Patent ID: 9018421
Filing Date: 2015-04-28
Classification: B01D,C07C

Abstract:
1. A process for separating and recovering an aromatic aldehyde from a mixture comprising an aromatic aldehyde, light and heavy impurities and tar, comprising: obtaining said mixture comprising said aromatic aldehyde, said light and heavy impurities and tar by extraction using an organic solvent, carried out after introduction of a formyl group, and then separating said aromatic aldehyde from said organic solvent used in said extraction by carrying out a distillation, to obtain: at the distillation bottom, a liquid phase comprising said aromatic aldehyde accompanied by various light impurities, the tar and heavy impurities, at the distillation top, a gas phase comprising said organic solvent used in said extraction and said aromatic aldehyde at a low concentration enabling recycling of the organic solvent to said extraction; and introducing a liquid stream including said mixture obtained from said distillation bottom into an evaporator, said mixture being vaporized therein such that, on the one hand, a gas stream comprising the aromatic aldehyde, the light impurities, the heavy impurities that are vaporized at selected evaporation temperature and pressure, and, on the other hand, a liquid stream essentially comprising the tar are separated, and recovering the aromatic aldehyde from the separated gas stream, said aromatic aldehyde having the following formula (I): wherein in said formula (I): R is a hydrogen atom or an alkyl group, R n is a number ranging from 0 to 4.