61results about "Manganese nitrates" patented technology

Methods and systems for regenerating and pretreating oxides of manganese and precipitation of oxides of manganese from manganese salt solutions. Oxides of manganese, a slurry containing oxides of manganese or manganese salt solutions are mixed with heated aqueous oxidizing solutions and processed in a continuous process reactor. Temperature, pressure, Eh value, and pH value of the mixed solution are monitored and adjusted so as to maintain solution conditions within the MnO2 stability area during processing. This results in regenerated, pretreated and precipitated oxides of manganese having high or increased pollutant loading capacities and / or oxidation states. Oxides of manganese thus produced are, amongst other uses; suitable for use as a sorbent for capturing or removing target pollutants from industrial gas streams. Filtrate process streams containing useful and recoverable value present as spectator ions may be further processed to produce useful and marketable by-products.

The invention relates to a method for preparing a hydrogenation catalyst which can change the property of the surface of IIB group metallic oxide. The invention adds the zinc via immersion method, and the carrier is avoided high temperature sintering process after the immersion with zinc solution and dried, and before loading the hydrogenation active metal. Compared to present technique, the invention avoids the high temperature process after adding zinc element and before adding hydrogenation metal, to decrease the reciprocity between the zinc and carrier, which avails the regulation on the reciprocity between hydrogenation metal and carrier. In addition, the inventive method has simple process, lower power consumption, easy operation and lower producing cost. The invention can be used in the reaction of hydrogenation refining, and hydrogenation cracking of hydrocarbon, which has higher activity and selectivity than present catalyst.

Described is a catalyst and process useful in the hydrodesulfurization of a distillate feedstock to manufacture a low-sulfur distillate product. The catalyst comprises a calcined mixture of inorganic oxide material, a high concentration of a molybdenum component, and a high concentration of a Group VIII metal component. The mixture that is calcined to form the calcined mixture comprises molybdenum trioxide, a Group VIII metal compound, and an inorganic oxide material. The catalyst is made by mixing the aforementioned starting materials and forming therefrom an agglomerate that is calcined to yield the calcined mixture that may be used as the catalyst or catalyst precursor.

The invention provides a high-purity manganous nitrate and a preparation method thereof. The method comprises the following steps: (1) sulfuration, adding the mixed gas containing ammonia gas and hydrogen sulfide into a manganese sulfate solution of 150-300g / L to conduct a sulfuration reaction until the concentration of Mn<2+> in the solution is less than 500ppm, then stopping the reaction, conducting solid-liquid separation, and then washing an obtained manganese sulfate filter cake for later use; (2) acidification, adding nitric acid into the manganese sulfate filter cake obtained in the sulfuration step (1) at the nitrogen atmosphere, keeping the temperature of a reaction system to be less than 50 DEG C, and using hydrogen sulfide produced in a nitrogen displacement reaction in the reaction process; stirring, reacting until the pH value is 3.5-4.0, stopping adding acid, then conducting solid-liquid separation, and the obtained filtrate is a manganous nitrate product. The preparation method adopts a manganese sulfide-nitric acid process route to obtain the high-purity manganous nitrate product with low content of heavy metals, and the process cost is lowered.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and napier grass powder into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and wood sawdust into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and rice bran into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and reed powder into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and bamboo sawdust into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.