ජූලි . 05, 2024 14:33 Back to list

Method for producing sodium hexametaphosphate by sodium chloride method

Abstract

The invention provides a method for producing sodium hexametaphosphate by a sodium chloride method, which comprises that: according to the mol ratio of 1:1, sodium chloride and phosphoric acid are evenly mixed and subjected to melt polymerization at a temperature of between 650 and 700 DEG C for at least 30 minutes so as to completely remove chlorine hydride; and the product is subjected to quenching to be glassy so as to obtain the finished product of the sodium hexametaphosphate. In the method, the sodium chloride which is a low-priced and easily-bought raw material replaces sodium carbonate; moreover, the chlorine hydride is reclaimed so as to lower the production cost. The method has the advantages of short production flow, simple equipment, convenient operation and easy realization of industrialized production, and the P2O5 content in the sodium hexametaphosphate prepared by the method reaches more than 67.5 percent.

Description

A kind of method of producing sodium hexametaphosphate by sodium chloride method

Technical field

The present invention relates to a kind of method of the method for producing Sodium hexametaphosphate 99, particularly a kind of producing sodium hexametaphosphate by sodium chloride method.

Background technology

The method of industrial production Sodium hexametaphosphate 99 has single stage method and two-step approach production technique, and China adopts the two-step approach production technique at present.The two-step approach production technique has three kinds: (1) phosphoric anhydride method, (2) SODIUM PHOSPHATE, MONOBASIC method, (3) ferrophosphorus method.What major part six was wilfully produced producer's employing now is second method, i.e. the SODIUM PHOSPHATE, MONOBASIC method.This method is to be raw material with soda ash (being yellow soda ash) and phosphoric acid, obtains finished product by neutralization, dehydration, polymerization.The technical process of this method is simple relatively, workable, and the quality product of producing is also more stable.But production cost is subjected to the influence of starting material soda ash price bigger.

Summary of the invention

Purpose of the present invention is exactly the method that a kind of producing sodium hexametaphosphate by sodium chloride method will be provided, and adopts starting material sodium-chlor cheap and easy to get to replace soda ash and carries out the production of Sodium hexametaphosphate 99, and this is simple for process.

The object of the present invention is achieved like this: a kind of method of producing sodium hexametaphosphate by sodium chloride method, with sodium-chlor and phosphoric acid in molar ratio the amount of 1:1 mix, melt polymerization under 650 ℃ of-700 ℃ of temperature, the time of melt polymerization kept 30 minutes at least, hydrogenchloride is removed fully, with resultant quenching glassing, promptly get the Sodium hexametaphosphate 99 finished product then.

The present invention replaces yellow soda ash with sodium-chlor, and sodium-chlor is a kind of starting material cheap and easy to get, simultaneously, the also recyclable hydrogenchloride of the present invention, thus can reduce production costs.Production Flow Chart of the present invention is short, and equipment is simple, is convenient to operation, is easy to realize suitability for industrialized production, with the Sodium hexametaphosphate 99 that the present invention makes, P ₂O ₅Content can reach more than 67.5%.

Sodium Hexametaphosphate

Embodiment

Specific implementation process of the present invention is as follows:

With sodium-chlor and phosphoric acid in molar ratio the amount of 1:1 mix, melt polymerization under 650 ℃ of-700 ℃ of temperature, the time of melt polymerization kept 30 minutes at least, and hydrogenchloride is removed fully, with resultant quenching glassing, promptly got the Sodium hexametaphosphate 99 finished product then.

In above-mentioned reaction, the usage ratio of sodium-chlor and phosphoric acid is 1:1, and its temperature of reaction can be controlled in 650 ℃-700 ℃, when temperature is crossed when low, reaction not exclusively, temperature is too high then can to cause energy dissipation.

Shown in the available following reaction formula of the reaction that it carried out:

6NaCl+6H ₃PO ₄→(NaPO ₃) ₆+6HCl+6H ₂O↑

Embodiment 1:

Get 85% phosphatase 79 .85g and sodium-chlor 5.0g and be made into slip, heat gradually in evaporating dish until no hydrochloric acid and overflow, put into retort furnace in 650 ℃ of-700 ℃ of melt polymerizations 30 minutes, take out the quenching glassing then, fragmentation is Sodium hexametaphosphate 99, contains P ₂O ₅67.7%.

Embodiment 2:

Get 85% phosphatase 11 2.22g and sodium-chlor 6.2g and be made into slip, heat gradually in evaporating dish until no hydrochloric acid and overflow, put into retort furnace in 650 ℃ of-700 ℃ of melt polymerizations 1 hour, take out the quenching glassing then, fragmentation is Sodium hexametaphosphate 99, contains P ₂O ₅68.1%.

Embodiment 3:

Get 85% phosphatase 11 2.22g and sodium-chlor 6.2g and be made into slip, heat gradually in evaporating dish until no hydrochloric acid and overflow, put into retort furnace in 650 ℃ of-700 ℃ of melt polymerizations 2 hours, take out the quenching glassing then, fragmentation is Sodium hexametaphosphate 99, contains P ₂O ₅68.3%.

What is Sodium Hexametaphosphate?

Method for producing sodium hexametaphosphate by sodium chloride method

Method for producing sodium hexametaphosphate by sodium chloride method

Sodium Hexametaphosphate

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