Synthesis of 3,3,-dimethylbutyraldehyde by the reduction of 3,3,-dimethylbutyric acid
AssigneeThe NutraSweet Company
InventorsIndra Prakash, Robert L. Augustine, Setrak K. Tanielyan
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Abstract
A process for the production of 3,3-dimethylbutyraldehyde is disclosed. The 3,3-dimethylbutyraldehyde is obtained by the reduction of 3,3-dimethylbutyric acid using trimethylacetic anhydride and a phosphine. The 3,3-dimethylbutyric acid is preferably obtained by a process in which tert-butanol and vinylidene chloride are reacted in the presence of sulfuric acid. The disclosed process has improved cost and yield.
Claims18
A process for the synthesis of 3,3-dimethylbutyraldehyde, comprising the steps reacting 3,3-dimethylbutyric acid with hydrogen, in the presence of a catalyst, a solvent, dehydrating means and a ligand or catalyst modifier at a temperature and pressure effective to produce 3,3-dimethylbutyraldehyde.
A method of producing 3,3-dimethylbutyraldehyde comprising the steps of:
- (a) reacting tert-butanol and vinylidene chloride in a vessel in the presence of an acid to produce 3,3-dimethylbutyric acid;
- (b) purifying said 3,3-dimethylbutyric acid using a purification process selected from the group comprising distillation, batch fractional distillation, continuous fractional distillation, or extraction or distillation by means of a thin-film evaporator;
- (c) adding to said vessel hydrogen, in the presence of a catalyst, a solvent, dehydrating agent and a ligand or catalyst modifier at a temperature and pressure effective to produce 3,3-dimethylbutyraldehyde;
- (d) purifying said 3,3-dimethylbutyraldehyde using a purification process selected from the group comprising batch fractional distillation, continuous fractional distillation, or extraction or distillation by means of a thin-film evaporator.
Dependencies are inferred from the claim text.