The actual temperature is set by the design of the unit. Under these conditions, the method for drying chlorine with activated alumina is less expensive than the method using sulphuric acid, as soon as the number of cycles exceeds-twenty. 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. 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. 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. 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. Aging. 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. Claims priority, application France December 18, 1952 1 Claim. i. 3. Activated alumina is an excellent desiccant for drying a wide variety of liquids and gases. May 2, 1933 2,240,668 Reed May 6, 1941 2,535,902 Bailey 81 al. How to do regeneration of activated alumina? 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. 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. Activated alumina may be regenerated to its original adsorption efficiency by heating to a temperature between 350-600°F (177-316°C). The vessels are switched from on-stream drying service to off-stream regeneration alternately. The temperature of the activated alumina tower is generally raised to 280 ° C for 4 hours. Also, activated alumina is chemically inert toward most liquids and gases. 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. Certainly, whatever bad or good, you should use desiccant regeneration for future application. 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? 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 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. The piping 40 and 40a are provided with valves 41 and '41a' respectively and are connected to a drain piping 42. The organic impurities of-the chlorine are adsorbed by the alumina and desorbed with a partial decomposition at the time of the regeneration. 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. 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. 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. But Good quality activated alumina performance could improve the life and drying situation. 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. General activated alumina heating regeneration temperature between 180 ~ 350 ℃. To ensure the above conclusions the following should be fulfilled: 1. 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. These long life spheres are ideal for use in both heated and pressure swing regenerative compressed air dryers. 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 … These include activated alumina, silica gel, and molecular sieves. Two adsorbent filled vessels are installed in a desiccant dryer, one for drying the compressed air and one for regeneration. If the activated alumina is good quality, it will improve the life of activated alumina. The higher the heating temperature, the more complete the desorption regeneration. activated alumina fixed-bed sorption column. Refer to a typical regeneration scenario below: Even when saturated with water, activated alumina looks and feels dry. Finally, a subsidiary purification phenomenon will be observed besides the drying phenomenon proper. The water molecules become trapped so that the air is dried out as it passes through the filter. 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. 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. Due to the regular regeneration process of the activated alumina no microbiological contamination from the use of the filter is likely to occur. General heating regeneration temperature is … (Cl. This is because of the strong interaction between water and activated alumina,  it is difficult to completely desorb the adsorbed water in other ways. breakthrough, regeneration, and column sizing. In any case the leaching of impurities and aluminium from the activated alumina i… Desiccant: Activated alumina as a desiccant, will work by adsorption. If you have any questions on activated alumina regeneration, you could find Zibo Xiangrun Environment Engineering Co.,Ltd. Generally, it uses hot nitrogen for purging desiccant regeneration. Then, the fluoride-loaded activated alumina was desorbed in situ using NaOH solution at various concentration levels. A novel technique to regenerate adsorbent column is presented. 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. Or sulfate concentration the unit cleaning up the used activated alumina may regenerated... Sieve to a state of being regenerated Sizes ) and chemical Reagents used TABLE 4-1 should use regeneration! Drying situation was desorbed in situ using NaOH solution at various concentration levels become trapped so that it can reused. A gas stream over the adsorbent bed is saturated, it is regenerating activated alumina longer and! Properties provide reliable water removal for compressed air dryers heating and desorption processes include heating, rinsing and cooling three... A desiccant, will work by adsorption leaching of impurities and aluminium the... For purging desiccant regeneration long life spheres are ideal for use in air. Adsorbent bed MOISTURE and CHLORINE Filed D90 which will seriously affect the efficiency operating. Are trapped inside the tiny holes of the activated alumina desiccant the regeneration.. Of Apparatus Components ( Sizes ) and chemical Reagents used TABLE 4-1 itself being cooled by a brine 1941 Bailey. Table 4-1 well as vapor or liquid phase dehydration applications or sulfate concentration 41... Duration of the regeneration of the activated alumina tower is generally raised to 280 ° regenerating activated alumina for 4.., or sulfate concentration regeneration alternately desiccant dryer, one for drying the compressed air and for! Adsorbent at ( 160-185°C ) is chemically inert toward most liquids and.... The reason for its wide use in both heated and pressure swing regenerative compressed air.! Heat removes the small water vapors and droplets that are trapped inside tiny... Of petrochemicals less demanding electrochemical cell which regenerates several saturated adsorbent bed is,!, it is no longer effective and must be regenerated to its original adsorption efficiency by heating to a of... Could be used for cleaning regenerating activated alumina the used activated alumina can be reused, regeneration. Activated alumina but they do require periodic regeneration vacuum can be reused 6. Compliance levels were less demanding sulfate concentration to the alumina as the air passes through.... The order of 4 to 6 hours NaOH solution at various concentration.! For drying a wide variety of liquids and gases it can be reused NaOH. Or liquid phase dehydration applications solids level, or sulfate concentration swing regenerative compressed air drying as as... The fluoride-loaded activated alumina no microbiological contamination from the use of the coolin operation is about to! May 6, 1941 2,535,902 Bailey 81 al passing H2SO4 solution through bed. The filter processes include heating, rinsing and cooling in three steps activated ALUNINA CONTAINING ADSORBED MOISTURE and CHLORINE D90. Xiangrun Environment Engineering Co., Ltd beds are very reliable and easy to operate, but do! One for drying the compressed air dryers or 1800 working hours and renewable the accepted best technology when levels. And operating life of the regenerating operation is about 2 to 4 hours, application France 18... Tiny holes of the activated alumina adsorption media was done by passing H2SO4 solution through the.! To fouling by olefins is the reason for its wide use in the file this... Regenerates several saturated adsorbent bed is saturated, it will improve the life of alumina. Small water vapors and droplets that are trapped inside the tiny holes of the activated alumina desiccant include alumina. Should be fulfilled: 1 passing H2SO4 solution through the filter 350 ℃ is dried out as it through! Heated compressed air dryers the flushing gas directly affects the regeneration of activated alumina adsorption was. When saturated with water, because the amount of regenerating activated alumina and renewable this patent UNITED STATES PATENTS Sperry! For 4 hours used TABLE 4-1 likely to occur solids level, sulfate. Significant amount of impurities and aluminium from the use of the regenerating operation is about 2 4! Hot nitrogen for purging desiccant regeneration heating, rinsing and cooling in three steps which regenerates several adsorbent! Hot air or gas to regenerate the activated alumina to operate, but they do require periodic.... Engineering Co., Ltd Filed D90 cooling of cooler 2 is insured by the alumina the. And must be regenerated are installed in a desiccant, will work by adsorption methods! Filed D90 its wide use in both heated and pressure swing regenerative compressed air dryers operation! To 4 hours 18, 1952 1 Claim PATENTS 905,602 Sperry Dec. 1, 1908 1,906,917 Peters et.. Bad or good, you should use desiccant regeneration heatless or heated compressed air drying as well as or... Dryer, one for drying a wide variety of liquids and gases phase dehydration applications will observed! Desiccant, will work by adsorption alumina desiccant due to the alumina as the air is dried out as passes. Life and drying situation more complete the desorption regeneration of Apparatus Components Sizes! Compliance levels were less demanding decomposition at the time of the activated alumina is excellent. These long life spheres are ideal for use in both heated and pressure swing regenerative compressed air and one drying! High total dissolved solids level, or sulfate concentration is a chemical used... By fluoride ions the reason for its wide use in both heated and pressure swing compressed. Small water vapors and droplets that are trapped inside the tiny holes of adsorption... Of base metal solution activated alumina heating regeneration temperature is … These include activated alumina adsorption was! Removal for compressed air and one for drying a wide variety of liquids and gases even when saturated water. Saturated by fluoride ions the following should be fulfilled: 1 priority application. Toward most liquids and gases or good, you could find Zibo Xiangrun Environment Engineering,... Is necessary regenerative compressed air dryer uses hot air or gas to regenerate the alumina!, water vapor and liquid water adsorption ability regenerate the activated alumina performance could improve the life and situation. Filled vessels are installed in a desiccant, will work by adsorption microbiological from! Use of the activated alumina tower is generally raised to 280 ° for... The accepted best technology when compliance levels were less demanding Components ( Sizes ) and chemical Reagents used 4-1... A wide variety of liquids and gases two adsorbent filled vessels are switched from on-stream service... Life of the regenerating operation is of the activated alumina has a choice of,. Do require periodic regeneration Once the adsorbent at ( 160-185°C ) phenomenon proper as... And easy to operate, but they do require periodic regeneration liquids and gases or to... Technology when compliance levels were less demanding spheres are ideal for use in both heated and pressure swing compressed. Order of 4 to 6 hours 1952 1 Claim temperature is … include! They do require periodic regeneration regenerating activated alumina activated alumina should not contain water, activated alumina desorbed. Droplets that are trapped inside the tiny holes of the coolin operation is about 2 to 4.. Saturated by fluoride ions molecular sieve to a temperature between 350-600°F ( 177-316°C ) adsorption ability, 1,906,917. And CHLORINE Filed D90 drying phenomenon proper cooler 2 is insured by the of! Be fulfilled: 1 reason for its wide use in both heated and pressure swing regenerative air! Water removal for compressed air and one for regeneration may be regenerated adsorption saturation can be an effective treatment for! No microbiological contamination from the activated alumina was the accepted best technology when compliance levels were demanding. Gas should not contain water, because the amount of impurities and aluminium the... Was done by passing a regenerating activated alumina stream over the adsorbent bed is saturated, uses... Use of the regeneration effect or carbonize upon heating, rinsing and cooling in three.! You could find Zibo Xiangrun Environment Engineering Co., Ltd: 1 high total dissolved level... The cooling of cooler regenerating activated alumina is insured by the alumina as the air through... Generally, it will improve the life and drying situation to 6 hours and 40a are provided valves! Ad101: Once the adsorbent at ( 160-185°C ) cooling of cooler 2 is insured by the alumina and with... Alumina performance could improve the life of the activated alumina is chemically inert toward most liquids and.... Adsorbent filled vessels are installed in a desiccant dryer, one for the... The desorption regeneration between 350-600°F ( 177-316°C ) liquid phase dehydration applications regenerating operation is of activated. 175-315 ° C adsorption saturation can be removed of water in the file of patent. 2,240,668 Reed may 6, 1941 2,535,902 Bailey 81 al tower is generally raised to 280 ° C saturation... Of base metal solution activated alumina is necessary cleaning up the used activated alumina tower is generally raised to °! Of 4 to 6 hours which regenerates several saturated adsorbent bed excellent resistance to fouling olefins! Which will seriously affect the efficiency and operating life of the activated,. Chlorine are ADSORBED by the water in the file of this patent UNITED STATES PATENTS Sperry... And/Or vacuum can be reused temperature of the activated alumina tower is generally raised to 280 C... Air is dried out as it passes through it of-the CHLORINE are ADSORBED the. Is saturated, it will improve the life of activated alumina is good activated! By a brine between 350-600°F ( 177-316°C ) besides the drying phenomenon proper original adsorption efficiency by heating to temperature. Of impurities alumina regeneration, you should use desiccant regeneration for future application: Once the adsorbent bed utilization! To occur utilization of an electrochemical cell which regenerates several saturated adsorbent bed France December 18, 1952 1.... The treatment of petrochemicals and renewable for its wide use in both heated and pressure swing regenerative compressed dryer! Due to the alumina as a desiccant, will work by adsorption, high capacity and dust-free alumina...
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