Molecular Sieve Adsorption for Halide Removal in Hydrocarbon Processing
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Solution Overview
Problem
Hydrocarbon conversion processes using halogen-containing acidic ionic liquid catalysts result in hydrocarbon products with high organic halide concentrations, which are undesirable and pose safety and environmental concerns, necessitating a method to reduce these impurities.
Innovation Solution
Contacting the hydrocarbon products with molecular sieves having pore sizes from 4 to 16 Angstrom under organic halide absorption conditions to reduce the halogen concentration to less than 40 ppm, utilizing specific zeolites such as NaX and USY zeolites for effective absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If halogen-containing acidic ionic liquid catalysts are used in hydrocarbon conversion processes, then catalytic activity and reaction efficiency are improved, but organic halide contamination in the hydrocarbon product increases
Solution Approach 1:
The patent extracts and removes organic halide contaminants from the hydrocarbon product through a separate treatment step. The hydrocarbon product is contacted with a treatment medium (such as water, aqueous solutions, or ion-exchange resins) that selectively removes organic halides, separating the harmful impurities from the desired product while preserving the benefits of using ionic liquid catalysts
Solution Approach 2:
The patent introduces an intermediary treatment medium between the catalytic reaction and the final product. This intermediary (water, aqueous solutions, or ion-exchange resins) acts as a mediator that selectively interacts with organic halide contaminants, allowing them to be removed without affecting the hydrocarbon product quality or the catalytic process efficiency
2Manufacturing precision
If molecular sieves with pore sizes from 4 to 16 Angstrom are used for organic halide absorption, then organic halide concentration is reduced to less than 40 ppm, but the process complexity increases
Solution Approach 1:
The patent employs molecular sieves with specific pore sizes (4 to 16 Angstrom) as the treatment medium. These porous materials selectively adsorb organic halide contaminants based on their pore size, which is comparable to the molecular dimensions of organic halides. This physical sieving effect allows precise control of organic halide concentration in the hydrocarbon product while maintaining a relatively simple process configuration
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 method effectively reduces organic halide content in hydrocarbon products from 50 to 4000 ppm to less than 40 ppm, enhancing product quality and safety by removing harmful contaminants like HCl and dioxins, and allowing for multiple cycles of use with regeneration of the molecular sieve.
Implementation Method 1
contacting at least a portion of the hydrocarbon product with a molecular sieve having pore sizes from 4 to 16 Angstrom under organic halide absorption conditions to reduce the halogen concentration in the hydrocarbon products to less than 40 ppm
Data Source
AI summary
A method for reducing halide concentration in a hydrocarbon product having an organic halide content from 50 to 4000 ppm which is made by a hydrocarbon conversion process using an ionic liquid catalyst comprising a halogen-containing acidic ionic liquid comprising contacting at least a portion of the hydrocarbon product with at least one molecular sieve having pore size from 4 to 16 Angstrom under organic halide absorption conditions to reduce the halogen concentration in the hydrocarbon product to less than 40 ppm is disclosed.