Monoalkyl Ether Catalysis With Metal Oxides for Higher Selectivity
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Solution Overview
Problem
Existing methods for producing (poly)alkylene glycol monoalkyl ethers using crystalline metallosilicate sieve catalysts suffer from low mono-ether selectivity and high di-ether selectivity, leading to undesirable surfactant properties and high production costs due to limited availability and cost of starting materials, particularly for secondary alcohol ethoxylates.
Innovation Solution
A process involving an admixture of a crystalline metallosilicate molecular sieve catalyst, such as BEA-Type zeolite, with an oxide of a Group 3 metal or Lanthanide element, such as Yttrium, Lanthanum, Neodymium, Gadolinium, or Holmium oxide, enhances selectivity and stability, allowing high olefin conversion to (poly)alkylene glycol monoalkyl ethers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If olefin conversion is increased using crystalline metallosilicate molecular sieve catalyst, then productivity improves, but mono-ether selectivity decreases and di-ether selectivity increases
Solution Approach 1:
The patent combines crystalline metallosilicate molecular sieve catalyst with metal oxides (such as Ga2O3, ZnO, or Al2O3) to create a composite catalytic system. This composite approach allows the system to achieve high olefin conversion (greater than 10%) while maintaining high mono-ether selectivity (greater than 90%), resolving the contradiction between productivity and manufacturing precision by synergistically combining the high activity of metal oxides with the high selectivity of the molecular sieve structure.
2Device complexity
If conventional crystalline metallosilicate molecular sieve catalyst is used, then process simplicity is maintained, but catalyst stability and longevity are insufficient
Solution Approach 1:
The patent creates a composite catalyst system where metal oxides are combined with crystalline metallosilicate molecular sieves. The metal oxide components enhance the catalyst's stability and longevity, allowing the catalyst to maintain its activity and selectivity over extended periods. This composite approach improves reliability while keeping the overall process relatively simple, as the components are combined in a straightforward manner.
3Productivity
If high olefin conversion is achieved with conventional catalysts, then productivity increases, but production costs increase due to limited availability and high cost of starting materials
Solution Approach 1:
The patent employs a composite catalytic system that achieves high olefin conversion (greater than 10%) with improved cost-effectiveness. The combination of metal oxides and crystalline metallosilicate molecular sieves creates a highly efficient catalyst that maximizes mono-ether production from available starting materials, reducing waste and improving overall process economics.
Solution Approach 2:
The patent optimizes reaction parameters including temperature (100-200°C), pressure, and catalyst composition to achieve high conversion efficiency. By carefully controlling these parameters, the process maximizes productivity while maintaining cost-effectiveness through improved selectivity and reduced byproduct formation.
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 admixture significantly increases catalyst stability and selectivity, resulting in high yield and reduced production of detrimental byproducts, thereby lowering production costs and improving the quality of secondary alcohol ethoxylates.
Implementation Method 1
providing an admixture of a crystalline metallosilicate molecular sieve catalyst and an oxide of a metal... reacting in a liquid phase process an olefin and a (poly)alkylene glycol in the presence of the admixture of the crystalline metallosilicate molecular sieve catalyst and the oxide of the metal to yield the (poly)alkylene glycol monoalkyl ether
Data Source
AI summary
Embodiments are directed towards a process for producing a (poly)alkylene glycol monoalkyl ether. The process includes providing an admixture of a crystalline metallosilicate molecular sieve catalyst and an oxide of a metal and reacting in a liquid phase process an olefin and a (poly)alkylene glycol in the presence of the admixture to yield the (poly)alkylene glycol monoalkyl ether. Reacting the olefin and the (poly)alkylene glycol in the presence of the admixture is at a temperature of 80° C. to 200° C.