Method for preparing polyetherketoneketone and polyetherketoneketone prepared thereby

A method for preparing a polyetherketoneketone (PEKK), which obtains a high-molecular-weight PEKK with high yield, the method comprising:

• (a) producing a reaction solution in a reactor by introducing into a liquid reaction medium in the reactor (i) at least one selected from diphenyl oxide (DPO) or 1,4-bis(4-phenoxybenzoyl)benzene (EKKE), (ii) terephthaloyl chloride (TPC), and (iii) isophthaloyl chloride (IPC) and dissolving simultaneously the (i) at least one selected from diphenyl oxide (DPO) and 1,4-bis(4-phenoxybenzoyl)benzene (EKKE), the (ii) terephthaloyl chloride (TPC), and the (iii) isophthaloyl chloride (IPC) in the liquid reaction medium;
• (b) lowering a temperature of the reaction solution and adding a catalyst to the reaction solution;
• and
• (c) directly blowing inert gas into the reaction solution after the catalyst is added and stirring the reaction solution to remove hydrochloric acid (HCl),
• wherein the direct blowing of inert gas in step (c) is carried out through a nozzle provided in the reactor such that the inert gas is injected into the reaction solution in a plurality of directions,
• wherein the stirring in step (c) comprises dispersing the added inert gas by rotating a stirrer having a plurality of stirring blades, and wherein the stirrer is provided with two or more stirrers in the reactor such that the two or more stirrers rotate in at least two directions to generate a vortex.