Industrial Manufacturing of Aqueous Solutions of Sodium Sulfhydrate (NaHS 43%) in a Multi-Phase Reactor



Warren Reátegui-Romero1, *, Fredy Castillejo-Melgarejo 1, 2, María E. King-Santos1
1 Faculty of Chemical Engineering and Textile(FIQT)- Universidad Nacional de Ingeniería (UNI), Lima Peru
2 Reactivos Nacionales S.A. Company, Lima Peru

Abstract

Background:

This research deals with the manufacture of sodium sulphides and sodium sulfhydrate in an isothermal multiphase chemical reactor to produce concentrated aqueous solutions of sodium sulfhydrate (greater than 43%) through Gas-Liquid-Solid reactions from hydrogen sulfide and hydroxide of sodium at 50%.

Methods:

A method is proposed that integrates the recovery of hydrogen sulfide from an industrial chemical process where the H2S gas is generated as a sub product, the strategy of the developed process was integrated into a manufacturing plant of dithiophosphoric acids (ADTF) where it was possible to recover the hydrogen sulfide in the form of an aqueous solution of NaHS with a concentration higher than 43%.

Results:

The experimental tests showed that the biphasic reaction mixture formed by Na2S, NaHS and H2O with global compositions of 13.3%; 26.9% and 59.7% respectively, is appropriate to obtain 43% sodium sulfhydrate in a stirred tank reactor, operated at temperatures ranging from 50 oC to 55 oC, where gaseous hydrogen sulfide is continually bubbled.

Conclusion:

Sodium sulfide (specifically Na2S.5H2O crystals) of the biphasic mixture is produced from a solution of sodium sulfhydrate (43% NaHS) and aqueous sodium hydroxide (50% NaOH). The environmental problem generated by the H2S was solved with a 90% recovery in the multiphase reactor and 5% in the safety absorber.

Keyword: Sodium hydrosulphide (NaHS), Multiphasic reactors, Sodium sulphide and Hydrogen sulfide(H2S), Reactivos Nacionales S.A.


Abstract Information


Identifiers and Pagination:

Year: 2019
Volume: 13
Publisher Item Identifier: EA-TOCENGJ-2018-12

Article History:

Received Date: 04/12/2018
Revision Received Date: 13/04/2019
Acceptance Date: 17/04/2019
Electronic publication date: 17/05/2019
Collection year: 2019

© 2019 Reátegui-Romero et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Correspondence: Address correspondence to this author at the Faculty of Chemical Engineering and Textile(FIQT)- Universidad Nacional de Ingeniería (UNI), Lima Peru;
E-mail: wreategui@uni.edu.pe