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Sodium sulfide

About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.


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Patent
13 Aug 1993
TL;DR: In this article, a process for the production of alkali metal hydroxides, such as caustic soda, and elemental sulfur, characterized in that to an electrochemical cell an aqueous solution of an alkaline metal sulfide, e.g., sodium sulfide is fed in order to cause the following reations to take place: (1) at the anode Na₂S + 2H ₂O ---> 2NaOH + S + H + 2e = S.
Abstract: The present invention relates to a process for the production of alkali metal hydroxides, such as caustic soda, and elemental sulfur, characterized in that to an electrochemical cell an aqueous solution of an alkali metal sulfide, e.g., sodium sulfide, is fed in order to cause the following reations to take place: * at the anode Na₂S ---> 2Na⁺ + S + 2e⁻ * at the cathode 2H₂O + 2e⁻ ---> 2OH⁻ + H₂ with the overall reaction being thus the following: Na₂S + 2H₂O ---> 2NaOH + S + H₂. Elemental sulfur, which is insoluble, is recovered from the anodic solution by filtration. The NaOH solution is extracted from the cathodic compartment by means of the addition of water. The concentration of the solution of alkali metal hydroxide obtained is a function of the characteristics of the membrane used. In the disclosed process, the standard potential of the anodic reaction: S²⁻ - 2e = S⁰ is lower than of the corresponding processes which lead to the development of gases (Cl₂, O₂), thereby an adavantageous decrease in cell voltage being made possible.

10 citations

Journal ArticleDOI
TL;DR: In this article, aldol condensation reaction of β-chlorovinylaldehydes (carbonyl component) with acetone or α-methylene ketones (methylene component) followed by nucleophilic substitution reaction of the chlorine atom in the 4-acyl-1-chloro-1,3-butadienes by means of sodium sulfide and further cyclization of the resulting 4acyl -1-mercapto- 1,3 -butadiens is performed.
Abstract: 2-Alkylthiopyrylium salts are available in good yields via aldol condensation reaction of β-chlorovinylaldehydes (carbonyl component) with acetone or α-methylene ketones (methylene component) followed by nucleophilic substitution reaction of the chlorine atom in the 4-acyl-1-chloro-1,3-butadienes by means of sodium sulfide and further cyclization of the resulting 4-acyl-1-mercapto-1,3-butadienes

10 citations

Journal ArticleDOI
TL;DR: In this article, the adsorption of heptyl xanthate (KHX) at the surface of zinc sulfide and Pb(II) activated ZnS were examined as a function of time using continuous online in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the possibility of reactivating partially deactivated skeletal nickel was systematically studied for the first time, and it was found that its activity in liquid-phase hydrogenation reactions can be regulated by the introduction of a catalyst poison in small amounts into the system.
Abstract: The kinetics of the liquid-phase hydrogenation of sodium maleate on skeletal nickel catalysts subjected to controlled deactivation with sodium sulfide solutions was studied. The possibility of reactivating partially deactivated skeletal nickel was systematically studied for the first time, and it was found that its activity in liquid-phase hydrogenation reactions can be regulated by the introduction of a catalyst poison in small amounts into the system.

10 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202325
202233
202136
2020107
2019143
2018172