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.
Papers published on a yearly basis
Papers
More filters
Patent•
20 Apr 2011
TL;DR: In this article, a method for preparing sodium dichromate from potassium chromate by taking barium chromate as an intermediate is presented. But the method is not suitable for high temperature and humidity conditions.
Abstract: The invention relates to a method for preparing sodium dichromate from potassium chromate by taking barium chromate as an intermediate. The method comprises the following steps: 1) mixing K2CrO4 with BaO at molar ratio of 1:(0.5-2) to obtain BaCrO4 sediment and a KOH solution, and then carrying out solid-liquid separation; 2) recycling the KOH solution obtained in step 1); 3) mixing the obtained BaCrO4 in step 1) and sodium salt at ratio of 1:(0.5-2), stirring and adjusting the pH value to 1-7 to obtain sodium salt sediment and a Na2Cr2O7 solution, then carrying out solid-liquid separation; 4) roasting the sodium salt sediment obtained in the step 3) to obtain BaO, returning the BaO to the step 1) for recycling; and 5) evaporating the Na2Cr2O7 obtained in the step 3) to obtain a Na2Cr2O7 concentrated solution and crystallizing to obtain Na2Cr2O7 crystal and mother liquor, and returning the mother liquor to the step 3) for recycling. The method provided by the invention has the advantages that the K2CrO4 product is taken as a raw material, and the conversion from potassium chromate products to the sodium dichromate products is realized by controlling conditions; the conversion conditions are mild; operability is strong; and requirements on devices are simple.
1 citations
TL;DR: In this paper, the magnetic susceptibility of Ammonium dichromate, Sodium dichromates, Potassium chromate and Potassium permanganate in state of solution has been determined with the help of a very sensitive and accurate microbalance.
Abstract: The magnetic susceptibility of Ammonium dichromate, Sodium dichromate, Potassium chromate and Potassium Permanganate in state of solution has been determined with the help of a very sensitive and accurate microbalance. The values so obtained have been compared with the calculated ones in accordance the additive law. The deviation between the observed and calculated values has been attributed to the effect of the electric field due to distant atoms on the paramagnetic ion and the change of the ionic radii. The change in the moment values in state of solution indicates that in acqueous solution, hydrogen ion concentration is a highly disturbing source. The higher moment values in state of solution than in crystalline state predict the absence of the long range field and thus a release of a part of quenched magnetic moment is resulted.
1 citations
1 citations
TL;DR: When crystals of sodium dichromate dihydrate are heated at 1 atm pressure, the phase change Na2Cr2O7,2H2O → Na2cr2O 7,H 2O + saturated solution occurs at 82.8°C with the absorption of 17.6±0.95 kJ per mole of dihydrates as discussed by the authors.
Abstract: When crystals of sodium dichromate dihydrate are heated at 1 atm pressure, the phase change Na2Cr2O7,2H2O → Na2Cr2O7,H2O + saturated solution occurs at 82.8°C with the absorption of 17.6±0.95 kJ per mole of dihydrate. A second phase change Na2Cr2O7,H2O → Na2Cr2O7 + saturated solution occurs at 91.1°C with the absorption of a further 12.4±1.5 kJ per mole of dihydrate.
1 citations
TL;DR: A ratiotracer study with chromium-51 labeled sodium dichromate revealed 97.2% of the chromium in preserved milk was in the water phase while 2.8% was associated with the proteins, 2.2 percent with the casein and.6% with the whey proteins.
1 citations