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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Patent•
02 Aug 1939
TL;DR: In this paper, the art of reducing the humidity of gaseous and vaporous admixtures has been studied and improvements in method and means of utilizing known solid adsorbents of the nature of activated alumina, activated carbon, silica gel, and the like, for removing...
Abstract: The present invention relates to the art of reducing the humidity of gaseous and vaporous admixtures and is primarily directed to improvements in method and means of utilizing known solid adsorbents of the nature of activated alumina, activated carbon, silica gel, and the like, for removing...
9 citations
Journal Article•
9 citations
Patent•
25 Jan 1977
TL;DR: In this paper, a process for preparing fluorine-rich organic compounds containing one or two carbon atoms from organic fluoro compounds of lower fluorine content was proposed, in which starting partially or completely halogenated fluoro carbon compounds having at least one halogen atom other than fluorine, e.g., CHCl 2 F, CHClF 2, CCl 2F 2, CCl 3 F, CCL 3F, C 2 Cl 3 F 3, C2 Cl 3F 3,C 2 Cl 2F 4 and C 2Cl 4 F 2
Abstract: A process for preparing fluorine-rich organic compounds containing one or two carbon atoms from organic fluoro compounds of lower fluorine content in which starting partially or completely halogenated fluoro carbon compounds having at least one halogen atom other than fluorine, e.g., CHCl 2 F, CHClF 2 , CCl 2 F 2 , CCl 3 F, C 2 Cl 3 F 3 , C 2 Cl 2 F 4 and C 2 Cl 4 F 2 , are contacted under disproportionation conditions with a catalyst system of a specific type which comprises 0.1 - 5% by weight, as metal, of a nickel(II) halide, titanium(III) chloride or titanium(III) fluoride and a balance of an aluminum compound such as activated alumina, silica, alumina or aluminum fluoride.
9 citations
TL;DR: In this paper, a mixture of saturated and unsaturated hydrocarbons has been successfully separated on a single gas-solid chromatographic (GSC) column of activated alumina, which is remarkable when the extreme boiling point range (−88.3° to +125.8° C) of the respective components is considered.
Abstract: A MULTICOMPONENT mixture of saturated and unsaturated hydrocarbons has been successfully separated on a single gas–solid chromatographic (GSC) column of activated alumina. This separation is remarkable when the extreme boiling-point range (−88.3° to +125.8° C) of the respective components is considered.
9 citations
Journal Article•
TL;DR: In this article, the effect of activated alumina in reducing the fluoride concentration in drinking water was investigated and the results showed that with increasing of pH of solution, removal efficiency was decreased and optimum pH was found to be in the range of 5 to 7.
Abstract: Backgrounds and Objectives: Determination of Fluoride in drinking water has received increasing interest, duo to its beneifical and detrimental effects on health. The aim of this research is investigation of Effect of activated alumina in fluoride concentration reduction in drinking water. Materials and Methods: Expriment in batch system and with change effective parameters such as pH(5, 7,9), equilibration time (30, 60, 90, 120 minute), initial fluoride concentration(1.4, 2, 2.4 mg/l) and activated Alumina dosage (0.1, 0.2, 0.3 gr/l) was investigated. Also found data of this research were fited with Langmuir and Freundlich models, kinetic data with pseudofirst order, pseudosecond order and modifited pseudofirst order models. Results: The results showed that with increasing of pH of solution, removal efficiency was decreased and optimum pH was found to be in the range of 5 to 7. Also removal efficiency of fluoride was increased with increasing of adsorbent dosage and decreasing of initial concentration of fluoride. Adsorption isotherm data show that the fluoride sorption followed the Langmuir model (r2=0.98). Kinetics of sorption of fluoride onto Activated alumina was well described by pseudosecond order model. Conclusion: The concentration of Activated Alumina had significant effect on the reduction of fluoride ions concentration in water.The higher fluoride removals were observed for batch experiments at pH=5 because no free fluoride ion is present in the solutions, and it could be casued by electrostatic interactions between the surface of alumina and the dominant fluoride species in solution The kinetic model can adequately describe the removal behaviors of fluoride ion by alumina adsorption in the batch system. Key word: Activated Alumina, Fluoride, Water, Adsorption *Corresponding Author: dr.norozi@yahoo.com Tel: +98 171 4421651 Fax: +98 171 4423630 Iran. J. Health & Environ., 2009, Vol. 2, N0. 3 D ow nl oa de d fr om ij he .tu m s. ac .ir a t 7 :2 8 IR D T o n S un da y M ay 2 nd 2 02 1
9 citations