Method of preparing quaternary ammonium hydroxide and...

Details Method of preparing quaternary ammonium hydroxide and... Method of preparing quaternary ammonium hydroxide and...

2006-06-06

2006-06-06

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C564S281000

Reexamination Certificate

active

07057070

ABSTRACT:
This invention provides a method of preparing a quaternary ammonium hydroxide compound having the formula (NR1R2R3R4)OH, wherein R1and R2are independently C1–C4alkyl; R3is benzyl or a C1–C20alkyl or a C1–C20aryl-sutstituted alkyl; R4is a C8–C20alkyl. The method includes the step of reacting a quaternary ammonium compound having the formula (NR1R2R3R4)+X−, wherein R1, R2, R3, and R4are as defined above and X is Br or Cl, with a metal hydroxide in an aminoalcohol solvent to yield the quaternary ammonium hydroxide. The reaction forms metal bromide and/or metal chloride as a byproduct. The metal byproducts and excess metal hydroxide (if any) can be removed by methods known in the art. According to one preferred embodiment, the reaction of the quaternary ammonium compound with the metal hydroxide is performed in an anhydrous environment (i.e., with no water present).

REFERENCES:
patent: 5523487 (1996-06-01), Walker
patent: 5760088 (1998-06-01), Walker

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