The continuous preparation of dibutyl terephthalate(DBT)is realized by using a two-stage tubular reactor coupled with a permeation separation unit,using terephthalic acid(PTA)and n-butanol as raw materials,not using a catalyst under high temperature and high pressure conditions.The influences of reaction temperature,pressure,residence time and alkyd-acid ratio on the yield of the final secondary esterification product are investigated.Results show that the first-order esterification conversion rate of PTA reaches 90.06％,and the yield of DBT reaches 66.14％when reaction temperature is 360℃,reaction pressure is 16 MPa,reaction residence time is 25 min,and alkyd-acid ratio is 30︰1.The conversion rate of secondary esterification raw materials reaches 99.03％,and the yield of DBT reaches 84.18％.
维普
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