Topic
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•
08 Sep 2010
TL;DR: In this article, a production technology of sodium sulfide with high purity white crystals was described, which solved the problems that high purity crystals can not be obtained by treatment of evaporation or settling agent adopted by a manufacturer at present.
Abstract: The invention relates to a production technology of sodium sulfide, in particular to a production technology of sodium sulfide with high purity white crystals, solving the problems that because sodium sulfide solution compounded by barium sulfide and the sodium sulfide still contains a little metal sulfide impurities, and high purity crystals can not be obtained by treatment of evaporation or settling agent adopted by a manufacturer at present. The production technology is characterized by comprising the following steps of firstly, adding hard water in the sodium sulfide solution, regulating a pH value to be 7.5, sequentially adding PAN chelant and active carbon, and heating the solution to boiling after settlement separation; secondly, heating and evaporating the solution until the pH value is 9.5, adding barium sulfide reagent, evaporating the solution to the CMC (Critical Micelle Concentration) concentration after separation, adding the barium sulfide reagent, evaporating the solution until the content of the sodium sulfide is 52-60 percent, and cooling and stirring until complete crystallization. The invention carries out chemical reagent treatment in the evaporation process after chemical reagent treatment on the sodium sulfide solution containing impurities, therefore, the purity and the quality thereof are greatly enhanced.
6 citations
Patent•
03 Jul 1984
TL;DR: In this article, a polyphenylene sulfide comprising a structural unit of formula II is produced by reacting a p-dihalobenzene with the above sulfur source in an amide-type organic polar solvent (e.g., N-methylpyrrolidone).
Abstract: PURPOSE:To produce polyphenylene sulfide of excellent heat stability while preventing the polymer from being degraded during polymerization, by reacting a p-chlorobenzene with a specified sulfur source in an amide-type organic polar solvent. CONSTITUTION:Use is made of a sulfur source which contains below 1mol% polysulfide of formula I (wherein M is an alkali (alkaline earth) metal; Y>=1, and X is 2 when M is an alkali metal, or 1 when M is an alkaline earth metal), e.g., sodium sulfide or sodium hydrosulfide. Namely, a polyphenylene sulfide comprising a structural unit of formula II is produced by reacting a p-dihalobenzene (e.g., p-dichlorobenzene) with the above sulfur source in an amide-type organic polar solvent (e.g., N-methylpyrrolidone).
6 citations
Patent•
26 Apr 2019
TL;DR: In this article, a preparation method of a cobalt-based bimetallic sulfide negative electrode material (M-Co-S, M = Ni, Fe, Mo, Bi, Zn) was described.
Abstract: The invention discloses a preparation method of a cobalt-based bimetallic sulfide negative electrode material (M-Co-S, M = Ni, Fe, Mo, Bi, Zn) and application of the cobalt-based bimetallic sulfide negative electrode material in a water system supercapacitor. Foamed nickel with graphene on the surface is used as a substrate, cobalt salt is used as a cobalt source, M salt is used as an M source, ammonium fluoride and hexamethyltetramine are used as precipitators, sodium sulfide is used as a vulcanizing agent, an M-Co-S film is obtained through a two-step hydrothermal method, and the M-Co-S is uniformly coated on the surface of the foamed nickel substrate with the graphene. The prepared M-Co-S material is assembled into a three-electrode system, electrochemical performance evaluation is conducted in a 1M KOH electrolyte, the maximum specific capacitance of the M-Co-S material is up to 2.6 F/cm (1625 F/g) and higher than that of common negative electrode materials, and the M-Co-S is asupercapacitor negative electrode material with great application prospects.
6 citations
TL;DR: Cadmium sulfide (CdS) nanoparticles were synthesized from CdSO4, NaOH, and Na2S dissolved into distilled water, and the resulting solut...
Abstract: Cadmium sulfide (CdS) nanoparticles were synthesized from cadmium sulfate (CdSO4), sodium hydroxide (NaOH), and sodium sulfide (Na2S) dissolved into distilled water, and the resulting solut...
6 citations
20 Feb 2015
TL;DR: Wang et al. as mentioned in this paper showed that fractional precipitation flotation could not only remove Hg2+ and Pb2+ from wastewater, but also could recover mercury and lead effectively.
Abstract: The wastewater containing Hg2+ and Pb2+ does great harm to the environment and human bodies. Traditional wastewater treatment cannot fundamentally put a stop to heavy metals pollution for producing secondary pollution. In this paper, Hg2+ and Pb2+ in wastewater were removed and recovered by sulfide precipitation-flotation. Sodium sulfide was used as precipitant and butyl ammonium aero float was used as collector. Results indicated that Hg2+ and Pb2+ could be reduce to less than 0.03mg/L and 0.16mg/L respectively by both coprecipitation-floatation and fractional precipitation-floatation. In these two methods, fractional precipitation flotation could not only remove Hg2+ and Pb2+ from wastewater, but also could recover mercury and lead effectively. The infrared spectrograms showed that the adsorption between butyl ammonium aerofloat and mercury precipitate or lead precipitate is chemisorption.
6 citations