Simulated Moving Bed Chromatography for Polyol Purification
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Solution Overview
Problem
Current methods for producing and purifying 1,2,5,6-hexanetetrol from sugar alcohol hydrogenolysis reactions are inefficient and require harsh conditions, lacking effective protocols for high-volume throughput and high-purity isolation.
Innovation Solution
A method involving chromatographic techniques using a non-functionalized resin for the separation and purification of 1,2,5,6-hexanetetrol and other polyols from hydrogenolysis reaction mixtures, employing simulated-moving-bed chromatography for continuous and high-throughput processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liquid-liquid extraction methods are used for purifying 1,2,5,6-hexanetetrol, then the purification process can be performed with simple equipment, but the manufacturing precision and purity of the product are insufficient
Solution Approach 1:
The patent replaces conventional liquid-liquid extraction (mechanical separation based on solubility differences) with simulated moving bed chromatography (separation based on differential adsorption). This substitution enables high-purity isolation of 1,2,5,6-hexanetetrol by exploiting its specific interaction with chromatographic resin, achieving 99.9% purity that was unattainable with traditional extraction methods
Solution Approach 2:
The patent changes the separation mechanism from bulk-phase extraction to surface-based chromatographic adsorption. By adjusting chromatographic parameters (mobile phase composition, flow rate, resin type), the process achieves selective retention and separation of 1,2,5,6-hexanetetrol from complex reaction mixtures, transforming the separation approach to achieve superior purity
2Productivity
If batch processing methods are used for hydrogenolysis reaction and purification, then the process can be performed with simple equipment, but the productivity is low
Solution Approach 1:
The patent implements continuous simulated moving bed chromatography to replace batch processing. The system operates continuously with multiple columns in sequence, maintaining constant separation action without interruption. This continuous operation dramatically increases productivity by eliminating repeated loading, separation, and unloading cycles inherent in batch methods
Solution Approach 2:
The patent introduces dynamic operation where the chromatographic system continuously cycles through different operational modes (loading, washing, eluting, regenerating) across multiple columns. This dynamic switching enables continuous product recovery while maintaining separation efficiency, transforming static batch processing into a flowing continuous system
3Productivity
If harsh reaction conditions (high temperature and pressure) are used for hydrogenolysis, then the reaction rate and yield are improved, but the energy consumption and operational complexity increase
Solution Approach 1:
The patent changes the reaction conditions from extreme (250°C, 300 atm) to moderate parameters by using improved catalyst systems and optimized reaction environments. The modified approach achieves comparable or superior yields at lower temperatures and pressures, reducing energy input requirements while maintaining productive reaction rates
Solution Approach 2:
The patent employs readily available, inexpensive catalyst materials (copper-chromium oxide, nickel, ruthenium) that can operate under milder conditions than traditional catalysts. These catalysts enable the reaction to proceed efficiently at reduced energy input, replacing the need for extreme conditions that would require expensive specialized equipment
4Manufacturing precision
If multiple separation steps are used for purifying reaction products, then the purity can be improved, but the loss of time and operational complexity increase
Solution Approach 1:
The patent merges multiple sequential purification operations into a single simulated moving bed chromatographic system. The continuous chromatographic process performs filtration, separation, and concentration in one integrated operation, eliminating the time required to transfer materials between separate equipment and achieving high purity in a single pass
Solution Approach 2:
The chromatographic resin performs multiple functions simultaneously: it acts as a filter for particulate removal, a separation medium for component differentiation, and a concentration device for product recovery. This multi-functionality consolidates what would traditionally require separate filtration, extraction, and evaporation steps into one universal separation process
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 enables efficient and cost-effective single-step separation, achieving yields of 40-92% and purities of 70-99.9% for 1,2,5,6-hexanetetrol, surpassing conventional methods in efficiency and cost-effectiveness.
Implementation Method 1
contacting a mixture comprising the products of sugar alcohol hydrogenolysis and other C1-C6 alcohols and polyols with a resin adapted for chromatographic use, under conditions where the products preferentially associates with the resin relative to other components in the mixture
Implementation Method 2
the products preferentially associates with the resin relative to other components in the mixture
Implementation Method 3
employing simulated-moving-bed chromatography for continuous and high-throughput processing
Data Source
AI summary
A method of isolating and purifying a product of sugar alcohol or anhydrosugar alcohol hydrogenolysis from a reaction mixture containing sorbitans, 1,2,4-butanetriol (BTO), 1,2,5,6-hexanetetrol (HTO), among other byproducts of a hydrogenolysis reaction of a sugar alcohol and/or a mono- or di-dehydrative product of a sugar alcohol is described. The method involves contacting the mixture having the products of sugar alcohol or anhydrosugar alcohol hydrogenation and other C1-C6 alcohols and polyols with a resin material adapted for chromatography under conditions where the products preferentially associates with the resin relative to other components in the mixture, and eluting products from the resin with a solvent. The method suggests a way for separation of aliphatic polyols generated from the hydrogenolysis of sugar alcohols or anhydrosugar alcohols.