Giulini Chemie Gmbh

Bk Giulini Chemie Gmbh

Bk Giulini Chinie Gmbh & Co., Ohg

Istvan Potencsik

Reinhold Sedelies

Johannes Breker

Ernst Urmann

Werner Kopp

Alexander Maurer

Rudolf Lunkenheimer

Zvi Pelah

Otto Helmboldt

Detlev Roggenkamp

Horst Altmann

Zvi Pehlah

A solidification and curing accelerator for hydraulic binders produced by a process including providing a reaction mixture composed of constituents (a) - (e) as follows: (a) at least one of basic aluminum salts which are substantially water insoluble and aluminum hydroxide; (b) at least one of aluminum sulfate which is substantially water soluble and sulfuric acid; (c) at least one of an organic carboxylic acid or mixtures of at least two organic carboxylic acids; (d) aluminum salts of organic carboxylic acids; and (e) at least one organic and inorganic substance selected from the group consisting of sulfates, hydrogen-sulfates, carbonates, hydrogen-carbonates, alkaline earth metal oxides, and alkaline earth metal hydroxides; adding water to the reaction mixture and reacting at a temperature ranging up to 150 &deg; C. for a time effective to provide a reaction product which is a solution in water.

Solidifying and hardening accelerator for hydraulic binders

A process for purification by multistage countercurrent extraction of wet-process phosphoric acid includes the steps of (a) preparing an aqueous phosphoric acid by decomposition of crude phosphates with sulfuric acid and prepurification thereof; (b) providing an organic solvent mixture consisting of one of (A) a water immiscible solvent and a fully water-miscible solvent or (B) a partially water-miscible solvent and a fully water-miscible solvent; (c) extracting water from the acid by contacting with the solvent mixture in a volumetric ratio of acid to solvent mixture of 1:1 to 1:10 at a temperature of 5 to 90&deg; C.; (d) recovering the fully water-miscible solvent by distillation and washing; (e) recycling the fully water-miscible solvent to step (b) to provide a recycled solvent mixture; and (f) repeating steps (c), (d) and (e) with the recycled solvent mixture to provide a phosphoric acid having a preselected degree of purity.

Wet-process technique for refining phosphoric acid

Use of basic aluminium sulphates as low-alkali set accelerators for

The present invention relates to a novel process for the production of low viscosity copolymers of maleic acid monoalkyl ester and vinyl alkyl ethers characterized in that the copolymerization of alkyl vinyl ether is performed with a mixture composed of maleic acid anhydride and maleic acid monoalkyl ester. The specific viscosity is controlled by the setting of a certain maleic acid anhydride to maleic acid monoalkyl ester ratio.

Process for the production of low viscosity copolymers from maleic acid

A process of manufacturing powdered copolymers of maleic anhydride with methyl vinyl ether in a mole ratio of 1:1 and a specific viscosity in a range from 2 to 5 by copolymerization of maleic anhydride with methyl vinyl ether in the presence of radical initiators to initiate polymerization. The process includes mixing maleic anhydride with an excess of about 3 to about 20 mol methyl vinyl ether per mol maleic anhydride and initiating a polymerization reaction with a radical initiator added in a quantity of from about 0.001 to about 1 weight % with respect to the maleic anhydride. The polymerization reaction takes place in the absence of other solvents.

High molecular weight copolymers of maleic anhydride and methyl vinyl

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Mannheim, Germany

Istvan Potencsik