Brief introduction to the steps of the hottest ads

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Introduction to the steps of adsorption process

industrial adsorption process usually includes two steps: adsorption operation and desorption and regeneration of adsorbent. Sometimes it is not necessary to recover the adsorbate and adsorbent, so this step is to replace the new adsorbent. In most industrial adsorption devices without grading in the whole process, the problem of multiple use of adsorbent should be considered. Therefore, in addition to adsorption equipment, desorption and regeneration equipment must be provided in the adsorption operation process

there are many ways to desorb, so customers can use our machine with more confidence. According to the adsorption equilibrium properties, increase the temperature and reduce the partial pressure of adsorbate to change the equilibrium conditions to desorb the adsorbate. According to different desorption methods in industry, the adsorption separation process has the following adsorption cycles

(1) temperature swing adsorption cycle temperature swing adsorption cycle is to adsorb at a lower temperature. At a higher temperature, the adsorption capacity of the adsorbent decreases so that the adsorbed components are desorbed, that is, the temperature change is used to complete the cycle operation. As shown in Figure 17-1. The successful maiden flight of the C919 aircraft is widely used in industry, such as gas drying, feed gas purification, removal or recovery of low concentration solvents from waste gas, and waste gas and waste liquid treatment in environmental protection

(2) pressure swing adsorption cycle pressure swing adsorption cycle is to adsorb at a higher pressure and desorb the adsorbate at a lower pressure (reducing the system pressure or vacuumizing), that is, to complete the cycle operation by using the change of pressure, as shown in Figure 17-2. The application scope of PSA cycle technology in the field of gas separation and purification is expanding day by day, such as recovering hydrogen from the purge gas of synthetic ammonia, purifying carbon monoxide from the mixed gas containing carbon monoxide, decarbonizing synthetic ammonia conversion gas, purifying natural gas, producing oxygen enriched by air separation, producing pure nitrogen by air separation, concentrating methane from coal mine gas, concentrating ethylene from the mixed gas rich in ethylene Purification of carbon dioxide from carbon dioxide mixture

(3) variable concentration adsorption cycle uses inert solvent washing or extractant extraction to desorb the adsorbate, so as to complete the cycle operation. As shown in Figure 17 - March 2015. This method is only applicable to the desorption of adsorbate with weak adsorption, easy desorption and little value

(4) the replacement adsorption cycle uses other adsorbents to replace the original adsorbent from the adsorbent, so as to complete the cycle operation, as shown in Figure 17-4. One of its applications is to use 5A molecular sieve to separate straight chain paraffin (c10-c18) from mixtures containing branched and cyclic hydrocarbons, and use ammonia as the replacement gas, because ammonia can be easily separated from paraffin by flash evaporation

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