Adsorption on Romanian natural clinoptilolite

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Separation Science and Technology

2012

Isotopic enrichment by low-temperature distillation of carbon monoxide is difficult to handle, the experiments providing with the necessary data are time-consuming and difficult to perform, so the mathematical modeling of the process is an appropriate approach to study and to further control the column. This paper develops a mathematical model for the ( 13 C) isotope cryogenic distillation process using two subsystems of the plant: the hydrodynamic part and the isotope-separation part. The model is validated using experimental data from the pilot column from the National Institute for Research and Development of Isotopic and Molecular Technologies Cluj-Napoca. The proposed model is suitable for various cryogenic distillation columns, using the proper parameters.

Section: Experimental Cryogenic Isotope Separation Principle Of Operamentioning

confidence: 99%

Systematic Modeling of the (¹³C) Isotope Cryogenic Distillation Process

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Separation Science and Technology

2012

“…In scientific research or industrial applications, the stable isotopes of O, N, C, etc are widely used [1]. In natural conditions, the ratio of concentration of the nitrogen 14 N/ 15 N is: 99.635 / 0.365 (%).…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Control of (15N) Isotope Separation Column

2006 IEEE International Conference on Automation, Quality and Testing, Robotics

Festila

2006

The chemical processes developed in the 15 N-isotope separation plant are very complex and many details are not yet known in totality. The authors are concerned with the problem of developing effective and readily implemental techniques for modelling and control of the isotope separation plant. In the present paper are presented a variant of Model Predictive Control (MPC) of the isotope separation plant. The results are validated by simulation, based on a lot of experiments.

“…Although zeolites are very good adsorbents for many gasses, a limited number of studies were reported on the adsorption of SO 2 by natural (Roux et al 1973;Valyon et al 1976;Hayhurst 1980;Kallo et al 1982;Axente et al 1983;Asenov et al 1984;Sirkecioglu et al 1995;Mihaila et al 1997;Caputo et al 2001;Demirtaş 2006;Ivanova and Koumanova 2009) and synthetic zeolites (Sharonova et al 1991;Deng and Lin 1995;Srinivasan and Grutzeck 1999;Marcu and Sȃndulescu 2004). The aim of this study is to evaluate the structural behavior and SO 2 adsorption of Bigadiç clinoptilolite-rich zeolite and those of modified forms.…”

mentioning

confidence: 97%

Influence of the exchangeable cations on SO2 adsorption capacities of clinoptilolite-rich natural zeolite

2011

The sulfur dioxide adsorption on clinoptiloliterich tuff from Bigadiç region of Western of Turkey and its modified forms (Na + , K + , Ca 2+ and Mg 2+ ) have been studied at 273 K and 293 K up to 100 kPa. The structural properties of clinoptilolites were studied by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR). The quantitative XRD analysis demonstrated that the Natural-B sample is mainly constituted by clinoptilolite (80-85%) with minor contents of quartz (7-8%), feldspar (5-6%) and mica-illit (4-5%). It was found out that the adsorption capacity and the affinity of SO 2 with clinoptilolite samples depended mainly on the type of exchanged cations and decreased as Na-B > K-B > Mg-B > Natural-B > Ca-B for both temperature. These results show that clinoptilolite-rich zeolites are considered potentially good adsorbents for SO 2 removal.