2-Hydroxymethylmorpholine Salt Crystallization Process
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Solution Overview
Problem
The existing production method for 2-hydroxymethylmorpholine is complex, costly, and inefficient due to the need for low temperature facilities and large amounts of solvents, making it impractical for industrial scale, and the resulting product is a tacky, difficult-to-handle substance.
Innovation Solution
A method involving crystallization of a 2-hydroxymethylmorpholine salt with impurities using inorganic or organic acids, such as hydrochloric acid or trifluoroacetic acid, to produce a high-purity, easily handleable solid form of the compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the conventional production method using succinic anhydride and low temperature reaction is employed, then 2-hydroxymethylmorpholine can be produced, but the process becomes extremely long, complicated and requires special low temperature facilities
Solution Approach 1:
The invention changes the reaction parameters by using a different chemical pathway that does not require low temperature (-25°C) conditions. Instead of the conventional succinic anhydride method, the invention employs a multi-step synthesis involving N-protected ethanolamine, epichlorohydrin, and selective deprotection that proceeds at standard industrial temperatures, thereby eliminating the need for special low temperature facilities while maintaining product purity
Solution Approach 2:
The synthesis is segmented into distinct modular steps: (1) protection of ethanolamine, (2) ring closure with epichlorohydrin, (3) selective deprotection to remove the protecting group, and (4) crystallization. This segmentation allows each step to be optimized independently and facilitates industrial scaling without requiring complex integrated low temperature equipment
2Manufacturing precision
If large amounts of aqueous ammonia and organic solvents are used to remove impurity, then impurity removal is achieved, but the method becomes costly and low in efficiency
Solution Approach 1:
The invention extracts and removes the 1,4-oxazepane compound impurity through selective chemical reactions and filtration steps. The N-protecting group strategy enables selective transformation of the desired product while leaving impurities unchanged, allowing their removal through standard filtration and crystallization without requiring large volumes of aqueous ammonia and organic solvents
Solution Approach 2:
The invention changes the purification parameters by using selective deprotection chemistry followed by crystallization rather than solvent extraction. This approach reduces solvent consumption significantly while achieving high purity product, as the purification relies on differential solubility and chemical selectivity rather than partitioning between large volumes of solvents
3Productivity
If the conventional method is used, then 2-hydroxymethylmorpholine is produced, but it is obtained as a tacky gummy substance which is difficult to handle and distribute
Solution Approach 1:
The invention utilizes phase transition by crystallizing the final product from solution. The 2-hydroxymethylmorpholine is obtained as well-defined crystals through controlled crystallization from aqueous or organic solvents, transforming it from a tacky gummy substance to a free-flowing solid that is easy to handle, store, and distribute
Solution Approach 2:
The invention produces a composite crystalline structure where 2-hydroxymethylmorpholine forms a stable solid lattice. This crystalline composite form eliminates the tacky properties of the pure liquid or amorphous substance, providing a stable, free-flowing solid that maintains chemical purity while dramatically improving physical handleability for industrial applications
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 simplifies the process, eliminates the need for low temperature facilities, and results in a stable, high-purity 2-hydroxymethylmorpholine salt that is easier to handle and distribute as an industrial product.
Implementation Method 1
crystallizing the salt from a solution containing 2-hydroxymethylmorpholine represented by the following formula (1)
Data Source
AI summary
The present invention relates to a production method of a 2-hydroxymethylmorpholine salt, which includes crystallization from a solution containing 2-hydroxymethylmorpholine represented by the following formula (1) 1,4-oxazepane compound represented by the following formula (2) and an acid. According to the present invention, a production method capable of producing a highly pure 2-hydroxymethylmorpholine salt conveniently and efficiently at an industrial scale can be provided.