Abstract: High surface area alumina, and a method of preparing them. More specifically, a method of preparing aluminas having a surface area of from about 300 square meters per gram to about 700 square meters per gram, by preparing a first solution of an aluminum alkoxide and an organic solvent selected from the group consisting of ethers, ketones, aldehydes, and mixtures thereof, admixing the first solution with a second solution comprising water and an organic solvent selected from the group consisting of ethers, ketones, aldehydes, and mixtures thereof, to form a solid material, and drying and calcining the solid material to recover alumina. Also, an alumina with an average micropore diameter of from about 20 angstroms to about 100 angstroms, and a total pore volume of from about 0.35 ml/g to about 1 ml/g.

Abstract: Aluminum chlorohydrate is prepared by a method comprising(a) forming aluminum methoxide from aluminum alkoxides using methanol;(b) recovering aluminum methoxide as a solid precipitate phase, washing to remove higher alcohols and drying to recover a powder;(c) reacting the recovered powdered aluminum methoxide with dilute hydrochloric acid to form aluminum chlorohydrate.

Abstract: Improved .gamma.-alumina suitable for use as a catalyst carrier having high mechanical strength, a large specific surface area, and a substantially uniform pore size distribution in a relatively small portion of the pore size range below 500 A. Said alumina is produced by first establishing a seed aluminum hydroxide hydrogel having a pH of between 6 and 10 and then repetitively and sequentially adding an aluminum compound to adjust the pH to less than 5 or more than 11 to dissolve crystallites of aluminum hydroxide followed by addition of a neutralizing agent to return the hydrogel to the pH range from about 6 to 10 to cause pseudo-boehmite crystallites to grow. After a sufficient number of repetitions of said sequential addition, sparse aggregates of crystallites of the desired structure are formed. These are dried and calcined to produce the said alumina.

Abstract: Dried amorphous aluminum hydroxide gels having substantial acid reacting capability over an extended period of time are prepared by drying the gel after contacting the aqueous liquid gel with an inert organic solvent of sufficient solubility in water to replace water in the gel. The dried gel product and pharmaceutical compositions comprising the gel are also novel.

Abstract: The invention relates to a process for preparing alumina being suitable for layer chromatography.The alumina suitable for layer chromatography is prepared in accordance with the invention in such a manner that an aluminium trinydroxyde containing 34 to 37% by weight of bayerite, 3 to 5% by weight of pseudoboehmite and 60 to 62% by weight of amorphous aluminium trihydroxide is heated at 300.degree. C. to 400.degree. C. for 2 to 4 hours.The activated alumina thus produced is snow-white, has a large specific surface and its average grain size is within the range between 8 and 20 .mu.m.The product complies with the requirements of layer chromatographical technique.

Abstract: Alumina is produced by the hydrolysis of aluminum alkoxide in a continuous process in which the hydrolysis reaction, the aging of hydrated alumina product and the stripping of occluded by-product alcohol from the alumina particles is accomplished in the same reaction vessel.

Abstract: In the production of alumina from aluminous ores by the Bayer process, the present invention provides an improvement for effectively and economically recovering caustic components consisting essentially of sodium aluminate from aluminum hydroxide cakes as seed classified from the product aluminum hydroxide by washing the seed with a washing liquor having a substantially saturated concentration of sodium oxalate and little content of caustic and then removing organic substances such as sodium oxalate from the washed seed by secondly washing said seed with hot water, thereby recovering caustic components without the dissolution of sodium oxalate from the seed into the recovered caustic solution and attaining the removal of sodium oxalate contaminant with high efficiency.

Abstract: Alumina slurries (suspensions) can be stabilized against viscosity increases by treating with water which has been heated to temperatures of from about 40.degree. C. to about 100.degree. C., then cooling, decanting the water, and recovering a wet cake. Water is then added to the recovered wet cake alumina to obtain a slurry with a desired alumina content and CO.sub.2 is sparged through the finished slurry. Optionally, hot water saturated with carbon dioxide can be used for the treatment, to extend the stability of the slurry. Peptizing agents can be used as usual.

Abstract: Alumina having a low loose bulk density is obtained by hydrolyzing aluminum alkoxides with water in the presence of lithium hydroxide or lithium salts yielding lithium ions. The amount of density reduction is proportional to the amount of lithium ion present.

Abstract: An improved method for increasing alumina pore volumes said alumina being produced by the hydrolysis of aluminum alkoxides, the improvement comprising diluting the aluminum alkoxide, prior to entering the hydrolysis reactor, with an alkanol containing from 2 to 8 carbon atoms and injecting the dilute solution into the reactor at high velocities.

Abstract: A highly porous alumina having a large surface area and a low bulk density is prepared by hydrolyzing an aluminum alcoholate at a temperature of 40.degree. to 90.degree. C. in an aqueous solution containing 8 to 30% by weight of a compound which upon drying or activating splits out NH.sub.3 and/or CO.sub.2, there being used 0.5 to 3 parts by weight of the compound per 10 parts of aluminum alcoholate. The aluminum oxyhydrate paste formed by the hydrolysis is separated from the alcohol phase, in a given case is also purified, and subsequently dried or activated.

Abstract: The method of preparing granulated activated alumina consists in that alumina trihydrate is decomposed by bringing it in contact with a bed of a solid heat carrier having the temperature of 350.degree. to 600.degree. C., the contact time being from 0.05 to 0.5 second, to obtain a product of decomposition in the form of amorphous aluminium hydroxide. Said decomposition product is mixed with water into a suspension having the concentration of 100-500 g/liter, calculating with reference to aluminium oxide, and hydrated at a temperature of 20.degree.-100.degree. C. and the pH of 5 to 12 for 0.5 to 10 hours. The hydrated decomposition product is then treated with an acid, that can form water-soluble basic salts of aluminium, at a temperature of 20.degree. to 150.degree. C., granulated, dried at a temperature of 20.degree. to 150.degree. C., and calcined at a temperature of 400.degree. to 600.degree. C.

Abstract: A low soda pseudoboehmite gel is provided by reacting a NaAlO.sub.2 solution with a NaHCO.sub.3 solution having a concentration of less than 75 grams/liter and preferably less than 50 grams/liter. The soda content of the resulting AlO(OH) gel can be further lowered by repeated washing and/or redispersing (repulping) in water and/or further neutralization with a carboxylic acid having 1 to 6 carbon atoms.

Abstract: Pure alumina is produced from aluminum metal by steps of activation by stripping the oxide layer in an acidic aqueous medium; washing in a neutral medium; reacting in a neutral, acidic or alkaline medium to give hydrated alumina; and igniting the hydrated alumina.

Abstract: High macro-pore content spheres (>1000A) are produced by use of a rotating wheel, wherein dry alumina is dropped onto the wheel under a peptizing spray misted onto the wheel through an atomizing device. Compressive stresses normally encountered in procedures such as pelletizing are avoided, thereby preserving macro-pores. Size of spheres can be adjusted by altering, for example, the angle at which the wheel rotates.

Abstract: A single crystal of Al.sub.2 O.sub.3 is epitaxially grown on an Si-single crystal of a semiconductor device by a vapor growth method. This vapor growth method employs starting materials of HCl, Al and CO.sub.2. Further, this method advantageouslyemploys a carrier gas to carry the gaseous product of the reaction of HCl with Al. An apparatus for the production of the above-mentioned semiconductor device comprises a chamber means for the reaction of the gaseous product and the single crystal, a reaction chamber for the reaction of Al and HCl, and an introducing tube for introducing CO.sub.2 in the proximity of the Si-single crystal.

Abstract: An improvement in the method of preparing alumina by water hydrolysis of aluminum alkoxides is disclosed. Briefly, the improvement comprising admixing the water and aluminum alkoxide under high velocity conditions prior to passing the resulting admixture to the reactor. The improved process results in a product having improved physical properties, particularly pore volume and bulk density.

Abstract: Disclosed is a method for forming shaped catalysts from a rehydratable alumina composition. The method includes a staged rehydration procedure to stabilize the rehydratable alumina to facilitate extrusion processing.

Abstract: Pseudo-boehmite having a bulk density of about 0.05 to 0.2 g/cc, an oil absorption of about 2.5 to 6.0 cc/g, a pore volume of about 2.0 to 7.0 cc/g over a pore diameter range of 176.mu. to 0.0035.mu. and a specific surface area of about 200 to 500 m.sup.2 /g, and a process for producing the same; useful as a filler, an absorbent, a catalyst, a filtering agent and a base material for composites; prepared by mixing alkali aluminate and halohydrin together at a low temperature, heating for reaction the resulting mixture, cooling the reacting solution, separating the resulting precipitate by filtration and, if desired subjecting the precipitate to washing with an organic solvent followed by drying.

Abstract: A method of reducing discoloration of alumina which is caused by exposure of said alumina to high temperatures is disclosed. The method comprises adding an effective amount of an inorganic oxidizing agent (e.g. H.sub.2 O.sub.2 or NaOCl) to the alumina prior to exposing it to the high temperature.

Abstract: Aluminum alkoxides are hydrolyzed at low temperatures using high injection velocities and are then vacuum stripped at or below 80.degree. C to produce .beta.-alumina trihydrates in large proportion. The .beta.-alumina trihydrate can then be converted to eta alumina.

Abstract: Substantially spherical alumina particles are obtained by a process comprising ageing substantially spherical alumina hydrogel particles obtained by the oil-drop method in an ammonium hydroxide solution wherein the concentration of ammonia changes continuously from an initial concentration in the range of from about 0.05 wt.% to about 0.5 wt.% to a final concentration in the range of from about 0.8 wt.% to about 2.5 wt.%. Alumina particles obtained by this process possess improved physical strength. Alumina particles which are obtained by calcining alumina particles aged in an ammonium hydroxide solution, wherein the concentration of ammonia increases continuously, at a temperature in the range of from 650.degree. to 800.degree. C in an atmosphere containing 30 mol.% or more of H.sub.2 O possesses a further improved thermal stability.

Abstract: A process for the catalytic reforming of a naphtha fraction is disclosed. A naphtha fraction and hydrogen are commingled and passed in contact with an alumina-supported reforming catalyst at reforming conditions. The alumina support is characterized by a novel method of preparation affording an improved reforming process. The preparation comprises admixing an alpha-alumina monohydrate with an alkaline solution having a pH of at least about 7.5 and forming a stable suspension. A salt of a strong acid, or a solution of a salt of a strong acid, is admixed with the suspension to form a paste or dough which is subsequently extruded, dried and calcined to form said alumina support.

Abstract: Alumina catalyst carriers are produced by bonding pre-fired gibbsite with microcrystalline boehmite. Superior strength of the product is achieved by use of gibbsite fired to an L.O.I. at 1000.degree. C of 8% or less, or preferably less than 4%.

Abstract: A catalyst is provided which comprises a hydrogenation component composited with an alumina support prepared by reacting an alkali metal aluminate with an aliphatic dicarboxylic acid, e.g. oxalic acid.

Abstract: An alumina composition particularly useful as a catalyst support or carrier material is disclosed. The alumina is characterized by a method of preparation which comprises admixing an alpha-alumina monohydrate with an alkaline solution having a pH of at least about 7.5 and forming a stable suspension. A salt of a strong acid is commingled with the suspension to form a paste or dough which is subsequently formed into extrudates, and dried and calcined.

Abstract: Stable dried aluminum hydroxide gels possessing the high acid reactivity of liquid aluminum hydroxide gel are prepared by drying the gel from non-aqueous solvents.

Abstract: A basic aluminum hydroxycarbonate hydrate, usable as an antacid, is prepared by simultaneously adding aqueous solutions of aluminum sulfate and alkali hydrogen carbonate or alkali carbonate to water while maintaining a neutral or weakly alkaline pH and adjusting the pH-value of the reaction mixture, after completed precipitation, to about 6.0 by adding an aluminum salt of a strong acid.

Abstract: Aluminum carbonate hydroxide ammonium, a new compound, is produced by causing a solution of ammonium hydrogencarbonate to be reacted upon by a soluble aluminum salt. .alpha.-Alumina is obtained by thermal decomposition of this ammonium aluminum carbonate hydroxide. By sintering said .alpha.-alumina, there is obtained sintered .alpha.-alumina.

Abstract: Alumina dust, particularly partially calcined alumina dust, is coarsened by forming an aqueous admixture or slurry comprising the alumina dust and finely divided calcium carbonate and introducing the resulting aqueous admixture or slurry into Bayer pregnant liquor and precipitating alumina trihydrate from the resulting Bayer pregnant liquor.

Abstract: Formed products are made from aqueous aluminum oxyhydrate by peptizing the aqueous aluminum oxyhydrate with an acid and then subsequently adding a dilute solution of ammonia or an ammonia yielding compound following by extrusion, drying and calcining.

Abstract: A hydroperoxy-group-containing aluminum compound is prepared by a process which comprises:Contacting and reacting, at room temperature or below, and in the substantial absence of water, (a) a reactive metal comprising aluminum of a purity of at least 99.9% by weight permeated with a liquid metal selected from mercury, gallium and indium/gallium alloys with (b) a liquid reactant comprising (i) hydrogen peroxide in (ii) a liquid organic compound having no multiple carbon-to-carbon bonds.The aluminum compounds produced can be used, for example, as substrates for electronics, in the preparation of synthetic gems, ceramics and paint pigments. The aluminum compound is prepared in sheet for plate form, resembling mica in physical appearance.In an alternative embodiment, a metal or metal salt is added to the reactive system to yield a hydroperoxy-group-containing aluminum compound with the desired metal deposited thereon.

Abstract: Alumina having a surface area from about 250 to about 500 m.sup.2 /g, a loose bulk density from about 10 to about 30 lbs/ft.sup.3, a pore volume (0-10,000 A) from about 0.6 to about 2.5 cc/g and a pore volume (0-1,000 A) of at least 0.6 cc/g wherein 70 to 95 percent of said pore volume (0-1,000 A) consists of pores having a diameter in the range of 35 to 80 A and a method for producing such alumina by the water hydrolysis of aluminum methoxide.

Abstract: Water dispersible aluminum hydroxide is prepared by treating an acid dispersible aluminum hydroxide with 1 to 9 weight % of a gaseous acid.

Abstract: A high-porosity, high-surface area, low-density alumina and a method for preparing said alumina. The alumina typically has a surface area from about 260 to about 400 m.sup.2 /g, a pore volume from about 1.0 to about 2.75 cc/g, a loose bulk density from about 7.5 to about 25 lb/ft.sup.3, and is produced by contacting aqueous alumina slurries with an effective amount of an organic solvent and drying the resulting solvent-aqueous alumina mixture.

Abstract: A method of producing an alumina bearing product in which the alumina is substantially soluble in cold alkali including the steps of contacting an aluminium bearing material with concentrated sulphuric acid containing 30 to 100 weight percent sulphuric acid, heat treating the acid and material to cause the acid to react with the material to form a substantially anhydrous hard product and decomposing the product by heat treatment to produce the alumina bearing product. The alumina values may be recovered from the resulting alumina bearing product using the known Bayer process. The process has particular application to non-bauxitic ores.

Abstract: Pure, high surface area alumina is produced by the reaction of aluminum salts with lower aliphatic epoxides in an aqueous media and is washed with aqueous solutions of ammonia which have a pH of at least 7.

Abstract: Alumina having improved color characteristics and improved extrusion properties is produced by an improvement in the process for producing low-density, high-porosity, high-surface area alumina from an aqueous alumina slurry by contacting said aqueous alumina slurry with an effective amount of an organic solvent to form a solvent-aqueous alumina mixture; drying said mixture and recovering said low-density, high-porosity, high-surface area alumina, comprising drying said solvent-aqueous alumina mixture in an inert atmosphere.

Abstract: Low-density, high-porosity alumina extrudates and a method for preparing said extrudates. Said method comprises admixing finely divided low-density, high-porosity alumina with water to form an extrudable composition and extruding said mixture.

Abstract: Alpha alumina monohydrate wherein a majority of the cumulative pore volume consists of pores from about 30 to about 120 A in diameter and a method for producing such alumina. This is a continuation of application Ser. No. 298,116, filed Oct. 16, 1972 and now abandoned.

Abstract: A method of preparing spheroidal refractory inorganic oxide particles characterized by low bulk density in combination with high micropore volume is disclosed. The particles, especially low bulk density - high micropore volume alumina particles, are useful as a support or carrier material for catalytically active materials to yield an improved hydrocarbon conversion catalyst.

Abstract: A process for preparing aluminium oxide beads from alumina hydrogel, which comprises polymerizing, in a hot and substantially water-immiscible fluid, an aqueous mixture comprising alumina hydrogel and alumina hydrosol and a water-soluble monomer whose uncross-linked polymer is water-soluble or forms a gel, this mixture being dispersed as droplets into a hot fluid in which substantial polymerization of the monomer occurs.

Abstract: A process for preparing aluminum oxide beads from alumina hydrogel, comprising polymerizing in a hot and substantially water-immiscible fluid, an aqueous mixture which contains alumina hydrogel and a water soluble monomer whose uncross-linked polymer is water soluble or forms a gel, this mixture being dispersed as droplets into said fluid in which substantial polymerization of said monomer is performed.

Abstract: Dispersible colloidal particles of .alpha. alumina monohydrate are prepared by conditioning aqueous solutions of an aluminum salt with an organic solvent and the precipitating alumina with an aqueous solution of base. The reaction mixture is heated under pressure, filtered, washed and dried to obtain the product.

Abstract: High surface area alumina materials, which are particularly effective catalyst supports or carriers, are prepared by heating alumina monohydrate, alumina trihydrate or mixtures thereof from 450.degree.-500.degree. to at least 800.degree.F in the presence of excess elemental chlorine. The heating of the alumina material with elemental chlorine is conducted prior to said alumina material being heated to a temperature above about 450.degree.-500.degree.F in the absence of elemental chlorine. The alumina monohydrate or trihydrate compositions are derived from the aqueous phase reaction of ethylene oxide with aluminum chloride and/or aluminum hydroxychloride.

Abstract: Catalysts capable of desulfurizing organo-sulfur compounds particularly those normally found in petroleum compositions, such as thiophene, are prepared from metal-containing compounds of metals of Groups VIB and VIII of the Periodic Table on a refractory support or base. Of particular interest are catalysts containing components of cobalt and molybdenum oxides on alumina which preparation utilizes dimethyl sulfoxide (DMSO). The use of such catalysts provides increase of conversion rate-constants of desulfurization reactions. A process of treating the base and the base material obtained from such process are also disclosed herein.

Abstract: Powdery alumina hydrate is produced from an alkylaluminum compound by hydrolysis of the alkylaluminum compound by water through the following steps; converting the alkylaluminum compound to an ether complex compound: partially hydrolyzing the ether complex compound in the presence of an non-reactive solvent at a temperature of not higher than about 150.degree.C with stirring so that no alumina hydrate is precipitated until at least 0.8 moles of water reacts with one mole of the alkylaluminum compound, thereby forming polyaluminoxane; completely hydrolyzing the resulting polyaluminoxane at a concentration of not more than about 3.0 grams-atoms as aluminum per liter of non-reactive solvent at a temperature of about 10.degree. to about 150.degree.C with stirring, so that one mole of the feed alkylaluminum compound may be ultimately hydrolyzed completely with 2 to 10 moles of water, thereby precipitating alumina hydrate; and then separating the resulting alumina hydrate from the non-reactive solvent.

Abstract: Alumina fibre is prepared by spinning a solution containing an aluminium compound and an organic polymer, removing solvent and contacting the fibre with ammonia or an amine before conversion of the fibre to alumina.

Abstract: The invention relates to the production of alumina whiskers from alumina-bearing material by preparing an intimate mixture of such material and carbon and then passing a stream of gaseous aluminium trihalide and an inert carrier gas thereover in a first zone at an elevated temperature, usually 1400.degree.C to 1800.degree.C, at which reaction occurs to form aluminium monohalide and carbon monoxide. The gaseous stream comprising the two latter materials is then passed to a second zone maintained at a less elevated temperature than the first zone, usually 1400.degree.-1000.degree.C, at which temperature the reaction is reversed to produce a gaseous stream carrying alumina and carbon. Under conditions of low supersaturation the alumina deposits as single crystal alumina whiskers from which any carbon can be removed by an oxygen-containing gas at temperatures of 800.degree.-1000.degree.C.

Abstract: A transparent, activated, nonparticulate alumina with a total porosity of about 63% which consists of a unique pore morphology and size distribution and is thermally stable up to about 1,200.degree.C. at which temperature it can be nondestructively converted to alpha alumina is disclosed as well as a method of preparing said alumina by hydrolyzing aluminum alkoxides to form a particular sol which is essentially clear to the naked eye and the gel of which retains its integrity during drying and pyrolysis. The alumina thus produced is useful as a catalyst, absorbent and desiccant. In addition, a method of preparing the intermediate clear colloidal sol or gel consisting essentially of aluminum monohydrate is disclosed. This intermediate can be used to coat various substrates.