Carbon dioxide atmosphere and

The main advantages of the Cosorb process over the older copper ammonium salt process are low corrosion rate, abiHty to work in carbon dioxide atmospheres, and low energy consumption. The active CuAlCl C H CH complex is considerably more stable than the cuprous ammonium salt, and solvent toluene losses are much lower than the ammonia losses of the older process (94). 

Methylthiophene has been prepared by the dry fusion of a salt of methylsuccinic acid and phosphorus trisulfide. 4 This reaction was later investigated quite completely in respect to ratio of reactants, rate of heating, carbon dioxide atmosphere, and dilution of reactants with sand.6 An excellent technical method for preparing methylthiophenes has been described which involves a vapor-phase reaction of preheated sulfur with pentanes.6 3-Methylthiophene has also been prepared by adding 50% crude isoprene (amylenes) to molten sulfur at 350°.7... 

Note 1. A mixture of 100 ml of hydriodic acid and lg of purified red phosphorous is refluxed gently for 2h under a carbon dioxide atmosphere and then distilled. Distillate, having a constant boiling point of 126-127°C, is collected. It is convenient to divide the distillate into 5-ml portions and transfer each portion to a 10-ml brown, general-purpose ampule. The ampules are flushed with nitrogen and sealed with a flamesealing torch. One ampule of hydriodic acid is used for each methoxyl... 

C(CeH5)2, is obtained by the interaction of diphenyldiazomethane and triethyiphosphine in petroleum ether, employing a carbon dioxide atmosphere and cooling, the phosphazine soon separating in yellow... 

Trimethylbismuthine, ( 113)361.—This compound may be isolated by the interaction of bismuth bromide and zinc dimethyl m dry ether solution. The ether is distilled off in a carbon dioxide atmosphere, and after treatment of the residue with caustic soda, the bis mu thine is distilled off in a current of hydrogen. 

Urea and thiourea were of especially pure grade. Tetra-n-hutylammonium (tea) hydroxide was prepared and purified as in [l3]. All the operations with it were carried out in the free from carbon dioxide atmosphere and by using boiled water. 

A measured volume of a petroleum ether extract of liver containing approximately 6 mg. of phosphatide phosphorus was evaporated just to dryness under reduced pressure in a carbon dioxide atmosphere and the residue was dissolved in methanol. Under these conditions all phosphatides were dissolved by the methanol. This was shown by phosphorus and choline determinations. The methanol solution was made to 100 ml., and 25-ml. aliquots containing approximately 0.060 mg. phosphatide phosphorus per ml. were added to 1.75 g. magnesium oxide in 50-ml. centrifuge tubes. The mixtures were allowed to stand for 25-30 minutes with frequent stirring and then were centrifuged. The methanol was poured off and the magnesium oxide was washed twice with 25-ml. portions of fresh methanol. The combined methanol supernatants were made up to 100 ml. and aliquots were taken for phosphorus and choline determinations. The results are recorded in Table XIII, which shows that the separation by this procedure is just as... 

The flame ionisation detector (FID) has been used in analytical SFC and could be used in preparative SFC by by-passing a very small fraction of the mobile phase flow through to the detector. Obviously the FID could not operate in a largely carbon dioxide atmosphere and would respond to many modifiers. The photoionisation detector (PID) has been used in analytical SFC but is better suited to highly sensitive detection of specific types of compound. 

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