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US 6,603,042 B2Granted
Anhydride stabilization
AssigneeHuntsman Petrochemical Corporation
InventorHenry C. Brown
Life of this patent
Estimating the term…
Abstract
Disclosed herein are compositions comprising organic anhydrides having a reduced tendency to discolor with time, even when held at elevated temperatures for extended times. The compositions are produced by mixing at least one acid halide and various derivatives of hydroxy carboxylic acids with an anhydride to form a homogenous solution. Also disclosed is a process for preparing the compositions.
Claims10
A process for stabilizing organic acid anhydrides against color changes which comprises the steps of:
- a) providing an organic acid anhydride;
- b) contacting said anhydride with an acid halide of a carboxylic acid;
- and
- c) contacting said anhydride with a derivative of a hydroxy carboxylic acid.
1 more element
A process for stabilizing organic acid anhydrides against color changes which comprises the steps of:
- a) providing an organic acid anhydride in the liquid state;
- b) causing an acid halide of a carboxylic acid to exist within said anhydride in the liquid state to form a first mixture;
- c) causing at least one derivative of a hydroxy carboxylic acid to exist within said first mixture so as to form a final mixture;
- and
- d) effecting agitation sufficient to render said final mixture at least reasonably homogeneous.
2 more elements
Dependencies are inferred from the claim text.