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•
19 Oct 1994
TL;DR: In this paper, a method of processing white liquor (3) obtained from the causticization step of a pulp mill, in which the infeed white liquor principally contains sodium hydroxide (6) and sodium sulfide (7), was described.
Abstract: The present invention relates to a method of processing white liquor (3) obtained from the causticization step of a pulp mill, in which method the infeed white liquor (3) principally contains sodium hydroxide (6) and sodium sulfide (7). The method according to the invention is characterized in that the sodium hydroxide (6) contained in the white liquor (3) is separated from the white liquor (3) either entirely or partly by means of a diffusion dialysis process (4). The invention is further characterized in that the sodium hydroxide (6) separated from the white liquor (3) is advantageously entirely returned back to the chemical circula-tion of the pulp mill.
6 citations
TL;DR: In this article, an equilibrium between the chair and boat conformations in the thiopyranone ring was found in CDCl3 solutions of 7-(2-hydroxyethyl)-1,5-dimethyl-3-thia-7-azabicyclo[3.3.1]nonan-9-one at 50°
Abstract: Thiomethylation of pentan-3-one, 5-methylhexan-3-one, and heptan-4-one with a mixture of formaldehyde and sodium sulfide gave the respective 3,5-dialkyltetrahydro-4H-thiopyran-4-ones, while 3,5-dihydroxymethyl- or 3,5-dialkyl-5-hydroxymethyltetrahydro-4Hthiopyran-4-ols were formed in the presence of primary amines. The oxidation of 3,5-dimethyltetrahydro-4H-thiopyran-4-one with an equivalent amount of hydrogen peroxide in tetrahydrofuran and chloroform led to the sulfoxide and sulfone, respectively, while aminomethylation with a mixture of formaldehyde and methylamine, hexylamine, monoethanolamine, or hydrochlorides of methyl, ethyl, and 2-propyl esters of aminoacetic acid at рH 7–8 produced the respective 1,5-dimethyl-3-thia-7-azabicyclo[3.3.1]nonanes. An equilibrium between the chair and boat conformations in the thiopyranone ring was found in CDCl3 solutions of 7-(2-hydroxyethyl)-1,5-dimethyl-3-thia-7-azabicyclo[3.3.1]nonan-9-one at 50°С and DMSO-d
6 solutions of 1,5,7-trimethyl-3-thia-7-azabicyclo[3.3.1]nonan-9-one monoperchlorate at 20°С.
6 citations
TL;DR: A broad range of functionalized aryl, hetaryl, and alkyl aldehydes react with N-substituted or N,N-disubstitized formamides and sodium sulfide to form the corresponding thioamides in moderate to high yields.
Abstract: A broad range of functionalized aryl, hetaryl, and alkyl aldehydes react with N-substituted or N,N-disubstituted formamides and sodium sulfide to form the corresponding thioamides in moderate to high yields.
6 citations
TL;DR: The terminal enynes 10−12 were prepared from corresponding aldehydes 6−8 by applying conventional methods of acetylene chemistry as discussed by the authors, and these building blocks were subsequently oxidatively dimerized (Glaser coupling) to the sterically protected oligoenynes 22−25; McMurry coupling of 13 yielded 26 as a mixture of diastereomers.
6 citations
Patent•
06 Oct 2010
TL;DR: In this article, a synthetic method for the quantum dots comprises the following steps of: firstly, preparing an admium telluride quantum dot with excellent fluorescent characteristic by hydrolyzing a sulfhydryl group; secondly, adding thiourea with a certain concentration into the reacted admium tellsuride solution, forming free suplfur ions released by slowly hydrolyzed and photolyzing thiousrea and cadmium ion dangling bonds existing on the surface of the admium tellinguride into bonds; generating a thin Cadmium sulfide casing
Abstract: The invention relates to a synthetic method of admium telluride/cadmium sulfide/zinc sulfide quantum dots. An inner core is an admium telluride quantum dot and is coated by cadmium sulfide and zinc sulfide in sequence. The synthetic method for the quantum dots comprises the following steps of: firstly, preparing an admium telluride quantum dot with excellent fluorescent characteristic by hydrolyzing a sulfhydryl group; secondly, adding thiourea with a certain concentration into the reacted admium telluride solution, forming free suplfur ions released by slowly hydrolyzing and photolyzing thiourea and cadmium ion dangling bonds existing on the surface of the admium telluride quantum dot into bonds; generating a thin cadmium sulfide casing layer on the surface of the cadmium sulfide quantum dot; and finally adding a zinc acetate solution and a sodium sulfide solution into the admium telluride/cadmium sulfide quantum dots with nuclear shell structures and carrying out hydro-thermal growth in a polytetrafluoroethylene digestion tank to form the admium telluride/cadmium sulfide/zinc sulfide quantum dots. The quantum dots have the characteristics of high fluorescent strength, favorable stability, high quantum yield and low biotoxicity and are hopeful to be applied to the field of biomarkers instead of the traditional organic dye. The synthetic method has the advantages of simple process, convenience, low cost and strong operability.
6 citations