Method for preparing resorcinol through micro-channel reaction

A method for preparing resorcinol through micro-channel reaction, comprising the following steps:

• (1) preparation of a diazo salt:
• mixing m-aminophenol with sulfuric acid aqueous solution to obtain a first mixture, then conveying the first mixture to a first reaction module in a micro-reactor to be pre-cooled to 5˜15° C.;
• conveying sodium nitrite aqueous solution to a second reaction module in the micro-reactor to be pre-cooled to 5˜15° C.;
• conveying the pre-cooled materials obtained in the first reaction module and the second reaction module to a third reaction module in the micro-reactor to be mixed and reacted, wherein the temperature of the third reaction module is 5˜30° C., then conveying the above obtained mixture to a fourth reaction module in the micro-reactor to react to obtain a m-aminophenol diazo salt, wherein the temperature of the fourth reaction module is 5˜30° C.;
• (2) hydrolysis of the diazo salt:
• respectively conveying an organic solvent and water to a fifth reaction module in the micro-reactor to be preheated to 60˜90° C., then conveying the above preheated material to a sixth reaction module in the micro-reactor, and meanwhile conveying the m-aminophenol diazo salt obtained in step (1) to the sixth reaction module to be mixed to obtain a hydrolysis reactant, wherein the temperature of the sixth reaction module is 60˜90° C., conveying the hydrolysis reactant to a seventh reaction module for further hydrolysis reaction, wherein the temperature of the hydrolysis reaction is 60˜90° C., finally conveying the above obtained hydrolysis reactant to a cooling module to be cooled, and collecting a product to obtain the resorcinol.