Bibliographic citations
Castillejo, F., (2017). Diseño de un reactor multifásico aplicado a la fabricación de sulfuros y sulfhidrato de sodio a partir de corrientes residuales de H2S [Tesis, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/17702
Castillejo, F., Diseño de un reactor multifásico aplicado a la fabricación de sulfuros y sulfhidrato de sodio a partir de corrientes residuales de H2S [Tesis]. : Universidad Nacional de Ingeniería; 2017. http://hdl.handle.net/20.500.14076/17702
@mastersthesis{renati/710031,
title = "Diseño de un reactor multifásico aplicado a la fabricación de sulfuros y sulfhidrato de sodio a partir de corrientes residuales de H2S",
author = "Castillejo Melgarejo, Fredy Efraín",
publisher = "Universidad Nacional de Ingeniería",
year = "2017"
}
The emissions of gaseous pollutants containing hydrogen sulfide (H2S) are one of the most important environmental issues facing the chemical industries and especially in those industries whose result of chemical processes generate H2S gas or manipulate compounds derived from bivalent sulfur that end decomposing in H2S. One method of controlling this substance consists of transforming into stable compounds with commercial value such as, for example, salts and stable aqueous solutions of sodium sulphide (Na2S) and sodium sulfhydrate (NaHS), which is the subject of the present study. It has been found in this investigation that the main disadvantage for the manufacture of sodium sulfhydrate at concentrations higher than 40% by weight, and starting directly from sodium hydroxide, is the formation of sodium sulfide crystals (Na2S.5H2O, Na2S. 9H2O and others) due to its low solubility and that do not allow to obtain sodium sulfhydrate safely and efficiently in stirred tank reactors, even presents problems when treated in packed towers. In this study, a broad set of experiments was carried out that allowed us to have a clear knowledge about the formation of concentrated sodium sulfhydrate in multiphase Gas-Liquid-Solid reactors mechanically agitated. The production of sulfides, specifically sodium sulfides, in an isothermal multiphase chemical reactor to produce concentrated aqueous solutions of sodium sulfhydrate greater than 40% (NaHS at 42% - 45%) from Gas-Liquid-Solid reactions has been studied. The research proposes a process that allows integrating the recovery of hydrogen sulfide in processes where H2S is handled as an undesired sub product, such that the process strategy developed has been integrated into a manufacturing plant of dithiophosphoric acids, wherever managed to recover the hydrogen sulphide, in the form of NaHS to 43%, with a yield of more than 95%. The experimental tests show that the biphasic reaction mixture formed by the species and in the proportions of: 13,3% of Na2S; 26,9% of NaHS and 59,7% of water. This biphasic composition is suitable for obtaining sodium sulphide at 43% in a stirred tank reactor operated at temperatures ranging from 50 °C to 55 °C where gaseous hydrogen sulfide is continually bubbled.
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