Polyester fiber dyeing modifier isophthalic acid synthesis method, comprises the following steps: 2 mol 2,4-diethylphenol and 4-5 mol 2,3-butanediol were added to the reaction vessel, raised the temperature of the solution to 50 to 60 V, added 2-3mol boron trifluoride piperidine 5-8 times, controlled the addition time in 130-180 min, increased the solution temperature to 65-70°C, kept for 130-150 min, and then reduced the solution temperature to 40-45 °C, added 2L trifluoroacetone solution, controlled the stirring speed at 110-130 rpm, stirred for 30-40 min, reduced the solution temperature to 5-9 V, precipitated the solid, filtered, solid was washed with p-methoxyphenol solution for 4-6 times, washed with p-methoxy benzoic acid solution for 3-5 times, combined filtrate and washing solution, adjusted the pH to 4-5with oxalic acid solution, precipitated the crystals, recrystallizated in ethylene glycol solution, dehydrated with dehydration, finally got the product isophthalic acid.
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