Membrane PSA: [Weekly Topic] {November 9, 2011} What principles should be followed in selecting adsorbents?
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This post was last edited by QQ Yongbuyanbei on 11/9/2011 at 11:03. The Membrane Separation and PSA Discussion Forum is launching a \"Weekly Topic\" series on the basics of PSA pressure swing adsorption; we invite all forum members to participate actively. Purpose of the activity: To deepen the knowledge already acquired, and to improve and strengthen the basic theoretical knowledge of all participants through answering questions, thereby reinforcing what they already know and helping them recall what they have forgotten. There must be a reward for the participants. Please do not edit after replying! Question: What principles should be followed in selecting adsorbents? Answer: (1) The adsorbent’s good adsorption capacity for impurities ； (2) The separation coefficient of the adsorbent between various groups should be as large as possible ； (3) Resolution of the contradiction between adsorption and regeneration of the adsorbent ； (4) The adsorbent should have sufficient strength to reduce the rate of fragmentation and wear.
The last edit to this post was made by QQ Yongbuyanbei on 2011-11-7 at 17:38; 1. Adsorbents should have a high adsorption capacity, and generally, those with a larger specific surface area possess stronger adsorption capabilities. 2. The adsorbent must possess good adsorption selectivity; since different adsorbents exhibit varying degrees of preferential adsorption capacity due to differences in their composition and structure, only those with good selectivity can effectively purify gaseous mixtures in an economical manner. 3. The adsorbent should be easy to regenerate, that is, the equilibrium adsorption capacity should be sensitive to temperature or pressure. 4. The adsorbent should have certain mechanical strength and wear resistance, stable performance, a low pressure drop across the bed, and be inexpensive.
High separation efficiency, low cost, and easy analysis
It should be followed that: 1. The adsorbent has good adsorption capacity for impurities； 2. The separation coefficient of the adsorbent between different groups should be as large as possible ； 3. Resolution of the contradiction between adsorption and regeneration of the adsorbent ； 4. The adsorbent should have sufficient strength to reduce the rate of fragmentation and wear.
Answer: (1) The adsorbent has good adsorption capacity for impurities； (2) The separation coefficient of the adsorbent between various groups should be as large as possible ； (3) Resolution of the contradiction between adsorption and regeneration of the adsorbent ； (4) The adsorbent should have sufficient strength to reduce the rate of fragmentation and wear.
1. The adsorbent should have a high adsorption capacity; generally, adsorbents with a larger specific surface area possess stronger adsorption capabilities. 2. The adsorbent must possess good adsorption selectivity; since different adsorbents exhibit varying degrees of preferential adsorption capacity due to differences in their composition and structure, only those with good selectivity can effectively purify gaseous mixtures in an economical manner. 3. The adsorbent should be easy to regenerate, that is, the equilibrium adsorption capacity should be sensitive to temperature or pressure. 4. The adsorbent should have certain mechanical strength and wear resistance, stable performance, a low pressure drop across the bed, and be inexpensive.
1. The adsorbent should have a high adsorption capacity; generally, adsorbents with a larger specific surface area possess stronger adsorption capabilities. 2. The adsorbent must possess good adsorption selectivity; since different adsorbents exhibit varying degrees of preferential adsorption capacity due to differences in their composition and structure, only those with good selectivity can effectively purify gaseous mixtures in an economical manner. 3. The adsorbent should be easy to regenerate, that is, the equilibrium adsorption capacity should be sensitive to temperature or pressure. 4. The adsorbent should have certain mechanical strength and wear resistance, stable performance, a low pressure drop across the bed layer, and be inexpensive
1. Good adsorption capacity of the adsorbent for impurities. 2. A high separation coefficient between different groups by the adsorbent. 3. Resolution of the conflict between adsorption and regeneration by the adsorbent. 4. The adsorbent must have sufficient strength to reduce fragmentation and wear rates
High separation efficiency, low cost, and easy analysis
1. Strong adsorption capacity for impurities, weak adsorption capacity for the target product. 2. Affordable price. 3. Strong adsorption capacity under pressure and strong regeneration capacity under reduced pressure. 4. High strength. 5. Strong resistance to poisoning