对苯二甲酸双羟丁酯合成过程中副产物四氢呋喃生成动力学的研究

对在工业生产条件下，以０．０５％（质量比）Ｔｉ（Ｏ－ｎ－Ｃ＿４Ｈ＿９Ｏ）＿４为催化剂，将对来二甲酸与１，４－丁二醇直接酯化，ＢＤ／ＴＰＡ＝１．７０（ｍｏｌ比），生成四氢呋喃（ＴＨＦ）的副反应动力学进行了研究，得出了ＴＨＦ生成的动力学方程ｄＦ／ｄｔ＝Ｋ（Ｍ＿Ｒ－Ｘ－Ｆ），反应速率常数ｋ＝１．７８×１０￣（１２）ｅｘｐ（－３２９００／ＲＴ）和ＴＨＦ生成的活化能Ｅ．＝１３７．５ｋＪ／ｍｏｌ，略高于酯化反应的活化能，表明以控制反应温度的方法抑制ＴＨＦ的生成是困难的。

A KINETIC REsEARCH ON FORMATION OF THE TETRAHYDROFURAN IN THE SYNTHESIS OF BUTYLENE TEREPHTHALATE

The kinetics of formation of tetrahydrofuran(THF)in direct esterification reaction of terephthalic acidwith 1,4-butandiol (BD/TPA=1. 70) under industrial condition with Ti(O-n-butyl)_4(0.05 wt%)as catalysthas been studied,Based on the studies,a kinetic equation has been established (dF/dt= k(M_R-X-F )),Thereaction rate constant k(k = 1.87 × 10￣(12)exp(-32900RT ))and THF forming activation energy E(E_a= 137.5kJ/mol)are obtained. The results show that it is difficult to restrain formation of THF by control esterifica-tion reaction temperature becaues the forming activation energy of THF is only slightly higher than that of es-terification reaction.