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Preparation method of stannous oxalate

A technology of stannous oxalate and potassium oxalate, which is applied in the field of metallurgy and chemical industry, can solve the problems of raw material waste, slow reaction speed, and low yield, and achieve the effect of improving product purity, increasing purity, and increasing yield

Pending Publication Date: 2019-08-27
JIANGSU XINLU CHEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the direct mixed reaction of oxalate and stannous salt can obtain stannous oxalate, the process is simple, but the reaction speed is slow, and there are many residual impurities, resulting in lower yield, resulting in waste of raw materials, and the purity of the product obtained is lower. Makes the product less effective when applied

Method used

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  • Preparation method of stannous oxalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of stannous oxalate, comprising the following steps:

[0028] Add the inhibitor to the industrial water, add potassium oxalate powder in 5 times, the temperature of the industrial water is 50°C, stir and dissolve, the potassium oxalate powder includes potassium oxalate and ammonium chloride, the potassium oxalate and ammonium chloride The mass ratio is 5:1, and the pH value of the solution is 6 to obtain a weak acid solution, and the inhibitor accounts for 5% of the weak acid solution weight;

[0029] Add stannous chloride to the weak acid solution, keep a constant temperature of 50°C for 2 hours, adjust the pH value of the solution to 7, and obtain a weak alkali solution;

[0030] Adjust the temperature of the weak alkali solution to 35°C, filter to obtain a precipitate;

[0031] The precipitate is washed and dried under reduced pressure to obtain the stannous oxalate.

[0032] Among the above raw materials, the mass ratio of the industrial water...

Embodiment 2

[0041] A preparation method of stannous oxalate, comprising the following steps:

[0042] Add the inhibitor to the industrial water, add potassium oxalate powder in 5 times, the temperature of the industrial water is 60°C, stir and dissolve, the potassium oxalate powder includes potassium oxalate and ammonium chloride, the potassium oxalate and ammonium chloride The mass ratio of the solution is 5:1.5, and the pH value of the solution is adjusted to be 7 to obtain a weak acid solution;

[0043] Add stannous chloride to the weak acid solution, keep a constant temperature of 60° C. for 2 hours, adjust the pH value of the solution to 8, and obtain a weak alkali solution, and the inhibitor accounts for 5% of the weight of the weak acid solution;

[0044] Adjust the temperature of the weak lye to 40°C, filter to obtain a precipitate;

[0045] The precipitate is washed and dried under reduced pressure to obtain the stannous oxalate.

[0046] Among the above raw materials, the mass...

Embodiment 3

[0052] A preparation method of stannous oxalate, comprising the following steps:

[0053] Add the inhibitor to the industrial water, add potassium oxalate powder in 5 times, the temperature of the industrial water is 58°C, stir and dissolve, the potassium oxalate powder includes potassium oxalate and ammonium chloride, the potassium oxalate and ammonium chloride The mass ratio is 5:1.2, and the pH value of the solution is 6 to obtain a weak acid solution, and the inhibitor accounts for 5% of the weak acid solution weight;

[0054] Add stannous chloride to the weak acid solution, keep a constant temperature of 55°C for 2 hours, adjust the pH value of the solution to 8, and obtain a weak alkali solution;

[0055] Adjust the temperature of the weak lye to 40°C, filter to obtain a precipitate;

[0056] The precipitate is washed and dried under reduced pressure to obtain the stannous oxalate.

[0057] Among the above raw materials, the mass ratio of the industrial water, potassiu...

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Abstract

The invention discloses a preparation method of stannous oxalate. The preparation method of the stannous oxalate comprises the following steps: adding an inhibitor to industrial water, adding a potassium oxalate powder to the industrial water for 5 times, stirring and dissolving an obtained mixture, and adjusting the pH value of a solution to 6-7 to obtain a weak acid liquor; adding stannous chloride to the weak acid liquor, preserving the heat of an obtained mixture for reaction, and adjusting the pH value of a solution to 7-8 to obtain a weak alkali liquor; adjusting the temperature of the weak alkali liquor to 35-40 degrees centigrade, and filtering the weak alkali liquor to obtain precipitates; washing the precipitates; and decompressing and drying the precipitates to obtain the stannous oxalate. By separately treating the potassium oxalate powder and the stannous chloride, the yield is increased, and the product purity is enhanced; the separation of other crytals can be reduced when the precipitates are filtered at a certain temperature so that the product purity is further improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a preparation method of stannous oxalate. Background technique [0002] Tin oxalate (stannous oxalate, tin II oxalate), is a white powder, soluble in dilute hydrochloric acid, insoluble in water, and is widely used in the field of metallurgy as a catalyst. [0003] At present, when producing stannous oxalate, generally directly adopt the mixed reaction of oxalate and stannous salt, and the reaction equation is: [0004] [0005] The stannous oxalate can be obtained directly. [0006] Although the direct mixed reaction of oxalate and stannous salt can obtain stannous oxalate, the process is simple, but the reaction speed is slow, and there are many residual impurities, resulting in lower yield, resulting in waste of raw materials, and the purity of the product obtained is lower. This makes the product less effective when applied. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/41C07C55/07
CPCC07C51/412C07C55/07
Inventor 孙敬元郑建沈晖
Owner JIANGSU XINLU CHEM NEW MATERIAL