Method for the production of free flowing synthetic calcium fluoride and use thereof
Assignee3M Innovative Properties Company
InventorsTilman Zipplies, Klaus Hintzer, Thorsten Gerdes, Achim Schmidt-Rodenkirchen, Sebastian Seidl, Thomas Berger
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for producing free-flowing calcium fluoride particles from a diluted aqueous solution of hydrogen fluoride comprising the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50° C. The invention further relates to the use of the free-flowing calcium fluoride particles for the manufacturing of anhydrous hydrogen fluoride.
Claims13
A process for producing free-flowing calcium fluoride particles from an aqueous solution of hydrogen fluoride comprising the step of reacting the aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50° C., further wherein the aqueous solution of hydrogen fluoride has a concentration of hydrogen fluoride of from 0.5 to 40% and the calcium carbonate particles have a mean particle size (d50) of from more than 30 to less than 50 μm.
Dependencies are inferred from the claim text.