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.

Production of polyarylene sulfide

Abstract: PURPOSE:To produce the titled compound without causing clogging of pipes, etc., by using simple equipment, by reacting a dihaloaromatic compound with an alkali metal sulfide in a solvent in an agitation tank of a specified structure and evaporating liquid components from a reaction slurry in the same tank. CONSTITUTION:A dihaloaromatic compound (e.g., p-dichlorobenzene) is polycondensed with an alkali sulfide (e.g., sodium sulfide in a solvent in an agitation tank equipped with an impeller of a diameter corresponding to 80-99% of the inside diameter of the tank and provided with heating and cooling means. After completion of the reaction, a liquid component is evaporated from the reaction slurry in the same agitation tank to separate a solid component, and a given amount of pure water is added to the solid component to dissolve the alkali metal halide contained in the solid in water. The mixture is centrifuged to produce a polyarylene sulfide. By recovering a solvent subsequently to the reaction in the same agitation tank, the titled compound can be produced with simple equipment without any trouble, such as clogging of pipes during transfer of the reaction product and the recovered solvent can be purified when the vaporized component is fractionated in an attached distillation tower.

Processing for granular sodium sulfide

Abstract: A process for producing particulate sodium sulfide, comprises selecting raw material-forging-heat melting-defecating and washing-removing impurities chemically-precipitating-evaporating and concentrating and so on Concentrated sodium sulfide is stored in a reactor or a blender, the content there of is equal to or higher than 60% Sodium sulfide is pumped, impurities are filtered by a filter, thesolution of sodium sulfide entering in a particle machine is at the temperature of 130-150degree C, the transmission pressure of 03-05Mpa After ejecting by a nozzle, the solution is cooling and molding in a steel-tape cooler Solidified particles are unloaded into a feed stock, and are hermetically packed by vacuum packing or plastic bags, then final product is obtained The process of producing particulate sodium sulfide is advanced and reasonably designed The invention provides conditions and devices of producing particles, and adopts the technology of vacuum packing, which prevents effectively deliquescence, oxidization of sodium sulfide, prolong the storage time the invention also adopts a system of automatically packing to reduce labor, improve working environment, save packing cost

A process for making an extreme pressure lubricating oil additive

Abstract: of EP0032281An additive for improving extreme pressure properties of lubricating oils may be produced, without the need for a recovery step involving treatment with aqueous caustic, by reacting sulfur monochloride with a monoolefin, for example isobutene, to form an adduct, reacting the resulting adduct with sulfur and sodium sulfide in an aqueous alkanol medium using from 0.1 to 0.4 gram atom of sulfur per gram mole of sodium sulfide, and then recovering the reaction product from this latter reaction. The invention includes both the additive and the process, lubricating oil compositions comprising the additive and lubricating oil additive packages comprising the additives and one or more conventional lubricating oil additives.