Fluoride-Free SSZ-85 Synthesis Using Ionic Liquid Mediator
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Solution Overview
Problem
The synthesis of cobalt aluminophosphate molecular sieve SSZ-85 typically requires fluoride ions, which poses safety and cost concerns in commercial operations.
Innovation Solution
A method for preparing SSZ-85 by contacting a reaction mixture comprising cobalt, aluminum, phosphorus, and an ionic liquid with a 1,3-diisopropylimidazolium cation under crystallization conditions, without the presence of fluoride ions, using ionothermal synthesis where the ionic liquid acts as both solvent and structure directing agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoride ions are used in the synthesis of molecular sieve SSZ-85, then the molecular sieve can be successfully synthesized with desired structure, but safety and cost concerns arise in commercial operations
Solution Approach 1:
The patent removes fluoride ions from the synthesis system entirely, replacing them with an ionic liquid comprising a 1,3-diisopropylimidazolium cation. This extraction of the harmful substance (fluoride ions) eliminates safety and cost concerns while maintaining the ability to synthesize SSZ-85 molecular sieve with the desired structure and properties.
Solution Approach 2:
The ionic liquid serves as an intermediary substance that performs the structure-directing function previously accomplished by fluoride ions. The 1,3-diisopropylimidazolium cation acts as a mediator in the synthesis process, enabling the formation of the SSZ-85 structure without requiring harmful fluoride ions, thus resolving the contradiction between synthesis reliability and safety.
2Manufacturing precision
If fluoride ions are used in the synthesis of molecular sieve SSZ-85, then the molecular sieve structure can be formed, but extra cost considerations are incurred
Solution Approach 1:
By extracting fluoride ions from the synthesis mixture, the patent eliminates the need to purchase, handle, and dispose of this costly reagent. The ionic liquid replacement maintains structure formation capability while reducing manufacturing costs associated with fluoride ion procurement and safety compliance.
Solution Approach 2:
The ionic liquid serves as a cost-effective alternative to fluoride ions. While the ionic liquid is consumed in the reaction, it provides a cheaper and safer route to achieving the desired molecular sieve structure, improving ease of manufacture by eliminating expensive safety and disposal requirements associated with fluoride ions.
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 allows for the successful synthesis of SSZ-85 substantially free of fluoride ions, reducing safety and cost concerns while maintaining the material's unique sieving and catalytic properties.
Implementation Method 1
contacting under crystallization conditions a reaction mixture comprising a source of cobalt; a source of aluminum; a source of phosphorus; and an ionic liquid comprising a 1,3-diisopropylimidazolium cation
Implementation Method 2
using ionothermal synthesis where the ionic liquid acts as both solvent and structure directing agent
Data Source
AI summary
A method is disclosed for preparing molecular sieve SSZ-85 in the absence of a source of fluoride ions.