The production process of the PTA (purified terephthalic acid) refining unit requires the use of a large amount of deionized water as a solvent. Most of the deionized water leaves the main process in the form of mother liquor. This refined sewage has a large flow rate and a high chemical oxygen demand (COD). , High solid content and difficult to handle. Since the mother liquor contains reaction by-products, it is necessary to set up a mother solid recovery unit, and the organic matter in the mother liquor is recovered by the filter separation effect of the filter to reduce resource consumption.

SP Solution:

Mother liquor recovery and filtration: The filter element developed by SP is used to recover TA (terephthalic acid) and other organics in the mother liquor, which can not only reduce the unit consumption of PX (para-xylene) in the system, but also reduce the COD content in the wastewater.

Filtration of production wastewater: The COD concentration of PTA wastewater is high, and some of the acidic substances are substances containing benzene rings. The temperature of wastewater is high, and the pH changes greatly. Membrane separation technology is commonly used in wastewater treatment. Installing a filter before the reverse osmosis membrane separation device can effectively prevent damage to the filter membrane, while also improving the filtration efficiency and protecting downstream equipment.

Product purification and filtration: In the PTA production process, the solid-liquid separation is very important. The solid-liquid separation in the oxidation section is to remove the acetic acid solution in the TA slurry to ensure the production requirements of the hydrorefining stage; in the refining stage The purpose of solid-liquid separation is to remove PT acid and obtain high-purity terephthalic acid by filtration.

SP Advantages:

ØHigh permeability and excellent permeability, small pressure loss, large flow.

ØHigh filtration precision, high strength, and strong anti-erosion ability.

ØExcellent acid and alkali resistance, corrosion resistance, and long replacement cycle.

ØIt can be cleaned, regenerated and reused.