Continuous Determination of Ammonia Activity in Ammoniacal Solutions

Brown, Earl H.; Cline, J.E.; Felger, Maurice M.; Howard, R. Bowen

doi:10.1021/i560141a003

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…To remove from the nitrogen all traces of oxygen, whether present as such or in the form of water or carbon dioxide, a purification system was used consisting of: (1) a suitable length of a.Vycor or Pyrcx glass microcombustion tube containing a 10-cm. section of copper grit (40-to 60-mesh) or ribbon mounted vertically to avoid channeling of the filling and maintained at about 500°C.…”

Section: Apparatusmentioning

confidence: 99%

“…Iodine Pentoxide-Vanadium Pentoxide. This oxidation tube filling is prepared as described by Brown and Felger (1), except that 20to 30-mesh Armstrong A-25 insulating brick is used instead of 9-to 14-mesh. With this filling, a temperature of 110-111°C.…”

Section: Apparatusmentioning

confidence: 99%

“…Figure 1. Diagram of Apparatus for Direct Determination of Oxygen in Organic Compounds require a high temperature to proceed quantitatively, an essential requirement is a furnace capable of continued operation above 1000°C.…”

mentioning

confidence: 99%

“…MB + S-+ 2 H20 -2 HMB + 2 OH-+ S°( 1) where MB represents methylene blue and HMB represents the leuco form of methylene blue.As an excess of sulfide ion is present, the free sulfur formed (Equation1) is dissolved by formation of polysulfide:S» + S--> [S . .…”

mentioning

confidence: 99%

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Oxygen in Organic Compounds

Aluise¹,

Hall²,

Staats³

et al. 1947

Anal. Chem.

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The promising micromethod of Unterzaucher for the direct determination of oxygen in organic compounds has been investigated. The procedure involves pyrolysis of the compound in a stream of nitrogen and conversion of all the oxygen in the pyrolysis products to carbon monoxide over carbon at 1120°C.The carbon monoxide is oxidized to carbon dioxide by iodine pentoxide, and the equivalent amount of iodine liberated is determined titrimetrically. A furnace meeting the high-temperature requirements is described. Criteria are presented for the selection of carbon which gives quantitative conversion of the oxygen to carbon monoxide, and iodine pentoxide for quantitative oxidation of the carbon monoxide.The results obtained to date in this laboratory show over-all precision and accuracy somewhat less than those now obtained in carbon and hydrogen analyses. The method, however, possesses several outstanding advantages over other methods for oxygen determination, in that the apparatus is somewhat less elaborate, the presence of other compounds, such as sulfur, nitrogen, and halogens, has no effect on its applicability, and catalyst poisoning does not present a problem.ALTHOUGH oxygen is one of the most commonly occurring il constituents in organic compounds, there is, at present, no entirely satisfactory method for its direct determination. The lack of such a method is clearly emphasized in the recent excellent review by Elving and Ligett ($), who present a critical examina-

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Section: Apparatusmentioning

confidence: 99%

Section: Apparatusmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Oxygen in Organic Compounds

Aluise¹,

Hall²,

Staats³

et al. 1947

Anal. Chem.

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“…The complete analyzer is shown in Figure 1. The pressure stabilizer, P (6), gives a constant operating pressure and is adjusted so that the rate of leakage around the piston reduces the time Sag in the sample line to 15 seconds or less. Valve V and flowmeter F are used to regulate the rate of gas flow through the train.…”

Section: Operating Principlementioning

confidence: 99%

Determination of Oxides of Carbon in Hydrogen-Nitrogen Mixtures Continuous Determination of Minute Concentrations by Eiectroconductivity

Brown¹,

Felger²

1945

Ind. Eng. Chem. Anal. Ed.

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An electroeonductometric analyzer for the continuous, separate, or simultaneous determination of carbon dioxide and carbon monoxide in concentrations of 0 to 100 p.p.m. in hydrogen-nitrogen mixtures and the application of the analyzer to the analytical control of the TVA synthetic ammonia plant are described. An absorptionconductivity cell of new design and a recording alternating current Wheatstone bridge are employed. Carbon monoxide, after oxidation by an improved iodine pentoxide reagent, is determined as carbon dioxide. Full operating details are given.

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Chromatographie

Rauen¹

1953

Allgemeine Untersuchungsmethoden

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Continuous Determination of Ammonia Activity in Ammoniacal Solutions

Cited by 9 publications

References 10 publications

Oxygen in Organic Compounds

Oxygen in Organic Compounds

Determination of Oxides of Carbon in Hydrogen-Nitrogen Mixtures Continuous Determination of Minute Concentrations by Eiectroconductivity

Chromatographie

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