Aromatic Ester Solvents for Metallosilicate Catalyst Fouling
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Solution Overview
Problem
Metallosilicate catalysts used in the production of secondary alcohol ethoxylate surfactants foul quickly, leading to short in-service times and low monoalkyl ether production rates, despite offering high selectivity for monoalkyl ether, which is advantageous over dialkyl ether.
Innovation Solution
The use of solvents comprising aryl groups and ester groups, known as aromatic ester solvents, which increase monoalkyl ether selectivity to greater than 85% and sustain production rates, unlike conventional solvents that do not significantly impact the reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metallosilicate catalysts are used for monoalkyl ether formation, then selectivity for monoalkyl ether is improved (greater than 80%), but catalyst in-service time deteriorates (short in-service times due to quick fouling)
Solution Approach 1:
The patent introduces a solvent as an intermediary substance that mediates between the catalyst and reactants. The solvent protects the catalyst from fouling while maintaining high monoalkyl ether selectivity, effectively extending catalyst in-service time without sacrificing manufacturing precision
Solution Approach 2:
The patent changes the reaction medium parameter by introducing a specifically selected solvent. This parameter change modifies the reaction environment to prevent catalyst fouling while maintaining the high selectivity characteristics of metallosilicate catalysts for monoalkyl ether formation
2Manufacturing precision
If metallosilicate catalysts are used for monoalkyl ether formation, then selectivity for monoalkyl ether is improved (greater than 80%), but production rate deteriorates (low production rates)
Solution Approach 1:
The solvent acts as a mediator that enhances the interaction between catalyst and reactants, increasing the frequency of effective collisions and thereby improving production rate while maintaining the high selectivity inherent to metallosilicate catalysts
3Ease of operation
If conventional solvents are used in olefin and alcohol reactions, then reaction can be conducted, but monoalkyl ether selectivity deteriorates (selectivity does not increase significantly)
Solution Approach 1:
The patent specifically changes the solvent parameter from conventional options to aromatic esters with particular structural characteristics. This parameter change transforms the reaction medium to provide both ease of operation and significantly improved monoalkyl ether selectivity greater than 85%
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
Aromatic ester solvents enhance monoalkyl ether selectivity and production rates, extending catalyst life and maintaining high yields, thereby improving the efficiency and longevity of the catalytic process.
Implementation Method 1
The monoalkyl ether is formed from an olefin and a (poly)alkylene glycol using metallosilicate catalysts
Implementation Method 2
solvents comprising aryl groups and ester groups ('aromatic ester solvents') provide both an increase in monoalkyl ether selectivity as well as increased monoalkyl ether production rates
Data Source
AI summary
A method including the step contacting an olefin, an alcohol, a metallosilicate catalyst and a solvent, wherein the solvent comprises structure (I): wherein R1 and R2 are each selected from the group consisting of an aryl group and an alkyl group with the proviso that at least one of R1 and R2 is an aryl group, further wherein n is 1-3.