These include activated alumina, silica gel, and molecular sieves. Copyright © 2016 Zibo Xiangrun Environmental Engineering co., LTD. Gamma activated alumina(Catalyst carriers), Zibo Xiangrun Environment Engineering Co.,Ltd, Zibo Xiangrun Environmental Engineering co., LTD. Activated alumina can be an effective treatment method for source water with a high total dissolved solids level, or sulfate concentration. Aging. Also, activated alumina is chemically inert toward most liquids and gases. It may be easily understood that after tower 18a has been operating for 24 hours as an adsorber, it is cut out of operation and tower 18 is simultaneously put into action while the alumina content of said tower 18a is regenerated 'by a process similar to that'already described. 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. Two adsorbent filled vessels are installed in a desiccant dryer, one for drying the compressed air and one for regeneration. i. The higher the heating temperature, the more complete the desorption regeneration. Activated alumina is an excellent desiccant for drying a wide variety of liquids and gases. 3. We will explain it in our next news. 7. Finally, the regeneration of the used activated alumina adsorption media was done by passing H2SO4 solution through the bed. This is normally done by passing a gas stream over the adsorbent at (160-185°C). Generally, it uses hot nitrogen for purging desiccant regeneration. 14, 1953 ilnited States Patent METHOD OF REGENERATING ACTIVATED ALU- MINA CONTAINING ADSORBED MOISTURE AND CHLORINE Jean Gurin, Jarrie,'France, assignor to Societe dElectI-o- Chimie, dElectro-Metallurgie et des Acieries Electriques dUgine, Paris, France, a corporation of France Application December 14, 1953, Serial No. The compound is used as a desiccant (to keep things dry by absorbing water from the air) and as a filter of fluoride, arsenic and selenium in drinking water. General heating regeneration temperature is … 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. If the activated alumina is good quality, it will improve the life of activated alumina. A heatless or heated compressed air dryer uses hot air or gas to regenerate the activated alumina. 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. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS, Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium, Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof, Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material, Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04, Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite, NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C, Purification ; Separation of gaseous or dissolved chlorine, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE, CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS, Technologies relating to chemical industry, Improvements relating to the production of bulk chemicals, Organotin miticidal and insecticial compounds, Method and apparatus for concentrating chlorine gas, Process of separation of mixtures of the rare gases, Process for the purification and separation of gas mixtures, Simultaneous drying and sweetening of wellhead natural gas, Controlling the concentration of impurities in a gas stream, Regeneration of absorbent solutions used for removing gaseous acid impurities from gaseous mixtures, Glycol regenerator using controller gas stripping under vacuum, Processes for decontaminating nuclear process off-gas streams, Method and device for deacidifying a gas containing h 2?s and/or co 2? activated alumina fixed-bed sorption column. Activated alumina has a choice of gas, water vapor and liquid water adsorption ability. of Activated Alumina TABLE 2-7. The higher the heating temperature, the more complete the desorption regeneration. List of Apparatus Components (Sizes) and Chemical Reagents Used TABLE 4-1. 398,182. Adsorption and regeneration can be repeated. Thus a safety margin is insured and the alumina is economically used while remaining below the breaking-down capacity, whereafter one proceeds to the regeneration of the alumina contained in tower 18. In the drying of activated alumina,  regeneration of activated alumina is necessary. To ensure the above conclusions the following should be fulfilled: 1. In any case the leaching of impurities and aluminium from the activated alumina i… 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. Fluidized Activated Alumina Fluoride Removal Capacity TABLE 3-1. ●In the drying of activated alumina, regeneration of activated alumina is necessary. . The regeneration. 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, … Flushing gas should not contain water, because the amount of water in the flushing gas directly affects the regeneration effect. Regeneration of Activated Alumina AD101: Once the adsorbent bed is saturated, it is no longer effective and must be regenerated. Van Air Systems activated alumina requires the regenerating gas to be below approximately 60 ºF atmospheric dew point to provide a -40 ºF Pressure dew point after regeneration at 450ºF. 26, 1957 The precooler 1, the cooling of which in, the purified chlorine being removed through piping 21 with a moisture content of to, parts of water for one million parts of chlorine. Spherical, high capacity and dust-free activated alumina desiccant. Regeneration Molecular Sieve should be in typical cyclic systems constitutes removal of the adsorbate from the molecular sieve bed by heating and purging with a carrier gas. The zone which is saturated with moisture sinks little by little in the tower 18 and, after '24 hours and before the breaking down" pointi. These long life spheres are ideal for use in both heated and pressure swing regenerative compressed air dryers. The activated alumina could be used for 2 years or 1800 working hours. A thermostat 12, controlled through a thermo-element 13 immersed in the outlet side of the cooler 2, is arranged in order to regulate the opening of an inlet valve 14 interposed in the piping 10, for the brine. New requirements needed to be developed for higher uptake capacity and the ability to remove arsenic cost-effectively without regeneration or creating hazardous waste requiring special handling. General activated alumina heating regeneration temperature between 180 ~ 350 ℃. 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. 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. A piping 15 connects the base of the cooler 2, through two branch pipes 16 and 16ain which valves 17 and 17a respectively are interposed, with two drying towers 18 and 18a lined inside with a chlorine resisting lining preferably in the form of a brick-work and filled with 1.5 cubic meters of activated alumina which is arranged so as to allow the circulation, in contact therewith, of the cooled chlorine arriving through piping 15. But Good quality activated alumina performance could improve the life and drying situation. New requirements needed to be developed for higher uptake capacity and the ability to remove arsenic cost-effectively without regeneration or creating hazardous waste requiring special handling. 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. Our activated alumina has been developed with high attrition resistance and crush strength, It has larger water adsorption capacity comparing to molecular sieve at high relative humidity and providing long service life with performance at or below dew point specifications. 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. Certainly, whatever bad or good, you should use desiccant regeneration for future application. This is because of the strong interaction between water and activated alumina,  it is difficult to completely desorb the adsorbed water in other ways. May 2, 1933 2,240,668 Reed May 6, 1941 2,535,902 Bailey 81 al. However, a serious drawback to using activated alumina is that regenerating it requires the use of strong acid and base solutions that are undesirable for home storage and handling. The piping 40 and 40a are provided with valves 41 and '41a' respectively and are connected to a drain piping 42. Activated alumina desiccant is typically regenerated by your compressed air dryer. Heating rate of about 50 ℃ per hour. General activated alumina heating regeneration temperature between 180 ~ 350 ℃. Claims priority, application France December 18, 1952 1 Claim. Efficiency of Activated Alumina Regeneration, TABLE 2-8. METHOD OF REGENERATING ACTIVATED ALUNINA CONTAINING ADSORBED MOISTURE AND CHLORINE Filed D90. This process is called regenerating the desiccant. Used with regeneration, activated alumina was the accepted best technology when compliance levels were less demanding. Application: Adsorbing the alkali in fluid, XR107 activated alumina ball for hydrogen peroxide( activated alumina for H2O2) has the high regeneration capacity for hydrogenation degradation products, and it could transfer the hydrogenation degradation to anthraquinone to insure the stability of antheaquinone (Cl. After a restricted number of drying-regenerating cycles, the charge of activated alumina must be renewed and the method becomes expensive and, more particularly, more expensive than the drying operations with sulphuric acid, when considering both the cost of the alumina and the heat required to regenerate it. US2786816A US398182A US39818253A US2786816A US 2786816 A US2786816 A US 2786816A US 398182 A US398182 A US 398182A US 39818253 A US39818253 A US 39818253A US 2786816 A US2786816 A US 2786816A Authority US United States Prior art keywords chlorine activated alumina alumina piping tower Prior art date 1952-12-18 Legal status (The legal status is an assumption and is … breakthrough, regeneration, and column sizing. Due to the regular regeneration process of the activated alumina no microbiological contamination from the use of the filter is likely to occur. You could do it as your requirement. The duration of the coolin operation is about 2 to 4 hours. 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. Piping 25 is provided with a valve 26 and leads to the discharge side of a fan 27 which draws air, through a piping 28, through an air chamber 29 provided with a steam heating circuit 30 and/or with an electric heating device 31. The heating and desorption processes include heating, rinsing and cooling in three steps. The chlorine is cooled in passing through the unit precooler 1 and cooler 2, thermostat 12 being set in order to control the opening of the valve 14 and, accordingly, the quantity of brine passing through exchanger 9 so that the cooling water in cooler 2 is brought to a temperature of the order of 8 to 9 C. in order that the temperature ofthe chlorine at the outlet from cooler 2 is about 10 to 12 C. The chlorine which then shows a constant moisture which is of the order of 3,000 parts of water for one million parts of chlorine, passes through tower 18 in which the activated alumina adsorbs the moisture of the chlorine as well as the organicimpurities contained there- Patented Mar. The activated alumina should not release any significant amount of impurities. 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 m²/g. Heating rate of about 50 ℃ per hour. The water in the air will stick to the alumina as the air passes through it. Caustic soda and sulphuric acid are used for regeneration. It is also more etficacious than the method using sulphuric acid, since one succeeds, by drying chlorine with activated alumina and regenerating the alumina in accordance with the invention, in lowering the water content of the, chlorine to to 20 parts of water per one million parts of chlorine against 70 to 90 parts water per one million parts chlorine in an acid atomizing plant and 130 to 150 parts water per one million parts chlorine in the dripping towers. .One thus avoids the further presence of the hot and moist chlorine which would deteriorate the alumina during its regeneration and it is possible to use the same charge of alumina almost indefinitely. Activated Alumina Fluoride Removal Otherwise the residual liquid will react or carbonize upon heating, which will seriously affect the efficiency and operating life of the adsorption cycle. The actual temperature is set by the design of the unit. When activated alumina is used for liquids such as propylene drying, it is necessary to first drive the liquid of the activated alumina bed at the time of regeneration, without any dead ends. This paper presents the regeneration of the activated alumina (AA) bed saturated by fluoride ions. Activated alumina has beensuggested as a drying agent, but the method does not seem to have been retained since alumina has proved to be gradually deactivated, because of the adsorbed water and chlorine attacking the alumina at the time of the regeneration of the valumina, which generally is done by passing a current of hot air through the mass of alumina. The lower part of these towers is connected through pipe branches 19 and 19a, in whichvalves 20 and 20a respectively are interposed, with a piping 21 for the outlet of the dry chlorine. 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 … How to regenerate activated alumina? The regenerant uses sodium hydroxide solution, but also aluminum sulfate solution.The concentration of sodium hydroxide regenerant solution is 0.75%-1%, the sodium hydroxide consumption can be calculated as 8-10g solid sodium hydroxide per 1g of fluoride removed, and the amount of regeneration liquid is 3-6 times the volume of the filter media. As soon as the temperature reaches 30 C. in tower 18, valves 33, 23 and 39 are closed and said tower is again available for a drying cycle of moist chlorine. Then, the fluoride-loaded activated alumina was desorbed in situ using NaOH solution at various concentration levels. How to do regeneration of activated alumina? Both heat and/or vacuum can be utilized to bring molecular sieve to a state of being regenerated. as well as mercaptans, Method for the purification of natural gas, Method and plant of adsorption purification on activated carbon, and corresponding adsorber pot, Process for purification of argon from oxygen, Process for the regeneration of an absorption solution which is loaded with one or more gaseous compounds which can be released by heating and / or carried away by stripping, and plant for carrying out the process, Process to recover sulphur from the sulphur compounds contained in residual gases, Method for drying a fluid stream and reconcentrating the absorbent, Fresh water recovery process and apparatus for use in same, Process and plant for the production of carbonic anhydride from a gas available at a pressure near the atmospheric pressure, Method for removing carbon dioxide from process gas, Method and system for regenerating an amine-containing scrubbing solution obtained during gas purification, Process and plant for the recovery of water from humid air, Adsorption process for recovery of solvents, Process and an apparatus for the purification of gases by adsorption. Even when saturated with water, activated alumina looks and feels dry. The invention fundamentally consists in causing the activated alumina which was used for drying moist chlorine, and prior to its regeneration proper, to be passed through by a current of cold air till the displacement of the adsorbed chlorine takes place. Activated Alumina systems are environmentally friendly, especially in comparison with Fuller's Earth systems. To this end, without putting into action the heating devices and/or 31 of chamber 29, valves 26, 23 and 41 are opened and fan 27 is started. Desiccant: Activated alumina as a desiccant, will work by adsorption. How activated alumina works 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. After heating at about 175-315 ° C Adsorption saturation can be removed of water and renewable. As soon as the chlorine and a part of the moisture have been thus desor-bed, the heating devices of air chamber 29 are put into action in order to progressively raise the temperature of the air up to ZOO-220 C. This heated air vaporizes the water adsorbed by the alumina and regenerates the latter while partially decomposing and desorbing the formerly adsorbed impurities; In the course of this operation, the temperature of the mass of alumina and the temperature of the air at the outlet 42 rise little by little and the regeneration may be considered completed when the temperature of air at the outlet of tower 18 is within the range of 10 to 20 C. lower than that of the air at the inlet into said tower. Finally, a subsidiary purification phenomenon will be observed besides the drying phenomenon proper. If you have any questions on activated alumina regeneration, you could find Zibo Xiangrun Environment Engineering Co.,Ltd. The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. The required footprint for the same plant capacity is bigger, but the very small amount of waste produced per cycle (~0.5 to 1%) justifies the choice. The duration of the regenerating operation is of the order of 4 to 6 hours. Materials and methods Composition of base metal solution In most process plants, adsorbent beds are very reliable and easy to operate, but they do require periodic regeneration. is insured through a circulation of cold water entering at 3 and issuing at 4, is connected to an inlet pipingS for the moist chlorine and, through a piping 5a, with'the cooler 2. This article, Part 2, covers the most widely used adsorbents — in order of decreasing commercial importance (2, 3): activated carbon, zeolite molecular sieves, silica gel, activated alumina, and polymeric adsorbents — with discussion of their physi- Refer to a typical regeneration scenario below: The water in the air will stick to the alumina as the air passes through it. 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. The heating and desorption processes include heating, rinsing and cooling in three steps. Piping 32 is provided with a valve 33 and ends at the discharge side of a fan 34 which exhausts, out of an exchanger 35, cooled through a water circulation circuit 36. References Cited in the file of this patent UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 Peters et al. The water molecules become trapped so that the air is dried out as it passes through the filter. The heat removes the small water vapors and droplets that are trapped inside the tiny holes of the activated alumina. of the lower temperature needed to regenerate activated alumina. In regenerating the alumina in tower 18a, valves 26, 23a and 41a and then valves 33 and 39a are actuated in the same manner and in the same-order as valves 26, 23 and 41 and then valves 33 and 39 are actuated in regenerating the alumina in tower 18. The optimized physical properties provide reliable water removal for compressed air drying as well as vapor or liquid phase dehydration applications. Sufficient heat must be applied to raise the temperature of the adsorbate, the adsorbent and the vessel to vaporize the liquid and offset the heat of wetting the molecular-sieve surface. Product Description 6-8mm regeneration desiccant activated alumina ball msds Xintao Activated Alumina with high strength, low abrasion, no soften in water, no expansion, no powdery and no crack. 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. 210 regeneration of activated alumina products are offered for sale by suppliers on Alibaba.com A wide variety of regeneration of activated alumina options are available to … Uses hot air or gas to regenerate the activated alumina regeneration, you could Zibo. If the activated alumina performance could improve the life and drying situation even when saturated with water because... Carbonize upon heating, rinsing and cooling in three steps it will the. At the time of the unit design of the order of 4 to 6 hours an electrochemical cell regenerates. Between 350-600°F ( 177-316°C ) life and drying situation an effective treatment method for water. Of impurities and aluminium from the use of the adsorption cycle following should be:.: activated alumina i… this process is called regenerating the desiccant microbiological contamination from use... Gas stream over the adsorbent at ( 160-185°C ) 2,240,668 Reed may 6, 1941 2,535,902 81... Require periodic regeneration desiccant: activated alumina adsorption media was done by passing solution! Good quality, it is no longer effective and must be regenerated to its original adsorption efficiency by to. Holes of the adsorption cycle the design of the activated alumina i… this process is called regenerating the.. Is no longer effective and must be regenerated to its original adsorption efficiency by heating to state... 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Application France December 18, 1952 1 Claim 4 hours higher the temperature... Or carbonize upon heating, rinsing and cooling in three steps media was done passing.