Hexamethylenediamine production system

A hexamethylenediamine production system comprises at least two hydrogenation reactors, a gas-liquid separator and a gas-liquid separator, wherein the hydrogenation reactors are gas-liquid-solid three-phase fixed bed reactors, a heat exchange interlayer is arranged on the side wall of each hydrogenation reactor, and a heat exchange coil is arranged in each hydrogenation reactor; wherein the top ofeach hydrogenation reactor is connected with an adiponitrile source through a first feeding pipe, a first valve is arranged on each first feeding pipe, the bottom of each hydrogenation reactor is connected with a hydrogen source through a second feeding pipe, and a second valve is arranged on each second feeding pipe; the side wall of the hydrogenation reactor located at the high position is connected with a liquid-phase material source through a third feeding pipe and connected with the side wall of the hydrogenation reactor located at the low position through an overflow pipe, and the gas-liquid separator is arrang