Device for continuously preparing 2,6-dihydroxybenzaldehyde

A device for continuously preparing 2,6-dihydroxybenzaldehyde, wherein the device comprises a first continuous reaction units, a second continuous reaction unit, and a third continuous reaction unit connected in series, the first continuous reaction units is used for hydroxy protection reaction, the second continuous reaction unit is used for lithiation and hydroformylation, and the third continuous reaction unit is used for deprotection reaction, wherein the third continuous reaction unit comprises:

• a first columnar continuous reactor (32), connected to the second continuous reaction unit (20) and used for deprotection of the lithiated hydroformylated product while performing liquid separation to obtain an organic phase containing 2,6-dihydroxybenzaldehyde and an aqueous phase;
• a deprotection agent supply device, the first columnar continuous reactor sets up a deprotection agent inlet and a lithiated hydroformylated product inlet, the deprotection agent supply device is connected to the deprotection agent inlet, the lithiated hydroformylated product inlet is connected to the second continuous reaction unit.