摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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..
摘要:
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. SPECIFICATION
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.