Abstract: Aqueous media, e.g., potable waters, are treated/purified by flocculation utilizing, as the flocculant therefor, that flocculating adjuvant adapted for ready dispersion/dissolution in such media comprising intimate admixture of a water soluble gum, polymer or biogum heteropolysaccharide, a dispersion/dissolution enhancing amount of a water donor material, and, advantageously, an anionic and/or nonionic surfactant.

Abstract: A water treatment process is provided wherein water of a pH in the range of about 6 to 9 is treated with a flocculating agent, most preferably, an iron or aluminum comprising flocculating agent, and a flocculation additive comprising a heteropolysaccharide generated by the action of bacteria of the genus Xanthomonas or Arthrobacter, or fungi of the genus Sclerotium. The flocculating agent is added initially to the water, with the heteropolysaccharide comprising flocculation additive being added subsequent thereto. The process finds particular utility in the purification of potable waters.

Abstract: Aqueous solutions of anthocyans are purified by contacting same with a particular, metallic oxide adsorbent, said adsorbent being coated with a thin film of a styrene polymer, and thence by separating the adsorbent and treating it with an eluant. The eluate and the dry, powdery anthocyans which can be obtained therefrom are useful red, blue and violet industrial colorants, especially food colorants.

Abstract: Enzyme-support complexes in which the enzymes are bound by covalent bonding to at least one reactive function of organic groups grafted to mineral supports by at least one ester bond. The complexes are obtained by reacting an insoluble inorganic support having hydroxyl groups with a compound formed of an organic group having at least one alcohol or phenol function and at least one reactive function, to which the enzyme is then bonded.

Abstract: Foundry mold and core compositions comprising sand, a silicate binder and a hardening agent include an alumina "demolding" agent having an average grain size distribution of less than 40.mu., preferably between 0.2 and 5.mu..

Abstract: Catalysts for hardening aqueous alkali metal silicate solutions comprising mixtures of alkylene carbonate and methyl esters of organic acids are disclosed. The hardening catalysts are primarily useful in the production of high quality foundry molds and cores based on alkali metal silicate binders.

Abstract: Aminoacylase is absorbed on a porous inorganic support that has been coated with a film of cross-linked polymer containing tertiary amine or quaternary ammonium salt groups to provide support-aminoacylase complexes for use in the separation of racemic acetylamino-acids.

Abstract: Modified porous mineral carriers in which the surfaces are covered by a cross-linking polymer formed by reaction of at least one polyamine with at least one epoxide compound.

Abstract: Solid catalyst, insoluble in organic and aqueous solvents and having the general formula:A -- M (L').sub.n (L").sub.qin which A is an insoluble ligand, M is a Group VIII noble metal, L' and L" are ligands and n and q are intergers of 0 to 6 are provided for the advantageous catalysis of hydroformylation, and hydrogenation of olefins and the preparation of tertiary amines from olefins.

Abstract: A method of separating proteins by ion exchange comprising putting a solution of proteins into contact with an ion exchange resin consisting of a porous inorganic carrier coated with a cross-linked polymer containing or carrying anion exchanging groups -- tertiary amines or salts of quaternary ammonium -- or cation exchanging groups and application of the process to the food, pharmaceutical and veterinary field.

Abstract: The invention concerns mineral carriers carrying modified silicon grafts. They comprise mineral carriers grafted by silicon derivatives with aromatic amino substituents, modified by substituted or unsubstituted adenine radicals. The carriers are used in chromatography and more particularly in affinity chromatography for the purification of enzymes.

Abstract: Aromatic amino silanes having 1, 2 and 3 hydrolyzable groups and polymers thereof in which corresponding nitrophenols are hydrogenated in the presence of a catalyst at a temperature below 30.degree. C in which compounds having 2 to 3 hydrolyzable groups produce polymers suitable for use in the preparation of silica and alumina grafts and the compounds having one hydrolyzable group are suitable for use as colorants and the synthesis of polymers.

Abstract: The invention concerns grafted mineral carriers comprising oxides, hydroxides and other insoluble, porous mineral compounds, upon which are grafted haloalkylsilane groups which may or may not be substituted and whose alkyl residue comprises from 3 to 11 carbon atoms. They are used as industrial catalyst carriers, in chromatography and more particularly for fixing enzymes.

Abstract: Bodies formed of porous, divided or colloidal inorganic material containing surface hydroxyl groups which are modified by grafting to the surface an organic group to establish an --O--Si bond, wherein the organic group has an average molecular weight greater than 150 and contains at least one hydrophilic functional group. The bodies of this invention are well suited for use in chromatography.

Abstract: An ion exchange substance formed of a porous mineral support having a specific surface area greater than 10 sq.m/g and an organo silicon compound containing at least one amine group in an organic group attached to the silicon atom grafted onto the porous mineral support via the silicon atom of the organo silicon compound and an oxygen group on the support and in which the terminal radicals on the amino group are alkyl groups having from 1 to 3 carbon atoms.

Abstract: Process for the separation and purification of d-aminoacid oxidase by affinity chromatography. The process comprises contacting a mixture of proteins containing the d-aminoacid oxidase with a mineral carrier carrying haloalkylsilane grafts, upon which are fixed -- NH -- (CH.sub.2).sub.3 -- NH -- (CH.sub.2).sub.2 C.sub.6 H.sub.4 COOH residues. The enzyme retained by the carrier is then separated by a solution of ethyleneglycol. Use of the pure d-aminoacid oxidase for the preparation of cetonic acids.