Preparation method of platinum nitrate

A technology of platinum nitrate and hydrochloric acid, applied in chemical instruments and methods, ruthenium/rhodium/palladium/osmium/iridium/platinum compounds, inorganic chemistry, etc., can solve the problems of high impurity content of products, addition of stabilizers, low yield, etc. , to achieve the effect of increasing the precipitation reaction rate, increasing the reaction rate, and increasing the specific surface area

Pending Publication Date: 2022-01-14
浙江微通催化新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing preparation methods mainly include sodium nitrite reduction method, molten salt ultrasonic synergy method, hydroxyplatinum precipitation method, etc. These methods have disadvantages such as expensive reagents, high impurity content in the product, and the need to add stabilizers to the product solution.
[0003] Patent US3666412 discloses a method for preparing platinum nitrate, mainly dissolving platinum dichloride in nitric acid solution, and obtaining platinum nitrate by continuously catching up with hydrochloric acid, but because the binding ability of chloride ion and platinum is stronger than that of nitrate ions and nitrate ions are easier to decompose and volatilize than chloride ions, resulting in more residual chloride ions in platinum nitrate, which seriously affects the quality of platinum nitrate products
[0004] Patent CN104310498B discloses a preparation method of platinum nitrate, which uses sponge platinum to react with aqua regia, and makes chloroplatinic acid after nitrate removal, which can reduce the residual chloride ions, but the patent subsequently uses oxalic acid to reduce chloroplatinic acid After forming chloroplatinous acid, it is precipitated and dissolved to produce platinum nitrate, which has the problem of low yield

Method used

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preparation example Construction

[0037] A preparation method for platinum nitrate, comprising the following steps:

[0038] (1) Platinum sponge is dissolved completely with a mixed solution of nitric acid and hydrochloric acid, and after concentrating, catch up with the nitric acid with concentrated hydrochloric acid, separate the product, and obtain the chloroplatinic acid solid;

[0039] (2) After heating the chloroplatinic acid solid at a rate of 13-18° C. / h to 350° C.-360° C., and keeping it warm for 0.5-1 hour, a solid platinum chloride is obtained;

[0040] (3) dissolving the platinous chloride solid in hydrochloric acid of 0.5~6mol / L, the mass volume ratio of the platinous chloride solid and hydrochloric acid is 1g:4~6mL, obtains the chloroplatinous acid solution;

[0041] (4) Heating the chloroplatinous acid solution to 70-90° C., and then adding 30-50 wt % sodium hydroxide solution dropwise therein until the pH is 7-8. After the addition is completed, continue to react for 2-6 hours, and separate Pr...

Embodiment 1

[0048] A preparation method for platinum nitrate, comprising the following steps:

[0049] (1) Add sponge platinum in batches to hot aqua regia (the volume ratio of concentrated hydrochloric acid to concentrated nitric acid is 3:1, the density of concentrated hydrochloric acid is 1.18g / mL, and the density of concentrated nitric acid is 1.42g / mL). Based on the principle of not sinking, after the dissolution is complete, concentrate to a platinum content of 600g / L. When hot, add concentrated hydrochloric acid (density 1.18g / mL) until no brown gas escapes from the solution. Transfer the solution to an evaporating dish and evaporate it to nearly dryness. , adding deionized water repeatedly 3 times to drive away the acid, evaporated to dryness under stirring, and obtained chloroplatinic acid solid;

[0050] (2) Place the chloroplatinic acid solid in a muffle furnace, raise the temperature from room temperature to 350° C. at a rate of 50° C. for 3 hours, and keep it at 350° C. for 50 ...

Embodiment 2

[0056] A preparation method for platinum nitrate, comprising the following steps:

[0057] (1) Add sponge platinum in batches to hot aqua regia (the volume ratio of concentrated hydrochloric acid to concentrated nitric acid is 4:1, the density of concentrated hydrochloric acid is 1.18g / mL, and the density of concentrated nitric acid is 1.42g / mL), and the speed of adding Based on the principle of not sinking, after the dissolution is complete, concentrate to a platinum content of 700g / L. When hot, add concentrated hydrochloric acid (density 1.18g / mL) until no brown gas escapes from the solution. Transfer the solution to an evaporating dish and evaporate it to nearly dryness. , adding deionized water repeatedly 3 times to drive away the acid, evaporated to dryness under stirring, and obtained chloroplatinic acid solid;

[0058] (2) Place the chloroplatinic acid solid in a muffle furnace, raise the temperature from room temperature to 355° C. at a rate of 50° C. for 3 hours, and ...

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Abstract

The invention relates to the technical field of inorganic synthesis, and discloses a preparation method of platinum nitrate, which comprises the following steps of: (1) completely dissolving sponge platinum in a mixed solution of nitric acid and hydrochloric acid, concentrating, removing nitrate by using concentrated hydrochloric acid, and separating a product to obtain a chloroplatinic acid solid; (2) heating and decomposing the chloroplatinic acid solid to obtain a platinous chloride solid; (3) dissolving the platinous chloride solid in hydrochloric acid to obtain a chloroplatinous acid solution; (4) adding a sodium hydroxide solution into the chloroplatinous acid solution for precipitation reaction, separating out a precipitation reaction product, and washing the precipitation reaction product to remove chloride ions to obtain a platinum-containing precipitate; and (5) mixing the platinum-containing precipitate with concentrated nitric acid, reacting, and separating a product to obtain platinum nitrate. According to the method, chloroplatinic acid is converted into chloroplatinous acid by adopting a mode of firstly decomposing at high temperature and then dissolving with hydrochloric acid, so that the yield of platinum nitrate can be improved.

Description

technical field [0001] The invention relates to the technical field of inorganic synthesis, in particular to a preparation method of platinum nitrate. Background technique [0002] Platinum nitrate is an important compound of the noble metal platinum. As a precursor, it is widely used in the preparation of various platinum-containing catalysts, the synthesis of other platinum compounds, and the electroplating industry. At present, there are only a small amount of literature reports on the preparation method of platinum nitrate. The existing preparation methods mainly include sodium nitrite reduction method, molten salt ultrasonic synergistic method, hydroxyplatinum precipitation method, etc. These methods have disadvantages such as expensive reagents, high impurity content in the product, and the need to add stabilizers to the product solution. [0003] Patent US3666412 discloses a method for preparing platinum nitrate, mainly dissolving platinum dichloride in nitric acid s...

Claims

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Application Information

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IPC IPC(8): C01G55/00
CPCC01G55/00
Inventor 谢智平陈华王惟杨立强罗来彬陈小勤潘剑明马银标
Owner 浙江微通催化新材料有限公司
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