Spherical Activated Carbon Adsorbents for Toxin Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing activated carbon adsorbents have insufficient microporosity and mechanical stability, which limits their effectiveness in applications requiring high adsorption capacity and resistance to mechanical stress, such as toxin and odor removal from gas streams and sorptive storage of gases like hydrogen.
Innovation Solution
Development of high-performance adsorbents based on spherical activated carbon with specific porosity and surface area characteristics, including a high proportion of micropores, high BET surface area, and enhanced mechanical resilience, achieved through the carbonization and activation of gel-shaped sulfonated styrene/divinylbenzene copolymers under controlled conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If activated carbon is produced with high porosity to increase adsorption capacity, then micropore volume and BET surface area are improved, but mechanical stability and abrasion resistance deteriorate
Solution Approach 1:
The patent uses gel-shaped sulfonated styrene/divinylbenzene copolymers as composite starting materials that combine the benefits of high porosity development during carbonization with inherent structural integrity. The gel structure provides a three-dimensional network that maintains mechanical strength while allowing extensive micropore formation, resolving the contradiction between high adsorption capacity and mechanical stability.
Solution Approach 2:
The patent applies controlled carbonization and activation parameters to transform the gel structure into highly porous activated carbon while preserving mechanical integrity. By optimizing carbonization temperature, time, and activation conditions, the patent achieves high micropore volume (0.6-1.4 cm³/g) and BET surface area (1500-3000 m²/g) while maintaining abrasion resistance above 90% and compressive strength above 10 N.
2Strength
If multi-stage processes are used to produce spherical activated carbon, then geometric shape and abrasion resistance are improved, but production cost increases
Solution Approach 1:
The patent performs preliminary gel formation and sulfonation of styrene/divinylbenzene copolymers before carbonization. This preliminary preparation creates a pre-structured gel matrix that naturally forms spherical shapes during carbonization, eliminating the need for subsequent shaping stages and reducing production costs while maintaining high abrasion resistance.
Solution Approach 2:
The patent optimizes carbonization parameters (temperature, atmosphere, time) to directly produce spherical gel-shaped activated carbon in a single stage. By controlling these parameters, the patent achieves spherical geometry with high abrasion resistance without requiring multi-stage processing, thereby reducing manufacturing complexity and cost.
3Reliability
If conventional activated carbon is used for toxin and odor removal, then general adsorption properties are sufficient, but microporosity is insufficient for high-performance applications
Solution Approach 1:
The patent employs gel-shaped sulfonated styrene/divinylbenzene copolymers as starting materials that inherently form highly porous structures during carbonization. The gel structure creates extensive micropore networks with volumes of 0.6-1.4 cm³/g, providing superior adsorption effectiveness for toxins and odors compared to conventional activated carbon with lower micropore volumes.
Solution Approach 2:
The patent creates local quality variations within the gel structure during carbonization, forming regions of different porosity and carbon density. This results in a heterogeneous structure with optimized micropore distribution that enhances adsorption capacity for specific contaminants while maintaining structural integrity.
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 resulting adsorbents exhibit superior adsorption capacity, mechanical resistance, and abrasion resistance, making them suitable for demanding applications such as NBC protective clothing and hydrogen storage, while maintaining a high micropore volume and surface area.
Implementation Method 1
The beads obtained in this way are carbonized and then activated
Implementation Method 2
for the adsorption of toxins, pollutants and odors, in particular from gas or air streams
Implementation Method 3
for use in medicine or pharmacy, as a sorption storage for gases, especially hydrogen
Data Source
Figure 1
Figure 2
AI summary
The invention relates to high-performance adsorbents based on activated carbon with high microporosity, in the form of discrete activated carbon granules, preferably in spherical form, which are characterized by the following parameters: • a total pore volume according to Gurvich of at least 0.7 cm³/g, wherein at least 70% of this total pore volume is formed by micropores with pore diameters of s 20 Å, • a mean pore diameter of at most 30 Å, and • a BET surface area of at least 1,500 m²/g. These high-performance adsorbents are particularly suitable for the adsorption of toxins, pollutants, and odors, especially from gas or air streams, for the purification or treatment of gases, such as air, for use in medicine and pharmaceuticals, and as sorption storage media for gases, especially hydrogen.