Production of polyester

The present invention provides a method for the production of purified terephthalic acid crystals in an integrated terephthalic acid-polyester plant comprising the steps of: i) providing a stream of purified terephthalic acid crystals in an aqueous medium; ii) separating the purified terephthalic acid crystals from the aqueous medium in a filtration zone; and iii) washing the purified terephthalic acid crystals with an aqueous wash liquid, characterised in that at least a portion of the aqueous wash liquid is derived from an aqueous condensate liquor from the polyester plant. 本发明提供了种用于在集成式对苯二甲酸-聚酯装置中制备纯化的对苯二甲酸晶体的方法，所述方法包括以下步骤：i)提供含水介质中的纯化的对苯二甲酸晶体的流；ii)将所述纯化的对苯二甲酸晶体在过滤区中从所述含水介质分离；以及iii)使用含水洗涤液洗涤所述纯化的对苯二甲酸晶体，其特征在于，所述含水洗涤液的至少部分源于来自所述聚酯装置的含水冷凝液。