公开(公告)号：WO2015157009A1

公开(公告)日：2015-10-15

申请号：PCT/US2015/022714

申请日：2015-03-26

Applicant: INVISTA NORTH AMERICA S.A.R.L.

Inventor： MCDONNELL, Finbar ,  GOHO, Ronojoy ,  WADROP, Kristan

IPC: C02F1/26 ,  C02F1/66 ,  C02F1/44 ,  C02F1/58

CPC classification number: C02F9/00 ,  C02F1/26 ,  C02F1/441 ,  C02F1/444 ,  C02F1/66 ,  C02F2101/20 ,  C02F2103/36

Abstract: Disclosed are methods for purifying aqueous waste streams from a pure terephthalic acid (PTA) manufacturing plant and recycling of the purified water back into the PTA plant. Specifically, provided is a process for treating an aqueous eluent stream generated by a pure plant mother liquor solvent extraction process by raising the pH of the aqueous stream with an alkali, filtering the adjusted stream; and contacting the filtered stream with a reverse osmosis unit to form a demineralized water stream. Raising the pH of the aqueous stream with an alkali converts the soluble metal salts to insoluble compounds, while also converting both soluble and insoluble organic acids to the corresponding acid salts. The filter can be a standard ultrafiltration membrane, which removes the insoluble metal compounds and other remaining insoluble components. The reverse osmosis unit removes organic acid salts, including sodium salts, while balancing the pH.

Abstract translation: 公开了从纯对苯二甲酸（PTA）制造工厂净化含水废水流并将净化水回收到PTA设备中的方法。 具体地，提供了通过用碱提高含水流的pH来处理由纯植物母液溶剂萃取过程产生的含水洗脱液流的过程，过滤调节的流; 并将过滤的流与反渗透单元接触以形成软化水流。 用碱提高含水流的pH可将可溶性金属盐转化为不溶性化合物，同时将可溶性和不溶性有机酸转化为相应的酸式盐。 过滤器可以是标准的超滤膜，其除去不溶性金属化合物和其它剩余的不溶性成分。 反渗透装置除去有机酸盐，包括钠盐，同时平衡pH值。

公开(公告)号：WO2015157082A1

公开(公告)日：2015-10-15

申请号：PCT/US2015/024093

申请日：2015-04-02

Applicant: INVISTA NORTH AMERICA S.A.R.L.

Inventor： MCDONNELL, Finbar ,  GOHO, Ronojoy

IPC: C07C51/02 ,  C07C51/347 ,  C07C65/32 ,  C07C65/34

CPC classification number: C07C51/47 ,  C07C63/26

Abstract: Disclose are methods for minimizing the recycle of para-toluic acid within a terephthalic acid purification plant. Specifically, the disclosed methods remove a portion of the p-toluic acid from the pure plant flash condensate and recycles a portion of this cleaned stream back to the crude TA feed stream before the pure plant process. This process allows the 4-CBA in the crude TA to be increased from below 3000 ppm to between 3000 ppm to 4000 ppm without increasing p-toluic acid in the PTA, resulting in an about 7% increase in the pure plant mother liquor flows.

Abstract translation: Disclose是用于最小化对苯二甲酸净化设备内对甲苯甲酸循环的方法。 具体地，所公开的方法从纯植物闪蒸冷凝物中除去一部分对甲苯甲酸，并将该清洁的流的一部分在纯植物过程之前再循环回粗TA进料流。 该方法允许粗制TA中的4-CBA从3000ppm提高到3000ppm至4000ppm，而不增加PTA中的对甲苯甲酸，导致纯植物母液流量增加约7％。