# US 10,767,276 B2 · Method and device for regenerating a platinum bath

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- Number: US 10,767,276 B2
- Document ID: US10767276B2
- Status: Granted
- Kind: B2
- Application number: 16/345,420
- Filed: 2017-10-17
- Published: 2019-08-15
- Granted: 2020-09-08
- Earliest claimed: 2016-10-27
- Assignees: Safran Aircraft Engines; Centre National De La Recherche Scientifique
- Applicants: Safran Aircraft Engines; Institut National Polytechnique de Toulouse; Centre National de la Recherche Scientifique
- Inventors: Auriane Gengo; Sébastien Elgue; Laurent Prat
- Web page: https://patentgrep.com/patent/US10767276B2

## CPC

- C25D 21/18: of electrolytes (C25D21/22 takes precedence)
- C25D 3/50: of platinum group metals
- C25D 3/567: {containing more than 50% by weight of platinum group metals}
- C25D 21/12: Process control or regulation (controlling or regulating in general G05)
- C25D 21/02: Heating or cooling
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

A method of regenerating a platinum bath by flow reaction, the method comprising the successive steps of: drawing off fluid from the platinum bath by means of a draw-off flow; complexing platinum by mixing together the draw-off flow and a regeneration solution flow containing platinum, mixing taking place in an intensified reactor; and feeding the platinum bath with the mixture resulting from the platinum complexing step, by means of a regenerated bath flow; all of these steps being performed as a continuous flow.

## Claims

### Claim 1

A method of regenerating a platinum bath by flow reaction, the method comprising the successive steps of:
drawing off fluid from the platinum bath by means of a draw-off flow;
complexing platinum by mixing together the draw-off flow and a regeneration solution flow containing platinum, mixing taking place in an intensified reactor, wherein the step of complexing in the reactor comprises the steps of:
preheating the draw-off flow and the regeneration solution flow so that their respective temperatures are equal to a predetermined temperature higher than the temperature of the platinum bath;
mixing the draw-off flow with the regeneration solution flow so as to form a platinum complex; and
feeding the platinum bath with the mixture resulting from the platinum complexing step, by means of a regenerated bath flow;
all of these steps being performed as a continuous flow.

### Claim 2 (depends on 1)

A method according to claim 1, further comprising:
thermal monitoring, for a predetermined time, of the mixture formed in the complexing step in order to ensure that the temperature of the mixture is equal to the predetermined temperature during the complexing step.

### Claim 3 (depends on 2)

A method according to claim 2, wherein, after the step of thermal monitoring, the mixture is returned to a temperature of 64° C. in a tank located downstream from the reactor.

### Claim 4 (depends on 1)

A method according to claim 1, wherein the rate at which the reactor is fed with the draw-off flow is 80 g/min, and the rate at which the reactor is fed with the regeneration solution flow is 10 g/min.

### Claim 5 (depends on 1)

A method according to claim 1, wherein the concentration of platinum in the platinum bath is maintained continuously at a value lying in an interval of 1 g/L.

### Claim 6 (depends on 1)

A method according to claim 1, wherein the temperature of the platinum bath is maintained at a value lying in an interval of 4° C.