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•
18 Feb 2016TL;DR: In this article, a process to dry 1-chloro-3,3, 3,3-trifluoropropene (HCFO-1233zd) or its mixtures by washing with water and or alkaline solution is described.
Abstract: Disclosed is a process to dry 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd) or its mixtures by washing with water and or alkaline solution. The resulting liquid mixture, containing HCFO-1233zd, other organic, and water, is allowed to settle, and thereafter, the lighter water layer is decanted off from the top of the mixture. The heavier HCFO-1233zd layer is then withdrawn from the bottom of the decanter to a desiccant dryer (e.g., molecular sieve, activated alumina, silica gel, and the like) to further remove the residual soluble moisture from the HCFO-1233zd to about 80 ppm or less.
12 citations
Patent•
05 Jun 1984
TL;DR: In this paper, a process for hydrotreating hydrocarbons uses a catalyst which comprises a carrier and at least one catalytic metal selected from vanadium, molybdenum, tungsten, nickel, cobalt and/or iron; this catalyst is in the form of a plurality of juxtaposed agglomerates of acicular platelets, oriented radially to each other.
Abstract: A process for hydrotreating hydrocarbons uses a catalyst which comprises a carrier and at least one catalytic metal selected from vanadium, molybdenum, tungsten, nickel, cobalt and/or iron; this catalyst is in the form of a plurality of juxtaposed agglomerates of acicular platelets, oriented radially to each other. It is prepared from agglomerates of activated alumina subjected to reaction with an acid and a compound providing an anion able to combine with aluminum ions in solution.
12 citations
TL;DR: In this article, the surface water on concrete materials consists of physically adsorbed water, chemically adorned water, and structural water as in the case of porous adsorption materials, and it is shown that concrete is easily contaminated with tritiated water.
Abstract: The concrete materials are used as the partition wall of the tritium handling facilities. It is important to grasp the tritium behavior in the concrete wall for radiation safety. It is considered in this study that the surface water on the concrete materials consists of physically adsorbed water, chemically adsorbed water and structural water as in the case of porous adsorption materials. The adsorption capacity due to physically and chemically adsorption isotherms observed in this study shows that the amount of water adsorption on the cement paste is a quarter of the amount adsorbed onto the surface of activated alumina or molecular sieves 5A (MS-5A). It shows that concrete is easily contaminated with tritiated water.
12 citations
TL;DR: In this article, a binary surface excess isotherms, liquid-phase adsorption kinetics and column dynamics for the adaption of bulk water-ethanol mixtures on Alcoa H152 alumina was investigated.
Abstract: Separation of ethanol-water liquid mixtures can be carried out by selective adsorption of water on activated alumina. The moderate selectivity and heat of adsorption of water on the alumina permits easier and less energy intensive desorption of the adsorbed water. Experimental binary surface excess isotherms, liquid-phase adsorption kinetics and column dynamics for the adsorption of bulk water-ethanol mixtures on Alcoa H152 alumina reported. Model analyses of the data are carried out to quantify the selectivity of adsorption, adsorptive mass-transfer coefficients and the properties of the mass-transfer zones in adsorption columns.
12 citations
Patent•
12 Aug 1991
TL;DR: In this paper, a method for purifying an exhaust gas containing catalyst poison(s) by subjecting the gas to a catalytic treatment which comprises previously passing the gas through a layer packed with a highly activated alumina to remove the catalyst poison (s); and an apparatus for Purifying exhaust gas consisting of catalytic poison (catalyst poison).
Abstract: A method for purifying an exhaust gas containing catalyst poison(s) by subjecting the gas to a catalytic treatment which comprises previously passing the gas through a layer packed with a highly activated alumina to remove the catalyst poison(s); and an apparatus for purifying exhaust gas containing catalyst poison(s) by subjecting the gas to a catalytic treatment, wherein a layer packed with a highly activated alumina for removal of the catalyst poison(s) and a layer packed with an oxidation catalyst for removal of harmful substances in the gas are separately arranged.
12 citations