【Daily Question】Chemical Engineering Principles 296: Factors Affecting Resins (January 16)
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This post was last edited by “Back to Cambridge” on January 27, 2016, at 13:34. Starting today, the Chemical Engineering Theory section is launching the “Question of the Day” activity, aimed at helping everyone reinforce their fundamental knowledge in chemical engineering. Subsequently, series such as “Principles of Chemical Engineering”, “Mass Transfer and Separation”, “Chemical Thermodynamics”, and “Chemical Process Technology” will also be introduced. We hope for your active participation! Wishing you all a Merry Christmas~~ For responses to the “Question of the Day” activity, answers can be viewed directly; however, the thread will be closed after one day! ! To encourage everyone’s continued participation this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points if you answer correctly~~~ Short answer question: What are the main factors that affect the working exchange capacity of resins? Answer: 1) Composition of ion concentrations in the influent water ； 2) Control indicators for the exchange endpoint ； 3) Resin layer height ； 4) Water flow velocity, water temperature ； 5) Regeneration efficiency of the exchange agent, properties of the resin itself.
1. Regeneration method: Countercurrent regeneration has a higher working exchange capacity than forward flow regeneration. 2. Control parameters for ion concentrations in the feed water and the exchange endpoint: The higher the ion concentrations in the feed water and effluent, the greater the working exchange capacity. 3. Height of the resin layer: The higher the resin layer, the greater the working exchange capacity. 4. Flow rate: Too fast or too slow a flow rate is not conducive to ion exchange; therefore, the flow rate should be moderate. 5. Water temperature: A higher water temperature is favorable for ion exchange; generally, 25°C to 50°C is appropriate. 6. There are also quality defects in the resin itself.
(1) Quality of water quality in the incoming water； (2) Control indicators for exchange endpoints ； (3) Height of the resin layer ； (4) Water temperature and flow velocity ； (5) Effect of regenerating the exchange agent, properties of the resin itself.
1/Resin amount, contact area； 2/ Flow rate, contact time ； 3/Ion saturation level.
Salt content, control endpoint, resin layer height, exchange rate
What are the main factors that affect the working exchange capacity of resins? (1) Regeneration method: Countercurrent regeneration has a larger working exchange capacity than forward flow regeneration. (2) Control parameters for ion concentrations in the influent water and the exchange endpoint: The higher the ion concentrations in both the influent and effluent waters, the greater the working exchange capacity. (3) Height of the resin layer: The higher the resin layer, the greater the working exchange capacity. (4) Flow rate: Too fast or too slow a flow rate is not conducive to ion exchange; therefore, the flow rate should be moderate. (5) Water temperature: A higher water temperature is favorable for ion exchange; generally, 25°C to 50°C is appropriate.
The working exchange capacity of resin refers to the exchange ability of ion exchange resin under certain operating conditions; it usually denotes the amount of substance of ions that can be exchanged per unit volume of wet resin, and is expressed in units of mmol/g, mol/m3, or mmol/L. The working exchange capacity of resin is influenced not only by the resin structure but also by factors such as the composition of the solution, flow rate, temperature, control of the exchange endpoint, as well as the regenerant and regeneration conditions; therefore, the working exchange capacity of resin serves as a measure of the actual exchange capacity of ion exchange resins.
What are the main factors that affect the working exchange capacity of resins? Answer: 1) Composition of ion concentrations in the influent water ； 2) Control indicators for the exchange endpoint ； 3) Resin layer height ； 4) Water flow velocity, water temperature ； 5) Regeneration efficiency of the exchange agent, properties of the resin itself.
Answer: The factors that affect the working exchange capacity of resin are related not only to the properties of the ion exchange resin itself but also to the following factors: (1) The working exchange capacity is higher for counter-current regeneration than for forward-current regeneration. (2) The ion concentration in the feed water, the control parameter for the exchange endpoint, and the ion concentration in the effluent also determine the working exchange capacity. (3) Quality of the regeneration reagent, control of regeneration process conditions. (4) Flow rates that are too fast or too slow are not conducive to ion exchange, affecting the exchange capacity of the resin. (5) A high water temperature is favorable for ion exchange; generally, 25–50°C is appropriate. (6) For ions with high selectivity coefficients, the working exchange capacity of the resin must be correspondingly high. (7) The more thoroughly the resin is regenerated, the greater its working exchange capacity. (8) Degree of contamination of the ion exchange resin.
In addition to being related to the properties of the ion exchange resin itself, it is also affected by the following factors: (1) Regeneration method: Countercurrent regeneration results in a higher working exchange capacity than co-current regeneration. (2) Control parameters for ion concentrations in the influent water and the exchange endpoint: The higher the ion concentrations in both the influent and effluent waters, the greater the working exchange capacity. (3) Height of the resin layer: The higher the resin layer, the greater the working exchange capacity. (4) Flow rate: Too fast or too slow a flow rate is not conducive to ion exchange; therefore, the flow rate should be moderate. (5) Water temperature: A higher water temperature is favorable for ion exchange; generally, 25°C to 50°C is appropriate.
The factors that affect the working exchange capacity of resin are related not only to the properties of the ion exchange resin itself but also to the following factors: 1. The working exchange capacity is higher with counter-current regeneration than with forward-current regeneration. The ion concentration in the feed water, the control parameter for the exchange endpoint, and the ion concentration in the effluent also determine the working exchange capacity. 3 Quality of regeneration agents, control of regeneration process conditions. 4 A water flow rate that is too fast or too slow is not conducive to ion exchange, affecting the exchange capacity of the resin. 5 A high water temperature is favorable for ion exchange; generally, 25–50°C is appropriate. For the types of ions in the feed water, for those with high selectivity coefficients, the working exchange capacity of the resin must be correspondingly high. 7 The more thoroughly the resin is regenerated, the greater its working exchange capacity. 8 Degree of contamination of the ion exchange resin.