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.

Influence of nucleophilic reagents on the reactions of phosphorus sulfides and alkyl homologues of davy's reagent with alkyl halides and dialkyl disulfides

Abstract: Use of potassium carbonate, sodium sulfide and sodium alkylthiolates results in the reactivity enhancement of phosphorus sulfides (P4S10, P4S7 and P4S5) and alkyl homologues of Davy's reagent in their reactions with alkyl halides and dialkyl disulfides.

Systems S-Na 2 O-H 2 O and S-H 2 O--Application to the mode of origin of natural alkaline polysulfide and thiosulfate solutions

Abstract: S reacts with aqueous NaOH to form sodium sulfide and sodium thiosulfate; in the presence of excess S the polysulfide complex ion S x = forms, where "x" is approximately 5. The saturation concentrations of S in aqueous NaOH solutions allowed to react with excess of orthorhombic S have been determined at 25 degrees C. and one atmosphere pressure. Inasmuch as alkaline aqueous solutions are known to exist in nature, the reaction of S with NaOH solutions suggests a possible mode of origin of natural sodium polysulfide and thiosulfate solutions. Alkaline aqueous solutions encountering elemental S would react to produce sodium polysulfide and sodium thiosulfate, substances which are capable of forming soluble complex ions with ore-forming substances.

Highly sensitive spectrophotometric reaction rate method for the determination of selenium based on the catalytic reduction of sulfonazo by sulfide

Abstract: A sensitive and rapid kinetic spectrophotometric method was developed for the determination of ultratrace amounts of selenium [Se (VI), Se (IV), and total selenium]. The method is based on the catalytic effect of Se (IV) on the reduction of sulfonazo by sodium sulfide. The reaction was followed spectrophotometrically by measuring the decrease in absorbance at 570 nm for the reaction mixture or by measuring the increase in absorbance of the reaction mixture at 680 nm and at 25°C, by the fixed‐time method. Selenium could quantitatively be determined in the range of 0.5–180 and 50–2300 ng mL−1 at 680 and 570 nm, respectively. The limit of detection is 0.3 ng mL−1 Se (IV) at 680 nm. All of the variables that affect the sensitivity in the two wavelengths were investigated, and the optimum conditions were established. The interference effect of various cations and anions on the Se (IV) determination was also studied. The selectivity of the selenium determination was greatly improved with the use of the...

Recovery of alkali values from trona ore

Abstract: Alkali values are recovered in a cyclic method from mechanically mined trona ore or from trona deposits by a solution mining technique utilizing a solvent comprising an aqueous solution of sodium sulfide. The ore is solubilized as sodium carbonate which is precipitated as sodium sesquicarbonate and/or sodium bicarbonate by treating the solution with hydrogen sulfide and the precipitated salt separated from the mother liquor. In the process, sodium sulfide and hydrogen sulfide become converted into sodium hydrosulfide which is contained in the mother liquor. Heat treatment of the mother liquor converts the sodium hydrosulfide into sodium sulfide thereby regenerating a solution of sodium sulfide which is recycled to the trona ore and into hydrogen sulfide which is evolved and recycled to the sodium carbonate solution.