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Abstract  

A simple device suitable for continuous monitoring of carbon dioxide evolved during thermal decomposition reactions is described. Carbon dioxide is transported by a carrier gas through the device connected to thermoanalytical equipment and absorbed by soda lime reagent. The reaction heat released is linearly proportional to the amount of carbon dioxide absorbed.

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A new detector was used for the continuous and selective detection of water vapour released during thermoanalytical investigations of soil samples.

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Application of continuous and selective water detector for quantitative measurements

Determination of the water content of anion-exchange resins

Journal of Thermal Analysis and Calorimetry
Authors:
J. Kristóf
and
J. Inczédy

A standard method was developed for investigation of the adsorbed water in ionexchange resins. The previously-dried anion-exchange resins in Cl, SO4 and HSO4 form were investigated by simultaneous TG, DTG and DTA measurements (derivatograph), and the evolved gases were passed through the continuous and selective water detector system developed earlier.

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Abstract  

Thermic detectors are seldom used in analytical laboratories, in spite of their advantageous properties. Their theoretical basis provides simple relations and useful equations for the design and construction of thermic liquid analyzers. In this paper a home-made detector system was used for the continuous determination of hydrochloric acid. The results were in accordance with the theoretical considerations.

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From thermoanalytical curves (DTG, TG) recorded in an oxygen atmosphere, the moisture and carbonate contents of oil-shales were determined with acceptable accuracy. The nature of the carbonates was predicted from the shape of the DTG curves above 550°C Dolomite (ankeritc) as found in Gérce oil-shale, and calcite in Pula-9 oil-shale. The clay content was determined from the signal of a water-detector recorded in a nitrogen atmosphere. The peaks at 80°C and 150°C for Gérce oil-shale were attributed to montmorillonite, and the sharp peak at 525°C for Pula-9 oil-shale to kaolinite.

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The complete oxidation of styrene-divinylbenzene has been examined with complex thermoanalytical methods by derivatograph and thermogastitrimeter. With the combined application of combustion catalyst and postcatalytic method the oxidation of the styrene-divinylbenzene is complete.

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Oxidation of three selected organic model materials, saccharose, gelatine and styrene-divinylbenzene with and without combustion catalysts, was studied with a derivatograph.

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A device suitable for the continuous detection of carbon monoxide evolved during themal decomposition processes is described. The detector can be connected directly to thermoanalytical equipment of controlled gas atmosphere. Carbon monoxide collected by the carrier gas is passed through the device containing hopcalite catalyst. In the presence of oxygen carbon monoxide is converted to carbon dioxide in the cell and the temperature change caused by the heat of reaction is measured. According to experience, the change of temperature is linearly proportional to the amount of carbon monoxide released.

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