초록 ▼

The invention relates to a process for preparing tertiary alkyl ethers. According to the process the feedstock containing hydrocarbons is fed to a catalytic distillation reactor system, in which the isoolefines, in particular the C4 to C7 isoolefines, of the feed are reacted with an alkanol in the p

The invention relates to a process for preparing tertiary alkyl ethers. According to the process the feedstock containing hydrocarbons is fed to a catalytic distillation reactor system, in which the isoolefines, in particular the C4 to C7 isoolefines, of the feed are reacted with an alkanol in the presence of a cation exchange resin in order to produce tertiary alkyl ether products. The reaction product containing the ethers is removed from the distillation system as the bottoms product and, if necessary, it is subjected to an additional treatment for producing a gasoline component. The unreacted alkanol is removed as the overhead product of the distillation. According to the invention, the distillate withdrawn mainly contains an azeotrope of C4 hydrocarbons and alkanol, the C4 amount of which at least approximately corresponds to the C4 hydrocarbon concentration of the hydrocarbon feed, a substantial amount of the unreacted alkanol being removed in the form of said azeotrope. By means of the invention the need for a separate alkanol washing unit is eliminated in the apparatus which considerably reduces apparatus investment costs.

대표청구항 ▼

Process for preparing an ether product used as a component of motor fuels, said process comprising the steps of feeding a feedstock containing C4-7 hydrocarbons, to a catalytic distillation reactor system, reacting the C5-7 isoolefins of the feedstock with an alkanol in the presence of a catalyst to

Process for preparing an ether product used as a component of motor fuels, said process comprising the steps of feeding a feedstock containing C4-7 hydrocarbons, to a catalytic distillation reactor system, reacting the C5-7 isoolefins of the feedstock with an alkanol in the presence of a catalyst to form tertiary alkyl ethers, removing the alkyl ethers from the distillation reactor system and substantially all of the unreacted hydrocarbons with the bottoms product of the distillation, and withdrawing an overhead product, which mainly contains an azeotrope of C4 hydrocarbons and the alkanol, the C4 amount of the withdrawn overhead product corresponding at least essentially to the amount of C4 hydrocarbons in the feedstock, whereby an essential part of the unreacted alkanol is removed in the form of said azeotrope.