| For the demineralization of water in the production of ultra pure water (> 18MOhm*cm at 25°C) Lewatit® UltraPure 1299 MD is a ready-to-use mixed bed comprising a gel type strongly acidic cations exchange resin (SAC, Lewatit UltraPure 1219 MD) and a gel type, strongly basic anion exchange resin (SBA, type I, Lewatit UltraPure 1243 MD), individually with a monodispersed bead size distribution (uniform particles) based on a styrene-divinylbenzene copolymer for the use in working/regenerable and polishing/non-regenerable systems for the production of ultra pure water. The monodisperse beads (uniformity coefficient: max 1.1) are chemically and osmotically highly stable. The optimized kinetics lead to an increased operating capacity and the very low content of fines also results in a low pressure drop compared to ion exchange resins with heterodisperse bead size distribution. Lewatit UltraPure 1299 MD is correspondingly adjusted to the total capacity of the individual components to an equivalent ration of 1:1. The smaller bead size of the SAC contributes to better mixing properties. Lewatit UltraPure 1299 MD is highly regenerated and specially cleaned for meeting the specifications of the semiconductor industry. Leaching of organics from Lewatit UltraPure 1299 MD into the treated water is reduced to a level less than 1.0 ppb, and its resistivity achieves a level higher than 18 MOhm*cm.Information provided by Lanxess. |
