| 摘要 |
PURPOSE:To prepare the titled compound useful as a propellant of insecticides, etc., easily, in an odorless state, without producing organic sulfur compound giving characteristic odor, by dehydrating methanol in the presence of a catalyst comprising an alumina catalyst containing less than specific amount of sulfur. CONSTITUTION:Dimethyl ether is prepared by the dehydration reaction of methanol using an alumina catalyst having a total sulfur content of <=0.3wt%, preferably <=0.25wt%, and when the catalyst contains sulfur as oxides such as SO3, SO4, etc., having a sulfur oxide content of <=0.1wt%, preferably <=0.05wt%. Methanol is made to contact with the catalyst at preferably 270-400 deg.C, 2- 20kg/cm<2>G pressure, and a space velocity of 1,000-4,000hr<-1>. The catalyst is preferably prepared by adding an alkali to aluminum sulfate, treating the resultant hydrogel with 1.5-4% ammonia water, and granulating the product. |
