# US 10,504,628 B2 · Platinum oxide colloidal solution, manufacturing method therefor, manufacture apparatus thereof, and method of injection noble metal of boiling water nuclear power plant

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- Number: US 10,504,628 B2
- Document ID: US10504628B2
- Status: Granted
- Kind: B2
- Application number: 15/583,464
- Filed: 2017-05-01
- Published: 2017-08-17
- Granted: 2019-12-10
- Earliest claimed: 2012-11-19
- Assignees: Hitachi-GE Nuclear Energy, Ltd.
- Applicants: Hitachi-GE Nuclear Energy Ltd.
- Inventors: Kazushige Ishida; Masahiko Tachibana; Yoichi Wada; Nobuyuki Ota
- Web page: https://patentgrep.com/patent/US10504628B2

## CPC

- B01D 15/362: {Cation-exchange}
- G21C 15/28: Selection of specific coolants (if serving as the moderator G21C5/12; compositions per se C09K5/00; {organic coolants G21C5/123}); {Additions to the reactor coolants, e.g. against moderator corrosion (purification and regeneration of the reactor coolants G21C19/30)}
- B01J 13/0047: {containing a metal oxide}
- B01J 19/082: {Gamma-radiation only}
- B01J 23/42: Platinum
- B01J 37/344: {of electromagnetic wave energy}
- B01J 39/04: Processes using organic exchangers
- B01J 39/18: Macromolecular compounds (B01J39/17 takes precedence)
- C02F 1/42: by ion-exchange (ion-exchange in general B01J)
- G21C 17/0225: {Chemical surface treatment, e.g. corrosion (corrosion prevention in presence of water from scale removal or by modification of the properties of the liquid C02F5/00; inhibiting corrosion by adding corrosion inhibitors C23F11/00)}
- B01J 2219/0877: Liquid
- B01J 2219/12: Processes employing electromagnetic waves
- Y02E 30/30: Nuclear fission reactors
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- G21C: NUCLEAR REACTORS (fusion reactors, hybrid fission-fusion reactors G21B; nuclear explosives G21J)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An aqueous solution of alkali hexahydroxo platinate is produced. As a alkali hexahydroxo platinate, sodium hexahydroxoplatinate or potassium hexahydroxoplatinate is used. The aqueous solution of alkali hexahydroxo platinate is passed through a hydrogen form cation exchange resin layer in a cation exchange resin tower. The aqueous solution of alkali hexahydroxo platinate makes contact with the hydrogen form cation exchange resin of the hydrogen form cation exchange resin layer, thus a suspension of hexahydroxo platinic is generated. If gamma rays are irradiated to the suspension, a platinum oxide colloidal solution in which colloidal particles including a platinum dioxide, a platinum monoxide, and a platinum hydroxide exist is generated. In a platinum oxide colloidal solution, the content of impurities is little and a noble metal compound is dispersed stably in water.

## Claims

### Claim 1

A method of manufacturing a platinum oxide colloid comprising:
(1) an ion exchange process of substituting hydrogen ions for cations included in an aqueous solution of hexahydroxoplatinate salt to generate a suspension; and
(2) irradiating gamma rays to said suspension to generate the platinum oxide colloid.

### Claim 2 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein said aqueous solution of hexahydroxoplatinate salt comes into contact with a hydrogen form cation exchange resin in said ion exchange process.

### Claim 3 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein said hexahydroxoplatinate salt is sodium hexahydroxoplatinate or potassium hexahydroxoplatinate.

### Claim 4 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein said aqueous solution of hexahydroxoplatinate salt includes alcohol.

### Claim 5 (depends on 4)

The method of manufacturing a platinum oxide colloid according to claim 4, wherein when the number of carbons configuring a molecule of said alcohol is n, a concentration of said alcohol in the aqueous solution of hexahydroxoplatinate salt is lower than 0.17/n (mM).

### Claim 6 (depends on 4)

The method of manufacturing a platinum oxide colloid according to claim 4, wherein when the number of carbons configuring a molecule of said alcohol is n, a concentration of said alcohol in the aqueous solution of hexahydroxoplatinate salt is 0.03/n (mM) or lower.

### Claim 7 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein an irradiation quantity of said gamma rays is 7 kGy or larger.

### Claim 8 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein said colloid comprises platinum oxide and platinum hydroxide.

### Claim 9 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein said irradiating gamma rays to said suspension is executed before said colloid is injected into a coolant of a water-cooled nuclear reactor.

### Claim 10 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein each surface of particles of said colloid is negatively charged at pH 5.6 or higher.

### Claim 11 (depends on 1)

The method of manufacturing a platinum oxide colloid according to claim 1, wherein particles of said colloid have a diameter in a range from 1.0 nm to 4.5 nm.