Using Novel Amines to Stabilize Quaternary Trialkylalkanolamines
AssigneeHuntsman Petrochemical Corporation
InventorDave C. Ferguson
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Abstract
New stabilizers for solutions of choline hydroxide and related quaternary trialkylalkanolamines are disclosed. The stabilizers are alkyl hydroxylamines, hydrazines, hydrazides, or derivates thereof, including compounds containing more than one such functionality. The new stabilizers are effective at concentrations less than about 1000 ppm, and choline hydroxide solutions stabilized with the compounds described herein typically have Gardner Color change less than about 2.0 after six months at reasonable temperatures.
Claims21
A composition comprising a quaternary trialkylalkanolamine in a water-containing solvent at a concentration between about 0.1 wt % and about 80 wt % with a stabilizer selected from the group consisting of an alkyl hydroxylamine, a hydrazide, a hydrazine, and a mixture thereof.
A composition comprising a quaternary trialkylalkanolamine and a stabilizer selected from the group consisting of an alkyl hydroxylamine, a hydrazide, a hydrazine, and a mixture thereof.
A method of stabilizing a quaternary trialkanolamine solution comprising:
- providing a liquid stabilizer comprising a dialkylhydroxylamine, a hydrazide, a hydrazine, or a derivative thereof;
- and
- blending the liquid stabilizer with the quaternary trialkanolamine solution to form a stabilized solution.
A method of forming a stabilized quaternary trialkylethanolamine solution, comprising blending a quaternary trialkylethanolamine solution with an aldehyde scavenger stabilizer in an amount such that the stabilized quaternary trialkylethanolamine solution has a concentration of the stabilizer that is less than about 1000 ppm.
Dependencies are inferred from the claim text.