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Preparation method of electroplating-grade potassium pyrophosphate

A technology of potassium pyrophosphate and electroplating grade, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve problems such as increased production costs, high production energy consumption, and uneven heating of dipotassium hydrogen phosphate

Pending Publication Date: 2020-10-20
CHENGDU HUARONG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the calcination process of this preparation method, especially in industrialized large equipment, there are problems such as uneven heating of dipotassium hydrogen phosphate, high production energy consumption, easy agglomeration of the product, uneven state, low product purity, and low reaction conversion rate. , and due to the introduction of combustible gas such as natural gas for calcination, the powder in the furnace will be carried out, and it is necessary to install a dust removal device at the outlet of the tail gas, which increases the production cost

Method used

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  • Preparation method of electroplating-grade potassium pyrophosphate
  • Preparation method of electroplating-grade potassium pyrophosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) 11.5 tons of 85wt% phosphoric acid aqueous solution and 23.4 tons of 48wt% potassium hydroxide aqueous solution were neutralized and reacted, the reaction temperature was 90~95° C., and the pH of the neutralizing solution was controlled at 8.3~8.7 to obtain dipotassium hydrogen phosphate solution.

[0030] (2) Evaporating and concentrating the obtained dipotassium hydrogen phosphate solution to obtain dipotassium hydrogen phosphate crystal slurry with a water content of 30 wt%.

[0031] (3) The wet dipotassium hydrogen phosphate crystal is sent to a microwave belt drying line by a conveyor belt for microwave drying to obtain a dipotassium hydrogen phosphate solid. The drying power is 27KW, the heating temperature is 100° C., and the time is 1.5 to 2 hours.

[0032] (4) Send the dried dipotassium hydrogen phosphate solid through a conveyor belt into a microwave high-temperature kiln for polymerization to obtain potassium pyrophosphate. The heating power is 58.5KW, the...

Embodiment 2

[0035] (1) 11.5 tons of 85wt% phosphoric acid aqueous solution and 23.4 tons of 48wt% potassium hydroxide aqueous solution were neutralized and reacted, the reaction temperature was 90~95° C., and the pH of the neutralizing solution was controlled at 8.3~8.7 to obtain dipotassium hydrogen phosphate solution.

[0036] (2) Evaporating and concentrating the obtained dipotassium hydrogen phosphate solution to obtain dipotassium hydrogen phosphate crystal slurry with a water content of 30 wt%.

[0037] (3) The wet dipotassium hydrogen phosphate crystal is sent to a microwave belt drying line by a conveyor belt for microwave drying to obtain a dipotassium hydrogen phosphate solid. The drying power is 27KW, the heating temperature is 80° C., and the time is 1.5 to 2 hours.

[0038] (4) Send the dried dipotassium hydrogen phosphate solid through a conveyor belt into a microwave high-temperature kiln for polymerization to obtain potassium pyrophosphate. The heating power is 58.5KW, the ...

Embodiment 3

[0041] (1) 11.5 tons of 85wt% phosphoric acid aqueous solution and 23.4 tons of 48wt% potassium hydroxide aqueous solution were neutralized and reacted, the reaction temperature was 90~95° C., and the pH of the neutralizing solution was controlled at 8.3~8.7 to obtain dipotassium hydrogen phosphate solution.

[0042] (2) Evaporating and concentrating the obtained dipotassium hydrogen phosphate solution to obtain dipotassium hydrogen phosphate crystal slurry with a water content of 30 wt%.

[0043] (3) The wet dipotassium hydrogen phosphate crystal is sent to a microwave belt drying line by a conveyor belt for microwave drying to obtain a dipotassium hydrogen phosphate solid. The drying power is 27KW, the heating temperature is 120° C., and the time is 1.5 to 2 hours.

[0044] (4) Send the dried dipotassium hydrogen phosphate solid through a conveyor belt into a microwave high-temperature kiln for polymerization to obtain potassium pyrophosphate. The heating power is 58.5KW, the...

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Abstract

The invention discloses a preparation method of electroplating-grade potassium pyrophosphate. The preparation method comprises the following steps: carrying out microwave drying on wet dipotassium hydrogen phosphate, and carrying out microwave heating to generate potassium pyrophosphate. A potassium pyrophosphate product obtained by the method has the advantages of high purity, strong complexing power, uniform state, no caking phenomenon and high raw material conversion rate.

Description

technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a preparation method of electroplating grade potassium pyrophosphate. Background technique [0002] Potassium pyrophosphate, also known as tetrapotassium pyrophosphate, is obtained by melting dipotassium hydrogen phosphate and losing water molecules. It is white crystalline powder or granules at room temperature and has strong hygroscopicity in the air. The molecular formula is K 4 P 2 o 7 , is an important chemical product, commonly used in cyanide-free electroplating, surface treatment, high-grade detergents, paint coatings, cleaners, dispersants, buffers, etc. in industry; food-grade potassium pyrophosphate is often used as an emulsifier in food processing , tissue modifier, chelating agent, etc. [0003] The preparation method of potassium pyrophosphate in the traditional process is to concentrate the dipotassium hydrogen phosphate solution generated by the n...

Claims

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Application Information

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IPC IPC(8): C01B25/42
CPCC01B25/425C01P2006/80C01P2006/10
Inventor 魏东陈太辉张天兰陈浩冯冬娅
Owner CHENGDU HUARONG CHEM CO LTD
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