1. Reaction Raw Materials and Ratios

• Reactants: Methyl ethyl ketoxime, methyltrichlorosilane (MCl₃), solvent (e.g., n-hexane or #120 gasoline)

• Molar ratio: Methyl ethyl ketoxime to methyltrichlorosilane is typically 6:12

2. Reaction Conditions

• Temperature: 55–65 °C under atmospheric pressure (some processes as low as 30–40 °C)

• Reaction time: 1–2 hours (in some processes shortened to 30 minutes)

3. Reaction Mechanism

• Reaction type: Substitution reaction — methyl ethyl ketoxime reacts with methyltrichlorosilane in solvent to form methyltris(methyl ethyl ketoxime) silane

• Catalyst: In some processes, p-toluenesulfonic acid is used as a catalyst

4. Separation and Purification

• Phase separation: After reaction, the mixture is allowed to stand.

  • Upper phase: Crude methyltris(methyl ethyl ketoxime) silane

  • Lower phase: Precipitate of methyl ethyl ketoxime hydrochloride salt

• Neutralization: The crude product is neutralized with ammonia gas, converting the hydrochloride salt into ammonium chloride solid

• Solvent recovery: The neutralized liquid is distilled twice (atmospheric or reduced pressure) to recover solvent and purify the final product

5. Process Optimization

• Solvent selection: High-boiling-point solvents (e.g., #120 gasoline) improve separation efficiency

• Continuous process: Some studies have developed continuous reaction systems to enable material recycling and higher efficiency

6. Application Fields

• Mainly used as a curing agent for silicone sealants and an anti-skinning agent for alkyd resin coatings