The invention discloses a method for extracting methylnaphthalene in C10 aromatics. The concrete process comprises charging the
raw material C10 aromatics by employing a continuous intermediate charging manner, and starting to heat when the liquid level reaches the 1 / 3 position; controlling the
tower top D-1 temperature to be 203.5-206.1 DEG C, the side-
stream D-2 temperature to be 221.5-223.6 DEG C, the side-
stream D-3 temperature to be 244.7-246.5 DEG C, and the
tower kettle D-4 temperature to be 252.5-256.6 DEG C; after separation, obtaining light C10 compositions at the
tower top, obtaining a
durene and
naphthalene enriched solution at the side-
stream D-2, obtaining a methylnaphthalene enriched solution at the side-stream D-3, and obtaining heavy C10 compositions at the tower kettle D-4; and condensing and crystallizing the side-stream D-3 composition, so as to obtain methylnaphthalene. The method is short in period, simple in operation, low in
energy consumption and high in
relative yield. Under the conditions that the continuous side-stream rectifying tower temperature, the charging / discharging rate and the
reflux ratio are determinate, the methylnaphthalene content in the methylnaphthalene enriched solution can be improved to 88 wt% or more at one time, the yield reaches 86% or more, and after
continuous crystallization, the methylnaphthalene
crystal purity is 96% or more, and the yield is 86% or more.