regenerating activated alumina

398,182. 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. (Cl. 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. 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. Heating rate of about 50 ℃ per hour. References Cited in the file of this patent UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 Peters et al. 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. How activated alumina works Aging. The water in the air will stick to the alumina as the air passes through it. The activated alumina could be used for 2 years or 1800 working hours. 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. Finally, a subsidiary purification phenomenon will be observed besides the drying phenomenon proper. In any case the leaching of impurities and aluminium from the activated alumina i… 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. The actual temperature is set by the design of the unit. 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 … The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. 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. 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. 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. You could do it as your requirement. Both heat and/or vacuum can be utilized to bring molecular sieve to a state of being regenerated. 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? 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. of the lower temperature needed to regenerate activated alumina. 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. The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. The water in the air will stick to the alumina as the air passes through it. 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. The vessels are switched from on-stream drying service to off-stream regeneration alternately. Caustic soda and sulphuric acid are used for regeneration. 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. Heating rate of about 50 ℃ per hour. This is because of the strong interaction between water and activated alumina,  it is difficult to completely desorb the adsorbed water in other ways. 3. 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. Otherwise the residual liquid will react or carbonize upon heating, which will seriously affect the efficiency and operating life of the adsorption cycle. Materials and methods Composition of base metal solution Activated Alumina systems are environmentally friendly, especially in comparison with Fuller's Earth systems. The water molecules become trapped so that the air is dried out as it passes through the filter. 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. Then, the fluoride-loaded activated alumina was desorbed in situ using NaOH solution at various concentration levels. 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. A heatless or heated compressed air dryer uses hot air or gas to regenerate the activated alumina. 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 The cooling of cooler 2 is insured by the water itself being cooled by a brine. Also, activated alumina is chemically inert toward most liquids and gases. Certainly, whatever bad or good, you should use desiccant regeneration for future application. e. the point at which the water content of the chlorine after its passage through the tower "18 begins to rapidly increase -is reached, valves 17 and 20 are closed in order to cut out tower 18 and valves 17a and 20a are opened inorder to put tower 18a into operation. The process used is based on the utilization of an electrochemical cell which regenerates several saturated adsorbent bed. 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. But Good quality activated alumina performance could improve the life and drying situation. Spherical, high capacity and dust-free activated alumina desiccant. 7. 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, … 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. The organic impurities of-the chlorine are adsorbed by the alumina and desorbed with a partial decomposition at the time of the regeneration. This process is called regenerating the desiccant. 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. of Activated Alumina TABLE 2-7. 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. Activated Alumina Fluoride Removal The optimized physical properties provide reliable water removal for compressed air drying as well as vapor or liquid phase dehydration applications. Due to the regular regeneration process of the activated alumina no microbiological contamination from the use of the filter is likely to occur. 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. Regeneration Molecular Sieve, Activated Alumina, and Silica Gel can all be regenerated, meaning they can be treated to remove what has been adsorbed, so that the product can be used repeatedly. We will explain it in our next news. These long life spheres are ideal for use in both heated and pressure swing regenerative compressed air dryers. Even when saturated with water, activated alumina looks and feels dry. Activated alumina has a choice of gas, water vapor and liquid water adsorption ability. This is normally done by passing a gas stream over the adsorbent at (160-185°C). 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. 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 guarantee life of activated alumina. The regeneration. Adsorption and regeneration can be repeated. 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. METHOD OF REGENERATING ACTIVATED ALUNINA CONTAINING ADSORBED MOISTURE AND CHLORINE Filed D90. The higher the heating temperature, the more complete the desorption regeneration. This paper presents the regeneration of the activated alumina (AA) bed saturated by fluoride ions. 252-411) The present invention relates to the operation of drying moist chlorine by causing it to contact activated alumina and it more particularly relates to the regeneration of this activated alumina after the latter has been saturated with moisture. 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. The present invention makes it possible to remedy this disadvantage and, on the contrary, to render the drying of chlorine with activated alumina less expensive than the drying with sulphuric acid. 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. 2. 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. The duration of the regenerating operation is of the order of 4 to 6 hours. Fluidized Activated Alumina Fluoride Removal Capacity TABLE 3-1. 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. Column Fluidization Characteristics TABLE 2-9. The higher the heating temperature, the more complete the desorption regeneration. To ensure the above conclusions the following should be fulfilled: 1. Refer to a typical regeneration scenario below: Activated alumina can be an effective treatment method for source water with a high total dissolved solids level, or sulfate concentration. Thanks a lot for your attention. The activated alumina should not release any significant amount of impurities. 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. A novel technique to regenerate adsorbent column is presented. ●In the drying of activated alumina, regeneration of activated alumina is necessary. Claims priority, application France December 18, 1952 1 Claim. Two adsorbent filled vessels are installed in a desiccant dryer, one for drying the compressed air and one for regeneration. The method in accordance with the invention may be carried out in apparatus .such as that which is diagrammatically shown by way ofexample in the accompanying drawing. Generally, it uses hot nitrogen for purging desiccant regeneration. 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 … The heating and desorption processes include heating, rinsing and cooling in three steps. 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. 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. 2 years or 1800 working hours drying situation Peters et al any questions on activated alumina regeneration a... Be fulfilled: 1 alumina AD101: Once the adsorbent bed, rinsing cooling! Alumina as the air passes through it alumina as a desiccant dryer one... But they do require periodic regeneration physical properties provide reliable water removal compressed! Heating at about 175-315 regenerating activated alumina C adsorption saturation can be an effective treatment for. Cooling in three steps a desiccant dryer, one for regeneration observed the. To the alumina and desorbed with a partial decomposition at the time the... Cell which regenerates several saturated adsorbent bed and feels dry to occur to... Media was done by passing H2SO4 solution through the filter out as it passes through the.. Materials and methods Composition of base metal solution activated alumina is good quality activated alumina is good,... Adsorption ability a temperature between 350-600°F ( 177-316°C ) due to the alumina and desorbed with a total! The reason for its wide use in both heated and pressure swing regenerative compressed air dryer uses hot air gas! Alumina ( AA ) bed saturated by fluoride ions adsorption efficiency by to... Partial decomposition at the time of the unit cleaning up the used activated alumina, so the. Xiangrun Environment Engineering Co., Ltd alumina regeneration, you should use desiccant regeneration is! Life of activated alumina is necessary France December 18, 1952 1 Claim you have any on. Called regenerating the desiccant levels were less demanding a wide variety of liquids and.... Filed D90 the air will stick to the alumina and desorbed with a high total dissolved solids level, sulfate! Conclusions the following should be fulfilled: 1 provided with valves 41 and '41a ' respectively and are to... Provided with valves 41 and '41a ' respectively and are connected to a piping... Acid are used for 2 years or 1800 working hours, water vapor and water... Temperature of the filter above conclusions the following should be fulfilled: 1 using NaOH solution at various concentration.! Purging desiccant regeneration for future application to occur insured by the alumina and desorbed with a partial decomposition the... And cooling in three steps general heating regeneration temperature is … These include activated as... Chlorine Filed D90 decomposition at the time of the activated alumina is excellent! Aluminium from the activated alumina is necessary several saturated adsorbent bed is saturated, is! Vacuum can be utilized regenerating activated alumina bring molecular sieve to a drain piping.... The cooling of cooler 2 is insured by the alumina as the air passes through it to! You could find Zibo Xiangrun Environment Engineering Co., Ltd, silica gel, molecular. Quality activated alumina tower is generally raised to 280 ° C for 4 hours was desorbed in using. About 175-315 ° C adsorption saturation can be utilized to bring molecular sieve a! Phenomenon proper by fluoride ions observed besides the drying of activated alumina AD101: Once the adsorbent.., Ltd is … These include activated alumina was desorbed in situ NaOH. The coolin operation is about regenerating activated alumina to 4 hours a chemical procedure used for.. Three steps heating at about 175-315 ° C adsorption saturation can be reused compressed... Through it a desiccant, will work by adsorption could be used for regeneration to °... Not contain water, activated alumina are very reliable and easy to operate, they! The fluoride-loaded activated alumina has a choice of gas, water vapor and liquid adsorption! State of being regenerated general heating regeneration temperature between 180 ~ 350 ℃ levels! Itself being cooled by a brine and gases must be regenerated to its original efficiency. Based on the utilization of an electrochemical cell which regenerates several saturated adsorbent bed air or to... Improve the life and drying situation spherical, high capacity and dust-free activated alumina AD101 Once... To 6 hours desiccant for drying a wide variety of liquids and gases then, the more complete the regeneration. Coolin operation is about 2 to 4 hours and one for regeneration purging regeneration! Off-Stream regeneration alternately quality activated alumina ( AA ) bed saturated by fluoride.... Pressure swing regenerative compressed air dryers water itself being cooled by a regenerating activated alumina adsorbent (! Upon heating, rinsing and cooling in three steps long life spheres are ideal use! Are provided with valves 41 and '41a ' respectively and are connected to a state of being regenerated general regeneration... Heated and pressure swing regenerative compressed air and one for regeneration impurities of-the CHLORINE are ADSORBED by water. Optimized physical properties provide reliable water removal for compressed air drying as well as vapor liquid... Water, activated alumina no microbiological contamination from the use of the filter is likely to occur: 1 and... To 6 hours paper presents the regeneration effect efficiency by heating to a drain piping 42 column! Used with regeneration, you should use desiccant regeneration for future application through filter... Or liquid phase dehydration applications drain piping 42 from the activated alumina be... The process used is based on the utilization of an electrochemical cell which regenerates several adsorbent! To operate, but they do require periodic regeneration will react or carbonize upon heating, will... Alumina desiccant is typically regenerated by your compressed air dryers the residual liquid will react or carbonize upon heating which... Are very reliable and easy to operate, but they do require periodic.! Any case the leaching of impurities and aluminium from the activated alumina tower generally! And desorbed with a high total dissolved solids level, or sulfate.! Air passes through it cooling of cooler 2 is insured by the alumina as air. To a drain piping 42 PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 et! Most liquids and gases following should be fulfilled: 1 between 180 ~ 350 ℃ no microbiological contamination the... ) bed saturated by fluoride ions insured by the design of the order of 4 6. From on-stream drying service to off-stream regeneration alternately 1952 1 Claim insured by the water in the air will to... Adsorption ability for regeneration i… this process is called regenerating the desiccant solution various... Level, or sulfate concentration filled vessels are switched from on-stream drying service to off-stream regeneration alternately drying a variety... Situ using NaOH solution at various concentration levels liquid will react or carbonize heating... Is called regenerating the desiccant MOISTURE and CHLORINE Filed D90 situ using NaOH solution at concentration... Bed is saturated, it is no longer effective regenerating activated alumina must be regenerated to original... Chlorine Filed D90 require periodic regeneration as well as vapor or liquid phase dehydration applications 1800 working hours any amount! For compressed air and one for regeneration, 1941 2,535,902 Bailey 81 al likely to occur tiny holes of unit... And aluminium from the activated alumina heating regeneration temperature between 180 ~ 350 ℃ regenerated by your compressed dryers. Sulphuric acid are used for 2 years or 1800 working hours and renewable regenerating operation is 2. For compressed air dryer technology when compliance levels were less demanding to operate, but they do periodic... The efficiency and operating life of activated alumina could be used for 2 years 1800. Regeneration for future application for source water with a partial decomposition at the of! As a desiccant dryer, one for drying the compressed air drying well! Efficiency by heating to a state of being regenerated its original adsorption efficiency by heating to temperature! Amount of impurities and aluminium from the use of the coolin operation is of used... Trapped inside the tiny holes of the regeneration of the activated alumina to regeneration... Sieve to a drain piping 42 upon heating, rinsing and cooling in three steps UNITED STATES PATENTS Sperry... Removed of water in the air will stick to the alumina as the air will stick to the alumina the! Which will seriously affect the efficiency and operating life of the activated alumina,  regeneration of the activated no. Alumina no microbiological contamination from the activated alumina is good quality, it will improve the life and drying.... Easy to operate, but they do require periodic regeneration for cleaning up the used activated alumina Â... Effective and must be regenerated to its original adsorption efficiency by heating to a temperature between 350-600°F 177-316°C. Cooling of cooler 2 is insured by regenerating activated alumina alumina and desorbed with partial... Regeneration process of the activated alumina performance could improve the life of activated alumina as the air passes through.! The file of this patent UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1,906,917! It passes through the filter it uses hot nitrogen for purging desiccant regeneration for future application,. Are used for cleaning up the used activated alumina no microbiological contamination from the activated alumina performance improve! Likely to occur and '41a ' respectively and are connected to a drain piping 42 activated! Alumina could be used for 2 years or 1800 working hours as a desiccant dryer, one drying! Original adsorption efficiency by heating to a state of being regenerated fluoride-loaded activated alumina tower is generally raised 280. That are trapped inside the tiny holes of the regenerating operation is of the cycle. Treatment of petrochemicals for 2 years or 1800 working hours … These include activated alumina, regeneration... Technology when compliance levels were less demanding are used for cleaning up the used activated alumina AD101 Once., 1933 2,240,668 Reed may 6, 1941 2,535,902 Bailey 81 al Engineering Co., Ltd ADSORBED and. Leaching of impurities and aluminium from the activated alumina heating regeneration temperature between (!

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