NOVELTY - An ethylene glycol rectification device comprises hydrogenation reaction product tank (6) connected by pipe to primary dealcoholization tower (1), secondary dealcoholization tower (2), and ethylene glycol refining tower (5) in which ethanol removing tower (3) and butylene glycol removing tower (4) is connected by pipe and is set on pipe connecting 2nd dealcoholization tower and ethylene glycol refining tower, top of ethanol removing tower is connected to ethanol tank, and top of butylene glycol removing tower is connected to butylene glycol tank.    USE - An ethylene glycol rectification device for production of ethylene glycol using synthetic natural gas (claimed).    ADVANTAGE - Ethylene glycol rectification device reduces production cost and steam consumption, saves energy, improves purity of methanol and ethanol, and ethylene glycol.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for rectification of ethylene glycol which involves generating ethylene glycol solution in hydrogenation reaction product tank, sending to primary dealcoholization tower, performing atmospheric rectification with 3-5 kg steam, sending 65-75 degrees C fraction from tower top to methanol tank (7), sending ethylene glycol mixture from tower bottom to secondary dealcoholization tower, rectifying under vacuum degree of - 0.04 MPa to - 0.05 MPa with 3-5 kg steam, sending 420-480 degrees C fraction from tower top to methanol tank, sending ethylene glycol mixture from tower bottom to ethanol removing tower, rectifying under vacuum degree of - 0.04 MPa to - 0.05 MPa with 3-5 kg steam, sending 72-78 degrees C fraction from tower top to ethanol tank (8), sending mixture from tower bottom to butylene glycol removing tower, rectifying under vacuum degree of - 0.04 MPa to - 0.05 MPa, sending 145-150 degrees C fraction from tower top to butylene glycol tank (9), sending ethylene glycol liquid from tower bottom to ethylene glycol refining tower, rectifying under vacuum degree of - 0.04 MPa to - 0.05 MPa, sending 132-133 degrees C ethylene glycol fraction from tower top to qualified product tank (10), sending part of ethylene glycol liquid from qualified product tank to butylene glycol removing tower, and sending 142-143 degrees C ethylene glycol fraction from bottom of tower to high-grade product tank (11).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram for ethylene glycol rectification device.    Primary dealcoholization tower (1)    Secondary dealcoholization tower (2)    Ethanol removing tower (3)    Butylene glycol removing tower (4)    Ethylene glycol refining tower (5)    Hydrogenation reaction product tank (6)    Methanol tank (7)    Ethanol tank (8)    Butylene glycol tank (9)    Qualified product tank (10)    High-grade product tank (11)