Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Degussa Aktiengesellschaft

Deutsch Gold-und Silber-scheideanstalt

Gerhard Pohl

Helmut Knorre

Peter Werle

Joachim Fischer

Wolfgang Merk

Rudolf Fahnenstich

Manfred Langer

Herbert Tanner

Klaus Stutzel

Friedhelm Hoevels

Gerhard Morlock

Theodor Lussling

Hans B Wagner

Wolfgang Fischer

Heinz Haschke

Helmut Junkermann

Heidrun Bertram

Gerd Eikelmann

Sven-Peter Mannsfeld

There are described new bisguanamines of the formula ##STR1## where n is a number from 10 to 20 and their production. The bisguanamines are stabilizers for formaldehyde solutions and have outstanding qualifications and action for this purpose.

Bisguanamine

Bisguanamines

The known process for the production of cationic starch ethers by the reaction of starch with cationic etherifying agents in the presence of water in an alkaline medium is improved by reacting the starch at a temperature of about 50.degree. to 120.degree. C. with an alkylidene epoxide which has a tertiary amino group or quaternary ammonium group in a medium which contains about 10 to 35 weight percent water and about 0.2 to 2.0 weight percent calcium hydroxide or calcium oxide. There are produced in short reaction times yields not previously attainable.

Process for the production of cationic starch ethers

Crude pentaerythritol is freed from bis-pentaerythritol monoformal impurity by heating it as a dry material to a temperature of 160.degree. to 200.degree. C.

Process for the purification of pentaerythritol

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.

Procedure for the reprocessing of used lubricating oils

Copper (Cu.sup.++)-ions are separated from an effluent containing complexing agents which are ethylenediamine tetraacetic acid and/or diethylenetriamine pentaacetic acid or their anionic salts, by using an HS-containing triazine compound and Fe.sup.+++ -ions in a quantity at least equal to the amount of complexing agent.

Process for the separation of Cu.sup.++ -ions from sewage, waste water

Cadmium (Cd.sup.++) ions are separated from an effluent containing complexing agent such as nitrilotriacetic acid, ethylenediamine tetraacetic acid and/or diethylenetriamine pentaacetic acid, or their anionic salts by using an HS-containing triazine compound and Fe.sup.+++ ions in a quantity at least equal to the amount of complexing agent.

Process for the separation of cadmium (Cd.sup.++)-ions from sewage,

Caking of industrial alkali metal chlorides and mixtures containing them in storage is prevented and a flowable product is obtained by adding a hydrophilic and/or a hydrophobic material, in combination with a complex iron cyanide, on a hydroxyl group containing carrier to produce a permanent moisture content of at least 0.01 weight percent of water on the salt.

Process for preventing caking and obtaining flowability of alkali

Preventing caking and obtaining flowability of alkali chlorides and salt

Fodder, mixed fodder and silage are preserved with acrylic acid, methacrylic acid or esters or salts of such acids.

Preservative for fodder, mixed fodder and silage

Waste water containing cyanides, cyanohydrins and/or organic nitriles are detoxified by adding a peroxide compound in the presence of iodide ion or free iodine, in a given case in the presence of silver ions.

Process for detoxification of cyanides and nitriles with peroxygen

A process for precipitating heavy metal ion-polycarboxylate complexes from solution, said process comprising adding to a solution containing at least one of said complexes an aqueous solution of a water soluble aluminum salt, the anion of which does not form any water soluble complexes with said heavy metal ions to be precipitated or optionally such anion-heavy metal complexes having a stability constant, expressed as their decadic logarithm, of less than 2; wherein 0.9 to 1.8 moles of aluminum ions are employed per equivalent of polycarboxylate; and adjusting the pH of the resulting reaction mixture to about 6.5 to about 9.0 with an alkali metal carbonate.

Process for the precipitation of heavy metal ion-polycarboxylate

Methionine is stabilized by adjusting the pH to the range from 3 to &lt;5. The source of the hydantoin is preferably 5-(beta-methylmercaptoethyl)-hydantoin.

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Hanau, Germany

Gerhard Pohl