TECHNICAL FIELD

The present invention relates to a metal removing column for removing trace metal in an organic solvent and an ion exchanger filled cartridge used for the same.

BACKGROUND ART

As an art for removing the trace metal in a liquid to be treated, an art in which an ion exchange resin is filled in a cartridge and the liquid to be treated is directly passed through the cartridge so as to obtain a treated liquid and an art in which the ion exchange resin is filled in the cartridge, an accommodating container covering it is further provided, the liquid to be treated passes between the cartridge and the accommodating container and then, passes through the cartridge so as to obtain the treated liquid are known (Patent Literature 1, Patent Literature 2, Patent Literature 3).

Since such refinement using the cartridge in which the ion exchange resin is filled can be realized with a small plant investment, demand is increasing not only in manufacture of pure water but also in solvent refinement such as IPA (isopropanol), PGMEA (propylene glycol monomethyl ether acetate), PGME (propylene glycol monomethyl ether), PGEE (propylene glycol monoethyl ether) and the like or particularly in refinement of high purity solvent.

Moreover, in order to reduce impurities in the organic solvent to a ppt level, refinement by the ion exchange resin is needed.

CITATION LIST

Patent Literature

[Patent Literature 1] Japanese Patent Laid-Open No. 9-271770

[Patent Literature 2] Japanese Patent No. 4801870

[Patent Literature 3] Japanese Patent Laid-Open No. 2004-41854

SUMMARY OF INVENTION

Technical Problem

However, these prior arts have a problem that when the ion exchange resin in the cartridge is to be replaced after the ion exchange resin comes to the end of life, or when the cartridge in which the ion exchange resin is filled is to be replaced, impurities are mixed in a refinement system, and the treated liquid is contaminated.

Therefore, an object of the present invention is to provide a metal removing column in which the impurities are not mixed in the refinement system, and the treated liquid is not contaminated when the cartridge in which the ion exchanger is filled is to be replaced and an ion exchanger filled cartridge used for the same.

Solution to Problem

The problem as above is solved by the following present invention:

That is, the present invention (1) provides an ion exchanger filled cartridge accommodated inside an accommodating container of a metal removing column and in which an ion exchanger is filled, including:

a cylinder portion;

an upper lid in which a through hole for a liquid to be treated is formed and which is provided on an upper end of the cylinder portion;

a lower lid in which a through hole for a treated liquid is formed and which is provided on a lower end of the cylinder portion;

an insertion pipe connected to the lower lid, having an O-ring attached to an outer side, and inserted into a treated liquid discharge pipe provided on a bottom portion of the accommodating container of the metal removing column; and

the ion exchanger filled inside the cylinder portion.

Moreover, the present invention (2) provides an ion exchanger filled cartridge in (1), in which the cylinder portion is made of polytetrafluoroethylene (PTFE).

Moreover, the present invention (3) provides an ion exchanger filled cartridge in (1) or (2), in which an upper-end side pipe-diameter reducing portion whose inner diameter of the cylinder portion decreases as it goes toward the upper end of the cylinder portion and a lower-end side pipe-diameter reducing portion whose inner diameter of the cylinder portion decreases as it goes toward the lower end of the cylinder portion are formed inside the cylinder portion.

Moreover, the present invention (4) provides an ion exchanger filled cartridge in any one of (1) to (3), including an upper-lid sandwiching member in which a passage port for the liquid to be treated is formed and an upper-lid side ion exchanger outflow preventing member, in which the upper-lid side ion exchanger outflow preventing member is sandwiched between the upper lid and the upper-lid sandwiching member.

Moreover, the present invention (5) provides an ion exchanger filled cartridge in (4), in which

the upper-lid sandwiching member is made of an O-shaped outer side portion having a thread or a screw groove formed on an outer peripheral surface and a cross-shaped or X-shaped inner side portion provided on an inner side in a radial direction of the outer side portion;

the upper lid has an upper-lid sandwiching member fixing portion having a screw groove or a thread screwed with a thread or a screw groove of the upper-lid sandwiching member formed on an inner peripheral surface; and

the upper-lid sandwiching member is screwed with the upper-lid sandwiching member fixing portion.

Moreover, the present invention (6) provides an ion exchanger filled cartridge in any one of (1) to (5), including a lower-lid sandwiching member in which a passage port for the treated liquid is formed and a lower-lid side ion exchanger outflow preventing member, in which the lower-lid side ion exchanger outflow preventing member is sandwiched between the lower lid and the lower-lid sandwiching member.

Moreover, the present invention (7) provides an ion exchanger filled cartridge in (6), in which

the lower-lid sandwiching member is made of an O-shaped outer side portion having a thread or a screw groove formed on an outer peripheral surface and a cross-shaped or X-shaped inner side portion provided on an inner side in a radial direction of the outer side portion;

the lower lid has a lower-lid side sandwiching member fixing portion having a screw groove or a thread screwed with a thread or a screw groove of the lower-lid sandwiching member formed on an inner peripheral surface; and

the lower-lid sandwiching member is screwed with the lower-lid side sandwiching member fixing portion.

Moreover, the present invention (8) provides a metal removing column including:

an accommodating container;

a supply port for liquid to be treated formed in the accommodating container and supplying a liquid to be treated into the accommodating container;

a treated liquid discharge pipe attached to a bottom side of the accommodating container and communicating with the inside of the accommodating container; and

the ion exchanger filled cartridge according to any one of (1) to (7) accommodated inside the accommodating container, in which

the insertion pipe is inserted into the treated liquid discharge pipe, and an O-ring attached to an outer side of the insertion pipe is brought into close contact with an inner wall of the treated liquid discharge pipe and the outer side of the insertion pipe so that a space between the inner wall of the treated liquid discharge pipe and the outer side of the insertion pipe is sealed.

Advantageous Effect of Invention

According to the present invention, when a cartridge in which the ion exchangers are filled is to be replaced, the metal removing column in which impurities are not mixed in the refinement system, and the treated liquid is not contaminated can be provided. Moreover, according to the present invention, an ion exchanger filled cartridge used for the metal removing column can be provided.

