| 摘要 |
<p>A process for production of high-purity bis-β-hydroxyethyl terephthalate, which comprises the step (1) of esterifying crude terephthalic acid with ethylene glycol and/or ethylene oxide to obtain a reaction product containing bis-β-hydroxyethyl terephthalate, the step (2) of converting the reaction product formed in the step (1) into a solution of bis-β-hydroxyethyl terephthalate (solute) in ethylene glycol (solvent), if necessary, with additional ethylene glycol, and then removing ions from the solution to form a deionized solution, the step (3) of distilling the deionized solution formed in the step (2) to recover crude bis-β-hydroxyethyl terephthalate with low-boiling matter distilled away, and the step (4) of subjecting the crude bis-β-hydroxyethyl terephthalate obtained in the step (3) to molecular distillation to recover bis-β-hydroxyethyl terephthalate as distillate.</p> |
