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operators [ 5 ]. More studies concerning CHP were focused on reactive hazard and runaway reaction [ 6 – 8 ]. This study was used to analyze the effect of stirring rate for a runaway reaction in a batch reactor. Differential scanning calorimetry (DSC

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Abstract  

In this paper, it has been carried out a study to analyze the effect of the stirring velocity in the experimental determination of the mixture enthalpies of several binary mixtures by using a Titration Calorimetric TAM2277-201/2250 by Thermometric AB. The tested liquid mixtures have been ethanol+water and those containing 1-methyl-2-pyrrolidone and (ethanediol, 1,2-propanediol or 1,2-butanediol). The stirring aim is to keep the homogeneity in the mixture process, but the stirring velocity must not be increased in excess in order not to favour the evaporation during the measurement process. This study reveals that every mixture process shows an optimum stirring velocity.

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The method of agitation has a great influence on the kinetics of adsorption of cobalt by synthetic geothite /-FeOOH/ suspended in 10–2 mol l–1 NaCl at pH 7. Three methods of agitation were compared, reciprocating shaking, continuous stirring and intermittent stirring, and only with the latter was equilibrium achieved. This suggests that in sorption systems with a solid phase subject to aggregation of particles the breakdown of aggregates can be prevented by intermittent stirring.

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This paper explains why directly agitated test cells are sometimes required in order to obtain good adiabatic calorimetry data that can be used with confidence to predict large scale plant behaviour. Experiments for methyl methacrylate polymerisation are reported. Simple procedures are presented for calculating genuine thermo-kinetic parameters from data which includes energy dissipation from the stirrer drive system.

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) slowly in a vigorously stirred reactor to control the reaction rate and heat release by dosage, stirring rate, temperature, and pressure [ 6 ], then diluted with dimethyl phthalate (DMP) [ 7 ]. MEKPO has led to many incidents that are attributed to poor

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of the hydrogen pressure, stirring rate, and the hydrogenation temperature on enantioselectivity were examined using the tartaric acid and NaBr modified Raney nickel catalyst. Experimental The GLC measurements for

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/H 2 O 2 1:1–5:1, solvent concentration (methanol) of 5–90 wt%, catalyst content of 0–5.0 wt%, reaction time of 5–300 min and the intensity of stirring 0–500 rpm. In order to calculate the mass balance for the syntheses performed, the post

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) was transferred to a sample vial (12 mL) containing a magnetic stirring bar (15 mm × 5 mm). HCl (10 μL, 0.1 M) as the acceptor phase (AP) was withdrawn using a 25-μL Hamilton microsyringe (model 702SNR). The microsyringe needle and needle tip (21G × 38

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Sprout damage in durum wheat ( Triticum turgidum L. var. durum ) is caused by pre-harvest sprouting. It reduces seed quality and causes a loss of starch gel viscosity, which negatively affects the pasta industry. The objectives of this research were to study the relationship between sprouting score and sprout damage in two durum wheat populations grown at Langdon, and Prosper, ND, to test the sensitivity of the stirring number test compared with the falling number test for estimating sprout damage, and to evaluate the effect of cutting date on sprout damage. A negative correlation between sprouting and sprout damage was detected in both populations. The stirring number test was more sensitive than the falling number method, but the two tests were positively correlated when sprouted and sound seeds were used. Cutting date did not significantly affect sprouting score. There was no significant cutting date × genotype interaction. Viscosity loss due to sprouting was complete in the two populations.

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Abstract  

The paper describes the application of extraction chromatography to the determination of several alpha and beta emitters in biological and environmental samples. Both column extraction chromatography and batch extraction process have been used to isolate the radionuclides from the samples. The effect of several parameters (extractant concentration, support granulometry, stirring time, temperature, presence of a complexing agent) on the extraction and elution has been examined. The application of redox extraction chromatography is also described.

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