| abstract |
The present invention is about a kind of preparation method of isoprene, by isopropylcarbinol or its aqueous solution, with formaldehyde or or the source material of formaldehyde, at an acidic catalyst aqueous solution in higher temperature, pressure reacts down and gets, can use one or several contact phase, the separating reaction stage in last contact phase comprises a heating zone, one reactor and a disengaging zone, wherein the pressure of this reactor is kept and is higher than under temperature of reactor, water saturation steam, and the pressure of this disengaging zone keeps and is lower than this saturated vapor pressure, and the reactant flow momentum that this reactor enters this disengaging zone can be controlled.When reactant and water generates, be to take out in separator in the mode of steam, the steam of taking-up is again through cooling, condensation with separate, and the fluid liquid of aqueous catalyst solution returns the heating zone again via extracting and separating after taking out. |