Glycol Purification via Hydrazone Formation and Distillation
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Solution Overview
Problem
In the manufacturing of semiconductor and display components, glycol-based solvents pose a challenge as formaldehyde, a harmful substance, is continuously generated and cannot be removed through general distillation, necessitating a method to achieve high purity glycol compounds with zero formaldehyde content.
Innovation Solution
A method involving the agitation of a mixture of a first glycol-based compound, a hydrazide-based compound, and a sulfonic acid-based compound, followed by fractional distillation, to recover a second glycol-based compound with a formaldehyde content of 0 ppm, while maintaining specific temperature and pH conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If general distillation is used to remove formaldehyde from glycol-based compounds, then the purification process is simple, but formaldehyde cannot be completely removed due to continuous generation from the glycol solvent
Solution Approach 1:
The patent introduces a hydrazide-based compound as an intermediary substance that reacts with formaldehyde to form a hydrazone derivative. This mediator enables the removal of formaldehyde from glycol-based compounds where direct distillation fails, as the hydrazone formation converts volatile formaldehyde into a non-volatile product that can be separated through filtration and distillation of the glycol solvent
Solution Approach 2:
The patent changes the chemical state of formaldehyde by reacting it with the hydrazide-based compound under controlled conditions (pH 2-7, temperature 0-100°C). This parameter change transforms formaldehyde from a volatile substance that cannot be removed by distillation into a non-volatile hydrazone derivative, enabling complete formaldehyde removal while maintaining process simplicity
2Manufacturing precision
If the agitation time is extended to ensure complete formaldehyde removal, then the purification efficiency improves, but the manufacturing time increases
Solution Approach 1:
The patent performs preliminary action by pre-mixing the hydrazide-based compound with the glycol-based compound before formaldehyde generation becomes significant. This preliminary combination ensures that when formaldehyde is present, the hydrazide is already positioned to react with it, reducing the required agitation time while achieving complete formaldehyde removal
Solution Approach 2:
The patent maintains continuous useful action by keeping the hydrazide-based compound in contact with the glycol-based compound throughout the process. This continuous presence ensures that formaldehyde is removed as it generates, rather than requiring extended agitation to catch up, thereby reducing total processing time while achieving complete purification
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 effectively removes formaldehyde, ensuring the production of high purity glycol-based compounds with 0 ppm formaldehyde content, meeting stringent regulatory requirements.
Implementation Method 1
a hydrazide-based compound and a sulfonic acid-based compound are added to a first glycol-based compound, and the mixture is agitated
Implementation Method 2
fractional distillation of resultant materials of the agitating is performed to recover a second glycol-based compound
Implementation Method 3
performing fractional distillation of resultant materials of the agitating
Data Source
AI summary
Provided is a method for manufacturing a glycol based compound. The method comprises agitating a mixture of a first glycol based compound, a hydrazide based compound, and a sulfonic acid based compound, and performing fractional distillation of resultant materials of the agitating to recover a second glycol based compound having a formaldehyde content of 0 ppm.