| 摘要 |
<p>The present invention (first embodiment) relates to a process for the dehydration of at least an alcohol to make at least an olefin, comprising : a) introducing in a reactor a stream (A) comprising at least an alcohol optionally in aqueous solution and an inert component, b) contacting said stream with a catalyst in said reactor at conditions effective to dehydrate at least a portion of the alcohol to make an olefin, c) recovering from said reactor a stream (B) comprising : the inert component and at least an olefin, water and optionally unconverted alcohol, d) optionally fractionating the stream (B) to recover the unconverted alcohol and recycling said unconverted alcohol to the reactor of step a), e) optionally fractionating the stream (B) to recover the inert component and the olefin and recycling said inert component to the reactor of step a), Wherein, the inert component is selected among ethane, the hydrocarbons having from 3 to 10 carbon atoms, naphtenes and CO2, the proportion of the inert component is such as the reactor operates essentially adiabatically. The present invention also relates to a similar process as above but the catalyst is : ⢠a crystalline silicate having a ratio Si/AI of at least 100, or ⢠a dealuminated crystalline silicate, or ⢠a phosphorus modified zeolite, the WHSV of the alcohol is at least 2 h-1 when the catalyst is a crystalline silicate having a ratio Si/AI of at least 100 or a dealuminated crystalline silicate. Advantageously the pressure of the dehydration reactor is high enough to help the recovery of the inert component and recycling thereof in the reactor of step a) without a gas compressor but only a pump.</p> |
