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



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%.


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%.


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.


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: 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;