Hoechst Aktiengesellschaft

Albert Schlegel

Peter Wirtz

Aqueous solutions containing phosphate, aluminum and iron are evaporated. Thus, acidic phosphates having an atomic ratio Al:Fe of 95:5 to 5:95 and an atomic ratio P:(Al+Fe) of 1.1:1 to 3:1 are obtained. These are thermally treated by heating them in a first step to a temperature not exceeding 400.degree. C. until their weight remains constant, and in a second step to a temperature not exceeding 750.degree. C., likewise until their weight remains constant. The tempered phosphate so obtained is suitable as hardener for water glass cements.

Hardener for water glass cements

A process is disclosed for deodorizing protein hydrolysates which are used for making air foam. Protein is hydrolyzed by known methods in the absence of heavy metal salts. Then an epoxide is added until blackening occurs when a spot-test is carried out with lead acetate paper.

Process for deodorizing foaming agents for the manufacture of air foams

Crystalline AlH.sub.3 (PO.sub.4).sub.2 .multidot.3H.sub.2 O is obtained from an aqueous solution of aluminum phosphate containing a molar ratio of Al.sub.2 O.sub.3 :P.sub.2 O.sub.5 of from 1:2 to 1:6 and an organic solvent that is miscible with water. Crystallization is enhanced by the addition of AlH.sub.3 (PO.sub.4).sub.2 .multidot.3H.sub.2 O seed crystals to the aqueous solution. The product is useful in reducing the setting time of hydraulic binders.

Process for preparing AlH.sub.3 (PO.sub.4).sub.2 .multidot.3H.sub.2 O

Crystalline AlH.sub.3 (PO.sub.4).sub.2.3H.sub.2 O is obtained from an aqueous solution of aluminum phosphate containing a molar ratio of Al.sub.2 O.sub.3 :P.sub.2 O.sub.5 of from 1:2 to 1:6 and an organic solvent that is miscible with water. The product is useful in diminishing the setting time of hydraulic binders.

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Frankfurt-am-Main, Germany

Albert Schlegel