Sucralose-6-Acetate Purification by Gradient Solvent Crystallization
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Solution Overview
Problem
Current methods for purifying sucralose-6-acetate suffer from low product purity, high solvent consumption, and inefficient separation of by-products due to the use of a single solvent with high solubility for multiple chlorinated products, leading to poor crystallization efficiency and multiple recrystallization steps.
Innovation Solution
A method involving gradient crystallization using ethyl acetate as the initial solvent, with the gradual addition of a low-polarity solvent to reduce the overall polarity of the solution during cooling crystallization, followed by recrystallization with a mixed solvent of ethyl acetate and low-polarity solvent to achieve high purity sucralose-6-acetate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ethyl acetate is used as a single solvent for purification, then high solubility for multiple chlorinated products is achieved, but poor separation of by-products and low product purity result
Solution Approach 1:
The patent uses a composite solvent system comprising ethyl acetate and a low-polarity solvent (such as n-pentane, cyclopentane, n-hexane, cyclohexane, n-heptane, or cycloheptane) in a volume ratio of (0.5-1):1 to (1.5-2). This composite solvent system combines the high solubility capability of ethyl acetate with the selective precipitation properties of the low-polarity solvent, enabling effective separation of sucralose-6-acetate from chlorinated by-products while maintaining high product purity in a single crystallization step.
2Manufacturing precision
If multiple recrystallization steps are performed to improve purity, then product purity increases, but solvent consumption and process complexity increase
Solution Approach 1:
The patent optimizes the polarity parameter of the solvent system by combining ethyl acetate with a low-polarity solvent, and controls the volume ratio parameter within (0.5-1):1 to (1.5-2). This parameter optimization enables effective by-product separation and high-purity product crystallization in a single step, eliminating the need for multiple recrystallization operations and significantly reducing solvent consumption.
3Manufacturing precision
If multiple recrystallization steps are used to achieve high purity, then product quality improves, but the number of crystallization times increases
Solution Approach 1:
The composite solvent system of ethyl acetate and low-polarity solvent creates optimal conditions for selective crystallization of sucralose-6-acetate from chlorinated by-products. The specific volume ratio range of (0.5-1):1 to (1.5-2) ensures that the target product crystallizes in high purity form in a single step, achieving both high product quality and high crystallization efficiency without requiring multiple repeated operations.
4Ease of operation
If ethyl acetate is used alone for crystallization, then simple operation is maintained, but large organic solvent consumption occurs
Solution Approach 1:
The patent modifies the solvent composition parameter by introducing a low-polarity solvent component with a controlled volume ratio of (0.5-1):1 to (1.5-2) relative to ethyl acetate. This parameter change enhances the separation efficiency and reduces the total volume of solvent required for effective crystallization, while the operation remains straightforward and does not require complex procedural changes.
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 enhances the single-pass crystallization yield and purity of sucralose-6-acetate, reduces the number of crystallization times, and decreases organic solvent consumption, resulting in high-quality products with improved efficiency and reduced costs.
Implementation Method 1
subjecting the saturated solution to multiple cooling crystallization and filtration
Implementation Method 2
a low-polarity solvent is added dropwise to the saturated solution to reduce a polarity of the saturated solution during crystallization step by step
Data Source
AI summary
Provided is a method for purifying sucralose-6-acetate, including: preparation: providing a saturated solution of crude sucralose-6-acetate in ethyl acetate that is heated to a predetermined temperature; gradient crystallization: subjecting the saturated solution to multiple cooling crystallization and filtration, and collecting crude sucralose-6-acetate obtained after the multiple cooling crystallization and filtration, where during each cooling crystallization process, a low-polarity solvent is added dropwise to the saturated solution to reduce a polarity of the saturated solution during crystallization step by step; and purification: subjecting a collected crude sucralose-6-acetate to recrystallization for purification by using a mixed solution of ethyl acetate and the low-polarity solvent to obtain fine sucralose-6-acetate of high purity.