The role of quartz sand in the hydration reactor
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The hydration reactor consists of four bed layers. Each bed layer is 4.3 meters high and is filled with hydration catalyst resin. There are support plates above and below each bed layer. The support plates are equipped with water caps in the vertical direction. The water cap has a slit of only 0.02mm. The function of the water cap is to ensure the normal passage of the medium and at the same time seal the catalyst resin to prevent the catalyst from leaking. The water cap also has the function of evenly dispersing the material.； This is a schematic structural diagram of a section of bed in a hydration reactor. The material enters from the bottom of the reactor and flows out from the top. The resistance drop generated when passing through each section of the bed is the pressure difference of the section of the bed. Generally, the pressure difference of each section of the bed is about 0.05Mpa. loading: Water cap + quartz sand (the particle size is larger than the catalyst, fill and cover the water cap), catalyst, inert resin (light density, large particle size, will float on the bed under the buoyancy of process water) Add quartz sand to the upper part of the water cap of the hydration reactor for 1: Prevent condensation from blocking the water cap function 2: Reduce water cap corrosion. In addition to these two functions, what are the other advantages of quartz sand?
In addition to preventing agglomerates from clogging the water cap and reducing water cap corrosion, quartz sand also has the following advantages:: 1. Conducive to uniform distribution of fluids: Quartz sand can increase the internal surface area of the reactor, which is beneficial to the uniform distribution of fluid, thereby improving reaction efficiency. 2. Strong ability to withstand pressure: Quartz sand has high pressure resistance, which can ensure the stability and safety of the bed. 3. Good high temperature resistance: Quartz sand has a high melting point, is not easy to soften and melt at high temperatures, and can withstand higher temperatures. 4. Good corrosion resistance: Quartz sand has good corrosion resistance and can withstand acid, alkali, oxidation and other corrosion caused by some chemical reactions. 5. The price is relatively cheap: Compared with other materials, quartz sand is relatively cheap and can contribute to the cost control of the entire reactor. .
The bottom device of the catalyst bed is filled with wear-resistant inert filler (quartz sand) with a larger bulk density than the resin catalyst, which can avoid direct contact between high-speed materials and the resin catalyst.* * It reduces the damage of the resin catalyst, effectively controls the pressure drop in the reactor, and reduces the impact of catalyst fragments on subsequent processes.
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In addition to the above-mentioned functions of preventing agglomerates from clogging the water cap and reducing water cap corrosion, quartz sand also has the following advantages:: 1. Enhance the catalytic reaction Quartz sand can improve the activity and stability of the hydration catalyst and promote the catalytic reaction. 2. Improve mass transfer efficiency. The particle shape and size of quartz sand can adjust the distribution of materials in the bed and increase the porosity of the bed, thereby improving mass transfer efficiency. 3. Suppression of scaling The surface of quartz sand can absorb some impurity ions and inhibit the occurrence of scaling. 4. Maintain uniform catalyst distribution Quartz sand can maintain uniform distribution of catalyst resin and avoid problems such as uneven mass distribution in the bed. In short, adding quartz sand to the hydration reactor can improve the stability and reaction efficiency of the reactor and extend the service life of the reactor. However, before determining the specific quartz sand addition amount and particle size and other parameters, it is necessary to evaluate the sand bed performance under different conditions through experiments and calculations.