potassium sulfide compound is a crystal form singonicheskoy without color.Its melting point equal to 948 ° C, when the specific substance density 1.805 g / cm3 (density is set at a standard temperature 14 ° C).The crystals are readily soluble in aqueous and highly hygroscopic.In addition, potassium sulfide is hydrolyzed, soluble in glycerol and ethanol.When interacting with them in the course of the reactions produced dihydrate and pentahydrate, is a colorless crystals, characterized by the size of H0obr respectively -984.5 -1,880.0 and kJ / mol.
product is very easy to oxidation in the open air, forming K2S2O3, and released during the combustion SO2.Potassium sulfide was prepared whose formula K2S, K2CO3 reacting with sulfur, thus it is necessary to provide reaction for excluding inflow of air.One can obtain a substance and by the reduction reaction by acting on carbon K2SO4 salt.
potassium sulfide is widely used as an essential component in light-sensitive emulsions and coatings in the industrial and photos.In chemical manufacturing its application based on the ability to act reagent in the implementation of various metal sulphide separation.The use in the textile industry and tanning industry is to include potassium sulfide in the funds for the primary processing of leather.
in the form of hydrogen sulfide or polysulfide KHS agent is used in technologies sulphidation ferro alloys, iron and steel.It is very widely used in the manufacture of drugs for the treatment of various skin diseases.Agricultural use of potassium sulfide - used as a pesticide.
Generally, potassium sulfide get a fairly simple way.To do this, mixed with burnt lime sulfur and potash.This mixture was then dissolved in water and boiled for several hours.As a result of this procedure is formed potassium polysulfide.Then, from the resulting solution through a filter cake of calcium carbonate was removed, and the solution was evaporated before achievement of specific gravity 1.25-1.30.Finally, the solution was further admixed with a small amount of sulfur, heated again, and after cooling is poured.
Education potassium sulfide is quantitative, but for such a course of the reaction is necessary to provide a very slow evaporation of NH3 vapor through a tube, which must be pre-filled with potassium hydroxide.As a result, the correct response must be carried out to give a colorless solution of ammonia and a white precipitate, which is potassium sulfide.
This material must be long enough time to pump a special oil pump, and then be calcined at a temperature of 400-500 ° C.Usually, after that the obtained crystals were pulverized and purified nitrogen in vials under vacuum.
produced by hydrolysis of potassium disulfide is a yellow powder, formula - K2S2.The molecular weight of the substance is 142.327 amuAt a temperature of 477 ° C disulphide begins to melt and at 600 ° C it decomposes.
Potassium sulfide reacts with various substances.For example, by reaction with primary alkyl halides are obtained by symmetrical dialkyl.Also mixed solution of potassium sulphide with different solutions (primarily - hromokalievyh and potash) alum.
For medical purposes is used potassium sulfide, a high degree of purification.In this industry it is presented by different coals, which are prepared from a mixture of the substance itself, its hydroxide and sulfur.Activating medical coal occurs in special furnaces at temperatures below 800 - 900 ° C.Then the removal of sulfur compounds and money from the chlorine ion hydrochloric acid.
