Anhydrous magnesium perchlorate

The preferred method of determining water in glycerol is by the Kad Fischer volumetric method (18). Water can also be determined by a special quantitative distillation in which the distilled water is absorbed by anhydrous magnesium perchlorate (19). Other tests such as ash, alkalinity or acidity, sodium chloride, and total organic residue are included in AOCS methods (13,16,18). 

Chemical Designations - Synonyms Anhydione Dehydrite Magnesium perchlorate, anhydrous Magnesium perchlorate, hexahydrate Chemical Formula Mg(C104)2. 

Two absorbents are required, one for water vapour, the other for carbon dioxide. The absorbents for water vapour which are generally employed are (a) anhydrous calcium chloride (14-20 mesh), (b) anhydrous calcium sulphate ( Drierite or Anhydrocel ), and (c) anhydrous magnesium perchlorate ( Anhydrone ). Both (b) and (c) are preferable to (a) (c) absorbs about 50 per cent of its weight of water, but is expensive. Anhydrous calcium chloride usually contains a little free lime, which will absorb carbon dioxide also it is essential to saturate the U-tube containing calcium chloride with dry carbon dioxide for several hours and then to displace the carbon dioxide by a current of pure dry air before use. 

Studies Using Anhydrous Magnesium Perchlorate , G.F. Smith Chem Co, Columbus, O (1935) CA 29,6132 7) M.J. Stross G.B. Zimmer-... 

In the preparation of anhydrous DMSO by a literature method [1], an explosion occurred during distillation from anhydrous magnesium perchlorate [2], This may have been due to the presence of some free methanesulfonic acid as an impurity in the solvent, which could liberate traces of perchloric acid. It is known that sulfoxides react explosively with 70% perchloric acid, (but several metal perchlorates also form unstable solvates with DMSO) The alternative procedure for drying DMSO with calcium hydride [3] seems preferable, as this would also remove any acidic impurities. 

In flame calorimetry, it is not easy to measure directly with good accuracy the mass of reactants consumed in the combustion. Therefore, the results are always based on the quantitative analysis of the products and the stoichiometry of the combustion process. In the case of reaction 7.73, the H20 produced was determined from the increase in mass of absorption tubes such as M, containing anhydrous magnesium perchlorate and phosphorus pentoxide [54,99], When organic compounds are studied by flame combustion calorimetry, the mass of C02 formed is also determined. As in bomb calorimetry, this is done by using absorption tubes containing Ascarite [54,90]. 

MAGNESIUM PERCHLORATE Anhydrone, Dehydrlte, Magnesium perchlorate, anhydrous, Magnesium perchlorate hexahydrate Oxidizing Materisl, II 1 0 0 oxy... 

Methanol (MeOH) [5i] Because commercial products are highly pure, they are applicable for most general purposes without purification. To remove water (300-1000 ppm) in commercial MeOH, it is distilled with a good fractionating column under the exclusion of moisture and the water content is reduced to 100 ppm. Then the distillate is twice distilled over metallic sodium (1-2 g 1 ) and the fraction within 0.01 °C of the boiling point is immediately used. In this case, water content is 0.5 ppm. Caution Anhydrous magnesium perchlorate is not suitable to dry MeOH danger of explosion ... 

The absorption train is composed of a tube packed with water absorbent, a second tube packed with a carbon dioxide absorbent, and a guard tube packed with equal volumes of the water and carbon dioxide absorbents. Anhydrous magnesium perchlorate (MgC104) is commonly used for the water absorbent, while sodium hydroxide (NaOH) or potassium hydroxide (KOH) impregnated in an inert carrier is used as the carbon dioxide absorber. 

Recently anhydrous magnesium perchlorate has been used successfully690 as an internal desiccant however, caution is indicated because of the explosion hazard.1080... 

A modified Coleman Model 33 Carbon-Hydrogen Analyzer was used to control the oxygen flow rate, to pretreat the oxygen (anhydrous magnesium perchlorate and anhydrous lithium hydroxide) and to hold the combustion tube in position. The analyzers furnace was controlled by a Fisher Model 360 Linear Temperature Programme. The rate of temperature increase was variable from 0.5 to 25 C per minute. Normally, the temperature programmer... 

Meyers and co-workers141 have recently reported an improved method for obtaining enaminoketones from j8-aminonitriles instead of j8-amino esters (Scheme 8). The enamines, which are easily obtained from ]8-aminopropionitriles, yield the amino dihydropyrindinium salt (210) on warming with anhydrous magnesium perchlorate or magnesium iodide in benzene or toluene. It was proposed that the role of magnesium... 

The desiccant is anhydrous magnesium perchlorate, which quantitatively absorbs the water produced by the combustion reaction as well as the water produced by the above reaction. Neither the Ascarite nor the desiccant reacts with compound B or oxygen. The total mass of the container with the Ascarite and desiccant is 765.3 g. 

Anhydrous magnesium perchlorate, Mg(C104)2, and barium perchlorate, Ba(C104)2, are used as drying agents (desiccants). These salts have a very strong attraction for water. Nearly all of the perchlorates are highly soluble in water potassium perchlorate is exceptional for its low solubility, 0.75 g/100 g at 0" C. 

The values are based on dry weights. Samples of this SRM must be dried before weighing and analysis by, for example, drying in a desiccator at room temperature (ca. 22 °C) for 120 h over fresh anhydrous magnesium perchlorate. The sample depth should not exceed 1 cm. 

Anhydrone, anhydrous magnesium perchlorate, Mg(CI04)2, 10 to 15 g/S Detergent, liquid, 1 mL/S Diluting solution... 

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