Selective Esterification for Isoidide Isolation from Dianhydrohexitol Mixtures
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Solution Overview
Problem
Current methods for producing isoidide are inefficient and lack a convenient method for isolation, particularly in terms of yield and energy consumption, as isoidide is not readily available in technical quantities due to the scarcity of iditol as a starting material.
Innovation Solution
A method involving a mixture of isoidide and isosorbide or isomannide undergoing selective esterification, allowing for the isolation of non-esterified isoidide and esterified dianhydrohexitol isomers under mild conditions, utilizing a lead catalyst and carboxylic acid anhydrides, followed by liquid-liquid extraction for purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce isoidide from iditol, then isoidide can be obtained, but the yield is low and energy consumption is high due to the scarcity of iditol as starting material
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using selective esterification with carboxylic acid anhydrides under mild conditions (room temperature or slightly elevated temperatures) to convert isoidide into separable ester derivatives, thereby improving production yield and reducing energy consumption compared to conventional high-energy dehydration methods
Solution Approach 2:
The invention introduces esterification reagents (carboxylic acid anhydrides) as intermediaries to facilitate the separation and purification of isoidide from reaction mixtures. These reagents enable selective derivatization of isoidide, making it easier to isolate and purify without requiring energy-intensive distillation or chromatography steps
2Manufacturing precision
If selective esterification is performed to isolate isoidide, then isolation efficiency and purity are improved, but additional reagents and process steps are required
Solution Approach 1:
The invention applies local quality by performing selective esterification at specific hydroxyl groups of isoidide using carboxylic acid anhydrides. The reaction conditions are optimized to achieve selective modification of isoidide without affecting other dianhydrohexitol isomers, thereby improving isolation purity while maintaining relatively simple process conditions
Solution Approach 2:
The invention employs preliminary action by conducting selective esterification as a preparatory step before final isolation and purification of isoidide. The ester derivatives formed in this preliminary step are easier to separate and purify, simplifying the overall process despite the additional reagent step
3Quantity of substance
If epimerization methods are used to prepare isoidide from isosorbide or isomannide, then isoidide can be produced in larger amounts, but the process requires additional steps and lower overall efficiency
Solution Approach 1:
The invention applies the taking out principle by selectively extracting isoidide from mixtures of dianhydrohexitol isomers through selective esterification. The carboxylic acid anhydrides react preferentially with isoidide, allowing its extraction and isolation from the mixture in high purity and quantity without requiring multiple epimerization steps
Solution Approach 2:
The invention uses partial action by performing selective esterification under controlled conditions where only isoidide is modified among the dianhydrohexitol isomers present. By carefully controlling reaction parameters (temperature, reagent ratio, catalyst), the process achieves high selectivity for isoidide, improving both quantity and efficiency without excessive reaction steps
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 method significantly enhances the yield and efficiency of isoidide isolation, allowing for high purity isoidide production with reduced energy consumption and operational costs, facilitating its use in polymer synthesis.
Implementation Method 1
utilizing a lead catalyst and carboxylic acid anhydrides
Implementation Method 2
subjecting the mixture of compounds of formula II from step M3) to conditions of a selective esterification
Implementation Method 3
followed by liquid-liquid extraction for purification
Data Source
AI summary
Disclosed herein is a method of making and/or isolating isoidide, a composition including a mixture including non-esterified isoidide and one or both compounds selected from the group consisting of esterified isosorbide and esterified isomannide and a method of using of such composition for making and/or isolating isoidide. Further disclosed herein is a method including a step of selective esterification of a mixture of dianhydrohexitol isomers including isoidide for separating isoidide from said mixture of dianhydrohexitol isomers. Moreover, a method of making a polymer including isoidide monomers or modified isoidide monomers is disclosed.