Silica Adsorbent Functionalization for Siloxane Removal
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Solution Overview
Problem
Conventional methods for removing siloxane from biogas, such as cooling, chilling, solvent absorption, and adsorption, face challenges like high maintenance costs, explosion hazards, and inefficient operation, particularly in biogas power generation systems, where existing adsorbents struggle with optimal adsorption and desorption at operating temperatures.
Innovation Solution
A method for preparing a silica adsorbent by bonding OH functional groups to silica particles, optimizing their number and spacing to enhance adsorption and desorption performance at specific temperatures, allowing for efficient siloxane removal and regeneration, thereby reducing maintenance costs and improving operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adsorbents are used for siloxane removal, then adsorption can occur, but desorption requires separate temperature adjustment and the adsorbent cannot be easily regenerated
Solution Approach 1:
The patent modifies the chemical parameters of the adsorbent by introducing specific functional groups (ammonium, amine, or carbamate groups) with controlled densities and strengths. This enables the adsorbent to selectively bind siloxane through chemical interaction while allowing easy thermal desorption, resolving the contradiction between effective adsorption and easy regeneration
Solution Approach 2:
The patent creates a composite adsorbent structure combining silica support material with organic functional groups (ammonium, amine, or carbamate). This composite structure provides both the mechanical stability of silica and the selective chemical interaction of organic groups, enabling effective siloxane removal and easy regeneration through temperature adjustment
2Quantity of substance
If carbon-based activated carbon adsorbent is used, then adsorption capacity increases, but adsorption tower scale and maintenance cost increase excessively
Solution Approach 1:
The patent utilizes silica material with controlled pore structure and surface area, functionalized with specific groups to enhance siloxane affinity. The porous silica structure provides high surface area for adsorption without requiring excessive tower scale, achieving high adsorption capacity with compact design and reduced maintenance costs
3Productivity
If adsorbent is designed for high adsorption rate, then siloxane removal efficiency improves, but desorption rate decreases requiring separate temperature adjustment
Solution Approach 1:
The patent designs the adsorbent with dynamic response to temperature changes. The functional groups (ammonium, amine, or carbamate) provide strong chemical interaction for adsorption at operating temperature, but allow rapid desorption when temperature is adjusted, enabling the adsorbent to dynamically adapt between high adsorption rate and high desorption rate based on operational conditions
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 silica adsorbent achieves high adsorption (99% or more) at 25° C. to 50° C. and desorption (99% or more) at 120° C. to 150° C., enabling continuous use and optimizing economic efficiency in biogas systems by adjusting adsorption and desorption temperatures as needed.
Implementation Method 1
a method of preparing a silica adsorbent by bonding OH functional groups to silica particles, optimizing their number and spacing to enhance adsorption and desorption performance
Data Source
AI summary
A method of preparing an adsorbent for removing siloxane, in which the method includes mixing a silica particle and an OH compound to bond OH functional groups to the silica particle; measuring percentage by weight of OH bonded to the silica particle; calculating a bonding number and spacing of the OH functional groups by the percentage by weight of OH bonded to the silica particle; performing an evaluation of an adsorption rate and desorption rate of the silica particle to which the OH functional groups, of which the bonding number and spacing are calculated, are bonded; and adjusting the bonding number of the OH functional groups in the silica particle according to the evaluation.