Reference

Oxidation of phosphorus compounds by Fenton's reagent

Oxidation of phosphorus compounds by Fenton's reagent. Petrucci, Elisabetta; Di Palma, Luca; Merli, Carlo (Dipartimento di Ingegneria Chimica, dei Materiali, delle Materie Prime e Metallurgia, Universita di Roma "La Sapienza", Rome 00184, Italy). Annali di Chimica (Rome, Italy), 93(11), 935-945 (English) 2003 Societa Chimica Italiana. CODEN: ANCRAI. ISSN: 0003-4592. DOCUMENT TYPE: Journal CA Section: 60 (Waste Treatment and Disposal) Fenton's treatment for the oxidn. of a P compds. mixt., simulating a match manufg. industry wastewater, were studied. Exptl. tests were performed on 3 sample solns. at a P concn. of 250, 500 and 750 mg/L. In each soln. an equal amt. 15475-67-9 and 7723-14-0 are cas registry numbers of chemicals which are used as reagents here. of Na phosphite and Na hypophosphite was dissolved. The study of pH, temp. and reagents ratio on the oxidn. rate led to the individuation of the optimal process operating conditions. The results show that Fenton's reagent provides a powerful conversion to phosphate of the P soln. In particular at pH 3.5 and 20° a residual concn. of non-oxidized P in compliance with the Italian regulation limits for industrial wastewater disposal. Tests performed on sample soln. of 500 and 750 mg P/L by adding H2O2 and divalent Fe in 3 sequential steps led to similar reaction efficiencies to tests carried out adding both Fenton's reagents in one step, but with a remarkably lower reagents consumption. .

Control of chaotic oscillations in the process of crystallization via extended method of time-delayed feedback

All Rights Reserved. Control of chaotic oscillations in the process of crystallization via extended method of time-delayed feedback. Koltsova, E. M.; Cherenkov, M. V. (Dep. of Cybernetics of Chemical Technological Processes, Mendeleev Univ. of Chemical Technology of Russia, Moscow 125047, Russia). International Conference on Physics and Control, Proceedings, St. Petersburg, Russian Federation, Aug. 24-26, 2005, 351-354. Edited by: Fradkov, A. L.; Churilov, A. N. Institute of Electrical and Electronics Engineers: New York, N. Y. ISBN: 0-7803-9234-5(English) 2005. CODEN: 69IRP7. DOCUMENT TYPE: Conference CA Section: 65 (General Physical Chemistry) An algorithm of control of chaotic oscillations in the process of continuous mass crystn. of dibasic lead phosphite via extended method of time-delayed feedback is offered. Domains of values of parameters of time-delayed feedback function were detd.Except for chemicals metioned above, 15475-67-9 and 127-09-3 are also used. for stabilization of unstable fixed points of cycles of periods-2 and -4 of logistic map. .