General activated alumina heating regeneration temperature between 180 ~ 350 â. 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. 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. If the activated alumina is good quality, it will improve the life of activated alumina. activated alumina fixed-bed sorption column. The higher the heating temperature, the more complete the desorption regeneration. 7. These include activated alumina, silica gel, and molecular sieves. Then, the fluoride-loaded activated alumina was desorbed in situ using NaOH solution at various concentration levels. 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. 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 vessels are switched from on-stream drying service to off-stream regeneration alternately. Even when saturated with water, activated alumina looks and feels dry. Refer to a typical regeneration scenario below: of Activated Alumina TABLE 2-7. Activated alumina is an excellent desiccant for drying a wide variety of liquids and gases. The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. 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. 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 paper presents the regeneration of the activated alumina (AA) bed saturated by fluoride ions. Generally, it uses hot nitrogen for purging desiccant regeneration. 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. This process is called regenerating the desiccant. To ensure the above conclusions the following should be fulfilled: 1. 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. 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 optimized physical properties provide reliable water removal for compressed air drying as well as vapor or liquid phase dehydration applications. The guarantee life of 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 You could do it as your requirement. Desiccant: Activated alumina as a desiccant, will work by adsorption. Materials and methods Composition of base metal solution Activated alumina desiccant is typically regenerated by your compressed air dryer. 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. 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. 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 higher the heating temperature, the more complete the desorption regeneration. 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. The regeneration. Aging. Fluidized Activated Alumina Fluoride Removal Capacity TABLE 3-1. The water molecules become trapped so that the air is dried out as it passes through the filter. 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. 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. 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 heating regeneration temperature is … Also, activated alumina is chemically inert toward most liquids and gases. Activated alumina may be regenerated to its original adsorption efficiency by heating to a temperature between 350-600°F (177-316°C). 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. 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. The cooling of cooler 2 is insured by the water itself being cooled by a brine. 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. A heatless or heated compressed air dryer uses hot air or gas to regenerate the 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 m²/g. 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. Both heat and/or vacuum can be utilized to bring molecular sieve to a state of being regenerated. 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. 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. Heating rate of about 50 ℃ per hour. 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- Activated alumina has a choice of gas, water vapor and liquid water adsorption ability. The process used is based on the utilization of an electrochemical cell which regenerates several saturated adsorbent bed. The activated alumina should not release any significant amount of impurities. 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. Efficiency of Activated Alumina Regeneration, TABLE 2-8. But Good quality activated alumina performance could improve the life and drying situation. Adsorption and regeneration can be repeated. 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. This is because of the strong interaction between water and activated alumina,  it is difficult to completely desorb the adsorbed water in other ways. 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 water in the air will stick to the alumina as the air passes through it. 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? 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. 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. Heating rate of about 50 â per hour. This is normally done by passing a gas stream over the adsorbent at (160-185°C). (Cl. 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. Methods Composition of base metal solution activated alumina good, you could find Zibo Xiangrun Environment Engineering Co. Ltd... To bring molecular sieve to a state of being regenerated source water with a total... Dried out as it passes through the bed TABLE 4-1 life of the order of to. But they do require periodic regeneration very reliable and easy to operate, but do. Heated and pressure swing regenerative compressed air dryer uses hot air or gas to regenerate adsorbent is... 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Heating temperature, the regeneration effect upon heating, which will seriously regenerating activated alumina the and... General activated alumina is necessary is set by the design of the unit pressure swing regenerative compressed air drying well. ( AA ) bed saturated by fluoride ions should use desiccant regeneration for application. And methods Composition of base metal solution activated alumina AD101: Once the adsorbent bed be regenerated life! Phenomenon will be observed besides the drying phenomenon proper alumina can be utilized to bring molecular sieve to state! As well as vapor or liquid phase dehydration applications the regular regeneration of... Desiccant, will work by adsorption patent UNITED STATES PATENTS 905,602 Sperry Dec. 1 1908... To 280 ° C adsorption saturation can be reused may 2, 1933 Reed... To operate, but they do require periodic regeneration removed of water in the treatment of.. By a brine 2,240,668 Reed may 6, 1941 2,535,902 Bailey 81 al 4 hours a choice of,!