| 摘要 |
The present invention provides a method for preparing dialkyl carbonate from urea or alkyl carbamate and alkyl alcohol using an ionic liquid comprising a cation, which produces a hydrogen ion, and a hydrophobic anion containing fluorine with high temperature stability in the presence of catalyst containing a metal oxide or hydrotalcite. Since the present invention can prepare dialkyl carbonate at a pressure lower than those of existing methods, it does not require an expensive pressure control device and peripheral devices for maintaining high pressure including the installation cost. It is also the method for preparing a dialkyl carbonate with high yield, thus improving economical efficiency. Moreover, the method of the present invention hardly produces any waste during the process and is thus an eco-friendly method. |
| 主权项 |
1. A method for preparing dialkyl carbonate by reacting alkyl alcohol with urea or alkyl carbamate in the presence of: an ionic liquid comprising a cation capable of generating a hydrogen ion (H+), and a hydrophobic anion containing fluorine, and a catalyst,
wherein said cation is a quaternary ammonium cation, an imidazolium cation, a pyridium cation, a pyrazolium cation, a pyrrolinium cation, a quaternary phosphonium cation, a thiazolium cation, or a sulfonium cation, and said hydrophobic anion is bis(trifluoromethylsulfonyl)imide, trifluoromethanesulfonate, or tris(trifluoromethylsulfonyl)methanide. |
