Assertion: aldohexose's group | /r/MadeOf | ammonium sulphate
Facets:
value: in an amount
type: OTHER
Source sentences:
text: The above objects are achieved by providing a molybdenum-containing aqueous solution of tungsten wherein the tungsten concentration is proportional to at least five grams tungstic oxide (W0 per liter of solution, maintaining the pH of said solution at from 7.0 to 9.0 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate to precipitate ammonium paratungstate substantially free of molybdenum contaminant.
text: A method for obtaining substantially molybdenum free ammonium paratungstate from molybdenum-containing aqueous solutions of tungsten which comprises providing said molybdenum-containing aqueous solution of tungsten having a tungsten concentration proportional to at least 5 grams tungstic oxide per liter of said solution and having a pH of from 7.0 to 9.0, maintaining said solution at a pH of from 7.0 to 9.0 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulfate to cause precipitation of ammonium paratungstate product substantially free of molybdenum contaminant.
text: The above objects are also achieved by providing a molybdenum-containing aqueous solution of tungsten wherein the tungsten concentration is proportional to at least five grams tungstic oxide (W0 per liter of solution, adjusting or correcting the pH of said solution to and maintaining the pH of said solution at from 7.0 to 9.0 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate to precipitate ammonium paratungstate substantially free of molybdenum contaminant.
text: The above objects are further achieved by providing a molybdenum-containing sodium tungstate solution wherein the tungsten concentration is proportiontal to at least five grams tungstic oxide (W0 per liter of solution, adding to said solution a material selected from the group consisting of ammonium chloride and ammonium sulphate and adding acid to said solution to adjust said solution to and maintain said solution at a pH of 7.0 to 9.0 to precipitate ammonium paratungstate substantially free of molybdenum contaminant.
text: add'm a base to said solution to adjust said solution to and maintain said solution at a pH of 7.0 to 9.0 and adding at to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate to precipitate ammonium paratungstate substantially free of molybdenum contaminant.
text: A method for obtaining substantially molybdenumfree ammonium paratungstate from a molybdenum-containing sodium tungstate solution which comprises providing said sodium tungstate solution having a tungsten con- 5 centration proportional to at least 5 grams tungstic oxide per liter of said solution, adding inorganic acid to said solution to adjust the pH of said solution to and maintain the pH of said solution at a pH of 7.0 to 9.0 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate, to cause precipitation of ammonium paratungstate product substantially free of molybdenum contaminant.
text: A method for obtaining substantially molybdenumfree ammonium paratungstate from a molybdenum-com taining sodium tungstate solution which comprises providing said sodium tungstate solution having a tungsten concentration proportional to at least 5 grams tungstic oxide per liter of said solution, adding inorganic acid to said solution to adjust the pH of said solution to and maintain the pH of said solution at a pH of 7.0 to 9.0 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate in an amount proportional to about 200 to about 300 grams of ammonium chloride per liter of said solution and about 400 to about 600 grams of ammonium sulphate per liter of said solution, to cause precipitation of ammonium paratungstate product substantially free of molybdenum contaminant.
text: A method for obtaining substantially molybdenumfree ammonium paratungstate from a molybdenum-containing sodium tungstate solution which comprises providing said sodium tungstate solution having a tungsten concentration proportional to at least 100 grams tungstic oxide per liter of said solution, adding inorganic acid to said solution to adjust the pH of said solution and maintain the pH of said solution at a pH of 8.0 to 8.5 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate in an amount proportional to about 200 to about 300 grams of ammonium chloride per liter of said solution and about 400 to about 600 grams of ammonium sulphate per liter of said solution, to cause precipitation of ammonium paratungstate product substantially free of molybdenum contaminant.
text: A method for obtaining substantially molybdenum and silica-free ammonium paratungstate from a molybdenum and silica-containing sodium tungstate solution which comprises providing said sodium tungstate solution having a tungsten concentration proportional to at least 5 grams tungstic oxide per liter of said solution, adding to said solution sulfuric acid in an amount to lower the pH of said solution to a value between about 9.0 and about 10.0, digesting said solution for at least one hour at a temperature between about 30 C. and about C. to precipitate silica therefrom, correcting said solution to a pH of 7.0 to 9.0 and adding to said solu: tion at least one material selected from the group consisting of ammonium chloride and ammonium sulphate in an amount proportional to about 200 to about 300 grams of ammonium chloride per liter of said solution and about 400 to about 600 grams of ammonium sulphate per liter of said solution to cause precipitation of ammonium paratungstate product substantially free of molybdenum and silica contaminants.
text: A method for obtaining substantially molybdenum and silica-free ammonium paratungstate from a molybdenum and silica-containing sodium tungstate solution which comprises providing said sodium tungstate solution having a tungsten concentration proportional to at least grams tungstic oxide per liter of said solution, adding to said solution sulfuric acid in an amount to lower the pH of said solution to a value between about 9.0 and about 10.0, digesting said solution for at least one hour at a temperature between about 30 C. and about 90 C. to precipitate silica therefrom and correcting said solution to a pH of 8.0 to 8.5 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate in an amount proportional to about 200 to about 300 grams of ammonium chloride per liter of said solution and about 400 to about 600 grams of ammonium sulphate per liter of said solution to cause precipitation of ammonium paratungstate product substantially free of molybdenum and silica contaminants.
text: A method for obtaining substantially molybdenumfree ammonium paratungstate from a molybdenum-containing sodium tungstate solution which comprises providing said sodium tungstate solution having a tungsten concentration proportional to at least 100 grams tungstic oxide per liter of said solution, adding inorganic acid to said solution to adjust the pH of said solution to and maintain the pH of said solution at a pH of at least 8.5 to 9.0 and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulphate in an amount proportional to about 200 to about 300 grams of ammonium chloride per liter of said solution and about 400 to about 600 grams of ammonium sulphate per liter of said solution to cause precipitation of ammonium paratungstate product substantially free of molybdenum contaminant, removing said product, evaporating ammonia and Water from the remaining filtrate to lower the pH thereof to a lower value and precipitate secondary ammonium paratungstate product therefrom, recycling said secondary product to said sodium tungstate solution.
text: A method for obtaining substantially molybdenum free ammonium paratungstate from molybdenum-containing aqueous solutions of tungsten which comprises providing said bolybdenutn-containing aqueous solution of tungsten having a tungsten concentration proportional to at least 5 grams tungstic oxide per liter of said solution, adjusting the pH of said solution to and maintaining the pH of said solution at a pH of from 7.0 to 9.0 with at least one material selected from the group consisting of inorganic acids and inorganic bases and adding to said solution at least one material selected from the group consisting of ammonium chloride and ammonium sulfate to cause precipitation of ammonium paratungstate substantially free of molybdenum contaminant.