Potassium nitrate

About: Potassium nitrate is a research topic. Over the lifetime, 3537 publications have been published within this topic receiving 29450 citations. The topic is also known as: Nitric acid, potassium salt & Saltpeter.

Salt Recovery from Wastewater Using Membrane Distillation–Crystallization

Abstract: Osmotic membrane distillation–crystallization is proposed in this study to recover sodium carbonate, potassium nitrate, and sodium sulfate from synthetic industrial solutions leading to valorization of the salts of wastewater coming from gas treatment (flue gases containing CO2, SO2, or NOx) or from brines. The technical viability of the process is discussed in terms of transmembrane fluxes, mass transfer coefficients, and the crystal purity. The effect of concentrations of the feed and osmotic solution, flow rates, and presence of impurities (traces of different salts) was determined as well. The osmotic concentration was the main parameter affecting the transmembrane flux. The concentration of the three salts in the feed had a slight influence, and no effect could be observed by the study of flow rates. Constant mass transfer coefficients were obtained. Two membrane contactors in series were connected to increase the membrane area in order to technically validate one of the main advantages of this kind ...

Constant Composition Dissolution Kinetics Studies of Human Dentin

Abstract: The Constant Composition (CC) method has been used to study the dissolution kinetics of whole powdered human dentin as a function of calcium phosphate concentration at relative undersaturations with respect to hydroxyapatite (σHAP), ranging from +0.8 to -2.8, ionic strength from 0.05 to 0.30 mol/L-1 in sodium chloride or potassium nitrate, pH 4.00 to 5.50, and molar calcium/phosphate ratio in the reaction solutions from 0.05 to 11.1. The results suggest that human dentin behaves as a mixture of at least two calcium phosphate phases, HAP-like and octacalcium phosphate-like, OCP-like. Significant dissolution took place in solutions that were even supersaturated with respect to HAP, and the rates exhibited a striking insensitivity to relative undersaturation, while influenced by ionic strength, pH, and molar calcium/phosphate ratio in the reaction solutions. Although the dissolution was retarded in the presence of magnesium ion, the reaction rate showed the same insensitivity to undersaturation with respect ...

Influence of Potassium Doping on the Activity and the Sulfur Poisoning Resistance of Soot Oxidation Catalysts

Abstract: Soot oxidation on potassium nitrate impregnated cerium oxide and manganese cerium mixed oxide was investigated using TG-FTIR. It was found, that potassium nitrate promotes the soot oxidation by enhancing the contact between the soot and the catalyst, as soot ignition temperature corresponds to the melting point of potassium nitrate for both the individual and the mixed oxide. Since potassium nitrate is easier sulfatized than cerium or manganese, the susceptibility of the catalyst to sulfur poisoning is considerably decreased.