10-Ring Molecular Sieve for C8 Hydrocarbon Separation
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Solution Overview
Problem
Current methods struggle to effectively separate mixtures of structurally similar unsaturated hydrocarbons, particularly eight-membered monocyclic unsaturated hydrocarbons from mixtures containing additional nonlinear unsaturated C8H2m hydrocarbons with similar molecular weight and polarity, due to limitations in size and shape differences.
Innovation Solution
The use of a 10-ring pore molecular sieve with a sieving channel having a minimum crystallographic free diameter greater than 3 Å and a T1/T2 ratio ≥20:1, where T1 is Si or Ge and T2 is Al, B, or Ga, and counterions like NH4+, Li+, Na+, or Ca++, to selectively separate eight-membered monocyclic unsaturated hydrocarbons by contacting the hydrocarbon mixture at temperatures between -20° C. and 60° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation methods are used for structurally similar unsaturated hydrocarbons, then the separation process is simple and low-cost, but the separation efficiency and purity are insufficient
Solution Approach 1:
The patent employs molecular sieves with specific pore structures (8-ring, 10-ring, or 12-ring apertures) to separate unsaturated hydrocarbons based on molecular size and shape. The porous material selectively adsorbs target molecules while excluding others, achieving high separation purity for structurally similar compounds that conventional methods cannot effectively distinguish.
Solution Approach 2:
The molecular sieve material exhibits local quality through its heterogeneous pore structure with different aperture sizes (8-ring, 10-ring, or 12-ring). Each pore type provides a specific local environment that selectively interacts with hydrocarbons of particular dimensions, enabling precise separation based on local structural differences rather than bulk properties.
2Manufacturing precision
If molecular sieve separation is implemented to achieve high purity, then separation effectiveness improves, but the device complexity and operational requirements increase
Solution Approach 1:
The patent utilizes parameter changes by controlling temperature, pressure, and contact time during the molecular sieve separation process. By optimizing these parameters, the method achieves high separation purity while maintaining operational simplicity. The process can be conducted under mild conditions that do not require complex equipment or specialized operational procedures.
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 approach achieves high-purity separation of eight-membered monocyclic unsaturated hydrocarbons, with concentrations exceeding 99.3% wt, enabling the production of highly pure monomers for polymerization and reducing impurities in cyclic olefin monomers, suitable for various industrial applications.
Implementation Method 1
The 10-ring pore molecular sieve herein described has a sieving channel with a 10-ring sieving aperture with a minimum crystallographic free diameter greater than 3 Å and a maximum crystallographic free diameter to minimum crystallographic free diameter ratio between 1 and 2
Implementation Method 2
separation of mixtures of structurally similar components can still be challenging... separation of an eight-membered monocyclic unsaturated hydrocarbon from a hydrocarbon mixture further comprising additional nonlinear unsaturated C8H2m hydrocarbons
Data Source
AI summary
Described herein are compositions having an eight-membered monocyclic unsaturated hydrocarbon, methods and system to separate the eight-membered monocyclic unsaturated hydrocarbon from a hydrocarbon mixture including additional nonlinear unsaturated C8H2m hydrocarbons with 4≤m≤8, by contacting the hydrocarbon mixture with a 10-ring pore molecular sieve having a sieving channel with a 10-ring sieving aperture with a minimum crystallographic free diameter greater than 3 Å and a ratio of the maximum crystallographic free diameter to the minimum crystallographic free diameter between 1 and 2, the molecular sieve having a T1/T2 ratio ≥20:1 wherein T1 is an element independently selected from Si and Ge, and T2 is an element independently selected from Al, B and Ga, the 10-ring pore molecular sieve further having a counterion selected from NH4+, Li+, Na+, K+ and Ca++.