Patent Number: 6,166,255

Title: Production of tertiary amine oxides

Abstract: Exothermic oxidation of tertiary amine with aqueous hydrogen peroxide in an aqueous reaction medium formed or being formed from tertiary amine, aqueous hydrogen peroxide, carbon dioxide, and optionally chelating agent and/or additional water, is initiated at about 15 to about C., and while agitating the reaction mixture, the temperature is allowed to rise adiabatically to a temperature in the range of about 50 to about C. In this way, it is possible to produce tertiary amine oxides with very low levels, if any, of nitrosamine impurity, without addition of metal and/or phosphorus-containing components recommended in the prior art. Even though a substantial portion of the reaction is performed at temperatures in the range of about C., nitrosamine content, if any, in the resultant tertiary amine oxide product can be well below 30 ppb, and the free amine content, if any, can be well below 0.3 wt %. Use of such relatively exothermically achieved high temperatures in turn results in faster reaction rates and enables use of shorter reaction periods.

Inventors: Cochran; Rebecca S. (Baton Rouge, LA), Wight; Andrea P. (Baton Rouge, LA), Krzystowczyk; Douglas H. (Orangeburg, SC), Thomas; Dustin H. (Baton Rouge, LA)

Assignee: Albemarle Corporation

International Classification: C07C 291/00 (20060101); C07C 291/04 (20060101); C07C 291/04 (); C07C 209/68 ()

Expiration Date: 12/26/2017