Degussa Aktiengesellschaft

Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Friedrich Bittner

Klaus Hentschel

Ludwig Lange

Walter Hinrichs

Erich Splett

Gerd Schreyer

Lutz Hippe

Peter K Kleinschmit

Jurgen Martens

Herbert Tanner

Friedhelm Geiger

Manfred Spindler

Peter Panster

Werner Schwarze

Birgit Bertsch-Frank

Carl Voigt

Werner Heimberger

Kurt Puschner

Heinz Haschke

Herbert Hovestadt

Helmut Suchsland

Reinhold Reck

Norbert Kriebitzsch

Petra Look-Herber

Christian Hecht

Herbert Hovestadt, Deceased

Axel Duker

Gerd Sohreyer

Gert Rossler

Martin Petzold

Kurt Henkel

Georg Franz

Karl Voigt

Previously known peroxymonosulfate solutions exhibit an unsatisfactory storage stability and/or can only be used with technical limitations. According to the invention, storage-stable, aqueous sodium peroxymonosulfate solutions can be prepared with a content of 5% to 50% by weight NaHSO.sub.5 in an economic manner by means of the partial neutralization of a solution containing sulfuric acid and Caro's acid if a such a solution containing H.sub.2 SO.sub.4 and H.sub.2 SO.sub.5 is added which contains less than 3 parts by weight hydrogen peroxide per 100 parts by weight Caro's acid and the partial neutralization is carried out up to an equivalent proportion of total SO.sub.3 to sodium ions in a range of 1 to 1 up to 1 to 1.3 and if the solution is diluted or concentrated as required.

Method of preparing storage-stable aqueous sodium peroxymonsulfate

Methods for the preparation of lower sodium polysulfides such as sodium disulfide from higher sodium polysulfides and sodium. To this end, either molten sodium polysulfide placed in a receiver is reacted with sodium in a stoichiometric ratio corresponding to the desired product under vigorous agitation and under protective gas or the higher polysulfide and the sodium are dosed into a polysulfide melt in a receiver under the same conditions either alternatively or simultaneously. In all instances, the dosing of the sodium is set so that the reaction mixture remains capable of being agitated and the agitation is continued until the desired product composition has been achieved.

Method of preparing lower sodium polysulfides from higher sodium

A method of preparing sodium monosulfide by means of reacting a sodium polysulfide with sodium under protective gas, the sodium polysulfide is placed in a first stage in a finely distributed, solid state in a receiver, preheated to temperatures of 100.degree.-150.degree. C., liquid sodium is gradually added in the required amount to the material in the receiver under intensive mixing, whereby the temperature of the reaction mixture is maintained at 120.degree.-250.degree. C. and in a second stage the formed initial product is allowed to continue to react, or postreact under continuation of the mixing at 250.degree.-480.degree. C., until a Na.sub.2 S content of at least 95% by weight has been attained.

Method of preparing Na.sub.2 S (II)

A method for the production of catalytically active coatings on shaped articles of aluminum oxide for the production of hydrogen cyanide according to the BMA method. A suspension is used for the coating which suspension contains at least one platinum metal and aluminum in finely divided elementary form in a carrier liquid. According to especially preferred embodiments, the suspension additionally contains glass frits or organic silicon compounds. After the moistening of the shaped article and evaporation of the carrier liquid, the catalyst is formed during heating to 1000.degree. to 1350.degree. C. in the presence of nitrogen and/or ammonia. Essential advantages of the method over the previously known method of coating with solutions of Pt and Al compounds are: the application of different coating thicknesses are possible in a single coating stage, the previously-necessary hydrogenation stage after each impregnation is eliminated and the health risk is reduced.

Method for the production of catalytically active coatings for the

In a method of preparing sodium monosulfide by means of reacting sodium and sulfur under protective gas, the entire sodium determined for reaction is placed in a receiver in a first stage, preheated to temperatures of 100.degree.-150.degree. C., sulfur is gradually added in the required amount of the material in the receiver under intensive mixing, whereby the temperature of the reaction mixture is maintained at 120.degree.-250.degree. C., and in a second stage the formed initial product is allowed to react under continuation of the mixing at 250.degree.-480.degree. C., until a Na.sub.2 S content of at least 95% by weight has been attained.

Method of preparing NA2S (I)

A method of preparing sodium monosulfide by means of reacting sodium and sulfur under protective gas, wherein sodium monosulfide is placed in a first stage in a receiver in a finely distributed, solid state, the initial material is preheated to 120.degree.-150.degree. C. and sulfur and sodium are alternately added in the required amount ratio under intensive mixing, whereby the temperature of the reation mixture is maintained at 120.degree.-250.degree. C., and in a second stage the formed initial product is allowed to continue to react or postreact under continuation of the mixing at 250.degree.-480.degree. C., until a Na.sub.2 S content of at least 95% by weight has been attained.

Method of preparing Na.sub.2 S (III)

There is described a process for the production of pure sodium polysulfides directly from the elements sodium and sulfur. For this purpose, the sodium and the sulfur under a protective gas and in a stoichiometrical ratio corresponding to the desired polysulfide are alternatingly dosed into a previously present melt of a polysulfide with vigorous stirring, the dosing being in portions such that upon introduction of the sodium the reaction mixture remains in the condition of a stirrable suspension and upon introduction of the sulfur this is completely reacted to a polysulfide of the desired or higher sulfur content.

Process for the production of sodium polysulfides from the elements

The method for the preparation of hydrogen sulfide from its respective elements wherein sulfur and hydrogen are reacted in a diffusion flame in a temperature range of 650.degree. to 1300.degree. C.

Method for the preparation of hydrogen sulfide

Aqueous sodium methioninate solutions having a low content of sodium carbonate can be recovered from the crude hydrolysis mixture resulting from the saponification of 5-(.beta.-methylmercaptoethyl)hydantoin with 1.1 to 6 equivalents of sodium hydroxide and/or sodium carbonate by cooling the crude hydrolysis mixture to a temperature below 10.degree. C., separating off the precipitated sodium carbonate and concentrating the sodium methioninate solution remaining to 40 to 65 weight percent.

Process for the production of aqueous sodium methioninate solutions

Aqueous sodium methioninate solutions having a low content of sodium carbonate can be recovered from the crude hydrolysis mixture resulting from the saponification of 5-(.beta.-methylmercaptoethyl)-hydantoin with 1.1 to 6 equivalents of sodium hydroxide and/or sodium carbonate by distilling off the water from the crude hydrolysis mixture until the sodium methioninate content is 40 to 65 weight percent, and after cooling to at most room temperature separating off the precipitated sodium carbonate.

There is provided an apparatus for bringing into contact liquids at least one of which is viscous, the apparatus consisting essentially of a tubular container, a first nozzle from introducing a liquid in the upper portion of the container, at least one other nozzle lower than the first nozzle for introducing a different liquid, the tubular container being closeable at the tap thereof and downward from said other nozzle being constricted breast shaped to form a discharge opening, said other nozzles are preferably of polished steel, said other nozzles consist essentially of at least one tangential spray means arranged in at least one row, said other nozzles being slightly above said constriction and being directed in the direction of the upper closeable device or said first nozzle and wherein the discharge opening can discharge into another container which is permanently or detachably connected to the tubular container, said further container can be provided with means for establishing reduced pressure or superatmospheric pressure.

Apparatus for bringing liquids in contact

To obtain a cyanogen chloride which is practically free from water and preferably also free from hydrogen cyanide, hydrogen chloride and organic compounds, the crude cyanogen chloride is fractionally distilled. The return is led in countercurrent flow to the crude gas, thereby takes up the impurities and is further evaporated in the lower portion of the column, respectively in a special apparatus, by a liquid whose temperature is higher than the boiling temperature of cyanogen chloride. Thereby this liquid also takes up the impurities. The purification action is aided by a wash for the crude cyanogen chloride connected in series before it enters the fractionating column. It is very advantageous to combine the process with a plant for the production of cyanogen chloride.

Process for the recovery of pure cyanogen chloride

By introducing the reaction gas mixture of hydrocarbons and ammonia at increased velocity through an inlet tube with one or more openings in a customary reaction tube in the hydrocyanic acid-methane-ammonia (BMA) process the yield of HCN is increased considerably.

Process for the production of hydrogen cyanide

Three substituents are introduced into cyanuric acid in the presence of an acid binding agent by working in a manner permitting high mixing and therefore high reaction velocities and permitting high throughputs in small tubular containers by introducing liquid cyanuric chloride through a nozzle in the upper portion of the mixing apparatus in countercurrent flow to upwardly flowing reactants (and acid binding agent) introduced from at least one lower nozzle above a breast shaped constriction in the lower, open portion of the apparatus. The process can be carried out at normal, reduced or elevated pressure.

Process for introducing three substituents in cyanuric chloride

Chloro-amino-s-triazines are produced by the known reaction of cyanuric chloride with an amine or .alpha.-aminonitrile in the presence of an acid binding agent in an improved manner by working at high mixing velocities and thus at high reaction speed and thereby obtaining high throughputs in small tubular containers by introducing liquid cyanuric chloride through a nozzle in the upper portion of the mixing apparatus in countercurrent flow to upwardly flowing reactants (plus acid binding agent) introduced from at least one lower nozzle about a breast shaped constriction in the lower, open portion of the apparatus. The process can be carried out at normal, reduced or elevated pressure.

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Bad Soden, Germany

Friedrich Bittner