165. Mixed vapor adsorption by activated carbons

165. Mixed vapor adsorption by activated carbons

222 Abstracts (Department of Inorganic Chemistry, University of Granada, Granada, Spain). adsorption Mata-Arjona of strontium (%r/90Y, EBmax = 2.2...

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222

Abstracts

(Department of Inorganic Chemistry, University of Granada, Granada, Spain). adsorption

Mata-Arjona

of strontium (%r/90Y, EBmax = 2.214 MeV) on activated carbons has been studied following a radiochemical technique. The activated carbons were prepared from almond shells, and characterized by adsorption of N2 (77 K) and CO1 (298 K), mercury porosimetry and ash content. The effect of equilibration time, pH, adsorbent and adsorbate concentrations and of various anions on the adsorption has been investigated. 160. Changes in the adsorption capacity of Saran carbons for some hydrocarbons by gas chromatography

I. Fernandez-Morales, A. Guerrero-Ruiz, J. LopCz-Garzbn, I. Rodriguez-Ramos and C. MorenoCastilla (Departamento de Quimica Inorgcinica, Facultad de Ciencias,

Universidad de Granada, Spain).

several Saran carbons were prepared at different temperatures in an inert atmosphere and were used as adsorbents for hydrocarbons at high temperature applying a gas chromatographic technique. The Saran carbon obtained at 1300°C behaves as molecular sieve for the couple benzene-cyclohezane. This behaviour could be interpreted like a superficial blocking of the porosity. 161. 13CNMR analysis of charcoal adsorbents H. A. Resing, V. R. Deitz and J. S. Murday (Naval Research Laboratory, Code 6122, Washington, DC 20375, U.S.A.). So called “solid-state” NMR tech-

niques achieve high resolution spectra even for solids and chemisorbed molecules. These have been applied to charcoal impregnated with triethylene diamine (TEDA) and its reaction with methyl iodide; this simulates the cleanup of radioactive CH31* from nuclear reactor off gases. Spectra of charcoal, the TEDA impregnant, of physically adsorbed methyl iodide, and of the adsorbed quaternary salt of CHJI with TEDA were recorded. 162. Variation of adsorption rate with pre-adsorbed

charcoal. The better dynamic performance of charcoal cloth, measured as a volume uptake, is related to the physical structure of the adsorbates.

164. Preparation of active cokes for the removal of SI, and NO, in the flue gases Y. Komatsubara, M. Yano, I. Shiraishi and S. Ida (Mitsui Mining Co. Ltd., l-3 Hibiki, Wakamatsu Kitakyushu 808, Japan). Preperative procedures of

active cokes which are applied for the removal of SO, and NO, in the flue gases were studied to find an optimum blending ratio of semi-coke, coal and soft pitch, the carbonization and activation conditions, since the cokes should have high mechanical strength, as well as adsorption and catalytic activities.

165. Mixed vapor adsorption by activated carbons P. J. Reucroft and R. B. Read (Department of Metallurgical Engineering and Materials Science, University of Kentucky, Lexington, KY 40506, U.S.A.). The development of predictive isotherm

equations to describe adsorption of multicomponent vapors by activated carbons has generally been hindered by the paucity of experimental data. Experimental techniques which allow determination of equilibrium mixed vapor adsorption as a function of pressure will be described.

166. Successive carbon

chlorination-hydrogenation

cycles of

Chaim Tobias and Abraham Soffer (Nuclear Research Center, Negev, POB 9001, Beer-Sheva 84190, Israel). Carbon surfaces free of surface chemibound oxygen, was chlorinated then hydrogenated at high temperatures, several times without weight loss or pore development. Chlorination proceeds mainly by exchange with chemibound hydrogen, and hydrogenation, by exchange with chemibound chlorine. Chemibound chlorine may be partially degased and readsorbed at high temperatures, leading to evidence of surface double bound creation and saturation.

moisture as measured by a pulse technique

M. E. Smith (Chemical Defence Establishment, Salisbury, Wiltshire, England). A. Bailey (Royal Military College, Shrivenham, Swindon, Wiltshire, England). Results are given to show that the penetration of pulses of strongly adsorbed vapours through charcoal beds is unaffected by pre-adsorbed moisture. It is also shown that this method of testing can be used to determine the residual life capacity of charcoal beds under humidified conditions. 163. Comparison of the adsorptive performance

of CDE charcoal cloth and granular charcoal M. E. Smith and J. A. Davies (Chemical Defence Establishment, Salisbury, Wilts, England). Results are

given to show that CDE charcoal cloth has a faster rate of adsorption and is less affected by preadsorbed moisture than a similar activity nutshell

167. Comparison of different test to evaluate the adsorptive capacity of activated carbons C. Salinas Martinez de Lecea, A. Lineares-Solano, M. Molina-Sabio, F. Rodriguez-Reinoso and C. Puente (Departamento de Quimica Inorghnica, Universidad de Alicante, Alicante, Spain). Activated carbons of very different nature have been characterized by gas adsorption and by adsorption from solution; the results have been compared with those obtained by the ethylene glycol retention method proposed by Puri. The comparison is very good mainly for active carbons with surface area around 800-1200m’ g-’ provided that they have a minimum oxygen content. However, using retention of n-nonane instead of ethylene glycol the results are similar and independent of the oxygen content.