Organic Amine Isolation via Ammonia-Induced Phase Separation
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Solution Overview
Problem
Existing processes for isolating organic amines from compositions with acids or their salts result in significant material loss, byproduct formation, and difficulty in removing impurities, leading to polyamides with inferior properties or incomplete polymerization.
Innovation Solution
A process involving the addition of ammonia or hydrazine to form a multi-phase system, allowing for the separation and isolation of the organic amine-rich phase, which is lean in acid content, and the acid-rich phase, facilitating easy separation and recovery of by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alkali is added to raise pH to 12-14 for amine extraction, then the organic amine can be extracted with polar solvents, but aqueous byproducts comprising dissolved alkali acid salts are formed causing significant material loss
Solution Approach 1:
The invention changes the pH adjustment method from adding alkali to adding organic acid. This parameter change transforms the byproduct from water-soluble alkali acid salts to organic-soluble ammonium/organic acid salts, which can be extracted into the organic phase, thereby reducing material loss in aqueous waste streams
Solution Approach 2:
The invention introduces an organic acid as an intermediary substance that mediates between the amine and the pH adjustment requirement. The organic acid reacts with the amine to form ammonium/organic acid salt complexes that are soluble in organic solvents, enabling phase separation without creating water-soluble byproducts
2Loss of substance
If organic solvent is added without alkali to isolate amine as salt, then material loss is reduced, but amine impurities easily incorporate into the cadaverine acid salt making purification difficult
Solution Approach 1:
The invention applies local quality by using a polar solvent with specific properties (high dielectric constant, hydrogen bonding capability) that creates a selective environment. This local solvent environment preferentially dissolves the desired amine while leaving impurities in the aqueous phase, achieving both recovery and purification simultaneously
3Manufacturing precision
If multiple steps are used for amine isolation (alkali addition, extraction, byproduct separation), then separation can be achieved, but process complexity increases and productivity decreases
Solution Approach 1:
The invention merges multiple separation steps into a single operation. By adding organic acid directly to the reaction mixture and then extracting with organic solvent, the pH adjustment, amine complexation, and phase separation occur in an integrated process, eliminating intermediate steps and improving productivity
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 process achieves efficient separation of organic amines in a single step, reduces material loss, and allows for the easy removal of amine impurities and recovery of surplus ammonia or hydrazine, enhancing the quality of polyamide production.
Implementation Method 1
the addition of ammonia or hydrazine in a sufficient amount to a composition comprising the organic amine and the acid, or a salt of the organic amine and the acid, results in formation of a multi-phase system comprising an organic amine-rich phase and an acid-rich phase
Data Source
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AI summary
The invention relates to a process for the isolation of an organic amine from a composition comprising the organic amine and an acid, or a salt of the organic amine and the acid, wherein the process comprises steps wherein ammonia or hydrazine is added to the composition thereby forming a multi-phase system comprising an organic amine -rich phase and an acid-rich phase, the organic amine-rich phase and the acid-rich phase obtained in step (i) are separated, and the organic amine is isolated from the organic amine -rich phase.