Topic
Sodium dichromate
About: Sodium dichromate is a research topic. Over the lifetime, 421 publications have been published within this topic receiving 6202 citations. The topic is also known as: Disodium salt & sodium bichromate.
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11 citations
Patent•
08 Mar 1943
TL;DR: In this article, a bath composed of sodium dichromate, sodium bisulfate, and sodium nitrate was proposed for treating objects manufactured from gilding-metal, brass, and like metals.
Abstract: This invention relates to a deburring and bright-dipping or polishing process for metal objects and particularly to a novel bath composed of sodium dichromate, sodium bisulfate, and sodium nitrate and its use for treating objects manufactured from gilding-metal, brass, and like metals. Prior...
11 citations
Patent•
10 Jul 2013
TL;DR: In this paper, an adjuvant for coal washing and desulfurizing is described. The adjuant is prepared from the following raw materials in parts by weight: 20-25 parts of NaClO, 12-15 parts of ammonium persulfate (NH4)S2O8, 8-12 parts of sodium glycollate HOCH2COONa.
Abstract: The invention relates to an adjuvant for coal washing and desulfurizing. The adjuvant is prepared from the following raw materials in parts by weight: 20-25 parts of sodium hypochlorite NaClO, 12-15 parts of ammonium persulfate (NH4)S2O8, 8-12 parts of sodium glycollate HOCH2COONa, 6-10 parts of sodium acetate CH3COONa, 7-12 parts of potassium citrate K3C6H5O7H2O, 5-9 parts of sodium gluconate, 5-9 parts of edetic acid, 7-12 parts of potassium permanganate KMnO4, 25-32 parts of methanol CH3OH, 22-30 parts of triethanolamine (HOCH2CH2)3N, 12-16 parts of sodium dichromate Na2Cr2O7, 3-5 parts of polyaluminum ferric chloride PAFC,1-2 parts of urea CON2H4, 1-2 parts of polyacrylamide PAM, 0.5-0.8 part of sodium dodecyl benzene sulfonate C18H29NaO3S, 0.2-0.4 part of dispersing agent JFC and 100-120 parts of water. The adjuvant disclosed by the invention is simple to use, stable in performance and free of large investment and transformation equipment; the removal rate of inorganic sulfur and organic sulfur is more than 70 percent; and the removal rate of nitric oxides is more than 70 percent.
11 citations
Patent•
01 Aug 2012
TL;DR: In this article, the utility model relates to a high-efficiency iron rust conversion agent, and belongs to the field of antirust paint, where the conversion agent comprises the following raw materials by weight: 1-10% of zinc oxide, 20-40% of phosphoric acid, 5-15% of dichromate, 0.5% of metal oxides, 5% of phosphate, 1% of corrosion inhibitor and 50-70% of solvent.
Abstract: The utility model relates to a high-efficiency iron rust conversion agent, and belongs to the field of an antirust paint The iron rust conversion agent comprises the following raw materials by weight: 01-10% of zinc oxide, 20-40% of phosphoric acid, 05-15% of dichromate, 05-10% of phosphate, 01-10% of corrosion inhibitor, and 50-70% of solvent, wherein the dichromate is potassium dichromate or sodium dichromate; the phosphate is sodium phosphate or potassium phosphate; the corrosion inhibitor is urotropine or urea; and the solvent is water or ethanol The preparation method comprises the steps as follows: sequentially adding the solvent, the phosphoric acid, the dichromate, the phosphate, the corrosion inhibitor and the zinc oxide to a glass cup under persistently stirring according to the mass ratio, and dissolving for 10-20 min The production method bases on the dissolving of the solid reactants in the phosphoric acid solution The phosphorized film formed by iron rust conversion has the effects of preventing rust and fixing remnant rust, and the formed phosphorized layer protective film is long-acting, and stable in atmospheric environment, lubricating oil and organic solvent, has high adhesion, can be used as a primer, has dielectric properties, and can prevent electro-chemical corrosion on the metal surface
11 citations
TL;DR: Aqueous sodium dichromate oxidation of 2-bromo-m-xylene (1) under a carbon dioxide pressure gave 2bromoisophthalic acid (58%), while NBSbromination of 1 followed by Sommelet oxidation to aldehyde and then potassium permanganate oxidation enabled the isolation of 2 -3-methylbenzoic acid in 42% yield as discussed by the authors.
Abstract: Aqueous sodium dichromate oxidation of 2-bromo-m-xylene (1) under a carbon dioxide pressure gave 2-bromoisophthalic acid (58%), while NBS-bromination of 1 followed by Sommelet oxidation to aldehyde and then potassium permanganate oxidation enabled the isolation of 2-bromo-3-methylbenzoic acid in 42% yield.
11 citations