate high-purity crystalline sucrose from the fine liquor and to provide a run-off syrup, a softening unit (46, 146) configured to receive the run-off syrup to produce a softened syrup, at least one separation unit (48, 148) configured to receive the softened syrup to produce a low-invert sucrose product, and a recycle line (52, 152) configured to relay the low-invert sucrose product from the at least one separation unit (48, 148) to the melting unit (16, 116).