Cyclic Ketone Peroxide Composition Crystallization Control
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Solution Overview
Problem
Compositions of cyclic ketone peroxides pose safety hazards due to explosive crystal formation during storage at low temperatures, and existing solutions either dilute the compositions too much, reducing their efficiency or introduce contaminants.
Innovation Solution
A composition containing trimeric cyclic methyl ethyl ketone peroxide and specific peroxides with a controlled molar ratio, along with a diluent and optional additives, which has a crystallization point below -5°C, enhancing safety and storage stability without using co-crystallizing compounds or dialkyl peroxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic ketone peroxide compositions are stored at low temperatures (0°C or below), then storage stability should be improved, but explosive crystal formation occurs causing safety hazards
Solution Approach 1:
The patent modifies the physical-chemical parameters of the peroxide composition by adding specific diluents (paraffinic hydrocarbons with 10-20 carbon atoms) and co-solvents (aromatic hydrocarbons, esters, or ethers) to change the crystallization behavior. This parameter change lowers the crystallization temperature and prevents explosive crystal formation while maintaining storage stability.
Solution Approach 2:
The patent introduces intermediary substances (diluents and co-solvents) that mediate between the peroxide molecules to prevent direct crystallization. These intermediaries interfere with the crystallization process by forming solvates or modifying the solvent structure, thereby preventing explosive crystal formation while maintaining peroxide stability.
2Object-affected harmful factors
If the composition is strongly diluted to resolve safety issues, then safety hazards are reduced, but active oxygen content becomes too low reducing efficiency and contaminating polymers
Solution Approach 1:
The patent optimizes the concentration parameters by formulating compositions with 5-50 wt% peroxide content in specific diluent systems. This parameter optimization maintains high active oxygen content while preventing crystal formation, thereby preserving polymerization efficiency without excessive dilution.
Solution Approach 2:
The patent creates composite peroxide compositions combining cyclic ketone peroxides with specific diluents and co-solvents in optimized ratios. This composite formulation maintains high peroxide concentration for efficiency while the composite structure prevents crystallization through solvate formation, resolving the safety-efficiency contradiction.
3Reliability
If co-crystallizing compounds (e.g., paraffin wax) are added to prevent crystallization, then storage stability is improved, but the compound blocks reactor conduits under high pressure and contaminates end-products
Solution Approach 1:
The patent uses readily available hydrocarbon diluents and common co-solvents that form transient solvates rather than permanent solid additives. These short-living solvate structures prevent crystallization during storage but decompose or remain soluble during processing, avoiding reactor blockage and product contamination unlike persistent co-crystallizing compounds.
Solution Approach 2:
The patent changes the physical parameters of the system by selecting diluents and co-solvents with specific boiling points, molecular weights, and solvation capabilities. These parameter selections ensure that the prevention mechanism operates only at storage temperatures and does not interfere with high-temperature polymerization processes, avoiding reactor blockage and contamination.
4Object-affected harmful factors
If dialkyl peroxides are added to mitigate crystallization risks, then safety is improved, but static charge susceptibility and health risks increase making handling difficult
Solution Approach 1:
The patent uses hydrocarbon diluents and co-solvents as intermediary substances that prevent crystallization through solvate formation rather than using dialkyl peroxides. These intermediaries do not generate static charges or pose health risks, maintaining ease of operation while still mitigating crystallization risks.
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 composition maintains high active oxygen content and efficiency while preventing crystallization and explosive risks, ensuring chemical stability and effective polymerization processes without contaminating the end-products.
Implementation Method 1
the formation of explosive crystals... These crystals can explode spontaneously during storage... the crystallization point is below -5° C.
Data Source
AI summary
A composition comprising at least two trimeric cyclic ketone peroxides: a trimeric cyclic methyl ethyl ketone peroxide (3MEK-cp) of formula (I) and at least one peroxide satisfying formula (II) wherein R1 through R3 are independently selected from alkyl and alkoxyalkyl groups, said groups having 2 to 5 carbon atoms, the total number of carbon plus oxygen atoms of R1−R2+R3 is in the range 7-15, and the molar ratio of 3MEK-cp to the total amount of peroxides satisfying formula (II) being in the range of from 10:90 to 80:20.