摘要:
It is provided that a method for preparing disodium paraperiodate, characterized in that a pH of a reaction mixture which is obtained by reacting sodium iodate, iodic acid or a mixture thereof with sodium hypochlorite using sodium hydroxide is adjusted to the range between 5 and 10.
摘要:
The invention pertains to a process for the regeneration and recovery of periodate from a spent iodate solution, by reacting the iodate with at least an equimolar amount of hypohalite, and carrying out the recovery in the presence of a water-miscible organic solvent or potassium ions or divalent metal (especially calcium) ions. The regenerated periodate is especially suitable for oxidising carbohydrates to dialdehyde carbohydrates.
摘要:
The present invention is compositions, methods of use, methods of treating, and articles of manufacture that include at least one silver iodate for imparting antimicrobial properties, particularly as it relates to the manufacture, use, and properties of medical devices. The invention also includes obtaining and using one or more silver iodate reaction products from a diperiodatoargentate, wherein the reaction products are obtained using a hydrothermal reaction.
摘要:
Disclosed is a basic aluminum material having enhanced antiperspirant activity, the material having the empirical formula Al₂(OH) 6-a X a , where 0.5 ≦ a ≦ 5.0, and X is a univalent complex oxoanion of nitrogen, chlorine and other halogens, which forms salts with Al³⁺ in aqueous solution so that these salts are essentially completely dissociated, which is readily soluble in water with metallic ions in the solution, and which forms conjugate acids that are strong acids; and wherein the material is characterized by: (a) size exclusion high performance liquid chromatography peaks corresponding to peak 3 and peak 4 of size exclusion chromatograms formed by HPLC technique; (b) a peak 4 relative area of at least 25%, a peak 3 relative area of less than 60%, the sum of the relative peak 3 and peak 4 areas being at least 50%; and (c) less than 10% chromatographic peaks eluting at shorter retention times than peak 3, corresponding to peaks 1 and 2. Illustratively, the univalent oxoanion can be ClO₃⁻, ClO₄⁻, IO₄⁻, and preferably NO₃⁻. The material is characterized by having et least 25% by weight thereof in the form of Al b polyhydroxyaquoaluminum species. Also disclosed are antiperspirant compositions including the basic aluminum material, a zirconium, hafnium, titanium and/or tin antiperspirant active material and a neutral amino acid, and methods of forming the basic aluminum material and the antiperspirant composition. The basic aluminum material can be formed at relatively low temperatures, without first forming a dilute solution of a basic aluminum compound, and the basic aluminum material has a stable enhanced activity in aqueous solution over a relatively long period of time.
摘要:
Disclosed is a basic aluminum material having enhanced antiperspirant activity, the material having the empirical formula Al₂(OH) 6-a X a , where 0.5 ≦ a ≦ 5.0, and X is a univalent complex oxoanion of nitrogen, chlorine and other halogens, which does not form strong coordination compounds with Al³⁺ so that non-hydrolyzed aqueous monomeric aluminum solutions containing the anion are essentially completely dissociated, and which are readily soluble in water with metallic ions in the solution; and wherein the material is characterized by:
(a) size exclusion high performance liquid chromatography peaks corresponding to peak 3 and peak 4 of size exclusion chromatograms formed by HPLC technique; (b) a peak 4 relative area of at least 40%, a peak 3 relative area of less than 50%, the sum of the relative peak 3 and peak 4 areas being at least 50%; and (c) less than 10% chromatographic peaks eluting at shorter retention times than peak 3, corresponding to peaks 1 and 2.