Research Institute of Industrial Science & Technology

Korea Research Institute of Chemical Technology

Jae Cheon Koh

Chul Ung Kim

Yun Min Kim

Jung Min Lee

Sang Jin Moon

Kwang Joo Kim

Dong Jun Koh

Hang Kyo Jin

Kyong Tae Kim

Won Uook So

Joon Hyun Baik

Young Sam Sa

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.

Method for preparing dialkyl carbonate

Disclosed is a method for preparing a dialkyl carbonate, in which a dialkyl carbonate such as dimethyl carbonate is economically prepared in an environmentally-friendly manner at a higher yield while reducing generation of a by-product. The method for preparing the dialkyl carbonate includes reacting urea, an alkyl carbamate having 1 to 3 carbon atoms, or a mixture thereof with a monovalent alcohol having 1 to 3 carbon atoms in the presence of a room temperature ionic liquid and a catalyst including a salt of a transition metal or a rare earth metal.

Method for concentrating aqueous tetrafluoroethylene emulsion by

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Pohang-si, South Korea

Jae Cheon Koh