Dimethyl Trisulfide Stability via Polar Solvent Mediation
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Solution Overview
Problem
Dimethyl trisulfide (DMTS) solutions, especially when combined with MDEA, are not stable in water and degrade rapidly, making it challenging to store effectively for extended periods.
Innovation Solution
Formulating DMTS with a polar organic solvent and maintaining a pH of 9 or less, or using containers that are substantially free of materials that cause degradation, such as non-fluorinated HDPE, to create a stable single-phase concentrate composition that degrades less than 40% over one year.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DMTS is stored in water solution, then it is easy to dissolve and apply, but it degrades rapidly over time
Solution Approach 1:
The patent introduces a polar organic solvent as an intermediary substance between water and DMTS. This solvent acts as a mediator that allows DMTS to be dissolved in aqueous-based formulations while preventing direct contact between DMTS and water, thereby maintaining ease of application through water-based delivery systems while achieving storage stability by blocking the degradation pathway.
2Adaptability or versatility
If DMTS is combined with MDEA to enhance insect attraction, then the attractive properties are improved, but the solution becomes unstable and degrades faster
Solution Approach 1:
The polar organic solvent serves as a protective intermediary that separates the MDEA-DMTS complex from direct aqueous exposure. This allows the synergistic combination of MDEA and DMTS to maintain enhanced insect attraction properties while the solvent barrier prevents the unstable interaction between MDEA and water that would otherwise cause rapid degradation.
Solution Approach 2:
The patent changes the chemical environment parameters by introducing a polar organic solvent with specific properties (pH range, polarity, hydrogen bonding capability). This parameter change creates a stable medium that accommodates the MDEA-DMTS combination, maintaining the enhanced attraction effectiveness while preventing the chemical instability that occurs in pure water solutions.
3Ease of operation
If DMTS is stored in containers made of certain materials, then it is easy to store, but materials cause degradation of DMTS
Solution Approach 1:
The polar organic solvent acts as a protective intermediary layer between the DMTS solution and the container material. This solvent barrier prevents direct interaction between DMTS and potentially degrading container surfaces, allowing use of convenient storage containers while eliminating the harmful effect of container-induced degradation.
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 compositions and storage methods provide shelf-stable solutions for DMTS, maintaining stability equivalent to one year at room temperature when stored at 54° C for two weeks, with less than 40% degradation, allowing for effective use as an insect attractant or pesticide.
Implementation Method 1
Formulating DMTS with a polar organic solvent... The DMTS does not degrade more than 40% within one year of storage
Implementation Method 2
maintaining a pH of 9 or less... When the pH is 9 or less, the composition does not degrade more than 40% within one year of storage
Data Source
AI summary
The present disclosure provides methods and compositions for inhibiting degradation of dimethyl trisulfide (DMTS) in solution. Concentrate compositions include DMTS and polar inorganic or organic solvent. The compositions can be stored in containers for at least 2 weeks at 54° C. or at least one year at room temperature and less than 50% of the DMTS degrades. The concentrate compositions can be diluted for use and combined with other components to form various solutions.