Method for dissolving tin (II) oxide

Patent metadata

Field	Value
Publication number	US-12043914-B2
Application number	US-202017629696-A
Country	US
Kind code	B2
Filing date	May 1, 2020
Priority date	Aug 1, 2019
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

The present invention provides a method for producing an aqueous tin methanesulfonate solution by dissolving tin (II) oxide in an aqueous methanesulfonic acid solution, wherein if A is the number of moles of the tin (II) oxide and B is the number of moles of the methanesulfonic acid, the value of B/2A is within the range of from 1.0 to 1.4. This method for dissolving tin (II) oxide into an aqueous methanesulfonic acid solution is able to achieve a high tin ion concentration.

First claim

The invention claimed is:

1. A method comprising a step of dissolving tin (II) oxide in an aqueous methanesulfonic acid solution to produce an aqueous tin methanesulfonate solution,
wherein a value of B/2A is in a range of from 1.00 to 1.09, in which A is the number of moles of tin (II) oxide; and B is the number of moles of methanesulfonic acid,
wherein the temperature of the aqueous methanesulfonic acid solution is maintained in the range of from about 30 to 50° C.,
wherein when tin (II) oxide is completely dissolved in the aqueous methanesulfonic acid solution, a content of tin present as Sn 2+ ions is in a range of from 300 to 450 g/L, and
wherein the tin (II) oxide is a tin (II) oxide powder that is added to the aqueous methanesulfonic acid solution, stirred and dissolved to produce the aqueous tin methanesulfonate solution.

2. The method according to claim 1 , wherein the value of B/2A is in a range of from 1.01 to 1.05.

3. The method according to claim 1 , wherein the tin (II) oxide powder is added to the aqueous methanesulfonic acid solution continuously over 1 to 10 minutes, stirred and dissolved to produce an aqueous tin methanesulfonate solution.

4. The method according to claim 1 , wherein the number of moles of tin (II) oxide A is the number of moles of the total amount of tin (II) oxide used for dissolution, and wherein the number of moles of methanesulfonic acid B is the number of moles of the total amount of methanesulfonic acid used for dissolution.

5. A method for supplementing a tin plating solution with tin ions, the method comprising a step of adding the aqueous tin methanesulfonate solution produced by the method for dissolving tin (II) oxide in an aqueous methanesulfonic acid solution to produce an aqueous tin methanesulfonate solution,
wherein a value of B/2A is in a range of from 1.00 to 1.09, in which A is the number of moles of tin (II) oxide; and B is the number of moles of methanesulfonic acid,
wherein the temperature of the aqueous methanesulfonic acid solution is maintained in the range of from about 30 to 50° C.,
wherein when tin (II) oxide is completely dissolved in the aqueous methanesulfonic acid solution, a content of tin present as Sn2+ ions is in a range of from 300 to 450 g/L, and
wherein the tin (II) oxide is a tin (II) oxide powder that is added to the aqueous methanesulfonic acid solution, stirred and dissolved to produce the aqueous tin methanesulfonate solution.

6. A method for supplementing a tin plating solution with tin ions, the method comprising a step of adding the aqueous tin methanesulfonate solution produced by the method according to claim 1 to the tin plating solution.

7. A method for supplementing a tin plating solution with tin ions, the method comprising a step of adding the aqueous tin methanesulfonate solution produced by the method according to claim 2 to the tin plating solution.

8. A method for supplementing a tin plating solution with tin ions, the method comprising a step of adding the aqueous tin methanesulfonate solution produced by the method according to claim 3 to the tin plating solution.

9. A method for supplementing a tin plating solution with tin ions, the method comprising a step of adding the aqueous tin methanesulfonate solution produced by the method according to claim 4 to the tin plating solution.

Assignees

• Jx Nippon Mining & Metals Corp
• Jx Metals Corp

Inventors

• Takemoto Koichi

Classifications

• C25D3/30

  of tin · CPC title

• C25D21/14

  Controlled addition of electrolyte components · CPC title

• C07C309/04

  containing only one sulfo group · CPC title

• C07C303/32 Primary

  of salts of sulfonic acids · CPC title

• C25D3/32 Primary

  characterised by the organic bath constituents used · CPC title