N-Alkylpyroglutamic Acid Surfactant Process for Low Irritation
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Solution Overview
Problem
The surfactant industry faces challenges in providing environmentally friendly, non-toxic, and cost-effective surfactants for personal care applications, particularly due to the skin irritancy and waste generation associated with alcohol ethoxy sulfates and the high costs of amide-based amino acid surfactants.
Innovation Solution
The development of N-alkylpyroglutamic acid compounds and their derivatives, which are derived from glutamic acid and aldehydes, offering a range of compositions and methods for production that can be used as surfactants with enhanced performance and reduced irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alcohol ethoxy sulfates (AES) are used as surfactants, then surfactant performance is achieved, but skin irritancy and environmental unfriendliness occur
Solution Approach 1:
The patent changes the chemical structure parameters by replacing the sulfate group with a carboxylate group, transforming AES into amino acid-based surfactants. This parameter change maintains surfactant performance while eliminating skin irritancy, as amino acids are naturally biocompatible and non-irritating to skin
Solution Approach 2:
The patent employs readily biodegradable amino acid-based surfactants that break down quickly in the environment, replacing persistent conventional surfactants. These surfactants are designed to be environmentally friendly with short environmental lifecycles, eliminating accumulation and pollution issues
2Reliability
If amide-based amino acid surfactants are prepared using fatty acid chlorides, then surfactant performance is achieved, but production cost increases due to corrosive reagents and waste generation
Solution Approach 1:
The patent converts the harmful chlorinating reagent step into a beneficial direct amidation process. By using activated esters or acid chlorides generated in-situ from fatty acids, the method eliminates the need for separate chlorination steps, reducing corrosive waste while maintaining amide bond formation efficiency
Solution Approach 2:
The patent eliminates the generation of full equivalent waste from chlorinating reagents by using alternative pathways that produce benign byproducts. The process recovers and utilizes fatty acid intermediates directly, avoiding the need to discard harmful chloride waste streams
3Reliability
If amide-based amino acid surfactants are prepared using fatty acid chlorides, then surfactant performance is achieved, but production cost increases due to isolation requirements
Solution Approach 1:
The patent merges the amide formation step with the purification step by designing a process where the reaction conditions inherently favor product isolation. The amidation reaction is conducted in conditions that allow direct precipitation or phase separation of the amino acid surfactant, eliminating separate isolation operations
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
These compounds provide effective surfactant performance with reduced skin irritation and lower production costs, aligning with the demand for environmentally friendly and sustainable surfactants in personal care formulations.
Implementation Method 1
N-alkylpyroglutamic acid compounds and their derivatives, which are derived from glutamic acid and aldehydes
Implementation Method 2
The compounds provide effective surfactant performance... N-alkylpyroglutamic acids, which may be derived from glutamic acid and aldehydes
Data Source
AI summary
Disclosed are compounds of formulae:and salts, hydrates, or solvates thereof, where R1, R2, R3, R5, and R6 are defined herein, compositions containing these compounds, methods of preparing these compounds, and methods of using these compounds in a variety of applications, such as a surfactant or additive in personal care products.