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. 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. Thanks a lot for your attention. 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. 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. (Cl. breakthrough, regeneration, and column sizing. .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. Regeneration is a chemical procedure used for cleaning up the used activated alumina, so that it can be reused. 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 water molecules become trapped so that the air is dried out as it passes through the filter. 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. The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. If the activated alumina is good quality, it will improve the life of activated alumina. 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. We will explain it in our next news. 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. 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. 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 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 … 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 process used is based on the utilization of an electrochemical cell which regenerates several saturated adsorbent bed. 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. 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. Finally, a subsidiary purification phenomenon will be observed besides the drying phenomenon proper. Both heat and/or vacuum can be utilized to bring molecular sieve to a state of being regenerated. Aging. 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. 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, … The activated alumina could be used for 2 years or 1800 working hours. Desiccant: Activated alumina as a desiccant, will work by adsorption. Activated alumina is an excellent desiccant for drying a wide variety of liquids and gases. 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. Used with regeneration, activated alumina was the accepted best technology when compliance levels were less demanding. 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. In most process plants, adsorbent beds are very reliable and easy to operate, but they do require periodic regeneration. How activated alumina works 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? 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. of the lower temperature needed to regenerate activated alumina. 7. The heating and desorption processes include heating, rinsing and cooling in three steps. Certainly, whatever bad or good, you should use desiccant regeneration for future application. 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. 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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