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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TL;DR: In this paper, various methods were studied for the oxidation of 2-methyl-5-(phenylsulfonyl)benzenesulfamide and its derivatives, and conditions were proposed for obtaining the desired product in yields up to 95%.
Abstract: Various methods were studied for the oxidation of 2-methyl-5-(phenylsulfonyl)benzenesulfamide and its derivatives. The oxidation by sodium dichromate in sulfuric acid was found most efficient. The effects of temperature, concentration, reagent ratio, and time of the oxidation reaction on the yield of the desired product were investigated. Conditions were proposed for obtaining the desired product in yields up to 95%. A synthesis was developed for a series of new saccharin derivatives.
4 citations
TL;DR: In this article, the authors investigated the aromatic structures present in vitrinite concentrates from Australian coals covering a range of rank and found that only 13 relatively simple aromatic carboxylic acids, principally the di- and triacids of benzene, combined in widely different proportions constituted the oxidation products.
4 citations
Patent•
21 Jul 1981
TL;DR: Chromium trioxide is made by reacting sodium dichromate with sulphuric acid in an aqueous reaction mixture, and the resultant liquor, after separation of the crystals, may be recycled to the reaction mixture consisting of dichromates and sulfuric acid as mentioned in this paper.
Abstract: Chromium trioxide is made by reacting sodium dichromate with sulphuric acid in an aqueous reaction mixture, evaporating the resultant liquor to cause crystallization of most of the chromium trioxide and to cause the concentration of sodium sulphates to be close to but below that at which sulphate crystals start to form, and separating the chromium trioxide crystals from the evaporated liquor. The liquor may then be cooled so as to cause crystallization of sodium sulphates, generally as sodium bisulphate, and the resultant liquor, after separation of the crystals, may be recycled to the reaction mixture containing dichromate and sulphuric acid.
4 citations
Patent•
19 May 2010
TL;DR: In this paper, a method for jointly producing chromium salt and ferrochromium alloy by sintering with the wet-fire methods is described, comprising of four steps: grinding coarse ferro chromium ore into fine finchromium ore powder, mixing the fine ferrochrome ore powder and sodium carbonate into mixture, and sintering the mixture into primary sintered clinker, extracting primary sodium chromate solution from the primary sinterered clinkers and obtaining the left primary chromium slag, and separating, sinting and crushing the primary chrom
Abstract: The invention discloses a method for jointly producing chromium salt and ferrochromium alloy by sintering with the wet-fire methods, comprising the following steps: grinding coarse ferrochromium ore into fine ferrochromium ore powder; mixing the fine ferrochromium ore powder and sodium carbonate into mixture, and sintering the mixture into primary sintered clinker; extracting primary sodium chromate solution from the primary sintered clinker and obtaining the left primary chromium slag; separating, sintering and crushing the primary chromium slag into primary chromium slag powder, and mixing the primary chromium slag powder and sodium carbonate into mixture, and sintering the mixture into secondary sintered clinker; extracting secondary alkaline sodium chromate solution from the secondary sintered clinker and obtaining the left secondary chromium slag; adding acidic solution to neutralize the alkaline sodium chromate solution; adding sodium dichromate to the sodium chromate solution, adjusting the acidifying with sulfuric acid to form sodium dichromate solution, and separating sodium dichromate crystals from the sodium dichromate solution; mixing the secondary chromium slag and iron ore with coke powder and auxiliary materials and sintering the mixture into sintered ore; and mixing the sintered ore and coke in a blast furnace to smelt the ferrochromium alloy.
4 citations
Journal Article•
TL;DR: The Oxidation of m-toluidine by sodium dichromate has been studied both spectrophotometrally and iodometrically in aqueous nitric acid medium and the reaction shows substrate inhibition at low H+ concentration.
Abstract: The Oxidation of m-toluidine by sodium dichromate has been studied both spectrophotometrically (640nm) and iodometrically in aqueous nitric acid medium. The reaction is said to follow consecutive reaction mechanism. The reaction shows substrate inhibition at low H+ concentration. Oxidation proceeds by two routes and both routes give the colored product. Suitable mechanism is proposed. The rate constants, equilibrium constants and kinetic parameters are calculated.
4 citations