Trimethylhexanoic Acid Purification for Sulfuric Acid Color Stability
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Solution Overview
Problem
Existing methods of purifying 3,5,5-trimethylhexanoic acid fail to eliminate sulfuric acid coloring due to the presence of t-butyl alcohol, despite distillation, which degrades the sulfuric acid coloring evaluation.
Innovation Solution
A 3,5,5-trimethylhexanoic acid composition containing t-butyl alcohol, with a concentration adjusted to 200 ppb by volume or less, is produced through a synthesis and purification process involving hydroformylation, oxidation, distillation, water washing, and bubbling with an inert gas to minimize t-butyl alcohol content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to purify 3,5,5-trimethylhexanoic acid and reduce aldehyde impurities, then the purity of the acid is improved, but the sulfuric acid coloring evaluation deteriorates due to remaining t-butyl alcohol
Solution Approach 1:
The patent extracts and removes t-butyl alcohol from the 3,5,5-trimethylhexanoic acid composition through a combination of distillation and water washing steps. The distillation separates the acid from higher boiling point impurities, while the water washing step specifically removes t-butyl alcohol by exploiting its water solubility, achieving both purity improvement and sulfuric acid coloring prevention
Solution Approach 2:
The patent changes the physical and chemical parameters of the purification process by controlling the pH during water washing and adjusting the distillation temperature profile. By maintaining specific pH conditions during washing, the solubility differences between t-butyl alcohol and the acid are maximized, enabling effective removal of the coloring impurity while preserving the acid
2Object-affected harmful factors
If multiple purification steps are added to remove t-butyl alcohol and improve sulfuric acid coloring, then the sulfuric acid coloring evaluation is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the distillation and water washing operations into an integrated purification sequence where the distillate is directly subjected to water washing without intermediate storage or handling. This combination achieves effective t-butyl alcohol removal while minimizing the number of separate equipment units and operational steps required
Solution Approach 2:
The patent uses water as an intermediary substance to remove t-butyl alcohol. Water acts as a selective solvent that dissolves t-butyl alcohol but not the 3,5,5-trimethylhexanoic acid, enabling clean separation through simple phase decantation without requiring complex extraction equipment or additional chemical reagents
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves sulfuric acid coloring evaluation by reducing t-butyl alcohol concentration, enhancing the sulfuric acid coloring performance of the 3,5,5-trimethylhexanoic acid composition.
Implementation Method 1
a distillation step of distilling the crude 3,5,5-trimethylhexanoic acid
Implementation Method 2
a water washing step of washing the 3,5,5-trimethylhexanoic acid obtained in the distillation step with water
Implementation Method 3
a bubbling step of bubbling the 3,5,5-trimethylhexanoic acid obtained in the water washing step with an inert gas
Data Source
AI summary
A 3,5,5-trimethylhexanoic acid composition containing 3,5,5-trimethylhexanoic acid and t-butyl alcohol in which the t-butyl alcohol concentration in terms of toluene-d8 measured by gas chromatography-olfactometry/mass spectrometry under the conditions below exceeds 0 ppb by volume and is 200 ppb by volume or less is provided. The composition is excellent in sulfuric acid coloring evaluation, (Measurement Conditions) · The 3,5,5-trimethylhexanoic acid composition is concentrated, and · The concentrated sample is measured by gas chromatography-olfactometry using a column using dimethylpolysiloxane as a stationary phase, and the structure of a measured component is analyzed with a mass spectrometry detector.