Activated aluminum oxide

Activated aluminum oxide Macroporous polymer particles... 

Another method of preparation described is the treatment of activated aluminum oxide with 1 % aqueous hydrogen fluoride (HF/A1,0, molar ratio = 0.26) in a polyethylene vessel.15 The aluminum trifluoride is filtered oil and dried for 6 hours at 120 C. A catalyst produced in this manner reduces the evolution of hydrogen chloride during the subsequent disproportionation reaction. 

Immobilized catalyst was obtained by impregnating 1.58 g of neutral active aluminum oxide shaped as spheres 1.5 mm in diameter (with specific surface over 500m2/g) with iron(III) perfhiorotetraphenylporphyrin solution. Then the applied catalyst with 30 mg/g active... 

The peroxidase mimetic and its enzymatic analog consist of two components active and carrying. The carrier represents neutral activated aluminum oxide, on which active site (hematin with 8.6 wt.% iron), produced by Sigma Company, is applied [11, 12], The biomimetic was synthesized according to the known technique. 

Out of batch box 2 triethylaluminum (in the form of 10-12% isooctane or petrol solution) is pumped with batching pump 4 into the top part of absorber 3. The middle of the absorber is filled under the pressure of 3-4 MPa with ethylene, which has been dried and purified in the system of subsequent towers with active aluminum oxide and active coal. In the absorber the triethylaluminum solution is presaturated with ethylene to ensure exact operation of the batching equipment. The triethylalumi-num ethylene mole ratio can be from 1 9 to 1 25 depending on the desired distribution of alkyl groups in aluminumtrialkyls. 

Schwanert318 in 1860 observed probably the first conversion of furan derivatives into those of pyrrole. This reaction has been fully described,1 and is best carried out nowadays in the gas phase. Thus, furan or one of its derivatives is heated with ammonia or a primary amine to 400-450°, in the presence of activated aluminum oxide or aluminum silicate. The yield varies between 30 and 50% in most cases.319"324... 

SYNS A 1 (sorbent) Al-0109 P ABRAREX ACTIVATED ALUMINUM OXIDE ALCOA F 1 ALMITE ALON ALUMINA a-ALUMINA (OSHA)... 

The ether solutions are combined, and the solution is dried over 100 g. of calcium chloride for at least 3 hours. The purple solution is filtered and then evaporated in a rotating evaporator to a syrupy residue. The tarry red residue is dissolved in 100 ml. of hot (70°) benzene. The benzene solution is allowed to cool and is then poured onto a chromatographic column (approximately 35 X 300 mm.) packed under benzene with 50 g. of activated aluminum oxide. A dark violet band is rapidly eluted from the column with methylene chloride (dichloromethane). Evaporation of the violet methylene chloride solution yields 2.2 to 2.8 g. of purple crystals (20 to 26%) m.p. 182 to 183°. 

Chloral (trichloroacetaldehyde), CCI3CHO, oxidizes secondary alcohols to ketones in the presence of very active aluminum oxide (Woelm). This reaction seems to be superior to the Oppenauer oxidation, because it takes place at room temperature or at only slightly elevated temperatures [958, 959, 960],... 

Activated alumina activated aluminum oxide alpha aluminum oxide alumina alumina, activated alumina, calcined alumina, tabular aluminum oxide alumite aluminum trioxide. 

After separating off the hydrogen peroxide, the working solution has to be dried and freed of byproducts e.g. with active aluminum oxide. This occurs in a bypass. 

The process gas from the combustion chamber is cooled in the waste heat boiler to the temperature required for the first reactor of ca. 300°C. In this reactor, filled with a cohalt-molybdenum catalyst (on an aluminum oxide support), the conversion of up to 80 to 85% of the hydrogen sulfide is carried out. After condensing out the sulfur formed at temperatures below 170°C, the temperature of the reaction gases is increased to the reaction temperature of the second reactor (ca. 220°C), which contains a highly active aluminum oxide catalyst with a large surface area (200 to 300 m /g) in which the residual hydrogen sulfide and sulfur dioxide react with one another. 

C10H14O, Mr 150.22, pioi.3kPa 232.5 °C, df 0.9756, n53° 1.5227, is the main constituent of thyme and some origanum oils it also occurs in many other essential oils. It forms colorless crystals (mp 51.5 °C) with a spicy-herbal, slightly medicinal odor reminiscent of thyme. Thymol is prepared on a technical scale in a continuous high-temperature, high-pressure, liquid-phase, ort/io-alkylation process, from m-cresol and propylene, in the presence of activated aluminum oxide hydrate [163a],... 

There are some complicating factors, notably temperature. Stearic acid vapor reacts with activated aluminum oxide to form an aluminum stearate which is tenaciously retained by the adsorbent. On raising the temperature of the system, the desorbed material is not stearic acid but decarboxylated, cracked olefinic hydrocarbons. 

In order to separate the aliphatic and aromatic fractions, a aliquot of the extract was applied to 5 g of activated aluminum oxide and silica-gel column, respectively 5 g of activated Florisil column for pesticides, topped... 

The ability, when known, of a chemical (e.g., ethers) to formtmstable and potentially explosive peroxides or to cause polymerization. When polymerization inhibitors are known or recommended, they have been included. According to National Safety Council Data Sheet 1-655/rev. 1982, peroxides can be rendered harmless with iron(II) sulfate (1 1) or by passing the liquid material over a bed of activated aluminum oxide [-alumina (OSHA)]. 

Purification of diethyl ether by aluminum oxide 14 Peroxidized ether is filtered through an upright column filled with activated aluminum oxide. This removes peroxides completely and reduces the water and aldehyde content of the ether. Filtration through a column 1.9 cm in diameter and 33 cm long, containing 82 g of aluminum oxide, removes peroxides completely from more than 700 ml of ether that contained 127 mmoles of oxygen per liter. 

Peroxides are removed from dioxan by shaking it with zinc(n) chloride22 or by filtration through activated aluminum oxide (as for diethyl ether),14 the acetal by hydrolysis with concentrated hydrochloric acid, and the acetic acid and water by treatment with potassium hydroxide and sodium. 

The conversion of toluene and ethylbenzene on finely dispersed nickel (1, 10, 20, and 30% Ni) deposited on activated aluminum oxide, at 460° and 0.5 space velocity, under both elevated (25 and 50 atmospheres) and ordinary hydrogen pressures was also investigated. In all experiments the molar hydrogen-hydrocarbon ratio was approximately 5 1. 

The carrier alone (activated aluminum oxide) produces only a sUght change in these hydrocarbons at 460° and 50 atmospheres. 

At the same time, thin-layer series electrodes were being developed for microbore LCEC (Goto et ai, 1981, 1982). With flow rates of 10-100 //1/min, the arrangement could provide 100% conversion efficiency at each sensor. An automated-trace-enrichment, tandem column system was devised for the direct injection of urine samples containing catecholamines (Fig. 33 A). Samples were injected onto an activated aluminum oxide microbore column with a pH 8.8 Tris buffer. The alumina column was then coupled with the reversed-phase microbore analytical column the catechols were eluted using pH 1.8 mobile phase. The downstream electrode was monitored (Fig. 33B). 

Synonyms cas 1344-28-1 alumina alumite alundum activated aluminum oxide aluminum sesquioxide... 

Applies to ethers etc. Peroxides can form in the storage area. Residues from evaporation or heating can explode spontaneously. In some cases the peroxides thus formed can cause polymerization. Peroxides are normally rendered harmless with iron (II) sulfate or by passing the liquid over a bed of activated aluminum oxide (see Data Sheet 1-655-rev. 82 of the National Safety Council). 

Activated alumina Activated aluminum oxide. See Alumina... 

CAS 1344-28-1 1333-84-2 (hydrate) EINECS/ELINCS 215-691-6 Synonyms Activated alumina Activated aluminum oxide Alumina, activated Alumina, calcined Alumina, tabular Aluminium oxide alumite Aluminium oxydes C Aluminum oxide Aluminum oxide (2 3) Alumite Alundum Calcined alumina Tabular alumina Classification Inorganic compd. 

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