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CN110372116A 一种回收PTA氧化装置废水中醋酸的方法 无效 - 驳回

一种回收PTA氧化装置废水中醋酸的方法
摘要：
本发明公开了一种回收PTA氧化装置废水中醋酸的方法，依次按以下步骤进行：(1)将PTA氧化装置废水通入装有吸附剂的吸附罐内进行吸附处理，产生吸附出水；(2)对吸附出水进行预处理；(3)将经预处理的吸附出水通入至少一级反渗透单元中，收集反渗透浓缩液送至用户点，而生成的反渗透渗透液则返回之前的工艺中回用。本发明提供的一种回收PTA氧化装置废水中醋酸的方法，通过吸附其中以对甲基苯甲酸、对苯二甲酸、苯甲酸为代表性的有机酸，使吸附出水中有机酸含量大幅降低，从而避免出现在反渗透单元中随着浓缩的进行，对甲基苯甲酸、对苯二甲酸、苯甲酸等有机酸的浓度不断提高并逐步结晶析出，进而导致反渗透膜元件污堵的情况。
摘要（英）：

The invention discloses a method for recovering acetic acid in waste water of a pure terephthalic acid (PTA) oxidation device. The method for recovering acetic acid in the waste water of the PTA oxidation device sequentially comprises the following steps that (1) the waste water of the PTA oxidation device is introduced into an adsorption tank containing an adsorbent for adsorption treatment to produce adsorbed water; (2) the adsorbed water is pre-treated; (3) the pre-treated adsorbed water is introduced into at least one-stage reverse osmosis unit, a reverse osmosis concentrate is collected and fed to a user point, and the generated reverse osmosis concentrate is returned to the previous process for reuse. According to the method for recovering acetic acid in the waste water of the PTA oxidation device, by adsorbing organic acid represented by p-methylbenzoic acid, terephthalic acid and benzoic acid, the organic acid content in the adsorbed water is greatly reduced, the situation thatfouling of a reverse osmosis membrane element is caused due o the fact that in the reverse osmosis unit, as the concentration progresses, the concentration of the organic acid such p-methylbenzoic acid, the terephthalic acid and the benzoic acid is continuously increased and gradually subjected to separation by crystallization is avoided.

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