The invention discloses an
ethylene glycol refining and separating method and
system, solving the problems of complex process, difficult separation and high equipment investment and
energy consumption existing in the prior art. Reaction
mixed gas from an
ethylene glycol synthetic
system is cooled and then is separated by a first gas-liquid separator, the
gas phase is fed into the
ethylene glycol synthetic
system as
hydrogen-containing circulating gas, and the
liquid phase is fed into a
methanol recovering
tower to product
methanol from the top of the
tower; the reaction
mixed gas is fed into the second gas-liquid separator after cooling, the
gas phase is cooled further and then is fed into the first gas-liquid separator, the
liquid phase is mixed with a
tower bottom liquid from the
methanol recovering tower and then is fed into a
degreasing tower, mixed
ethanol ester is produced from the top of the
degreasing tower, the tower bottom liquid is fed into a
hydrogen removing tower, light
alcohol is produced from the top of the
hydrogen removing tower, the tower bottom liquid is fed into a refining tower, and qualified
ethylene glycol is produced from the top of the refining tower, a side-draw is arranged at the same time to extract high-quality
ethylene glycol. The process is simple, the operation is simple and convenient, the equipment investment and running cost are low, the
impurity separation effect is favorable, and the yield is high.