Method for producing ultrapure water
AssigneeMerck Patent GmbH
InventorsIchiro Kano, Gabriela Dima, 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 first mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a step (b) of passing water through a second mixed bed ion exchanger comprising beads having a diameter of less than 0.5 mm. The invention further relates to a module comprising the first and second mixed bed ion exchanger and to a water treatment system for producing ultrapure water comprising the first and second mixed bed ion exchanger.
Claims18
A method for producing purified water comprising a step (a) of passing water through a first mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a step (b) of passing water through a second mixed bed ion exchanger comprising beads having a diameter of less than 0.5 mm, wherein the ratio of the volume of the first mixed bed ion exchanger to the volume of the second mixed bed ion exchanger is between 10:1 and 1:1, and wherein the water is not passed through any other ion exchanger to produce said purified water.
A module comprising a first mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a second mixed bed ion exchanger comprising beads having a diameter of less than 0.5 mm, wherein the ratio of the volume of the first mixed bed ion exchanger to the volume of the second mixed bed ion exchanger is between 10:1 and 1:1, and wherein the module is devoid of any additional ion exchanger.
A water treatment system for producing ultrapure water having a resistivity greater than 18 MΩ-cm, comprising a first mixed bed ion exchanger comprising beads having a diameter between 0.5 and 0.7 mm and a second mixed bed ion exchanger comprising beads having a diameter of less than 0.5 mm, wherein the ratio of the volume of the first mixed bed ion exchanger to the volume of the second mixed bed ion exchanger is between 10:1 and 1:1, and wherein the system is devoid of any additional ion exchanger to produce said ultrapure water.
Dependencies are inferred from the claim text.