Copper 11 sulfate-alumina

The reaction is cataly2ed by all but the weakest acids. In the dehydration of ethanol over heterogeneous catalysts, such as alumina (342—346), ether is the main product below 260°C at higher temperatures both ether and ethylene are produced. Other catalysts used include siUca—alumina (347,348), copper sulfate, tin chloride, manganous chloride, aluminum chloride, chrome alum, and chromium sulfate (349,350). 

Butyl Ether. -Butyl ether is prepared by dehydration of -butyl alcohol by sulfuric acid or by catalytic dehydration over ferric chloride, copper sulfate, siUca, or alumina at high temperatures. It is an important solvent for Grignard reagents and other reactions that require an anhydrous, inert medium. -Butyl ether is also an excellent extracting agent for use with aqueous systems owing to its very low water-solubiUty. 

Other Metallic Oxidants - Copper Sulfate or Oxone-Alumina... 

Scheme 6.32 Oxidation of a-hydroxyketones with alumina-supported copper sulfate or Oxone.

Figure 12.3 Intrusion-extrusion curves on an alumina sample coated with various amounts of copper sulfate, (a) Intrusion curve for all samples (b) extrusion curve for untreated alumina (c) extrusion curve for alumina treated with 0.5 % CUSO4 (d) extrusion curve for alumina treated with 2% CUSO4 (e) extrusion curve for alumina treated with 40% CUSO4.

Keywords benzoin, alumina, copper(II) sulfate, microwave irradiation, benzil... 

Other gas-solid containment systems, in which a significant amount of the original development work was invested by Shell, are based on copper oxide on an alumina support [47]. The absorption step of this system both oxidizes and traps the sulfur dioxide on the solid support as copper sulfate (Eq. 3.41). 

The Italian chemical journal, Rassegna Chemica 50), contains articles on technical and industrial developments and on chemical markets in Italy. Monthly statistics on Italian chemical production (quoted from the Ministry of Industry and Commerce) include the following synthetic ammonia, nitric acid, sulfuric acid, sodium carbonate, caustic soda, alumina, trichlorethylene, calcium carbide, carbon disulfide, explosives, superphosphates, ammonium sulfate, calcium cyanamide, calcium nitrate, ammonium nitrate, copper sulfate, dyestuffs, ethyl alcohol, methanol, tanning extracts, tartaric acid, citric acid, wood pulp and cellulose, and sodium nitrate. 

Concave isotherm. 23 Configuration of adsorbate, 54 alkyl groups, 201-202 aromatic hydrocarbons, 289-290 azaaromatics, 290 determination of. 205, 288-291 phenols on alumina. 306 Continuous development, 32 Convex isotherm, 23 Copper ion, as adsorbent additive, 177 Copper sulfate, as adsorbent, 177 Coupled columns, effect on bed efficiency. 

A concise preparation of pharmaceutically useful benzoxazin-2-ones in a few steps from salicylaldehydes and 2-hydroxyacetophenone, on montmorillonite KIO clay and alumina-supported copper sulfate, under solvent-free MW irradiation conditions, has been reported [189]. This high-yielding, expeditious, and eco-friendly... 

Purification actually starts with the precipitation of the hydrous oxides of iron, alumina, siUca, and tin which carry along arsenic, antimony, and, to some extent, germanium. Lead and silver sulfates coprecipitate but lead is reintroduced into the electrolyte by anode corrosion, as is aluminum from the cathodes and copper by bus-bar corrosion. 

Dutch State Mines (Stamicarbon). Vapor-phase, catalytic hydrogenation of phenol to cyclohexanone over palladium on alumina, Hcensed by Stamicarbon, the engineering subsidiary of DSM, gives a 95% yield at high conversion plus an additional 3% by dehydrogenation of coproduct cyclohexanol over a copper catalyst. Cyclohexane oxidation, an alternative route to cyclohexanone, is used in the United States and in Asia by DSM. A cyclohexane vapor-cloud explosion occurred in 1975 at a co-owned DSM plant in Flixborough, UK (12) the plant was rebuilt but later closed. In addition to the conventional Raschig process for hydroxylamine, DSM has developed a hydroxylamine phosphate—oxime (HPO) process for cyclohexanone oxime no by-product ammonium sulfate is produced. Catalytic ammonia oxidation is followed by absorption of NO in a buffered aqueous phosphoric acid... 

Hydrogenation. Hydrogenation is one of the oldest and most widely used appHcations for supported catalysts, and much has been written in this field (55—57). Metals useflil in hydrogenation include cobalt, copper, nickel, palladium, platinum, rhenium, rhodium, mthenium, and silver, and there are numerous catalysts available for various specific appHcations. Most hydrogenation catalysts rely on extremely fine dispersions of the active metal on activated carbon, alumina, siHca-alumina, 2eoHtes, kieselguhr, or inert salts, such as barium sulfate. 

Ethylamines. Mono-, di-, and triethylamines, produced by catalytic reaction of ethanol with ammonia (330), are a significant outlet for ethanol. The vapor-phase continuous process takes place at 1.38 MPa (13.6 atm) and 150—220°C over a nickel catalyst supported on alumina, siUca, or sihca—alumina. In this reductive amination under a hydrogen atmosphere, the ratio of the mono-, di-, and triethylamine product can be controlled by recycling the unwanted products. Other catalysts used include phosphoric acid and derivatives, copper and iron chlorides, sulfates, and oxides in the presence of acids or alkaline salts (331). Piperidine can be ethylated with ethanol in the presence of Raney nickel catalyst at 200°C and 10.3 MPa (102 atm), to give W-ethylpiperidine [766-09-6] (332). 

A mixture consisting of 0.69 g (10.5 mmoles) of zinc-copper couple, 12 ml of dry ether, and a small crystal of iodine, is stirred with a magnetic stirrer and 2.34 g (0.7 ml, 8.75 mmoles) of methylene iodide is added. The mixture is warmed with an infrared lamp to initiate the reaction which is allowed to proceed for 30 min in a water bath at 35°. A solution of 0.97 g (2.5 mmoles) of cholest-4-en-3/ -ol in 7 ml of dry ether is added over a period of 20 min, and the mixture is stirred for an additional hr at 40°. The reaction mixture is cooled with an ice bath and diluted with a saturated solution of magnesium chloride. The supernatant is decanted from the precipitate, and the precipitate is washed twice with ether. The combined ether extracts are washed with saturated sodium chloride solution and dried over anhydrous sodium sulfate. The solvent is removed under reduced pressure and the residue is chromatographed immediately on 50 g of alumina (activity III). Elution with benzene gives 0.62 g (62%) of crystalline 4/5,5/5-methylene-5 -cholestan-3/5-ol. Recrystallization from acetone gives material of mp 94-95° Hd -10°. 

Symmetrical and unsymmetrical benzoins have been rapidly oxidized to benzils in high yields using solid reagent systems, copper(II) sulfate-alumina [105] or Oxone-wet alumina [105, 106] under the influence of microwaves (Scheme 6.32). Conventionally, the oxidative transformation of a-hydroxy ketones to 1,2-diketones is accomplished by reagents such as nitric acid, Fehling s solution, thallium(III) nitrate (TTN), ytterbium(III) nitrate, ammonium chlorochromate-alumina and dayfen. In addition to the extended reaction time, most of these processes suffer from drawbacks such as the use of corrosive acids and toxic metals that generate undesirable waste products. 

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