Topic
Activated alumina
About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.
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18 Mar 2010
TL;DR: In this article, a method for eliminating an iodine mixture from an aqueous solution is provided to effectively remove the iodine without a separate oxidation or reduction reaction process for making the iodine mixture into a single ion state and to completely eliminate the iodine from radioactive waste liquid.
Abstract: PURPOSE: A method for eliminating an iodine mixture from an aqueous solution is provided to effectively remove the iodine without a separate oxidation or reduction reaction process for making the iodine mixture into a single ion state and to completely eliminate the iodine from radioactive waste liquid. CONSTITUTION: A method for eliminating an iodine mixture from an aqueous solution includes a step of adsorbing a mixture selected from iodide ion(I^-), iodate ion(IO3^-) and iodine using an adsorbate selected from activated alumina, the activated alumina in which Ag are dipped, and activated charcoal. The method comprises the following steps: a step of absorbing the iodate ion from acidic activated alumina and the acidic activated alumina in which Ag are dipped; step of absorbing the iodide ion selected from basic activated alumina and the basic activated alumina in which Ag are dipped; and a step of absorbing the iodine using the activated charcoal.
3 citations
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10 Dec 2003
TL;DR: In this paper, a process for synthesizing 3-methylanisole through gas phase synthesizing, wherein the catalyst employs activated charcoal or molecular sieve or activated alumina, and the preparation process comprises the steps of, preparing the disposed substance in solution of certain concentration, charging catalyst when stirring, dipping, drying and forming.
Abstract: The invention provides a process for synthesizing 3-methylanisole through gas phase synthesizing, wherein the catalyst employs activated charcoal or molecular sieve or activated alumina, preferably the catalyst through solution treating of the alkaline metal or the alkaline earth fluoride or hydroxide compound The preparation process comprises the steps of, preparing the disposed substance in solution of certain concentration, charging catalyst when stirring, dipping, drying and forming The invention can realize high yield and selectivity for p-methylanisole
3 citations
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01 Jan 1972
TL;DR: In this paper, the effects of water composition as they apply to the design of activated alumina and virgin and regenerated bone char defluoridation units were studied. And the results showed that ionic strength, divalent metal ions, arsenic, and pH connected to buffering capacity have significant effects.
Abstract: The effects of water composition as they apply to the design of virgin and regenerated activated alumina and virgin and regenerated bone char defluoridation units were studied. Freundlich isotherm analysis was used to determine the degree of the effect compared to an arbitrary standard. The results showed that ionic strength, divalent metal ions, arsenic, and pH connected to buffering capacity have significant effects. The anions sulfate, nitrate, and chloride showed negligible effect on the removal of fluoride.
3 citations
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TL;DR: In this paper, a column packed with activated alumina was used to remove trace impurities of iron, copper, silver and lead from zinc, cadmium, manganese, magnesium, calcium, strontium and barium salts.
Abstract: Solutions of zinc, cadmium, manganese, magnesium, calcium, strontium and barium salts and of ammonium and sodium tungstates have been freed from trace impurities of iron, copper, silver and lead by one passage through a column packed with activated alumina. In most cases, the contamination in the resulting solutions is below the limits of polarographic or photometric analysis.
3 citations
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31 Mar 1954
TL;DR: In this article, a mixture of propylene and molecular oxygen-containing gases at elevated temperatures in the presence of elementary selenium in the reaction zone successively over a contact material comprising copper oxide distributed on activated alumina which has been given a preliminary heat treatment at temperatures above 950 DEG C.
Abstract: Acrolein is manufactured by a process which comprises passing a mixture of propylene and molecular oxygen-containing gases at elevated temperatures in the presence of elementary selenium in the reaction zone successively over a contact material comprising copper oxide distributed on activated alumina which has been given a preliminary heat treatment at temperatures above 950 DEG C. and a contact material comprising copper oxide distributed on activated alumina which has been given a preliminary heat treatment between 800 DEG and 900 DEG C. The less active and more active contact materials may be arranged in one reactor tube or separately in two reactor tubes in series. The proportion of olefine employed in the reaction mixture is preferably less than that which corresponds to the lower explosion limit. Air may be employed for the oxidation or oxygen with inert diluents such as steam or carbon dioxide may be used. Comparative tests are carried out, one using a uniform contact material and the other using two contact materials in p accordance with the invention. In an example, activated alumina granules are impregnated with copper oxide by immersion in aqueous copper nitrate, drying and heating. One part is heat-treated at 850 DEG C. and the other at 1000 DEG C. and a propylene-air mixture with selenium is passed over the heated contact materials arranged in series with the less active material first. Specifications 625,330 and 655,210 are referred to.
3 citations