Abstract: In the detoxification of waste waters containing nitrite ions by means of hydrogen peroxide the addition of hydrogen peroxide is automatically controllable by adding the hydrogen peroxide continuously or in portions with continuous measurement of the pH and stopping the addition when no further reduction of the pH is caused by it. By control of the hydrogen peroxide addition through the change of the pH it is guaranteed that sufficient hydrogen peroxide is added to reach a complete detoxification of the waste water while on the other hand there is not wasted hydrogen peroxide unnecessarily.

Abstract: 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.

Abstract: There is provided an apparatus for continuous measurement of ion concentration in solutions by means of ion sensitive electrodes, which apparatus consists of an electrode containing measuring cell and a dosaging device. This apparatus is particularly suited for measuring cyanide ion concentration in strong hydrochloride solution in the presence of cyanogen chloride. The dosaging device contains a degassing section and a reflecting plate to which the supply means for the working solution to be measured and for the necessary auxiliary reagents are directed, the supply means being in the form of screens or nozzles.

Abstract: A process for the preparation of fine droplet-reacted sodium aluminosilicates with the smallest particle sizes, containing less than 0.1% by weight of granules exceeding 25 .mu.m in size, said aluminosilicates being insoluble in water and containing some bound water, of the general formulaxNa.sub.2 O.Al.sub.2 O.sub.3.y SiO.sub.2in which x is a number from 0.2 to 1.5 and y is a number from 1.5 to 10, prepared by reacting aqueous sodium aluminate with aqueous sodium silicate in the presence of an excess of aqueous sodium hydroxide and subsequent filtration, comprising the step of separately passing a solution of sodium aluminate with a composition corresponding to the molar ratios:1 Al.sub.2 O.sub.3 :1 to 10 Na.sub.2 O:20 to 200 H.sub.2 Oand a solution of sodium silicate with a composition corresponding to the molar ratios:Na.sub.2 O:SiO.sub.2 from 0.1 to 10 andH.sub.2 O:SiO.sub.

Abstract: An aqueous dispersion of a hydrophobic silica consisting of 0.1 to 50 parts of hydrophobic silica, in a given case up to 3 parts of wetting agent and 99.9 to 50 parts of water. It is produced by intensive mixing of hydrophobic silica with water with the known "dry-water-phase" as an intermediate step. In a given case there can additionally be used a wetting agent in which case the "dry-water-phase" does not occur. The dispersion of hydrophobic silicas can be mixed without additional steps or materials with rubber latex.

Abstract: 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.

Abstract: Finely divided precipitated silicic acid is obtained by the method of the invention.Compositions containing the finely divided precipitated silicic acid as a filler distributed in an elastomer such as an organopolysiloxane are disclosed.

Abstract: A method for the preparation of finely-divided, water-insoluble, aluminosilicate cation-exchangers with a narrow particle size spectra suitable for detergent formulations comprising:(1) agitating a water-dissolved alkali metal silicate at a temperature of from 55.degree. C. to 95.degree. C.(2) mixing therewith at a temperature of from 55.degree. C. to 95.degree. C. over a period of from three seconds to five minutes with vigorous agitation, a water-dissolved alkali metal aluminate, in the presence of an excess of alkali to give a suspension of a silicate compound containing bound water and having a calcium binding power, when measured at 22.degree. C. by the Calcium Binding Power Test Method, of at least 50 mg CaO/gm of anhydrous active substance, and having the formula, bound water not shown,(M.sub.2 O).sub.0.8-1.3.Al.sub.2 O.sub.3.(SiO.sub.2).sub.1.75-2.0wherein M represents an alkali metal, wherein said reactant solutions when mixed have a composition corresponding to the desired Al.sub.2 O.sub.3 and SiO.

Abstract: Monolithic carrier matrixes are formed from high grade steel, consisting of alternating smooth and corrugated layers of sheet metal and/or screen cloth, which may be combined with layers of smooth screen cloth or of smooth or corrugated sheet metal, wherein the layers may be coated on their surfaces with a catalysis-promoting carrier material. These carrier matrixes may be used to produce catalysts for the purification of exhaust gases.

Abstract: Suspension or solutions of cyanuric chloride in water containing organic solvents are prepared at high mixing velocities and low temperatures with resulting low degree of hydrolysis by introducing liquid cyanuric chloride through a nozzle in the upper portion of the mixing apparatus in countercurrent flow to upwardly flowing solvent introduced from at least one lower nozzle above a breast shaped constriction in the lower, open portion of the apparatus. In this way the chamber walls are always covered with an unbroken layer of liquid. The process can be carried out at normal, reduced or elevated pressure. At reduced pressure by evaporation of the solvent there is simultaneously a cooling of the system.

Abstract: 2-Alkoxy-4,6-dichloro-s-triazines are produced by the known reaction of cyanuric chloride with an alcohol 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 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.

Abstract: Suspension or solutions of cyanuric chloride in water are prepared at high mixing velocities and low temperatures with resulting low degree of hydrolysis by introducing liquid cyanuric chloride through a nozzle in the upper portion of the mixing apparatus in countercurrent flow to upwardly flowing water introduced from at least one lower nozzle above a breast shaped constriction in the lower, open portion of the apparatus. In this way the chamber walls are always covered with an unbroken layer of liquid. The process can be carried out at normal, reduced or elevated pressure. At reduced pressure by evaporation of the water there is simultaneously a cooling of the system.

Abstract: Finely divided suspensions of cyanuric chloride in organic solvents which are practically water free are prepared at high mixing velocities and low temperatures by introducing liquid cyanuric chloride through a nozzle in the upper portion of the mixing apparatus in countercurrent flow to upwardly flowing solvent introduced from at least one lower nozzle above a breast shaped constriction in the lower open portion of the apparatus. In this way the chamber walls are always covered with an unbroken layer of liquid. The process can be carried out at normal, reduced or elevated pressure. At reduced pressure by evaporation of the solvent there is simultaneously a cooling of the system.

Abstract: A process for the continuous production of an aqueous, alkaline suspension of x-ray amorphous sodium aluminosilicate having a small particle size of at least 99% by volume of a particle size of less than 50.mu., suitable for conversion into zeolite sodium aluminosilicate of the smallest particle sizes, by mixing an aqueous sodium aluminate solution with an aqueous sodium slicate solution in the presence of excess sodium hydroxide solution at a temperature in the range of from 20.degree. to 103.degree. C., where the solutions being mixed have a mathematical total molar ratio of:1.5 to 9 Na.sub.2 O:1 Al.sub.2 O.sub.3 :1 to 7 SiO.sub.2 :40 to 400 H.sub.

Abstract: 2-mercapto-4,6-dichloro-s-triazines or substituted 2-mercapto-4,6-dichloro-s-triazines are produced by the known reaction of cyanuric chloride with a mercaptan or mercaptide 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 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.

Abstract: In case of the pyrogenous production of metal oxides or metalloid oxides, whenever a halogen compound is used as a starting material, an elementary halogen is formed as a byproduct. This may be converted in the cooling section of the reaction apparatus with hydrogen into hydrogen halide.For a better temperature control and prevention of uncontrolled deflagration of the hydrogen in case of the halogen detonating gas reaction, according to the invention the hydrogen is introduced into the cooling section by means of a double jacket pipe, whereby an inert gas is introduced additionally by way of the interstice between the inside wall and the outside jacket of the double jacket pipe into the cooling section.

Abstract: There are prepared compounds corresponding to the formula ##STR1## in which X is a 5-membered or 6-membered aromatic heterocyclic radical which is attached through a carbon atom to the adjacent CH.sub.2 -group and which contains from 1 to 3 nitrogen atoms or one nitrogen atom and one oxygen or sulphur atom, and which may be substituted once or twice by substituents defined hereinbelow, each R.sup.1 represents hydrogen or a C.sub.1 -C.sub.4 -alkyl group, Alk represents a C.sub.2 -C.sub.6 -alkylene chain and Ac is defined hereinbelow and their salts.

Abstract: A method for reprocessing used lubricating oils is disclosed wherein the oil is dried, treated with finely dispersed sodium metal at elevated temperature, the remaining free or organically bound metal is decomposed by means of an active hydrogen containing compounds, followed by distillation of the oil for recovery.

Abstract: 2-acetamidocinnamic acid and substituted 2-acetamidocinnamic acids are prepared by reacting glycine with an aromtic aldehyde in the presence of acetic anhydride and a tertiary amine and subsequently treating with water.

Abstract: There are prepared compounds of the formula ##STR1## where >A--B-- has either the structure >C(OH)--CH.sub.2 -- or the structure >C.dbd.CH, Alk is a straight or branched chain C.sub.1 -C.sub.5 -alkylene group and Y is a C.sub.3 -C.sub.7 -cycloalkyl group, a benzyl group, a methylenedioxybenzyl group, a benzyl group having one, two or three C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy group substituents, a C.sub.1 -C.sub.6 -alkyl group, or a C.sub.1 -C.sub.6 -alkyl group substituted by an amino group, a di C.sub.1 -C.sub.4 -alkylamino group, a mono C.sub.1 -C.sub.4 -alkyl-amino group, a morpholino group, a piperazino group or a 4-(C.sub.1 -C.sub.4 -alkyl)-piperazino group, or Y is ##STR2## where R is hydrogen or a C.sub.1 -C.sub.4 -alkyl group and T is hydrogen or a C.sub.2 -C.sub.6 -alkanoyl group or where --NHY is ##STR3## where R' is hydrogen, phenyl, phenyl substituted once or twice by C.sub.1 -C.sub.4 -alkyl groups, a C.sub.1 -C.sub.4 -alkoxy group or by halogen atoms, a C.sub.1 -C.sub.