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.
本发明提供了一种从
尿素或烷基
碳酸酯和烷基醇制备二烷基
碳酸酯的方法,使用包含产生氢离子的阳离子和含有高温稳定性的含
氟疏
水性阴离子的
离子液体,在催化剂的存在下,催化剂包含金属氧化物或
水滑石。由于本发明可以在比现有方法更低的压力下制备二烷基
碳酸酯,因此不需要昂贵的压力控制装置和维持高压力的外围设备,包括安装成本。这也是一种高产率制备二烷基
碳酸酯的方法,从而提高了经济效益。此外,本发明的方法在过程中几乎不产生任何废物,因此是一种环保的方法。