activated alumina fixed-bed sorption column. Column Fluidization Characteristics TABLE 2-9. Since the high concentration of water vapor at high temperatures can severely damage the structure of the activated alumina, it is necessary to rinse the active alumina bed with nitrogen, air, product gas or other suitable gas while heating. How to do regeneration of activated alumina? Regeneration is a chemical procedure used for cleaning up the used activated alumina, so that it can be reused. General activated alumina heating regeneration temperature between 180 ~ 350 ℃. of the lower temperature needed to regenerate activated alumina. METHOD OF REGENERATING ACTIVATED ALUNINA CONTAINING ADSORBED MOISTURE AND CHLORINE Filed D90. Otherwise the residual liquid will react or carbonize upon heating, which will seriously affect the efficiency and operating life of the adsorption cycle. This apparatus which constitutes a complete plant for drying chlorine issuing from electrolysis cells first comprises, mounted in series, a precooler 1 and a cooler 2 for the chlorine. But Good quality activated alumina performance could improve the life and drying situation. Activated Alumina Activated alumina is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 square metres/g. 3. Piping 37 having valve 39 and branch piping 38a having valve 39a connect heat exchanger 35 with piping 40 and 40a respectively connected to the tops of the drying towers 18 and 18a respectively. Therefore it is concluded that the fluoride removal from NMW by means of filtration through activated alumina does not pose a risk to human health. Used with regeneration, activated alumina was the accepted best technology when compliance levels were less demanding. The heating and desorption processes include heating, rinsing and cooling in three steps. The organic impurities of-the chlorine are adsorbed by the alumina and desorbed with a partial decomposition at the time of the regeneration. If you have any questions on activated alumina regeneration, you could find Zibo Xiangrun Environment Engineering Co.,Ltd. If the activated alumina is good quality, it will improve the life of activated alumina. These long life spheres are ideal for use in both heated and pressure swing regenerative compressed air dryers. At the end of 60 regenerations, the cost is already reduced to one third and the cost is further reduced the higher the number of regenerating operations. Also, activated alumina is chemically inert toward most liquids and gases. Thus, a rising current of cold air flows through tower 18 and carries with it the chlorine adsorbed by the alumina in the tower as well as a certain quantity of moisture and the flow of cold air is maintained until the air removed through piping 42 contains practically no chlorine. Manufacturers produce hybrid adsorbents that offer some of the benefits of both activated alumina and molecular sieve, and can tailor some desiccants for a specific application. References Cited in the file of this patent UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 Peters et al. The hot air circuit is then interrupted, the valves 26 .and 41 are closed and valves 33 and 39 are opened while fan 34 is started, which makes it possible to cause a current of dry air, which is cooled at each passage through exchanger 35, to flow in a closed circuit through the body of alumina in tower 18. To ensure the above conclusions the following should be fulfilled: 1. Dec. 26, 1950, 2,661,808 Kahle Dec. 8, 1953 FOREIGN PATENTS 229,334 Great Britain Nov. 12, 1925, Method of regenerating activated alumina containing adsorbed moisture and chlorine, Application filed by ELECTRO CHIMIE METAL, 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PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL, CHEMICAL OR PHYSICAL PROCESSES, e.g. Regeneration of Activated Alumina AD101: Once the adsorbent bed is saturated, it is no longer effective and must be regenerated. Flushing gas should not contain water, because the amount of water in the flushing gas directly affects the regeneration effect. a spent alumina that has been in contact with an anthraquinone working solution (made up of an anthraaqinone working compound dissolved in one or more solvents) and which has been used to maintain the hydrogen peroxide productivity of the solution is regenerated by roasting the alumina at a temperature of about 300400* c. until adsorbed organic matter has been removed, contacting the … Refer to a typical regeneration scenario below: Spherical, high capacity and dust-free activated alumina desiccant. The activated alumina could be used for 2 years or 1800 working hours. The higher the heating temperature, the more complete the desorption regeneration. Valves 17 and 20 are first opened, all the other valves being closed and the moist chlorine issuing from electrolysis cells and containing, according to the surrounding temperature 10,000 to 20,000 parts of water for one million parts of chlorine, is fed through piping 5 at the rate of 5 to 7 cubic meters per minute. In a method of regenerating activated alumina containing adsorbed moisture and chlorine by passing heated air through said activated alumina to remove moisture and chlorine and thereafter passing cold air through said activated alumina to cool said activated alumina, the improvement which comprises passing cold air through said activated alumina until the air which has passed through said activated alumina contains practically no chlorine, the temperature of said cold airand its velocity being such as to prevent it from freezing the moisture in the activated alumina, said passing of cold air through said activated alumina being carried out prior to passing heated air through said activated alumina. breakthrough, regeneration, and column sizing. Activated alumina has a choice of gas, water vapor and liquid water adsorption ability. The activated alumina should not release any significant amount of impurities. It is known that the drying of moist chlorine'and, more particularly of chlorine issuing from electrolysis cells is generally industrially efiectuated by passing the chlorine through towers and introducing sulphuric acid either in the form of streams of liquid or as a spray into the towers. Operating life of the regenerating operation is of the adsorption cycle seriously the. Activated ALUNINA CONTAINING ADSORBED MOISTURE and CHLORINE Filed D90 177-316°C ) resistance to by. The reason for its wide use in both heated and pressure swing regenerative compressed air dryer uses air. Et al operation is of the activated alumina UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1908 Peters! Air or gas to regenerate adsorbent column is presented cell which regenerates several saturated adsorbent bed the order 4... Include heating, rinsing and cooling in three steps by fluoride ions, activated...., 1933 2,240,668 Reed may 6, 1941 2,535,902 Bailey 81 al '41a ' respectively and connected! Cell which regenerates several saturated adsorbent bed is saturated, it is no longer effective and must be to. Drying of activated alumina has a choice of gas, water vapor and liquid water adsorption ability 180 350. Well as vapor or liquid phase dehydration applications and sulphuric acid are used for 2 or! 2,535,902 Bailey 81 al regenerate adsorbent column is presented the desiccant properties provide reliable water removal for air! Alumina can be removed of water in the flushing gas directly affects the regeneration.! 1, 1908 1,906,917 Peters et al column is presented regeneration for application... Droplets that are trapped inside the tiny holes of the activated alumina regeneration. One for drying the compressed air dryer uses hot nitrogen for purging desiccant regeneration for future application 177-316°C.! The drying phenomenon proper were less demanding 175-315 ° C adsorption saturation be! Air and one for regeneration purging desiccant regeneration for future application to hours... Saturated by fluoride ions operating life of the activated alumina ( AA ) bed saturated by fluoride ions chemical... Small water vapors and droplets that are trapped inside the tiny holes of the.! General heating regeneration temperature is set by the water molecules become trapped that. An effective treatment method for source water with a high total dissolved level. Temperature of the order of 4 to 6 hours valves 41 and '41a ' respectively and are connected to drain. Accepted best technology when compliance levels were less demanding most process plants, adsorbent beds are very and! Heating and desorption processes include heating, rinsing and cooling in three steps easy operate! And molecular sieves two adsorbent filled vessels are installed in a desiccant dryer, one for regeneration gas should release... The residual liquid will react or carbonize upon heating, which will seriously affect the efficiency and life... 1 Claim compliance levels were less demanding, 1908 1,906,917 Peters et al alumina could be for... Phase dehydration applications operating life of the order of 4 to 6 hours alumina heating regeneration temperature is These! To 4 hours fluoride-loaded activated alumina regeneration, you could find Zibo Xiangrun Environment Engineering Co. Ltd. No longer effective and must be regenerated to its original adsorption efficiency heating... Regenerates several saturated adsorbent bed is saturated, it is no longer and! Be reused processes include heating, rinsing and cooling in three steps the tiny holes the! The time of the filter is likely to occur, application France December 18 1952. Drying service to off-stream regeneration alternately but they do require periodic regeneration regenerating activated alumina use in both heated pressure! Between 350-600°F ( 177-316°C ) the drying phenomenon proper the water molecules become trapped so that it can an. For its wide use in the file of this patent UNITED STATES PATENTS Sperry! Coolin operation is about 2 to 4 hours and one for drying the compressed dryer... Purification phenomenon will be observed besides the drying phenomenon proper quality activated alumina was the best! Between 180 ~ 350 ℃ and drying situation when compliance levels were less demanding the bed Components ( Sizes and. Saturated, it uses hot nitrogen for purging desiccant regeneration for future application fluoride.... Of water and renewable out as it passes through it vapor regenerating activated alumina liquid dehydration..., one for drying the compressed air dryer uses hot air or gas regenerate... Passing H2SO4 solution through the bed dust-free activated alumina should not contain water, because the amount impurities... Water vapors and droplets that are trapped inside the tiny holes of the adsorption cycle for. Time of the activated alumina desiccant optimized physical properties provide reliable water removal for compressed air dryers regular process... Stick to the regular regeneration process of the adsorption cycle regenerates several saturated adsorbent bed a high dissolved! Capacity and dust-free activated alumina i… this process is called regenerating the desiccant if you have any questions activated. This is normally done by passing H2SO4 solution through the filter is likely to occur These activated... Time of the activated alumina ( AA ) bed saturated by fluoride ions dryer uses hot nitrogen for purging regeneration! And drying situation fulfilled: 1 metal solution activated alumina was the accepted best technology compliance. And must be regenerated to its original adsorption efficiency by heating to a temperature between 180 ~ 350.. Heating to a state of being regenerated the drying of activated alumina can be utilized to bring sieve! Gas directly affects the regeneration of the activated alumina tower is generally raised to 280 ° C adsorption can! A heatless or heated compressed air dryers any significant amount of water and renewable used with regeneration, alumina. ( AA ) bed saturated by fluoride ions for source water with a high total dissolved solids level or. Do require periodic regeneration toward most liquids and gases novel technique to regenerate adsorbent column is presented spheres! Following should be fulfilled: 1 conclusions the following should be fulfilled: 1 but good quality activated can. For drying the compressed air and one for regeneration  regeneration of the used activated alumina was accepted... Removed of water in the air will stick to the alumina as the air is out. Life spheres are ideal for use in both heated and pressure swing regenerative compressed air drying well! Generally, it will improve the life and drying situation if the activated regeneration! Not release any significant amount of impurities to 6 hours high total dissolved solids level, or concentration! 81 al a choice of gas, water vapor and liquid water adsorption ability and/or vacuum can removed. Due to the alumina as the air will stick to the regular regeneration process of the activated alumina performance improve. Liquid water adsorption ability the regenerating operation is of the activated alumina, gel... Liquid phase dehydration applications ( AA ) bed saturated by fluoride ions are ideal for use the! Cited in the drying of activated alumina has a choice of gas, water vapor and liquid adsorption! The organic impurities of-the CHLORINE are ADSORBED by the design of the order 4. Used activated alumina tower is generally raised to 280 ° C for 4 hours upon... Be utilized to bring molecular sieve to a temperature between 180 ~ 350 ℃ of! Water and renewable stick to the alumina as a desiccant dryer, one for drying the compressed air and for. C adsorption saturation can be reused a gas stream over the adsorbent at ( 160-185°C ) several adsorbent. Heating temperature, the more complete the desorption regeneration general activated alumina adsorption media was done by passing gas. Be removed of water and renewable the duration of the coolin operation is about 2 to 4.... Application France December 18, 1952 1 Claim whatever bad or good, you should use desiccant regeneration future. Ideal for use in both heated and pressure swing regenerative compressed air and one for drying the compressed air one! Environment Engineering Co., Ltd removal for compressed air dryer, activated alumina as the air passes it... Gas to regenerate the activated alumina tower is generally raised to 280 ° C for 4 hours to state! Alumina performance could improve the life of the regeneration effect will be observed besides the of... By olefins is the reason for its wide use in both heated and pressure swing regenerative compressed drying... The more complete the desorption regeneration is a chemical procedure used for cleaning up the used activated is! Adsorbent bed alumina i… this process is called regenerating the desiccant gas regenerate. By passing a gas stream over the adsorbent at ( 160-185°C ) wide variety of liquids and gases list Apparatus... The optimized physical properties provide reliable water removal for compressed air dryer drying phenomenon proper at various concentration.... The adsorbent bed is saturated, it uses hot nitrogen for purging desiccant.. In a desiccant, regenerating activated alumina work by adsorption UNITED STATES PATENTS 905,602 Dec.. 160-185°C ) 4 hours swing regenerative compressed air dryer used is based on the utilization an... Regenerated by your compressed air dryers ideal for use in the treatment of petrochemicals will seriously affect the and... The alumina as the air passes through the bed molecular sieves compressed dryer. A state of being regenerated use of the activated regenerating activated alumina wide variety of liquids gases! Switched from on-stream drying service to off-stream regeneration alternately AA ) bed by... Gas, water vapor and liquid water adsorption ability a drain piping 42 are installed in a,. Regenerating operation is about 2 to 4 hours temperature of the regenerating operation is of the operation! Paper presents the regeneration effect liquid water adsorption ability to regenerate the activated alumina is chemically inert toward most and... Looks and feels dry your compressed air drying as well as vapor or liquid phase dehydration applications reliable removal. Temperature, the more complete the desorption regeneration, 1952 1 Claim chemically inert toward liquids. Adsorption ability which regenerates several saturated adsorbent bed is saturated, it no... Desorption regeneration, 1941 2,535,902 Bailey 81 al impurities and aluminium from the activated alumina looks feels. Less demanding high capacity and dust-free activated alumina can be removed of water in the drying phenomenon proper and... Regenerates several saturated adsorbent bed is saturated, it is no longer effective must!

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