US 11,932,588 B2
Process for preparing trialkylammonium dihydrogen phosphates
Jonathan W. Dube, Bowmanville (CA); Christopher Brown, Toronto (CA); Keith Hao-Kiet Huynh, Toronto (CA); and Hitendra Patel, Toronto (CA)
Assigned to ENTEGRIS, INC., Billerica, MA (US)
Filed by ENTEGRIS, INC., Billerica, MA (US)
Filed on Nov. 10, 2022, as Appl. No. 17/984,705.
Claims priority of provisional application 63/281,110, filed on Nov. 19, 2021.
Prior Publication US 2023/0159432 A1, May 25, 2023
Int. Cl. C07C 209/86 (2006.01); C07C 209/68 (2006.01)
CPC C07C 209/86 (2013.01) [C07C 209/68 (2013.01)] 17 Claims
 
1. A process for preparing solid tri(C1-C4 alkyl) ammonium dihydrogen phosphate, the process comprising:
a. combining a C1-C5 alkanol with aqueous phosphoric acid to provide a solution;
b. adding a tri(C1-C4 alkyl)amine to the solution, thereby providing a reaction mixture, while maintaining the temperature of the reaction mixture below its boiling point and while agitating the reaction mixture;
c. adding an aprotic solvent to the reaction mixture; and
d. isolating of the resulting tri(C1-C4 alkyl)ammonium dihydrogen phosphate as a solid.