Method for producing ultrapure water
AssigneeMerck Patent GmbH
InventorsIchiro Kano, Gabriela Dima, Julien Gross, Yann Ratieuville
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Abstract
The present invention relates to a method for producing purified water comprising a step (a) of passing water through a mixed bed ion exchanger comprising beads having a diameter between 0.2 and 0.7 mm and a step (b) of passing water through a fibrous ion-exchange material. The invention further relates to a module comprising the mixed bed ion exchange resin and the fibrous material and to a water treatment system for producing ultrapure water comprising the mixed bed ion exchange resin and the fibrous material.
Claims17
A method comprising a step (a) of passing water through a mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a step (b) of passing said water through a fibrous ion-exchange material,
- wherein said mixed bed ion exchanger comprises a mixture of anion exchange particles in the form of said beads and cation exchange particles in the form of said beads,
- said anion exchange particles and said cation exchange particles are monodisperse, respectively, and
- wherein said fibrous ion-exchange material is a non-woven fibrous ion-exchange material and is arranged in layers, each said layer having a thickness of 1 mm up to 5 mm, said layers comprise either cation or anion exchange groups, and said layers comprising said cation-exchange groups and said layers comprising said anion-exchange groups being arranged in blocks, wherein said blocks are arranged as follows:
- 7×(C+2A)+C, 9×(C+2A)+C, 9×(C+3A)+C or 13×(C+2A)+C, wherein C is a layer of the cation-exchange groups and 2A is two consecutive layers of the anion-exchange groups, and 3A is three consecutive layers of the anion-exchange groups.
A module comprising a mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a fibrous ion-exchange material,
- wherein said mixed bed ion exchanger consists of a mixture of anion exchange particles in the form of said beads and cation exchange particles in the form of said beads,
- said anion exchange particles and said cation exchange particles are monodisperse, respectively, and
- wherein said fibrous ion-exchange material is a non-woven fibrous ion-exchange material and is arranged in layers, each said layer having a thickness of 1 mm up to 5 mm, said layers comprise either cation or anion exchange groups, and said layers comprising said cation-exchange groups and said layers comprising said anion-exchange groups being arranged in blocks, wherein said blocks are arranged as follows:
- 7×(C+2A)+C, 9×(C+2A)+C, 9×(C+3A)+C or 13×(C+2A)+C, wherein C is a layer of the cation-exchange groups and 2A is two consecutive layers of the anion-exchange groups, and 3A is three consecutive layers of the anion-exchange groups.
A water treatment system comprising a mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a fibrous ion-exchange material,
- wherein said mixed bed ion exchanger consists of a mixture of anion exchange particles in the form of said beads and cation exchange particles in the form of said beads,
- said anion exchange particles and said cation exchange particles are monodisperse, respectively, and
- wherein said fibrous ion-exchange material is a non-woven fibrous ion-exchange material and is arranged in layers, each said layer having a thickness of 1 mm up to 5 mm, said layers comprise either cation or anion exchange groups, and said layers comprising said cation-exchange groups and said layers comprising said anion-exchange groups being arranged in blocks, wherein said blocks are arranged as follows:
- 7×(C+2A)+C, 9×(C+2A)+C, 9×(C+3A)+C or 13×(C+2A)+C, wherein C is a layer of the cation-exchange groups and 2A is two consecutive layers of the anion-exchange groups, and 3A is three consecutive layers of the anion-exchange groups.
Dependencies are inferred from the claim text.