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Sodium hypophosphite

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


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Patent
09 Jan 2013
TL;DR: In this paper, a preparation method of a sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution is described, where deionized water and sodium hypophosphite are added into a reactor and continuously stirred for dissolving to prepare a solution of sodium hypphosphite, and the solution is heated to 60-110 DEG C at the same time.
Abstract: The invention discloses a preparation method of a sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution The method comprises the following steps: solution preparation: deionized water and sodium hypophosphite are added into a reactor and continuously stirred for dissolving to prepare a solution of sodium hypophosphite, and the solution is heated to 60-110 DEG C at the same time; polymerization: acrylic acid monomer, an initiator and sodium hypophosphite are sequentially dripped into the solution prepared in the step of the solution preparation for 05-5h, constant-temperature reaction is carried out for 05-5h after the dripping to obtain a mixture, an alkali is added to neutralize the mixture to neutrality after the reaction is completed The method uses sodium hypophosphite as the chain transfer agent to prepare the aqueous solution of sodium polyacrylate, wherein the solid content of the aqueous solution is greater than or equal to 450%, the weight molecular weight of the aqueous solution is 1000-10000, and the molecular weight distribution of the aqueous solution is 17-25 The aqueous solution of sodium polyacrylate has higher chelating ability, dispersion force and antiredeposition ability, and can partly or completely replace sodium tripolyphosphate to be used in washing products to reduce pollutions of detergents to the environment

4 citations

Patent
19 Mar 2008
TL;DR: In this article, a method which prepared tetrakis (hydroxymethyl) phosphonium sulfate by utilizing the phosphine generated in the process of producing sodium hypophosphite was presented.
Abstract: The present invention relates to a method which prepares tetrakis (hydroxymethyl) phosphonium sulfate by utilizing the phosphine generated in the process of producing sodium hypophosphite. From the waste gas generated in the process of producing the sodium hypophosphite, the phosphine is collected and stored; aqueous solution is prepared with formaldehyde and sulfuric acid according to the molar ratio of 8.1 to 8.2:1; the aqueous solution is pumped into an absorption column by an erosion-resistant pump and is sprayed down from the top of the column, the phosphine gas in a gas vessel is pumped into the absorption column by a gas pump, and under the condition of temperature between 40 DEG C and 50 DEG C, a synthesis reaction is carried out, so that the aqueous solution of the tetrakis (hydroxymethyl) phosphonium sulfate is prepared. The tetrakis (hydroxymethyl) phosphonium sulfate (THPS) prepared with the harmful gas (phosphine) generated in the process of producing sodium hypophosphite is a quaternary alkylphosphonium salt bactericidal algicide, which has the advantages of high efficiency, broad spectrum, low toxicity, low dosage, low foamability and environmental protection. The tetrakis (hydroxymethyl) phosphonium sulfate can be biologically self-degraded, so no environmental pollution occurs. The present invention resolves the problem of environmental pollution caused by the waste gas generated in the process of producing sodium hypophosphite.

4 citations

Patent
10 Aug 2011
TL;DR: In this paper, a scale inhibition and dispersion agent with excellent calcium carbonate scale inhibition performance and a certain calcium phosphate scale dispersion performance is prepared from maleic anhydride monomers and sulfamic acid monomers under the action of a catalyst in a peroxide and sodium hypophosphite initiation system.
Abstract: The invention discloses a novel scale inhibition and dispersion agent. The novel scale inhibition and dispersion agent with excellent calcium carbonate scale inhibition performance and a certain calcium phosphate scale dispersion performance is prepared from maleic anhydride monomers and sulfamic acid monomers under the action of a catalyst in a peroxide and sodium hypophosphite initiation system. The scale inhibition and dispersion agent product has simple reaction process and stable and reliable technique. No three wastes are discharged, and environment pollution is not caused.

4 citations

Journal ArticleDOI
TL;DR: In this paper, a new bath formulation, uniform and fine grained ternary deposits were obtained using a minimum amount of wetting agents and stress relieving additives, and soft magnetic layers were obtained when deposits were grown at low deposition rates (temperature of 30°C and low current densities).
Abstract: The electrodeposition technique has allowed the preparation of micrometre scale films of cobalt–nickel–phosphorus with different magnetic properties which are a function of the electrolytic bath composition, the current density applied and the bath temperature. The deposits were obtained from solutions containing nickel (II) and cobalt (II) sulphamates and sodium hypophosphite as a source of phosphorus. From a new bath formulation, uniform and fine grained ternary deposits were obtained using a minimum amount of wetting agents and stress relieving additives. Soft magnetic layers were obtained when deposits were grown at low deposition rates (temperature of 30°C and low current densities). Increases in both bath temperature and applied current density led to deposits losing their soft magnetic behaviour.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202315
202234
202125
202051
2019116
201890