Showing papers on "Sodium dichromate published in 1996"
Patent•
15 Apr 1996
TL;DR: Nanofiltration processes using one or more conventional nanofiltration membrane modules under a positive applied pressure is used to selectively change the concentration of one solute, such as sodium chloride or sodium chlorate providing monovalent ions, from another solute such as Sodium sulfate or sodium dichromate to provide multivalent ions in high salt aqueous concentrations.
Abstract: Nanofiltration processes using one or more conventional nanofiltration membrane modules under a positive applied pressure is used to selectively change the concentration of one solute, such as sodium chloride or sodium chlorate providing monovalent ions, from another solute such as sodium sulfate or sodium dichromate to provide multivalent ions in high salt aqueous concentrations. The process is particularly useful in favourably lowering the concentration of undesirable ions, particularly, of silica and dichromate ions in chloralkali and chlorate brine containing solutions and favourably raising the sodium sulphate level relative to sodium chloride in chloralkali liquor.
119 citations
TL;DR: The phase diagram for the ternary system K2Cr2O7 + KNO3 + H2O was determined at four temperatures, (10, 20, 30, and 40) °C as mentioned in this paper.
Abstract: The phase diagram for the ternary system K2Cr2O7 + KNO3 + H2O was determined at four temperatures, (10, 20, 30, and 40) °C. In addition, the densities of the saturated aqueous solutions were measured. The experimental results show that, in the temperature range (10 to 40) °C, only potassium nitrate and potassium dichromate were present as solid phases and that the solubility of KNO3 was almost independent of the K2Cr2O7 concentration, whereas the solubility of K2Cr2O7 decreased sharply with increases in the concentration of KNO3.
34 citations
TL;DR: The origin of chromium base performance materials (CBPMs) is described in this article, where extensive reviews of production processes, properties, and applications/end uses of CBPM are made.
Abstract: The origin of chromium base performance materials (CBPM) is described. CBPM may include (1) trivalent chromium chemicals such as chromic acetate, chromic chloride, chromic bromide, chromic fluoride, chromic iodide, chromic phosphate, and chromic sulfate; (2) hexavalent chromium chemicals such as chromic acid, lithium chromate, sodium chromate, sodium dichromate, and potassium dichromate; (3) oxide forms of chromium such as black chrome, chromium dioxide, chromium oxide, and chromium hydroxide; and (4) other chromium compounds such as chromium aluminide, chromium boride, chromium carbide, chromium molybdate, chromium nitride, chromium silicide, chromium tungstate and lanthanum chromite. Extensive reviews of production processes, properties, and applications/end uses of CBPM are made.
2 citations
TL;DR: The acrolein modified PVA(APVA) was prepared by Michael additon of acro-rolein with PVA as discussed by the authors and showed higher sensitivity than that of conventional PVA-SDC photoresist.
Abstract: The acrolein modified PVA(APVA) was prepared by Michael additon of acrolein with PVA. The new water soluble photoresist that consists of APVA and sodium dichromate(SDC) shows higher sensitivity than that of conventional PVA-SDC photoresist.
2 citations
Patent•
28 Aug 1996
TL;DR: Aniline is polymerized by oxidation at a reaction temperature in the range from -10 to -40{C in aqueous acid solution containing sufficient inert solute to keep it from freezing.
Abstract: Aniline is polymerized by oxidation at a reaction temperature in the range from -10 to -40{C in aqueous acid solution containing sufficient inert solute to keep it from freezing and using a dichromate (preferably sodium dichromate) as the oxidising agent.
2 citations