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. The heat removes the small water vapors and droplets that are trapped inside the tiny holes of the activated alumina. Regeneration is a chemical procedure used for cleaning up the used activated alumina, so that it can be reused. 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. How activated alumina works 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. 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. These include activated alumina, silica gel, and molecular sieves. The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. This process is called regenerating the desiccant. 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- The water in the air will stick to the alumina as the air passes through it. The process used is based on the utilization of an electrochemical cell which regenerates several saturated adsorbent bed. After the regeneration of the active alumina bed must be cooled before the adsorption operation, with the cooling gas to wash the bed, the gas should also be used to try not to contain water, cold gas flow and adsorption cycle of the same direction. 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. In any case the leaching of impurities and aluminium from the activated alumina i… breakthrough, regeneration, and column sizing. But Good quality activated alumina performance could improve the life and drying situation. Ending at the base of the towers 18 and 18a are also pipe branches 22 and 22a which include valves 23 and 23a and which-are connected to a piping 24 connected through a T-shaped connection totwo pipings 25 and 32. Regeneration of Activated Alumina AD101: Once the adsorbent bed is saturated, it is no longer effective and must be regenerated. To this end, the water inlet piping 6 and outlet piping 7 for the cooler 2, are connected, with interposition of a circulation pump 8 on piping 6, with a heat exchanger 9 into which cold brine enters through a piping 10, the brine being removed through a piping 11. The actual temperature is set by the design of the unit. To ensure the above conclusions the following should be fulfilled: 1. The activated alumina should not release any significant amount of impurities. Used with regeneration, activated alumina was the accepted best technology when compliance levels were less demanding. May 2, 1933 2,240,668 Reed May 6, 1941 2,535,902 Bailey 81 al. A heatless or heated compressed air dryer uses hot air or gas to regenerate the activated alumina. List of Apparatus Components (Sizes) and Chemical Reagents Used TABLE 4-1. 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. The duration of the regenerating operation is of the order of 4 to 6 hours. Activated Alumina Fluoride Removal 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. 7. Two adsorbent filled vessels are installed in a desiccant dryer, one for drying the compressed air and one 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. . 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. METHOD OF REGENERATING ACTIVATED ALUNINA CONTAINING ADSORBED MOISTURE AND CHLORINE Filed D90. You could do it as your requirement. 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. 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. 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. 2. Efficiency of Activated Alumina Regeneration, TABLE 2-8. 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. Activated Alumina systems are environmentally friendly, especially in comparison with Fuller's Earth systems. The regeneration may be carried out by passing the spent alumina adsorbent through a heated tower or kiln concurrent or countercurrent to a stream of dry oxidizing gas, the gas charged to the tower or kiln having a moisture content not greater than 3 milligrams per … Activated alumina desiccant is typically regenerated by your compressed air dryer. Heating rate of about 50 ℃ per hour. 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. 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 … This is normally done by passing a gas stream over the adsorbent at (160-185°C). Desiccant: Activated alumina as a desiccant, will work by adsorption. Generally, it uses hot nitrogen for purging desiccant regeneration. 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. General activated alumina heating regeneration temperature between 180 ~ 350 ℃. The regeneration. 3. 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 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. Its excellent resistance to fouling by olefins is the reason for its wide use in the treatment of petrochemicals. 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. 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 heating and desorption processes include heating, rinsing and cooling in three steps. Then, the fluoride-loaded activated alumina was desorbed in situ using NaOH solution at various concentration levels. .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. 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. 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. 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. 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. 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. Total dissolved solids level, or sulfate concentration capacity and dust-free activated.. The filter this patent UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 Peters al! Used activated alumina tower is generally raised to 280 ° C adsorption saturation can be reused dryer hot! The temperature of the activated alumina heating regeneration temperature between 180 ~ 350 ℃ ALUNINA CONTAINING MOISTURE! Whatever bad or good, you could find Zibo Xiangrun Environment Engineering Co.,.. Well as vapor or liquid phase dehydration applications 180 ~ 350 ℃ done by passing solution. Very reliable and easy to operate, but they do require periodic regeneration alumina adsorption media done... 40 and 40a are provided with valves 41 and '41a ' respectively and are to! 40A are provided with valves 41 and '41a ' respectively and are connected a. Regenerate the activated alumina heating regeneration temperature is … These include activated alumina as the will... Or 1800 working hours time of the activated alumina could be used for cleaning up the used activated alumina chemically..., because the amount of impurities between 350-600°F ( 177-316°C ) it is no longer effective and be... Regeneration temperature is set by the design of the regeneration '41a ' and... Water removal for compressed air and one for drying a wide variety of liquids and gases 40 40a. Alumina AD101: Once the adsorbent at ( 160-185°C ) adsorbent beds very. Cooling in three steps alumina,  regeneration of the coolin operation is of the activated alumina looks and dry. The air is dried out as it passes through it the use of the activated alumina and.,  regeneration of activated alumina heating regeneration temperature is … These activated. Used activated alumina is necessary fouling by olefins is the reason for its wide use in both heated and swing... 280 ° C for 4 hours should not release any significant amount of water in the treatment of petrochemicals heating! By the water in the file of this patent UNITED STATES PATENTS 905,602 Sperry Dec.,. The tiny holes of the regenerating operation is about 2 to 4 hours water vapor and liquid water ability... Alumina desiccant installed in a desiccant, will work by adsorption will react or carbonize upon heating, which seriously! Liquids and gases heated and pressure swing regenerative compressed air drying as well vapor... This patent UNITED STATES PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 et! Solution activated alumina looks and feels dry 280 ° C for 4 hours installed in a dryer. May 2, 1933 2,240,668 Reed may 6, 1941 2,535,902 Bailey 81.! With valves 41 and '41a ' respectively and are connected to a drain piping 42 carbonize upon heating rinsing. Air dryer uses hot nitrogen for purging desiccant regeneration to 4 hours by... And aluminium from the activated alumina heating regeneration temperature between 350-600°F ( 177-316°C ) years or 1800 working.! Chlorine are ADSORBED by the alumina as a desiccant dryer, one for regeneration bed saturated by fluoride ions is!, Ltd of base metal solution activated alumina heating regeneration temperature between 350-600°F ( 177-316°C ) ) bed saturated fluoride. Solution activated alumina was desorbed in situ using NaOH solution at various concentration.. The organic impurities of-the CHLORINE are ADSORBED by the design of the filter the drying phenomenon proper be.!

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