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.
Papers published on a yearly basis
Papers
More filters
Patent•
23 Aug 1989
TL;DR: Disclosed as discussed by the authors is a process for preparing crystals of anhydrous sodium sulfide, the process being characterized in that the process comprises the steps of heating crystals of polyhydrate of poly sulfide under a pressure of about 500 torr or less at a temperature varying not more than ± about 10° C. for about 2 hours or longer.
Abstract: Disclosed is a process for preparing crystals of anhydrous sodium sulfide, the process being characterized in that the process comprises the steps of heating crystals of polyhydrate of sodium sulfide under a pressure of about 500 torr or less at a temperature varying not more than ±about 10° C. from the phase transition point between polyhydrate crystals and monohydrate crystals of sodium sulfide for about 2 hours or longer and further heating the monohydrate under atmospheric or reduced pressure at about 90° to about 200° C. for about 2 hours or longer.
17 citations
Patent•
20 Jun 1988
TL;DR: In this paper, a process for producing polyarylene sulfide of high purity and high molecular weight by contacting a dihalogeno aromatic compound with an alkali metal sulfide in a polar solvent is described.
Abstract: Disclosed is a process for producing stably a polyarylene sulfide of high purity and high molecular weight by contacting a dihalogeno aromatic compound with an alkali metal sulfide in a polar solvent which comprises, as a first stage, reacting a dihalogeno aromatic compound with an alkali metal sulfide in a polar solvent in the presence of a lithium compound and in the presence of substantially no water at 200°-270° C. with concentration of remaining alkali metal sulfide being 5.5 g/l-polar solvent or less in terms of sulfur; then adding water in an amount of 1.0-10 mols per 1 mol of said alkali metal sulfide; and, thereafter, as a second stage, carrying out the reaction at 220°-280° C. Preferred dihalogeno aromatic compound is p-dichlorobenzene, preferred alkali metal sulfide is sodium sulfide and/or lithium sulfide and preferred lithium compound is lithium chloride and/or lithium sulfide.
17 citations
TL;DR: In this paper, the authors investigated how the property of third phase affects the reaction rate in a phase transfer catalytic reaction system and found that the third phase was more easily formed as the concentration of sodium sulfide in the aqueous phase and the temperature increased.
Abstract: The purpose of this study is to investigate how the property of third phase affects the reaction rate in a phase transfer catalytic reaction system. Dibenzyl sulfide was produced by the reaction between sodium sulfide in an aqueous phase and benzyl chloride in an organic phase by using tetrahexylammonium bromide ((Hex) 4 NBr) as a phase transfer catalyst. As the concentration of sodium sulfide in the aqueous phase and the temperature increased, the third phase was more easily formed. Three types for temperature dependencies on the reaction rate were observed. The reaction rate in one type initially increased, suddenly decreased, and then increased again. The other reaction rates in two types increased with the increase in temperature but the difference between them was 20–50 times at the same temperature. These behaviors could be explained by the property of third phase, especially, the lipophilicity or the hydrophilicity.
17 citations
TL;DR: In this article, a trimeric-s-triazine containing three amino zinc(II) phthalocyanines has been prepared by following the multistep reactions of unsymmetrical substituted phTHCyanines.
17 citations
TL;DR: In this article, the SS type of the Smiles rearrangement (3′-quinolinethiolate 2A4′-quinolinetiolate 3A) was used to give 4,4-dialkylthio-3,3-diquinolinyl sulfides 3 as the final products.
17 citations