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Method for improving solubility of stannous pyrophosphate

A technology of stannous pyrophosphate and solubility, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems that have not been found, high product purity and not necessarily solubility, and achieve the goal of saving materials and energy and improving solubility Effect

Active Publication Date: 2019-08-23
GUANGXI NORMAL UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the above-mentioned documents, the purity of the product is adjusted from the perspectives of reaction temperature, pH value of the reaction system, washing times, drying time, etc., but the high purity of the product may not necessarily have high solubility, because if the product contains Sn(OH) 2 Such impurities, when determining the main component according to "HG / T4206-2011 Industrial Stannous Pyrophosphate", under acidic conditions, Sn(OH) 2 Soluble can also be detected as a product, while Sn(OH) 2 Insoluble in solubility assay in potassium pyrophosphate
At present, no public literature has been found to improve product purity from the perspective of solubility

Method used

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  • Method for improving solubility of stannous pyrophosphate
  • Method for improving solubility of stannous pyrophosphate
  • Method for improving solubility of stannous pyrophosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Add 850mL of distilled water into a 1000mL container, heat to 40°C, add 45g of sodium pyrophosphate decahydrate, stir at 300r / min to dissolve, and keep warm. In a 2000mL reactor, add 230mL of 1mol / L dilute hydrochloric acid, add 50g of stannous chloride, stir and dissolve to form a solution. After the dissolution is complete, heat to 40°C and add sodium pyrophosphate solution dropwise to the reactor at a stirring speed of 80r / min at a rate of 10mL / min, monitor with a pH meter until pH=1, add coke dropwise At the same time as the sodium phosphate solution, 1 mol / L hydrochloric acid was added dropwise to control the pH=1. When the reaction solution became supernatant, the dropwise addition was stopped, and the reaction was continued for 40 minutes. Centrifuge at 600r / min to dry, wash with 120mL of water, and wash with 15mL of 95% alcohol to obtain stannous pyrophosphate solid. The solid was dried at 100° C. for 50 minutes under vacuum at -0.06 MPa to obtain a total of 40...

Embodiment 2

[0032] Add 517mL of distilled water into a 1000mL container, heat to 40°C, add 45g of sodium pyrophosphate decahydrate, stir at 400r / min to dissolve, and keep warm. In a 2000mL reactor, add 148mL of 2mol / L dilute hydrochloric acid, add 50g of stannous chloride, stir and dissolve to form a solution. After the dissolution is complete, heat to 40°C and add sodium pyrophosphate solution dropwise into the reactor at a stirring speed of 100r / min at a rate of 10mL / min, monitor with a pH meter until pH=1, add coke dropwise At the same time as sodium phosphate, 2 mol / L hydrochloric acid was added dropwise to control the pH=1, when the reaction solution was supernatant, the dropwise addition was stopped, and the incubation reaction was continued for 60 minutes. Centrifuge at 700r / min to dry, wash with 120mL of water, and wash with 15mL of 95% alcohol to obtain stannous pyrophosphate solid. The solid was dried at 150° C. for 40 minutes under vacuum at -0.08 MPa to obtain a total of 38 g...

Embodiment 3

[0034] Add 405mL of distilled water into a 1000mL container, heat to 50°C, add 45g of sodium pyrophosphate decahydrate, stir at 400r / min to dissolve, and keep warm. In a 2000mL reactor, add 105mL of 3mol / L dilute hydrochloric acid, add 50g of stannous chloride, stir and dissolve to form a solution. After the dissolution is complete, heat to 50°C and add sodium pyrophosphate solution dropwise into the reactor at a stirring speed of 200r / min at a rate of 20mL / min, monitor with a pH meter until pH=1, add coke dropwise At the same time as sodium phosphate, add 3 mol / L hydrochloric acid dropwise to control the pH=1, stop the dropwise addition when the reaction solution is supernatant, and continue to keep warm for 80 minutes. Centrifuge at 600r / min to dry, wash with 120mL of water, and wash with 15mL of 95% alcohol to obtain stannous pyrophosphate solid. The solid was dried at 200° C. for 30 minutes under vacuum at -0.07 MPa to obtain a total of 36 g of the product. The yield of t...

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Abstract

The invention discloses a method for improving solubility of stannous pyrophosphate. The method comprises the following steps: with a sodium pyrophosphate solution and a stannous chloride solution asraw materials, carrying out a metathesis reaction under a certain condition, and carrying out centrifugal spin-drying, washing, drying and packaging on the reaction product. According to the method disclosed by the invention, the adding sequence is skillfully changed, specifically, the sodium pyrophosphate solution is added into the stannous chloride with added dilute hydrochloric acid, so that the whole reaction system is under an acidic condition; and meanwhile, through limit of reasonable pH value, reaction temperature, liquid adding speed and heat preservation time, generation of insolublesubstance Sn(OH)2 and Sn(OH)4 can be avoided, influence of tin hydrolysis on the product yield can be balanced when the pH value is greater than 1, and solubility of the product is also improved under the condition that a high-purity product is obtained.

Description

technical field [0001] The invention belongs to the field of stannous pyrophosphate preparation, and in particular relates to a method for improving the solubility of stannous pyrophosphate. Background technique [0002] The molecular formula of stannous pyrophosphate is Sn 2 P 2 o 7 , molecular weight 411.32, white crystal or amorphous powder, melting point 360.4°C, boiling point 1320°C (decomposition at 400°C), soluble in concentrated acid, insoluble in water. Stannous pyrophosphate is also an important inorganic chemical raw material, mainly used in cyanide-free electroplating, toothpaste filler, refining of clay, etc. Stannous pyrophosphate can slow down the settling velocity of paint fillers and improve paint performance. It can be used as a dechlorinating agent and a scorching agent for cotton cloth after bleaching. It can be used in leather treatment to make leather soft, plump, tough, waterproof, anti-folding, wear-resistant and other properties. It can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/42
CPCC01B25/42
Inventor 叶有明谢雪珍廖政达农永萍谢济运
Owner GUANGXI NORMAL UNIV OF SCI & TECH
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