Esterquat Fabric Softener Process With Low-Residue Transesterification
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Solution Overview
Problem
Existing methods for preparing fabric softeners using transesterification reactions result in high unconverted glyceride and glycerin content, leading to poor color and stability issues, often requiring decolorants that can cause skin irritation.
Innovation Solution
A two-step transesterification process at low temperatures under high vacuum conditions to minimize glycerin and glyceride residues, followed by quaternization with a quaternizing agent in a solvent, reducing the content of these residues to 5 wt.% or less without additional processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transesterification reaction is performed using conventional methods, then fabric softener is produced, but high unconverted glyceride and glycerin content results in poor color and stability
Solution Approach 1:
The patent applies parameter changes by conducting the transesterification reaction at low temperature (40-60°C) under high vacuum conditions (1-10 mmHg), deviating from conventional high-temperature atmospheric reactions. This parameter modification enables complete conversion of triglycerides while removing glycerin, achieving both high reliability and low unconverted content without requiring decolorants
Solution Approach 2:
The patent uses high vacuum conditions (1-10 mmHg) to create an inert environment that prevents oxidation and facilitates glycerin removal. The vacuum atmosphere enables the reaction to proceed without oxygen interference and allows glycerin to be removed from the reaction system, improving both stability and reducing unconverted residues
2Ease of manufacture
If conventional transesterification methods are used, then reaction proceeds, but high glycerin content requires additional decolorant processing that causes skin irritation
Solution Approach 1:
The patent converts the harmful effect of glycerin accumulation into a benefit by using the vacuum condition to actively remove glycerin from the reaction system. The glycerin that would normally remain as a harmful residue is instead continuously removed during the reaction, eliminating the need for decolorants and associated skin irritation risks
Solution Approach 2:
The patent performs preliminary glycerin removal during the transesterification reaction itself by maintaining high vacuum conditions. This preliminary action prevents glycerin accumulation before it becomes a problem, eliminating the need for subsequent decolorant treatment 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
The method produces fabric softeners with improved long-term stability and color, eliminating the need for decolorants that cause skin issues, while enhancing fabric softness and reducing unconverted glyceride and glycerin content.
Implementation Method 1
the transesterification reaction of a fatty acid containing oil and the quaternization thereof
Implementation Method 2
quaternizing ester compounds induced from fatty acids and tertiary amines
Data Source
AI summary
The present invention relates to a method of preparing a fabric softener and to a fabric softener prepared thereby, and more particularly, to a method of preparing a fabric softener containing an esterquat by performing a two-step transesterification reaction on oil and tertiary hydroxyalkyl amine at a low temperature in a high vacuum state under specific conditions, and then quaternizing the resultant product. The method of preparing a fabric softener containing an esterquat according to the present invention can reduce the content of unconverted glyceride, glyceryl ester, or a mixture thereof, and can provide a fabric softener with excellent long-term stability.