Current Location： Home > News > Chemical Knowledge > Manufacturing method and process flow of industrial sodium hexametaphosphate

[Chemical Knowledge]：Manufacturing method and process flow of industrial sodium hexametaphosphate

Read： 948 Time：20months ago Source：Transform the World with Simplicity

The manufacturing method
of industrial sodium hexametaphosphate
1. Introduction

sodium hexametaphosphate (Polyphosphate, referred to as SPP) is an important chemical raw material, widely used in food, detergent, ceramics, water treatment and other fields. In industry, the manufacturing method of sodium hexametaphosphate is mainly wet and dry. This article will introduce these two manufacturing methods in detail.

2. wet manufacturing

wet manufacturing sodium hexametaphosphate mainly includes the following steps:

1. Ingredients: phosphoric acid, sodium hydroxide and water are proportioned in a certain proportion.
2. Reaction: In the reaction kettle, the ingredients are reacted at a certain temperature and pressure to generate sodium metaphosphate.
3. Polymerization: The sodium metaphosphate generated by the reaction is polymerized in a polymerization kettle to generate sodium hexametaphosphate.
4. Crystallization: The solution after the polymerization reaction was subjected to cooling crystallization to obtain sodium hexametaphosphate crystals.
5. Separation: The crystals are separated from the mother liquor by centrifugation or filtration.
6. Drying: The separated crystals were dried to obtain the finished sodium hexametaphosphate. The advantages of

wet manufacturing are high product purity and good quality, which is suitable for large-scale production. However, the energy consumption of this method is high, and a large amount of waste water and waste gas will be produced in the production process, which has a certain impact on the environment.

3. dry process manufacturing

dry process manufacturing sodium hexametaphosphate mainly includes the following steps:

1. ingredients: phosphoric acid, sodium hydroxide and a certain amount of water ingredients.
2. Reaction: The ingredients are reacted in a reaction kettle to generate sodium metaphosphate.
3. Dehydration: The sodium metaphosphate generated by the reaction is dehydrated to obtain a dry sodium metaphosphate powder.
4. Polymerization: The dried sodium metaphosphate powder is subjected to a polymerization reaction at a high temperature to produce sodium hexametaphosphate.
5. Crushing: The sodium hexametaphosphate after the polymerization reaction is crushed to obtain the finished sodium hexametaphosphate powder. The advantages of

dry manufacturing are simple production process, low energy consumption, less waste water and waste gas generated in the production process, and less impact on the environment. However, the product purity of this method is relatively low, and the quality is slightly inferior to that of wet manufacturing.

4. Conclusion The manufacturing methods of sodium hexametaphosphate in

industry are mainly wet and dry. Wet manufacturing products have high purity and good quality, but the energy consumption is high and has a certain impact on the environment; dry manufacturing has a simple production process and low energy consumption, but the product purity is relatively low. In actual production, the appropriate manufacturing method should be selected according to specific needs and conditions. At the same time, in order to reduce energy consumption and reduce the impact on the environment, future research directions can focus on improving production processes, improving product purity and quality.

Previous： Manufacturing method and process of calcium fluoride

Next： The production and manufacturing method and process of sodium hydrogen sulfide.

News Categories