Method for preparing 2-ethylhexyl acrylate by catalysis of acidic caprolactam ionic liquid
The technology of isooctyl acrylate and acid ionic liquid is applied in the field of catalyzing and synthesizing isooctyl acrylate by acid ionic liquid, can solve the problems of complicated preparation process, high price, difficult recovery and use of catalyst, and achieves simple reaction operation and improved product recovery. efficiency, simple separation of catalyst and product
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Embodiment 2~4
[0019] Examples 2~4: Preparation of Caprolactam Acidic Ionic Liquid
[0020] Different acids (shown in Table 1) were used to replace the concentrated sulfuric acid described in Example 1. Other conditions and operations were the same as in Example 1.
[0021] Table 1 Preparation of Caprolactam Acidic Ionic Liquids with Different Anions
[0022] Example acid Yield (%) Example 2 Phosphoric acid (95wt%) 89.5% Example 3 Methanesulfonic acid (99wt%) 96.5% Example 4 P-toluenesulfonic acid (99wt%) 88.2%
Embodiment 5
[0024] In a three-necked flask equipped with an electromagnetic stirrer, thermometer, water trap and condenser, 3.6 g (0.05 mol) of acrylic acid, 0.36 g of the catalyst prepared in Example 1 (10% of the mass of acrylic acid), 20 mL of cyclohexane Alkane, 0.2g benzothiophene and 7.8g (0.06mol) isooctyl alcohol. The reaction temperature is 110°C, and the reaction time is 3 hours. After the reaction, the reaction solution was cooled to room temperature, cyclohexane was separated and the catalyst was recovered. Cyclohexane is recovered to obtain isooctyl acrylate. The product content is 95.1%, and the yield is 97.5%.
Embodiment 6
[0026] In a three-necked flask equipped with an electromagnetic stirrer, a thermometer, a water trap and a condenser, 3.6 g (0.05 mol) of acrylic acid, 0.175 g of the catalyst prepared in Example 3 (5% of the mass of acrylic acid), 20 mL of cyclohexane Alkane, 0.2g benzothiophene and 7.8g (0.06mol) isooctyl alcohol. The reaction temperature is 100°C, and the reaction time is 2 hours. After the reaction, the reaction solution was cooled to room temperature, cyclohexane was separated and the catalyst was recovered. Cyclohexane is recovered to obtain isooctyl acrylate. The product content is 96.1%, and the yield is 98.5%.
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