| 摘要 |
Ethers are separated from the high-boiling residues remaining after distilling off the desired alcohol(s) from a product of the carbonylation of olefines by submitting the high-boiling residues to azeotropic distillation with a glycol whereby the ethers distil over with the glycol. In an example, the residue obtained by distilling crude iso-octanol from the product of the carbonylation of heptenes is distilled, using a boiler and a fractionating column, in order to completely remove iso-octanol. The still-head temperature at this stage is 225 DEG C. Propylene glycol is then added to the boiler, and the distillation is continued. The ether/propylene glycol distillate is cooled, and allowed to separate, in a decanter, into a ether-rich layer and a glycol rich layer. The latter is returned directly to the boiler. The ether layer is washed with water and separated; the ethers so obtained boiled within the range 236-281 DEG C. The residual liquid remaining in the boiler is distilled to remove propylene glycol and recover a product consisting mainly of higher alcohols which can be satisfactorily oxidized to acids by means of fused caustic soda. |
