Patent ID: 6183637
Filing Date: 2001-02-06
Classification: C02F

Abstract:
A purification system for the production of ultrapure water comprising:a source of water;a resin bed comprising an inlet for receiving water from said source, a plurality of resin particles for intimately contacting the water and removing ions from the water, and an outlet; anda resin trap device external to said resin bed and in fluid communication with the outlet of the resin bed comprising:a housing, anda resin strainer disposed within said housing, said strainer including a plurality of openings having a particle pass size of between about 100 .mu.m and about 250 .mu.m,whereby water from the outlet of said resin bed enters said resin trap device, water and small particles having a diameter of less than the particle pass size flow through said openings and flow out of said resin trap device, and large particles having a diameter of greater than the particle pass size are retained in the resin trap device; andan ultrafilter downstream from said resin trap device for filtering the water to produce ultrapure water having a specific resistivity of greater than or equal to 18 M.multidot.ohm.multidot.cm at 20.degree. C.;wherein said water purification system is free of microfilters having a maximum particle pass size of between 0.1 .mu.m and 1 .mu.m downstream from said resin bed and upstream from said ultrafilter.