【Daily Question】Chemical Engineering Principles 338: Resin Working Layer (March 14)
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This post was last edited by “Back to Cambridge” on March 21, 2016, at 15:09. Starting today, the Chemical Engineering Theory section will launch the “Question of the Day” activity, aimed at helping everyone reinforce their basic knowledge of chemical engineering. Subsequently, series such as “Fundamentals 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 replies to the “Question of the Day” activity, answers can be viewed directly; however, the thread will be closed after one day! ! To encourage continued participation from everyone this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points for correct answers~~~ Short answer question: What is the working layer of ion exchange resin? Answer: When water flows through the resin layer, due to the limitations imposed by the ion exchange rate, it takes a certain thickness of the layer for the ion concentration in the water to drop to the desired level; this is what happens during this process. Ions in water continuously diffuse into the interior of the resin particles; this layer of resin is commonly referred to as the working layer.
Ion exchange resins are insoluble polymer compounds with a network structure and functional groups (active groups that can exchange ions). They are usually spherical particulate matter. Working layer: As soon as the solution comes into contact with the resin, an ion exchange reaction begins. As the water flows, the composition of the solution and that of the resin keep changing; in other words, the higher up one is in the layer, the greater the Ca2+ concentration in that layer ； The further down the water flows, the lower the Ca2+ concentration in it. When the water reaches a certain depth, the ion exchange reaction reaches equilibrium, and the concentrations of the ions Na+ in both the resin and the solution no longer change. At this point, from the start of the exchange reaction in the upper layer of the resin until equilibrium is reached in the lower layer, an ion exchange reaction zone of a certain height is formed, which is known as the exchange zone or active layer. At the beginning of water flow, since the ion exchange reaction has just started and the exchange zone has not yet taken shape, it takes some time for an exchange zone of a certain height to form.
The full name of an ion exchange resin consists of the classification name, the skeleton (or gene) name, and the basic name. Porous structures are divided into gel-type and macroporous types; those with a physical pore structure are referred to as macroporous resins, with the term “macroporous” added before their full name. Those classified as acidic should have “yang” added before their name, while those classified as basic should have “yin” added before their name. For example, the macroporous acidic cation exchange resin in our MTBE reactor, and so on
Answer: While the exchanger is in operation, three zones are formed within the resin layer: the uppermost layer of spent resin (referred to as the spent layer or saturated layer), the middle layer, which is the exchange layer (also known as the active layer), and the lowest layer, which is the unexchanged layer.
It is placed in a resin column to function, which helps it perform its role and facilitates regeneration.
Ion exchange resins are insoluble polymer compounds with a network structure, featuring active groups carrying functional groups that can exchange ions; they are usually in the form of spherical particles
What is an ion exchange resin working layer? As soon as the solution comes into contact with the resin, an ion exchange reaction begins. As the water flows, the composition of the solution and that of the resin keep changing; in other words, the higher up one is in the layer, the greater the Ca2+ concentration in that layer ； The further down the water flows, the lower the Ca2+ concentration in it. When the water reaches a certain depth, the ion exchange reaction reaches equilibrium, and the concentrations of the ions Na+ in both the resin and the solution no longer change. At this point, from the start of the exchange reaction in the upper layer of the resin until equilibrium is reached in the lower layer, an ion exchange reaction zone of a certain height is formed, which is known as the exchange zone or active layer.
What is an ion exchange resin working layer? As soon as the solution comes into contact with the resin, an ion exchange reaction begins. As the water flows, the composition of the solution and that of the resin keep changing; in other words, the higher up one is in the layer, the greater the Ca2+ concentration in that layer ； The further down the water flows, the lower the Ca2+ concentration in it. When the water reaches a certain depth, the ion exchange reaction reaches equilibrium, and the concentrations of the ions Na+ in both the resin and the solution no longer change. At this point, from the start of the exchange reaction in the upper layer of the resin until equilibrium is reached in the lower layer, an ion exchange reaction zone of a certain height is formed, which is known as the exchange zone or active layer.
What is an ion exchange resin working layer? Hidden content of this post: Answer: When water flows through the resin layer, due to the limitations imposed by the ion exchange rate, it takes a certain distance through the layer before the ion concentration in the water can be reduced to the desired level; during this process. Ions in water continuously diffuse into the interior of the resin particles; this layer of resin is commonly referred to as the working layer.
From the start of the exchange reaction in the upper layer of the resin until equilibrium is reached in the lower layer, an ion exchange reaction zone of a certain height is formed, which is known as the exchange zone or active layer.
This post was last edited by wang*nhua77020 on 2016-3-14 22:02. The ion exchange reaction begins as soon as the solution comes into contact with the resin. As the water flows, the composition of the solution and that of the resin keep changing; in other words, the higher up one is in the layer, the greater the Ca2+ concentration in that layer ； The further down the water flows, the lower the Ca2+ concentration in it. When the water reaches a certain depth, the ion exchange reaction reaches equilibrium, and the concentrations of the ions Na+ in both the resin and the solution no longer change. At this point, from the start of the exchange reaction in the upper layer of the resin until equilibrium is reached in the lower layer, an ion exchange reaction zone of a certain height is formed, which is known as the exchange zone or working layer