Patent ID: 11897790
Assignee: ORGANO CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for producing ultrapure water to supply, to a use point, the ultrapure water obtained by treating raw material water for ultrapure water production in an ultrapure water production apparatus,
wherein the raw material water for ultrapure water production contains metal impurities of both of:
at least one element selected from the group consisting of B and As, and
at least one element selected from the group consisting of Al, Ti, Cr, Fe, Cu, Zn, Sn, V, Ga, and Pb,

wherein an ion exchanger-filled module filled with at least a monolithic organic porous anion exchanger is installed in a treatment path of the ultrapure water production apparatus or in a transfer path from the ultrapure water production apparatus to the use point, and the raw material water to be treated is passed through the ion exchanger-filled module for treatment, and
wherein the raw material water to be treated is passed through the monolithic organic porous anion exchanger-filled module at a water passing speed SV of greater than or equal to 1274 h−1 and less than or equal to 20000 h−1 to remove the metal impurities from the raw material water and produce the ultrapure water.