Showing papers on "Activated alumina published in 1976"
Patent•
15 Jan 1976TL;DR: In this article, the Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sqm/g and is composed of activated alumina and a compound of a metal of column III A of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst.
Abstract: Catalysts for Claus reaction treatment of industrial gases containing hydrogen sulphide and sulphur dioxide in which the catalyst has a specific surface area of at least 80 sqm/g and is composed of activated alumina and a compound of a metal of column III A of the periodic classification of elements which is present, when calculated as the oxide, in an amount within the range of 1-20% by weight of the catalyst
23 citations
Patent•
03 Feb 1976
TL;DR: In this paper, a process for the preparation of alumina-containing particles, comprising the steps of (a) mixing an aluminum oxide hydrosol containing a hydrate of activated alumina and an additive component selected from a high molecular weight natural organic material which is insoluble in aqueous solution up to a temperature of 50° C.
Abstract: Disclosed is process for the preparation of alumina-containing particles, comprising the steps of (a) mixing an aluminum oxide hydrosol containing a hydrate of alumina or activated alumina and an additive component selected from a high molecular weight natural organic material which is insoluble in aqueous solution up to a temperature of 50° C. and carbon with a solution of hydrolyzable base to form a mixture; (b) introducing the mixture in dispersed form into a water-immiscible liquid having a temperature of from about 60 to 100° C., whereby gel particles are formed; (c) aging the gel particles in the liquid at the temperature and subsequently in an aqueous ammonia solution; (d) recovering the aged particles; and (e) calcining the recovered particles.
22 citations
Patent•
12 Aug 1976TL;DR: In this paper, a process for the purification of a byproduct hydrogen chloride stream containing fluoride impurities including carbonyl fluorides comprising activated alumina maintained at a temperature of at least 55° C.
Abstract: A process is disclosed for the purification of a by-product hydrogen chloride stream containing fluoride impurities including carbonyl fluorides comprising contacting said stream with activated alumina maintained at a temperature of at least 55° C. to adsorb said impurities.
12 citations
Patent•
06 Dec 1976TL;DR: Ferric chloride is removed from gas streams containing the same by passing the stream through a bed of activated alumina impregnated with potassium chloride or sodium chloride as mentioned in this paper, which is known as activated aluminates.
Abstract: Ferric chloride is removed from gas streams containing the same by passing the stream through a bed of activated alumina impregnated with potassium chloride or sodium chloride.
9 citations
Patent•
12 Oct 1976TL;DR: In this paper, a process for desulphurizing gases containing SO 2 and SO 3 by absorption of the sulphur containing compounds by means of absorbents based on alumina free of alkaline substances, activated alumina or alumina carrying salts or oxides of at least one element selected from the groups IB, IIB, IVB, VB, VIIB, VIIB, VIII of the Periodic Classification, the absorption takes place at temperatures comprised between 100° and 400° C.
Abstract: In a process for desulphurizing gases containing SO 2 and SO 3 by absorption of the sulphur containing compounds by means of absorbents based on alumina free of alkaline substances, activated alumina or alumina carrying salts or oxides of at least one element selected from the groups IB, IIB, IVB, VB, VIB, VIIB, VIII of the Periodic Classification, the absorption takes place at temperatures comprised between 100° and 400° C., and the absorbent loaded with said compounds in the form of sulphates is heated with a gas containing a reducing gas, especially H 2 S, to a temperature of 250° C. to 450° C., while the elementary sulphur thus formed is separated from said absorbent, whereafter the latter is re-used in a subsequent absorption operation.
8 citations
Patent•
28 Jan 1976
TL;DR: In this article, an activated type alumina from aluminum dross by digestion with water, preferably pressurized, is described, where the peculiar properties associated with trace compounds present in the product make it useful for the recovery of noxious effluents from furnacing processes, including those burning fossil fuels and those used for smelting both aluminum and steel.
Abstract: Production of an activated type alumina from aluminum dross by digestion with water, preferably pressurized. The peculiar properties associated with trace compounds present in the product make it useful for the recovery of noxious effluents from furnacing processes, including those burning fossil fuels and those used for smelting both aluminum and steel, wherein the alumina beneficially incorporates in the metallurgical flux.
7 citations
Patent•
28 Jan 1976
TL;DR: In this paper, an activated type alumina from aluminum dross by digestion with water, preferably pressurized, is described, where the peculiar properties associated with trace compounds present in the product make it useful for the recovery of noxious effluents from furnacing processes, including those burning fossil fuels and those used for smelting both aluminum and steel.
Abstract: Production of an activated type alumina from aluminum dross by digestion with water, preferably pressurized. The peculiar properties associated with trace compounds present in the product make it useful for the recovery of noxious effluents from furnacing processes, including those burning fossil fuels and those used for smelting both aluminum and steel, wherein the alumina beneficially incorporates in the metallurgical flux.
6 citations
Patent•
28 Jan 1976
TL;DR: In this paper, an activated type alumina from aluminum dross by digestion with water, preferably pressurized, is described, where the peculiar properties associated with trace compounds present in the product make it useful for the recovery of noxious effluents from furnacing processes, including those burning fossil fuels and those used for smelting both aluminum and steel.
Abstract: Production of an activated type alumina from aluminum dross by digestion with water, preferably pressurized. The peculiar properties associated with trace compounds present in the product make it useful for the recovery of noxious effluents from furnacing processes, including those burning fossil fuels and those used for smelting both aluminum and steel, wherein the alumina beneficially incorporates in the metallurgical flux.
4 citations
Patent•
26 Oct 1976
TL;DR: In this article, the authors used activated alumina to reduce NOx to harmless nitrogen efficiently without poisoning by SOx, which is obtained by supporting Ti, V, etc. on the surface of activated aluminina.
Abstract: PURPOSE:Catalyst of excellent durability which is obtained by supporting Ti, V, etc. on the surface of activated alumina and can be used to reduce NOx to harmless nitrogen efficiently without poisoning by SOx.
3 citations
Patent•
24 Aug 1976
TL;DR: In this paper, a method of removing fluorine ions contained in water was proposed, in which activated alumina with degraded activity, used for removing fluoride ions in water, was pre-treated with alkaline material and subsequently activity regenerating treatment was applied thereto, whereby degradation of regenerated activity can be prevented.
Abstract: PURPOSE: To provide a method of removing fluorine ions contained in water, in which activated alumina with degraded activity, used for removing fluorine ions in water, is pre-treated with alkaline material and subsequently activity regenerating treatment is applied thereto, whereby degradation of regenerated activity can be prevented. COPYRIGHT: (C)1978,JPO&Japio
2 citations
TL;DR: Alumina FE and alumina FF (fibrous powder containing no sodium) were synthesized and their surfaces and catalytic properties were studied as mentioned in this paper, and they were found to have high acid strengths and large amounts of oxidizing and reducing sites compared with gibbsite aluminas.
Abstract: Alumina FE (fibrous powder containing no sodium) and alumina FF (fibrous fine particles with small bulk density) were synthesized, and their surfaces and catalytic properties were studied. Both fibrillar aluminas were found to have high acid strengths and large amounts of oxidizing and reducing sites compared with gibbsite aluminas.For the isomerization of 1-butene, only Al2O3 FF showed no decrease in activity, and the selectivity (the ratio of cis-2-butene to trans-2-butene) was 1.6. In the reaction of propylene oxide, Al2O3 FE produced a larger amount of propion aldehyde compared with a gibbsite. On the other hand, Al2O3 FE predominantly formed ketone in the reaction of 1-methylcyclohexene oxide, while Al2O3 FF formed allyl alcohol predominantly. For the alkylation of phenol with methanol, Al2O3 FF was more active than Al2O3 FE, and it formed a larger amount of anisole than an activated alumina. For the hydrocracking of thiophene, MoO3 CoO mounted on a fibrillar Al2O3 was much more active than the same catalyst mounted on Al2O3 prepared by homogeneous precipitation.
Patent•
23 Jan 1976
TL;DR: Prods consisting of Al oxychlorides of the formula A12(OH)xCl6-x (in which x 6) are produced by reacting activated alumina (II), obtd by partial dehydration of Al2O3 hydrates (III), with HCl soln and/or Al chloride soln (II) pref has a specific surface area =200 m to second power/g and is used in the form of a powder or granules (III) pref is hydrargillite or alumina gel and is dehydratedin a hot gas stream
Abstract: Prods consisting (mainly) of Al oxychlorides (I) of the formula A12(OH)xCl6-x (in which x 6) are produced by reacting activated alumina (II), obtd by partial dehydration of Al2O3 hydrates (III), with HCl soln and/or Al chloride soln (II) pref has a specific surface area =200 m to second power/g and is used in the form of a powder or granules (III) pref is hydrargillite or alumina gel and is dehydratedin a hot gas stream The Al chloride can be an oxychloride prepd previously from (II) and HCl and/or Al chloride soln The reaction pref is carried out in several stages Cpds yielding small amts of acid anions, esp polyvalent anions, and/or alkali (ne earth) cations can be added to the reaction medium or (I) (I) in which X = 3-4 are esp useful for the treatment of sewage and sludge, whilst (I) in which x >5 are esp suitable for the mfr of catalyst carriers
Patent•
30 Dec 1976
TL;DR: Aluminum phosphate binder in an aq. soln. modified by adding of the phosphate(s) of Ca, Mg, Zn, Sr, Pb, Fe and/or Cd (pref.
Abstract: Aluminium phosphate binder in an aq. soln. modified by addition of the phosphate(s) of Ca, Mg, Zn, Sr, Pb, Fe and/or Cd (pref. Ca and/or Mg and/or Zn), is improved in that the Al equiv. is 0.7-2.90 w.r.t. the equiv. of the other metal(s), and the equiv. of Al and the other metal(s) w.r.t. the equiv. of phosphoric acid is 1.0-1.8. This binder is used for adhering together particulate zeolite molecular sieves, activated alumina, activated alumina gel, etc. to form bodies used as dry agents, filters, elements removing acid from cooling or air-conditioning systems, etc. The process is simple; the raw materials are abundant and relatively cheap. The porous components are mixed with the binder soln.; the mixt is moulded and fired. The molar ratios of the metals and phosphoric acid must be within the limits defined above to attain the maximal strength of the product. Suitable raw materials include quick or slaked lime, dolomite, zinc dust from zinc smelting, etc.
TL;DR: The co-pyrolysis of 3,4-dichloro-1-butene and methanol on activated alumina was carried out at 230°C as mentioned in this paper.
Abstract: The co-pyrolysis of 3,4-dichloro-1-butene (3,4-DCB-1) and methanol on activated alumina was carried out at 230°C. The reaction products contained a significant amount of methoxy-compounds as well as the dehydrochlorinated and isomerized compounds.
TL;DR: In this paper, the authors developed a method for computing the maximum possible bed temperature of a fixed-bed sorption column using the isosteric integral heat of adsorption, which was tested on two systems: (1) the Linde molecular sieve 4 A/water system and (2) the Alcoa activated alumina F-1 water system.
Abstract: Heat effects in fixed-bed sorption columns are often quite large and have a pronounced effect on the sorption kinetics. Proper design of such systems must include consideration of these effects. A method is developed for computing the maximum possible bed temperature. The model is tested on two systems: (1) the Linde molecular sieve 4 A/water system and (2) the Alcoa activated alumina F-1/water system. Since the predicted temperatures appeared to be low for the latter system, the model was refined by the inclusion of the isosteric integral heat of adsorption. Tests on the activated alumina show considerable improvement. The isosteres of two sorption therm correlations are investigated. The results show that the heat of adsorption of water on the alumina varies logarithmically with sorbate concentration—approaching high values at low concentrations and approaching the heat of vaporization of water at high concentrations. The results also suggest that the isosteric heat of adsorption behavior may be of use in assessing the “goodness of fit” of sorption therm correlations.
Patent•
26 Jan 1976
TL;DR: In this paper, the authors proposed a method to produce catalysts for use in the production of higher fluorinated halocarbon by the catalytic disproportionation of lower fluorinated carbon by making Al compounds as a catalytic carrier (eg activated alumina) support salt of Ni or Ti.
Abstract: PURPOSE: To produce catalysts for use in the production of higher fluorinated halocarbon by the catalytic disproportionation of lower fluorinated halocarbon, by making Al compounds as a catalytic carrier (eg activated alumina) support salt of Ni or Ti COPYRIGHT: (C)1977,JPO&Japio