Molecular Sieve Blends with Hydrophobic Binder
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Solution Overview
Problem
Conventional zeolite agglomerate blends face issues with diffusion rate limitations, production of undesired oligomers and polymers, and reduced adsorption life due to the use of clay binders, which affect their performance in dehydration and separation processes, especially in hydrocarbon feed streams.
Innovation Solution
The development of molecular sieve blends comprising a low silica, hydrophilic zeolite blended with a hydrophobic silicon-based binder, utilizing a granulation seed process with a clay binding agent, which reduces the quantity of binder needed while enhancing diffusion rates and selectivity, and minimizing the production of green oil and coke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If clay binders are used to agglomerate zeolite crystals, then the pressure drop through the bed is reduced, but the diffusion rate is limited and the production of undesired oligomers and polymers increases
Solution Approach 1:
The patent changes the chemical composition parameters of the binder material, transitioning from conventional clay binders to a specific composition containing amorphous silica (70-90 wt%), alumina (5-20 wt%), and magnesia (0.1-5 wt%). This parameter change in binder composition resolves the contradiction by achieving both reduced pressure drop and improved diffusion rate simultaneously, while also minimizing oligomer and polymer formation.
2Strength
If clay binders are used to agglomerate zeolite crystals, then the mechanical strength of the agglomerate is improved, but the adsorption life is reduced due to green oil and coke production
Solution Approach 1:
The patent modifies the binder composition parameters to include specific ranges of amorphous silica, alumina, and magnesia, which change the chemical properties of the binder system. This parameter change eliminates the harmful catalytic activity associated with conventional clay binders, thereby extending adsorption life by preventing green oil and coke formation while maintaining mechanical strength.
Solution Approach 2:
The patent converts the potential harm of binder materials (which can catalyze unwanted reactions) into a benefit by selecting a binder composition that is inert towards hydrocarbon feed streams. The amorphous silica-based binder system does not promote oligomerization or coking, thus transforming the binder from a potential harm source into a beneficial neutral supporting matrix that extends adsorbent life.
3Ease of manufacture
If conventional binder materials are used, then the manufacturing process is simple, but the quantity of binder needed is high and performance is reduced
Solution Approach 1:
The patent changes the performance parameters of the binder material by using amorphous silica-based composition with specific ratios of silica, alumina, and magnesia. This parameter change enables the binder to achieve superior performance with lower quantities (5-30 wt% of the adsorbent blend), eliminating the need for high binder loadings required by conventional materials while maintaining ease of manufacture.
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 molecular sieve blends exhibit improved adsorption rates, selectivity, and extended life expectancy by reducing the production of oligomers and polymers, and require lower regeneration temperatures, leading to increased productivity and cost savings.
Implementation Method 1
Heating these zeolites to high temperatures results in the loss of the water of hydration, leaving a crystalline structure with channels of molecular dimensions, offering a high surface area for the adsorption of inorganic or organic molecules. Adsorption of these molecules is dependent upon the size of the zeolite channels. The rate of adsorption is limited by the laws of diffusion.
Implementation Method 2
The rate of adsorption is limited by the laws of diffusion.
Implementation Method 3
Molecular sieve blends comprising a low silica, hydrophilic zeolite blended with a hydrophobic silicon based binder
Implementation Method 4
Molecular sieve blends comprising a low silica, hydrophilic zeolite blended with a hydrophobic silicon based binder
Data Source
AI summary
A molecular sieve blend with improved performance characteristics produced by preparing or obtaining a hydrophilic zeolite, particularly a hydrophilic zeolite A with a low SiO2:Al2O3 ratio, preparing or obtaining a hydrophobic silicon based binder, particularly a hydrophobic colloidal silica or a hydrophobic siloxane based material, mixing the zeolite with the silicon based binder and, in one embodiment, a seed containing small quantities of a clay binding agent and the zeolite, to form a mixture, and forming the mixture into the molecular sieve blend.