Preparation Method
First, a concentrated sulfuric acid catalyst is added to an autoclave. After sealing the vessel, the air inside is purged three times using carbon monoxide (CO). The reaction system is then heated, stirring is initiated, and CO is introduced into the system to a pressure of 2–9.5 MPa. The pressure is maintained constant throughout the reaction process while isobutene is added dropwise into the system at a specific rate. After the addition is complete, stirring is continued for a specific period; the pressure is then released, and the product is discharged to yield a crude synthesis liquid. Under stirring conditions, the crude synthesis liquid is slowly poured into ice water. After the addition is finished, stirring continues for another 7 minutes, followed by standing to allow for phase separation. The upper organic phase consists of crude trimethylacetic acid, which is then subjected to GC analysis. Subsequently, vacuum distillation is performed to collect the trimethylacetic acid fraction; the lower layer consists of the sulfuric acid phase. The dilute sulfuric acid is extracted using an organic solvent, concentrated, and recycled for reuse. Finally, trimethylacetic acid is reacted with potassium hydroxide in a 1:1 molar ratio, followed by recrystallization, to obtain potassium pivalate.
Storage
As an organic compound, potassium pivalate requires special care during storage to ensure its safety and stability. It should be kept in a tightly sealed container, avoiding exposure to moisture, high temperatures, or direct sunlight, as these conditions may adversely affect its chemical properties and quality. It should be stored in a cool, dry, and well-ventilated environment to minimize the risk of moisture absorption or decomposition. Furthermore, due to its somewhat corrosive nature-which may cause damage to metal materials-appropriate containers should be used for storage, such as wooden barrels lined with plastic bags or other packaging materials that do not react with the substance.
