• New anion exchange resin Lewatit MonoPlus TP 109;
• Unveiling at Aquatech, November 6-9, 2023, stand 01.314;
• High selectivity for contaminating anions;
• Sustainable process thanks to efficient regeneration.
With the new macroporous anion exchange resin Lewatit MonoPlus TP 109, the specialty chemicals company LANXESS is expanding its range of selective resins for the efficient removal of contaminants such as per- and polyfluoroalkyl substances (PFAS) from water. The resin will be presented for the first time at the international trade show Aquatech, which will take place in Amsterdam, the Netherlands, from November 6 to 9, 2023.
“Ion exchange resins have proved themselves over many years and all over the world as a reliable and efficient means of removing contaminants from water. Ion exchange and adsorption processes sometimes even have a cooperative effect,” says Dr. Dirk Steinhilber, Technical Marketing Manager in the Liquid Purification Technologies business unit at LANXESS. “Lewatit MonoPlus TP 109 is especially suitable for the purification and remediation of water with PFAS concentrations exceeding 10 ppb. As an integral part of our range of resins, it helps us to develop custom solutions for removing PFAS.” In addition to its high selectivity, the macroporous resin exhibits good kinetics and high fouling resistance. Furthermore, the uniform bead size ensures improved hydraulics. It can be efficiently regenerated with tried-and-tested regeneration chemicals such as methanol and sodium chloride. “Especially with higher PFAS concentrations in water, this is a crucial benefit not least because it allows the resin to be used sustainably,” says Steinhilber.
Lewatit MonoPlus TP 109 efficiently binds not only different PFAS but also complex anions such as nitrate, bromate, chlorate and perchlorate so that they can then be reliably removed from water. It can even remove chlorate from concentrated sodium hydroxide.
Working together against PFAS contamination
In addition to the newly presented Lewatit MonoPlus TP 109, LANXESS offers a range of other selective resins for removing PFAS and that can also be combined for pre-cleaning and final polishing.
The heterodisperse, gel-type, strong base anion exchange resin Lewatit TP 108 DW helps to remove PFAS especially short-chain members of this substance class even in concentration ranges of less than 10 ppb and, thanks to its extremely high selectivity, into the ppt range. At a fire service training site in Australia, for example, up to 200 ppb of PFAS were removed from more than 50 million liters of groundwater over the course of many months. Due to the high usable capacity and correspondingly long service lives even in the presence of chlorides and sulfates, regeneration is not recommended for this resin. Lewatit TP 108 DW is certified to Standard 61 of the NSF/ANSI/CAN and so meets US requirements for contact with drinking water a key quality criterion in many countries.
As a weak base, macroporous anion exchange resin, another selective resin Lewatit MP 62 WS offers medium selectivity for PFAS. Thanks to its high total capacity of more than 1.7 eq/L and also its high operating capacity, it is ideal for pre-treating heavily contaminated leachate, such as can be found close to the source of contamination. This resin, too, can be efficiently regenerated, in this case with sodium hydroxide.
Finally, Lewatit K 6362 (lewatit.com) is a strong base anion exchange resin that can be used for final polishing in a two-stage process, with Lewatit MonoPlus TP 109 or Lewatit MP 62 WS being used in the first purification stage.
At noon on November 8, 2023, Steinhilber will be taking to the AquaStage at Aquatech to give a presentation entitled “The Use of Selective Lewatit Ion Exchange Resins for the Removal of Emerging Contaminants: PFAS and Beyond”, in which he will talk about the characteristics and potential applications of the selective resins from LANXESS for removing contaminants from water.
LANXESS (lanxess.com) is a leading specialty chemicals company with sales of EUR 6.8 billion in 2019. The company currently has about 14,400 employees in 33 countries. The core business of LANXESS is the development, manufacturing and marketing of chemical intermediates, additives, specialty chemicals and plastics. LANXESS is listed in the leading sustainability indices Dow Jones Sustainability Index (DJSI World and Europe) and FTSE4Good.
This company release contains certain forward-looking statements, including assumptions, opinions, expectations and views of the company or cited from third party sources. Various known and unknown risks, uncertainties and other factors could cause the actual results, financial position, development or performance of LANXESS AG to differ materially from the estimations expressed or implied herein. LANXESS AG does not guarantee that the assumptions underlying such forward-looking statements are free from errors, nor does it accept any responsibility for the future accuracy of the opinions expressed in this presentation or the actual occurrence of the forecast developments. No representation or warranty (expressed or implied) is made as to, and no reliance should be placed on, any information, estimates, targets and opinions contained herein, and no liability whatsoever is accepted as to any errors, omissions or misstatements contained herein, and accordingly, no representative of LANXESS AG or any of its affiliated companies or any of such person's officers, directors or employees accepts any liability whatsoever arising directly or indirectly from the use of this document.