US 11,718,523 B2
Method for producing hydrogen fluoride
Arata Sasatani, Settsu (JP); Toshiyuki Kinoshita, Settsu (JP); Toshikazu Yoshimura, Settsu (JP); Akikazu Tabuchi, Settsu (JP); and Masayoshi Imoto, Settsu (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jan. 27, 2021, as Appl. No. 17/159,844.
Application 17/159,844 is a division of application No. 15/325,361, granted, now 10,934,166, previously published as PCT/JP2015/069127, filed on Jul. 2, 2015.
Claims priority of application No. 2014-143222 (JP), filed on Jul. 11, 2014.
Prior Publication US 2021/0147230 A1, May 20, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C01B 7/19 (2006.01); C01B 9/08 (2006.01)
CPC C01B 7/191 (2013.01) [C01B 7/192 (2013.01); C01B 9/08 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for producing hydrogen fluoride by reacting calcium fluoride and sulfuric acid, the method comprising:
(a) mixing and reacting calcium fluoride and sulfuric acid such that a mixture comprising calcium fluoride particles and sulfuric acid substantially maintains a particulate form to obtain hydrogen fluoride while supplying sulfuric acid to the calcium fluoride particles at a flow rate of 0.002 to 0.07 mol/min relative to 1 mol of calcium fluoride to such an amount that a molar ratio of sulfuric acid/calcium fluoride is 0.9 to 1.1,
wherein the mixing in step (a) is continued after finishing the supply of sulfuric acid until the reaction between calcium fluoride and sulfuric acid is completed.