Benckiser-knapsack Gmbh

Hoechst Aktiengesellschaft

Benckiser-knapsack Gmbh Ladenburg

Klaus Sommer

Hermann Weber

Guenter Raab

Karl Merkenich

Wilhelm Spatz

Walter Klemm

Frederich Meinhardt

Gerhard Schonmann

Joachim Kandler

Klaus Hestermann

Horst-Dieter Wasel-Nielen

Werner Gohla

Hans-Adolf Rohlfs

Joachim Wasel-Nielen

Oskar Gehrig, Deceased

Gottfried Schoebel

A process and apparatus for condensing solid materials such as phosphates which tend to sinter and adhere when heated in a reactor wherein the reactants are introduced into a trough-like reactor provided with at least one set of rotatable agitating paddles. Heat is supplied to the reactor by passing a heating medium, such as a molten salt or a molten metal, through one or more heating jackets on the exterior of the reactor housing. The agitating paddles press the solid material in a thin layer against the wall of the reactor housing, and the material in the layer absorbs heat from the heating medium and sinters to a hard layer. One paddle of each set of paddles is provided with a stripping knife which moves along a path closely adjacent to the exterior wall of the reaction chamber to strip sintered material from the wall of the reactor housing. Heat is also transferred to the interior of the reactor housing by circulating the peeled material through the interior region of the reactor housing.

Process for the condensation of phosphate solids

Disclosed are a composition and method for treating aqueous solutions with N-carboxy alkyl amino alkane polyphosphonic acids which have more than two carbon atoms in their carboxy alkyl group, and their alkali metal salts. The acids and salts are prepared in a good yield by reacting alkali metal salts of amino alkane phosphonic acids in which at least one hydrogen atom of the amino group is unsubstituted, in an alkaline medium with an .alpha.,.beta.-unsaturated carboxylic acid at increased temperature. The free acids are preferably recovered from the reaction solution by a treatment with a cation exchange agent. In place of the .alpha.,.beta.-unsaturated carboxylic acids there can also be used their anhydrides, esters, or nitriles. The resulting polyphosphonic acids have a good complexing or sequestering effect on polyvalent metal ions.

Composition and treating aqueous solutions with N-carboxy alkyl amino

Novel N-carboxy alkyl amino alkane polyphosphonic acids which have more than two carbon atoms in their carboxy alkyl group, and their alkali metal salts are prepared in a good yield by reacting alkali metal salts of amino alkane phosphonic acids in which at least one hydrogen atom of the amino group is unsubstituted, in an alkaline medium with an .alpha., .beta.-unsaturated carboxylic acid at increased temperature. The free acids are preferably recovered from the reaction solution by a treatment with a cation exchange agent. In place of the .alpha., .beta.-unsaturated carboxylic acids there can also be used their anhydrides, esters, or nitriles. The resulting polyphosphonic acids have a good complexing or sequestering effect on polyvalent metal ions.

N-Carboxy alkyl amino alkane polyphosphonic acids

Disclosed is a process for preparing a salt hydrate composition having a phase transition heat greater than the heat capacity of water at a corresponding temperature, for charging a latent heat storage device. The process comprises the steps of providing an acid component of the salt hydrate; providing a base component of the salt hydrate, wherein at least one of the acid or base components comprises a liquid; and mixing the acid component and the base component together to cause a neutralization reaction. The acid and base components are mixed in a ratio and in respective concentrations to produce a salt hydrate solution saturated at the desired phase transition point.

Process for charging a latent heat storage device with a salt hydrate

Process and apparatus for the condensation of solids

The invention provides cleaning and detergent compositions which contain about 0.2 to 5 weight % of at least one compound of the general formula (I) ##STR1## in which R stands for a hydrogen atom or a methyl group and R.sub.1 stands for a hydrogen atom or an alkali metal or NH.sub.4 -ion.

Detergent and cleaning compositions

The present invention is concerned with the novel and highly advantageous process of producing N-acylaminomethanephosphonic acid in a one-step process by reacting a acylonitrile with formaldehyde or a formaldehyde-yielding compound and phosphorous acid in the presence or absence of the solvent at an elevated temperature, preferably at a temperature between about 60.degree. C. and the boiling point of the mixture. The reaction may be carried with or without a polar aprotic solvent and/or an acidic catalyst.

Process of producing n-acylaminomethane phosphonic acids

N-(sulfo alkane) amino alkane phosphonic acids or their water-soluble salts are obtained by reacting an alkali metal salt of an amino alkane phosphonic acid with at least one hydrogen atom in the amino group which can be replaced by a sulfo alkane group, in an alkaline medium with an alkane sultone while heating.

N-(Sulfoalkane) amino alkane phosphonic acids and their water-soluble

Novel and highly advantageous N-sulfo alkane amino alkane phosphonic acids and their alkali metal salts are provided. Said phosphonic acids are produced by reacting an alkali metal salt of an amino phosphonic acid with a halo, preferably chloro, or hydroxy alkane sulfonic acid or their alkali metal salts in an alkaline medium, while heating. In place of the halo and especially chloro or hydroxy alkane sulfonic acid reactants, there can also be used compounds which are capable of producing hydroxy alkane sulfonates such as carbylsulfate or aldehydes or, respectively, ethylene oxide with alkali metal bisulfites or metasulfites. The reaction is preferably carried out in a molar proportion of about 1:1 to about 1:2. The novel compounds are excellent complexing or sequestering agents especially with respect to polyvalent metal ions. They are highly resistant against hydrolysis and high temperatures and are of a very high water solubility.

N-Sulfo alkane amino alkane phosphoric acids and their alkali metal

Valuable amino alkane diphosphonic acids in which one or both hydrogen atoms of the amino group are substituted by hydroxy alkane groups, and their alkali metal salts and a process of using them are described. Said compounds are highly water-soluble, are stable against hydrolysis even at temperatures exceeding 100.degree. C., and have a high sequestering power so that they can be used advantageously, for instance, in processing aqueous media of considerable hardness, and in suppressing scale and corrosion in aqueous media used for heat treatment of containers.

Method for sequestering metal ions

Valuable and highly water soluble N-phosphono methylene mono- and di-amino alkane mono- and polyphosphonic acids which have not only an &gt;N--CH.sub.2 --PO.sub.3 H.sub.2 group but also a C--PO.sub.3 H.sub.2 group in their molecule are produced by reacting amino alkane mono- or diphosphonic acids with formaldehyde and phosphorous acid or alkane nitriles with phosphorous acid, formaldehyde, and concentrated hydrochloric acid. The resulting phosphonic acid compounds are valuable sequestering agents forming complex compounds with bi- and polyvalent metal ions. They are useful for water softening even in substoichiometric amounts, in textile treatment baths, in the paper manufacture, in tanning baths, for the manufacture of liquid fertilizers, and for other purposes.

N-Phosphono methylene amino alkane phosphonic acid compounds, process of

Valuable amino alkane diphosphonic acids in which one or both hydrogen atoms of the amino group are substituted by hydroxy alkane groups, and their alkali metal salts and a process of making them are described. Said compounds are highly water-soluble, are stable against hydrolysis even at temperatures exceeding 100.degree. C., and have a high sequestering power so that they can be used advantageously, for instance, in processing aqueous media of considerable hardness, in baths for treating textiles, in the paper manufacture, in tanning, as liquid fertilizers, and for other purposes.

N-hydroxy alkane amino alkane diphosphonic acids, process of producing

An advantageous process of producing Maddrell salt which is substantially free of water-soluble by-products is described. The resulting substantially water-insoluble Maddrell salt is especially useful as polishing and cleaning agent in toothpaste.

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Heidelberg, Germany

Klaus Sommer