Sodium hypophosphite

About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.

Carbodiimide catalysis in cross-linking of cotton cellulose with 1,2,3,4-butanetetracarboxylic acid

Abstract: This study examined carbodiimde catalysis (cyanamide, dicyandiamide, disodium cyanamide) in the cross-linking of cotton cellulose with 1,2,3,4-butanetetracarboxylic acid (BTCA). Considerable improvement in the smooth drying appearance of the treated cotton substantiated the fact that cellulose cross-linking has been achieved by BTCA in the presence of carbodiimide. Bath pH was a very important factor in determining the performance properties of the treated cotton. Two possible reaction mechanisms were proposed: direct esterification and anhydride intermediate formation. Both pathways involved the formation of urea. Semiquantitative analyses of the spectra obtained by Fourier transform infrared spectroscopy revealed that the cyanamide was somewhat less effective than were dicyandiamide and sodium hypophosphite in esterification efficiency. © 1995 John Wiley & Sons, Inc.

Nickel recovery process

Abstract: The invention relates to a process for recovering nickel from industrial effluents, characterized in that a) the effluent loaded with nickel is allowed to settle in a corrugated-plate separator (1) for the removal of solid constituents contained therein, b) a flocculant is added and the mixture is neutralized with alkali or mineral acid, c) after flocculation, the mixture is again allowed to settle in a corrugated-plate separator (3) and d) filtered through a sand filter (4), e) the filtered effluent is passed through a sequestering cation exchanger system containing three exchanger columns, the first column (5) being loaded up to breakthrough of nickel, the second column (6) serving as a guard filter and the third column (7) being regenerated or standing by in the freshly regenerated state, f) the particular column loaded with nickel is regenerated with dilute mineral acid, and g) the regenerate is treated with sodium hypophosphite in the presence of catalytic quantities of sodium borohydride, and to equipment for carrying out this process

Process for production of nanoparticles of solid lubricant and lubricant dispersions stable in oil and in water

Abstract: The process basically comprises: dissolving a lamellar disulphide, as a source of the solid lubricant, in an aqueous solvent, forming a first aqueous solution; dissolving a reducing agent, as hydroxylamine, sodium hypophosphite or sodium borohydride, in an aqueous solvent, forming a second aqueous solution; mixing the first and second aqueous solutions, forming a third aqueous solution; neutralizing the pH of the third aqueous solution; dissolving a sulphur source, in an aqueous solvent, forming a fourth aqueous solution; mixing the third and fourth aqueous solutions, forming a fifth aqueous solution, which is contained and heated in an autoclave; cooling the fifth aqueous solution to the room temperature; and removing, from the autoclave, the nanoparticles in powder form.

Low-temperature chemical Ni-Cu-P plating solution and chemical Ni-Cu-P plating method applying the solution

Abstract: The invention relates to chemical plating on the surface of a metal material, in particular to a low-temperature ultrasonic wave assisted chemical Ni-Cu-P plating solution used for the surface of a low-carbon steel base material as well as a chemical Ni-Cu-P plating method. The characteristics include adopting nickel sulfate and copper sulfate as the main salt of the plating solution, sodium hypophosphite as a reducing agent, sodium acetate as a buffer, trisodium citrate and lactic acid as complexing agents, succinic acid and glycine as well as ammonium hydrogen fluoride as combined accelerators, potassium iodide and thiourea as stabilizers to prepare the chemical Ni-Cu-P plating solution, and applying the chemical Ni-Cu-P plating solution on the surface of a low-carbon steel substrate by low-temperature ultrasonic wave chemical plating. In the invention, the formula of the plating solution is environment-friendly, meets the environment-friendly requirement of clean production and reduces pollution to environment. The method for chemically plating Ni-Cu-P on the surface of the low-carbon steel substrate obviously lowers the plating application temperature, enables the deposition speed to be fast and effectively improves the performance of the low-carbon steel substrate.

Chemical plating solutions

Abstract: AN AQUEOUS CHEMICAL PLATING SOLUTION FOR DEPOSITING A METAL SUCH AS NICKEL, COBALT, COPPER OR IRON ON A CATALYTIC SUBSTRATE, USING A REDUCING AGENT SUCH AS FORMALDEHYDE, SODIUM HYPOPHOSPHITE OR A BORANE, PARTICULARLY AN ALKALI METAL BOROHYDRIDE, IS STABILIZED AGAINST DECOMPOSITION BY CONTAINING THEREIN AN ALKALI METAL CYANOBOROHYDRIDE.