Abstract: Disclosed herein are new argyrodite compositions of matter, including, for example, Li6PS5CN, and methods for making the same.

Abstract: A method of preparing a solid electrolyte and an all-solid battery including a solid electrolyte prepared by the method, the method including: contacting a first solvent and a first starting material comprising an alkali metal, sulfur, phosphorus, an element M, or a combination thereof to form a first solution; precipitating a first precursor from the first solution; contacting a second solvent, the first precursor, and a second starting material comprising an alkali metal, sulfur, phosphorus, an element M, or a combination thereof to form a second solution; precipitating a second precursor from the second solution; and heat treating the second precursor to prepare the solid electrolyte, wherein the element M comprises an element of Group 14 of the Periodic Table of the Elements, and the element M and the alkali metal in the first starting material and the second starting material are the same or different.

Abstract: The present invention relates to a new and simple purification process of phosphorus decasulfide (P4S10), also called phosphorus pentasulfide (P2S5), which is used as thionating agent for the syntheses of various organic compounds, particularly the organic compounds having sulfur heteroatom(s).

Abstract: A sulfide solid electrolyte including a sulfide product prepared by mixing at least Li2S and P2S5 in an organic solvent, wherein the organic solvent includes a tetrahydrofuran compound optionally substituted with a C1-C6 hydrocarbon group or a C1-C6 hydrocarbon group including an ether group, or a C2-C7 non-cyclic ether compound.

Abstract: A main object of the present invention is to provide a sulfide solid electrolyte material having favorable ion conductivity and low reduction potential. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material including an M1 element (such as a Li element), an M2 element (such as a Ge element, a Si element and a P element) and a S element, wherein the material has a peak at a position of 2?=29.58°±0.50° in X-ray diffraction measurement using a CuK? line; and when a diffraction intensity at the peak of 2?=29.58°±0.50° is regarded as IA and a diffraction intensity at a peak of 2?=27.33°±0.50° is regarded as IB, a value of IB/IA is less than 0.50, and M2 contains at least P and Si.

Abstract: The main object of the present invention is to provide a sulfide solid electrolyte material having favorable ion conductivity and high stability against moisture. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material comprising an M1 element (such as Li element), an M2 element (such as Ge element, Sn element and P element) and a S element, and having a peak at a position of 2?=29.58°±0.50° in X-ray diffraction measurement using a CuK? ray, characterized in that when a diffraction intensity at the above-mentioned peak of 2?=29.58°±0.50° is regarded as IA and a diffraction intensity at a peak of 2?=27.33°±0.50° is regarded as IB, a value of IB/IA is less than 0.50, and the M2 contains at least P and Sn.

Abstract: Disclosed is a method for preparing a semiconductor nanocrystal, comprising: forming a reaction mixture comprising injecting one or more first semiconductor nanocrystal precursors including one or more Group V elements and one or more Group VI elements into a mixture including one or more second semiconductor nanocrystal precursors including one or more Group II elements and one or more Group III elements at a first temperature; and reacting the first and second semiconductor nanocrystal precursors in the reaction mixture at a second temperature for a period time sufficient to form a semiconductor nanocrystal core comprising at least a portion of the one or more Group II elements, one or more Group III elements, one or more Group V elements, and one or more Group VI elements included in the first and second semiconductor nanocrystal precursors, wherein the second temperature is greater than the first temperature.

Abstract: A solid electrolyte including as constituent components, lithium, phosphorous and sulfur; wherein, in the 31P-NMR, the solid electrolyte has a peak (first peak) in a region of 81.0 ppm or more and 88.0 ppm or less, the solid electrolyte does not have a peak in regions other than the region of 81.0 ppm or more and 88.0 ppm or less, or even if it has a peak in other regions than the region of 81.0 ppm or more and 88.0 ppm or less, the peak intensity thereof relative to the first peak is 0.5 or less, and the solid electrolyte has an ionic conductivity of 5×10?4 S/cm or more.

Abstract: A solid-state lithium ion conductor includes: Li, P, and S; and at least one metal element selected from Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Zn, Cd, and Hg.

Abstract: An object of the present invention is to provide a sulfide solid electrolyte glass producing a tiny amount of hydrogen sulfide. The present invention attains the above-mentioned object by providing a sulfide solid electrolyte glass including Li3PS4, characterized in that Li4P2S7 is not detected by 31P NMR measurement and the content of Li2S as determined by XPS measurement is 3% by mol or less.

Abstract: The invention provides a polypeptide having a sequence of amino acids consisting of IXDFGLAKL (SEQ ID NO: 1), as well as a nucleic acid encoding the polypeptide, vector comprising the nucleic acid, cell comprising the vector, and compositions thereof. The invention also provides a method of inducing a T-cell response in a patient with epithelial cancer, and a method inhibiting epithelial cancer, wherein the methods comprise administering the composition of the invention. The invention further provides a method of stimulating a cell with the inventive polypeptide and a cell so stimulated.

Abstract: The disclosure provides a process for removing phosphorus-containing colloids and their precursors from an iron chloride solution comprising: (a) heating the iron chloride solution comprising impurities selected from the group consisting of phosphorus-containing colloid, phosphorus-containing colloid precursor, and mixtures thereof, at a temperature of about 100° C. to about 300° C., at least autogenous pressure and for a period of time sufficient to transform the impurities into a filterable solid; and (b) separating the solid from the iron chloride solution. In one embodiment, the iron chloride solution is a byproduct of the chloride process for making titanium dioxide.

Abstract: The invention relates to a crystalline ion-conducting material made of LiMPO4 nanoparticles, wherein M is selected from Cr, Mn, Co, Fe and Ni, in addition to mixtures thereof and the nanoparticles have an essentially flat prismatic shape. The invention also relates to a method for producing said type of crystalline ion-conducting material which consists of the following steps: a precursor component is produced in a solution front a lithium compound of a component containing metal ions M and a phosphate compound, the precursor compound is subsequently precipitated from the solution and, optionally, a suspension of the precursor compound is formed, the precursor compound and/or the suspension is dispersed and/or ground, and the precursor compound and/or the suspension is converted under hydrothermal conditions and subsequently, the crystalline material is extracted.

Abstract: A solid electrolyte including a lithium (Li) element, a phosphorus (P) element and a sulfur (S) element, the 31P MAS NMR spectrum thereof having a peak ascribed to a crystal at 90.9±0.4 ppm and 86.5±0.4 ppm; and the ratio (xc) of the crystal in the solid electrolyte being from 60 mol % to 100 mol %.

Abstract: Methods for producing an electrode active material precursor, comprising; a) producing a mixture comprising particles of lithium hydrogen phosphate, having a first average particle size, and a metal hydroxide, having a second average particle size; and b) grinding said mixture in a jet mill for a period of time suitable to produce a generally homogeneous mixture of particles having a third average size smaller than said first average size. The precursor may be used as a starting material for making electrode active materials for use in a battery, comprising lithium, a transition metal, and phosphate or a similar anion.

Abstract: The invention relates to lithium argyrodite of the general formula (I): Li+(12-n-x)Bn+X2?6-xY?x(I), where Bn+ is selected from the group P, As, Ge, Ga, Sb, Si, Sn, Al, In, Ti, V, Nb, and Ta, X2? is selected from the group S, Se, and Te, Y? is selected from the group Cl, Br, I, F, CN, OCN, SCN, N3, and where 0?x?2, and a method for the production thereof, and the use thereof as a lithium-ion electrolyte in primary and secondary electrochemical energy storage.

Abstract: Efficient heterogeneous catalysts were prepared by derivatization and palladation of commercially available chloromethylated polystyrene, and derivatization and palladation of functionalized silica gels with benzylchloride pendant groups. Both polymer based and silica based heterogeneous catalysts exhibited catalytic activity. Catalytic activity was studied using methanolysis of commercially available P?S pesticides. Catalytic activity of catalysts immobilized on silica gel was greater than catalyst immobilized on polymer.

Abstract: A method of producing a biological tissue-reinforcing material, which is applicable to a site required to be reinforced and which enables to improve the working properties for transplantation, comprising the step S1 of coprecipitating ammonium hydrogen phosphate with calcium nitrate in the presence of sulfuric acid.

Abstract: A sulfide-based inorganic solid electrolyte that suppresses the reaction between silicon sulfide and metallic lithium even when the electrolyte is in contact with metallic lithium, a method of forming the electrolyte, and a lithium battery's member and lithium secondary battery both incorporating the electrolyte. The electrolyte comprises Li, P, and S without containing Si. It is desirable that the oxygen content vary gradually from the electrolyte to the lithium-containing material at the boundary zone between the two members when analyzed by using an XPS having an analyzing chamber capable of maintaining a super-high vacuum less than 1.33×10?9 h Pa and that the oxygen-containing layer on the surface of the lithium-containing material be removed nearly completely. The electrolyte can be formed such that at least part of the forming step is performed concurrently with the step for etching the surface of the substrate by irradiating the surface with inert-gas ions.

Abstract: A nonaqueous electrolyte battery includes a positive electrode containing a positive electrode active material, a negative electrode containing a sulfide containing Fe, and a nonaqueous electrolyte including a nonaqueous solvent and a solute dissolved in the nonaqueous solvent, the nonaqueous solvent containing a first solvent containing a cyclic carbonate and a second solvent containing a chain carbonate, wherein the content of the first solvent in the nonaqueous solvent falls within a range of between 4.8 and 29% by volume and the content of the second solvent in the nonaqueous solvent falls within a range of between 71 and 95.2% by volume.

Abstract: A sulfide-based inorganic solid electrolyte that suppresses the reaction between silicon sulfide and metallic lithium even when the electrolyte is in contact with metallic lithium, a method of forming the electrolyte, and a lithium battery's member and lithium secondary battery both incorporating the electrolyte. The electrolyte comprises Li, P, and S without containing Si. It is desirable that the oxygen content vary gradually from the electrolyte to the lithium-containing material at the boundary zone between the two members when analyzed by using an XPS having an analyzing chamber capable of maintaining a super-high vacuum less than 1.33×10−9 h Pa and that the oxygen-containing layer on the surface of the lithium-containing material be removed nearly completely. The electrolyte can be formed such that at least part of the forming step is performed concurrently with the step for etching the surface of the substrate by irradiating the surface with inert-gas ions.

Abstract: Novel compounds are provided in the form of nucleoside pyrophosphate and triphosphate analogs. In these analogs, the pyrophosphate or triphosphate group is replaced with a moiety that is isosterically and electronically identical thereto, but is hydrolytically and enzymatically more stable. The compounds are useful as therapeutic agents, e.g., as antiviral agents, anticancer agents, metabolic moderators and the like. The invention also provides pharmaceutical compositions containing a compound of the invention as an active agent, and in addition provides methods of treating disease, including viral infections, cancer, bacterial infections, inflammatory and/or autoimmune diseases, and the like, by administering a compound of the invention to a patient in need of such treatment.

Abstract: A method of delivering disinfectant in an absorbent substrate. A first step involves intermixing a first reactant chemical with a first ink. A second step involves intermixing a second reactant chemical with a second ink. A third step involves printing a first pattern on an absorbent substrate with the first ink. A fourth step involves printing a second pattern on the absorbent substrate with the second ink. The second pattern is positioned in close proximity to the first pattern, such that when the first pattern and second pattern are exposed to water an intermixing of the first reactant chemical and the second reactant chemical occurs to produce an aerosol disinfectant.

Abstract: The present invention relates to an improved process for the preparation of thiophosphoryl chloride which is useful as an intermediate for the synthesis of insecticidally active compounds. The improvement comprises the presence in the reaction mixture of a catalytic amount of a nitroxide free radical of the following general formula: wherein R1, R2, R3 and R4 represent an alkyl group.

Abstract: An nickel hydroxide positive electrode active material which can be made by an ultrasonic precipitation method. The nickel hydroxide active material is characterized by the composition: ##EQU1## where x, the number of water ligands surrounding each Ni cation, is between 0.05 and 0.4 and y is the charge on the anions.

Abstract: The present invention is directed to a catalyst composition comprising a non-zeolitic molecular sieve and one or more alkaline earth metals selected from the group consisting of strontium, calcium, barium, and mixtures thereof, wherein said non-zeolitic molecular sieve has a pore diameter size of less than about 5 Angstroms.

Abstract: This invention relates generally to inorganic ionic liquids which function as electrolytes and do not crystallize at ambient temperature. More specifically, this invention is directed to quasi-salt inorganic ionic liquids which comprise the reaction product of a strong Lewis acid with an inorganic halide-donating molecule. This invention is further directed to quasi-salt inorganic ionic liquid mixtures which comprise combinations of electrolyte additives and quasi-salt inorganic ionic liquids. These quasi-salt inorganic ionic liquid mixtures are useful electrolytes.

Abstract: This invention relates generally to electrolyte solvents for use in liquid or rubbery polymer electrolyte solutions as are used, for example, in electrochemical devices. More specifically, this invention relates to sulfonyl/phospho-compound electrolyte solvents and sulfonyl/phospho-compound electrolyte solutions incorporating such solvents.

Abstract: There is disclosed a novel process for preparing products of the reaction of elemental phosphorus and elemental sulfur under reaction conditions wherein the phosphorus and sulfur are combined in a pre-mix at temperatures below the reaction temperature. The pre-mix may contain a diluent which is preferably the product of the reaction. Phosphorus pentasulfide can be prepared by heating the pre-mix to reaction temperatures wherein lower exotherm temperatures and reduced vibration are observed. Organophosphorus and thionated products can be prepared by the reaction of elemental sulfur and elemental phosphorus together with an organic compound wherein the ratio of phosphorus and sulfur generally corresponding to P.sub.2 S.sub.5. The process obviates the need for separately preparing phosphorus pentasulfide to prepare thiohated and organophosphorus compounds.

Abstract: A method for treatment of process waste obtained from the synthesis of thiophene or its derivatives, which method produces phosphorus pentasulfide of sufficiently high purity for recycling in said synthesis process, as well as a residue material suited for use as a raw material for fertilizers. In the treatment method, the process waste is subjected to vacuum evaporation in a combination heating/evaporation reactor at 500.degree.-700.degree. C. and under a partial vacuum of 0.01-0.2 atm. To improve the yield of the evaporating phosphorus pentasulfide, sulfur is added to the process waste. The evaporating phosphorus pentasulfide is condensed, and when desired, pulverized. The usable, phosphorus- and potassium-containing evaporation residue is removed from the reactor and cooled for further use.

Abstract: Uniform, free-flowing, non-friable P.sub.2 S.sub.5 granules having a predetermined reactivity can be produced by accretion by spraying molten P.sub.2 S.sub.5 Sonto cascading, smaller solid particles of P.sub.2 S.sub.5. The process can be used to produce any reactivity grade of P.sub.2 S.sub.5 by adjusting processing conditions. The process can also be used to produce P.sub.2 S.sub.5 in a form suitable for bulk shipping.

Abstract: Uniform, free-flowing, non-friable P.sub.2 S.sub.5 granules having a predetermined reactivity can be produced by accretion by spraying molten P.sub.2 S.sub.5 onto cascading, smaller solid particles of P.sub.2 S.sub.5. The process can be used to produce any reactivity grade of P.sub.2 S.sub.5 by adjusting processing conditions. The process can also be used to produce P.sub.2 S.sub.5 in a form suitable for bulk shipping.

Abstract: There is disclosed a novel process for preparing products of the reaction of elemental phosphorus and elemental sulfur under reaction conditions wherein the phosphorus and sulfur are combined in a pre-mix at temperatures below the reaction temperature. The pre-mix may contain a diluent which is preferably the product of the reaction. Phosphorus pentasulfide can be prepared by heating the pre-mix to reaction temperatures wherein lower exotherm temperatures and reduced vibration are observed.

Abstract: .sup.32 P-Thiophosphates of the general formula: ##STR1## wherein n =1, 2 or 3 and each M, which may be the same or different, is H or a cation, are prepared by heating H.sub.3.sup.32 PO.sub.4 or a salt thereof with at least an equivalent amount of a thiophosphoryl halide and then treating the reaction product with an aqueous medium to hydrolyse the reaction product and form the .sup.32 P thiophosphate.

Abstract: The tetraphosphorus polysulfides of the formula P.sub.4 S.sub.x, wherein x is at least 3, especially tetraphosphorus decasulfide, P.sub.4 S.sub.10, are prepared by (a) establishing a continuously circulating closed loop of a liquid reaction mixture which comprises desired final product tetraphosphorus polysulfide, (b) continuously introducing liquid phosphorus and liquid sulfur into such continuously circulating reaction mixture and therein continuously reacting the liquid phosphorus with the liquid sulfur, and (c) continuously separating desired final product tetraphosphorus polysulfide, in gaseous state, from such continuously circulating reaction mixture.

Abstract: Phosphorus pentasulfide is made. To this end gaseous nitrogen is introduced into the pipes feeding a reactor with a phosphorus melt and sulfur melt and/or into the outlet pipe for the phosphorus pentasulfide melt, the nitrogen being admitted under a pressure lower than the static pressure exerted in the pipes by the quantity of melt upstream of the gas inlets.

Abstract: A low-temperature synthesis of M.sup.II PS.sub.3 (M preferably Fe, Co or Ni) comprises mixing M.sup.2+ cation with P.sub.2 S.sub.6.sup.4- anion; if insoluble, M.sup.II PS.sub.3 precipitates; otherwise, M.sup.2+ cation can be supplied off an M.sup.2+ -cation-exchange resin through which Na.sub.4 P.sub.2 S.sub.6 solution is trickled. The product is X-ray amorphous, and is brought to a desirable degree of partial order by heating at 350.degree. C. for 3 hours. In this form it can reversibly intercalate lithium and, mixed with binder and graphite, is a cathode for a lithium rechargeable cell.

Abstract: In order to obtain substances that are optically transparent in the infrared range, usable in the manufacture of optical fibers or radiation emitters, a metal or metalloid chalcogenide other than an oxide is produced by a double-substitution reaction between a starting chalcogen compound--particularly a hydride such as H.sub.2 S, H.sub.2 Se or H.sub.2 Te--and a salt of the desired metal or metalloid, e.g. a chloride. The starting compound and the reactant salt preferably are vaporized at a temperature below the melting point of the resulting metal chalcogenide which thereupon precipitates in the reaction chamber.

Abstract: A dry differential flotation reagent for molybdenum-bearing ore is disclosed comprising from about 1 to about 30 percent by weight of NaSH, 0 to 20 percent by weight of NaOH, 60 to 90 percent by weight of a mixture of sodium thiophosphates comprising, as major components thereof, Na.sub.3 PS.sub.4, Na.sub.3 PS.sub.3 O, Na.sub.3 PS.sub.2 O.sub.2, and Na.sub.3 PO.sub.3 S, with Na.sub.3 PS.sub.4 further comprising from about 15 mole percent to about 70 mole percent of the phosphate mixture. The flotation reagent can be prepared by reacting P.sub.4 S.sub.10 with NaOH and NaSH in a molar ratio of about 1:16. When added to a flotation vessel containing molybdenum concentrate, the flotation reagent promotes suppression of lead and copper sulfides, even without the addition of sodium cyanide, to permit the improved recovery of molybdenum with a lower level of impurities.

Abstract: The process for the production of light olefins from a feedstock comprising methanol, ethanol, dimethyl ether, diethyl ether or mixtures thereof comprising contacting said feedstock with a silicoaluminophosphate molecular sieve at effective process conditions to produce light olefins.

Abstract: The invention provides a process and an apparatus for removing molten phosphorus pentasulfide, via an overflow, from a reactor, wherein phosphorus is reacted with sulfur at temperatures higher than 300.degree. C.To this end, the reactor is supplied with phosphorus and sulfur from dosing vessels which are given the dimensions necessary (a) to receive the quantity of phosphorus and sulfur, respectively, which are required to produce phosphorus pentasulfide with a preselected quantitative ratio of P:S, (b) to provide a total filling volume corresponding to that of a P.sub.2 S.sub.5 -receiving tank. The quantity of the phosphorus and sulfur feed materials in the respective dosing vessels is in each case fully emptied into the reactor and a corresponding quantity of molten P.sub.2 S.sub.5 is simultaneously discharged directly from the reactor, via the overflow, into the respective P.sub.2 S.sub.5 -receiving tank, whose filling volume exactly corresponds, to that of the dosing vessels.

Abstract: Photoelectrochemical cells employing chalcogenophosphate (MPX.sub.3) photoelectrodes are disclosed, where M is selected from the group of transition metal series of elements beginning with scandium (atomic number 21) through germanium (atomic number 32) yttrium (atomic number 39) through antimony (atomic number 51) and lanthanum (atomic number 57) through polonium (atomic number 84); P is phosphorus; and X is selected from the chalogenide series consisting of sulfur, selenium, and tellurium. These compounds have bandgaps in the desirable range of 2.0 eV to 2.2 eV for the photoelectrolysis of water and are stable when used as photoelectrodes for the same.

Abstract: Phosphorus pentasulfide of low reactivity is made by solidifying molten phosphorus pentasulfide on a cooling cylinder that delivers the solidified product at a temperature of 150.degree. to 220.degree. C., and that product is immediately introduced into a heat-insulated container and freed therein from its immanent or sensible heat by cooling at a rate of at most 30.degree. C. per hour without the expenditure of any energy to control the cooling.

Abstract: The invention relates to an apparatus for making P.sub.2 S.sub.5 comprised of a plurality of reactors connected by pipe structures to a collecting tank which is common to all of them. By means of partitions, the cooling tank is subdivided into a plurality of separate chambers. Outlet pipes open thereinto and terminate in collecting devices. The pipe structures running to the collecting tank are pivotably arranged above the various chambers and permit liquid P.sub.2 S.sub.5 to be introduced thereinto at will.

Abstract: The present invention provides a process for the production of solid ion ductor materials (electrolytes) based on lithium or sodium compounds which stand in thermodynamic equilibrium with their alkali metal and have a high decomposition voltage, wherein two or more binary lithium or sodium compounds with an anion which is formed from one or more elements of the group consisting of nitrogen, phosphorus, arsenic, oxygen, sulphur, selenium, tellurium, hydrogen, fluorine, chlorine, bromine and iodine and which stand in thermodynamic equilibrium with their alkali metal are reacted together in such amounts and for such a period of time that a radiographically phase-pure product is formed.The present invention also provides ion conductor materials based on lithium or sodium compounds, which have the general formula:A.sub.3u+2v+w X.sub.u Y.sub.v Z.sub.

Abstract: Process for the purification of phosphorus pentasulphide by means of distillation under vacuum at a residual pressure of about 6 mmHg and carried out according to a "thermal profile" comprising, immediately before and immediately after the liquid-vapor-liquid double passage of state, two stationary stages wherein said pentasulphide is maintained in the liquid state at a temperature very close to the boiling temperature of the pentasulphide itself.

Abstract: The process disclosed in this invention takes the waste solids, gases, and water from a phosphorus pentasulfide manufacturing facility and hydrolyzes the phosphorus pentasulfide by heating. The phosphorus portion is converted to a soluble phosphate and the sulfur portion to a mixture of sulfide, sulfite and sulfate. The soluble fraction is then treated with a calcium hydroxide solution precipitating the phosphate and sulfates which are removed. The gaseous portion of the hydrolysis is fed to a catalytic oxidizer which converts the sulfides to sulfur, which is removed and the gas, free of sulfur containing species, is exhausted to the atmosphere. The filtrate from the precipitation reaction can be recycled to the plant, or may be chlorinated and discharged.

Abstract: A process for producing relatively pure metal phosphorus trisulfides of the formula MPS.sub.3 wherein M is a metal selected from the group consisting of Mg, Ca, Sr, V, Mn, Fe, Co, Ni, Pd, Zn, Cd, Hg, Sn, Pb, Sm, Eu, Yb and mixtures thereof, said process comprising contacting in a reaction zone, phosphides of said metals of the formula M.sub.x P.sub.y, wherein the ratio of y/x ranges between 1/8 to 5/1, with one or more compounds of the formula PS.sub.z wherein z ranges from 1-3 and is preferably 2, said PS.sub.z being present in the reaction zone in an amount sufficient to exceed the amount of P and S stoichiometrically required to form the desired MPS.sub.3, at a temperature ranging from about 300.degree.-600.degree. C. and confined so as to maintain the PS.sub.z present in the reaction zone as a gas in equilibrium with its liquid for a time sufficient to produce said relatively pure metal phosphorus trisulfide.

Abstract: The invention provides a process wherein a mixture prepared from starting materials comprised of P.sub.2 S.sub.5 of high reactivity and low reactivity, respectively, is converted to phosphorus pentasulfide of predetermined reactivity lying between that of the high reactivity P.sub.2 S.sub.5 and that of the low reactivity P.sub.2 S.sub.5 starting materials. To this end, the starting materials are mixed in quantitative proportions which are selected in accordance with the respective reactivity of the starting materials and the resulting mixture is ground.

Abstract: The reactivity of phosphorus pentasulfide produced by reacting phosphorus and sulfur at a temperature higher than the melting point of phosphorus pentasulfide and allowing the resulting melt to cool and solidify on a cooling device is improved. To this end, liquid phosphorus pentasulfide is placed on, or introduced into, a cooling device; an upper liquid P.sub.2 S.sub.5 -layer portion A is separated immediately from a solidified lower P.sub.2 S.sub.5 -layer portion B which is in direct contact with the cooling surface area of the cooling device; the upper P.sub.2 S.sub.5 -layer portion A is recycled to a P.sub.2 S.sub.5 melt; the lower P.sub.2 S.sub.5 -layer portion B is removed from the cooling device and collected as final product; the reactivity of the collected P.sub.2 S.sub.5 -layer portion B is increased to the same extent as the quantitative ratio of the P.sub.2 S.sub.5 -layer portion A to the P.sub.2 S.sub.5 -layer portion B is increased.