Manufacturing Method of Industrial Sodium Hexametaphosphate
I. Introduction
Sodium hexametaphosphate (SPP) is an important raw material for the production of chemicals, which is widely used in many fields, such as food, detergent, ceramics, water treatment and so on. In industry, there are two main manufacturing methods of sodium hexametaphosphate, wet and dry. This article will introduce these two manufacturing methods in detail.
2. Wet manufacturing
Wet manufacturing of sodium hexametaphosphate mainly includes the following steps:
1. Dosing: phosphoric acid, sodium hydroxide and water according to a certain proportion of dosing.
2. Reaction: the reaction is carried out in a wet process.
2. Reaction: In the reaction kettle, the ingredients are reacted under a certain temperature and pressure to generate sodium metaphosphate.
3. Polymerization: the reaction of sodium metaphosphate is carried out in the polymerization kettle to produce sodium hexametaphosphate.
4. Crystallization: The solution after the polymerization reaction is cooled and crystallized to obtain sodium hexametaphosphate crystals.
5. Separation: Separate the crystals from the mother liquor by centrifugation or filtration.
6. Drying: The separated crystals are dried to obtain the finished product of sodium hexametaphosphate.
The advantage of wet manufacturing is that the product is of high purity and good quality, and is suitable for large-scale production. However, the energy consumption of this method is high, and the production process will produce a large amount of wastewater and exhaust gas, which has a certain impact on the environment.
Third, dry manufacturing
Dry manufacturing of sodium hexametaphosphate mainly includes the following steps:
1. Dosing: the phosphoric acid, sodium hydroxide and a certain amount of water dosing.
2. Reaction: React the ingredients in the reactor to produce sodium metaphosphate.
3. Dewatering: The sodium metaphosphate generated from the reaction is dehydrated to obtain dry sodium metaphosphate powder.
4. Polymerization: The dried sodium metaphosphate powder is polymerized at high temperature to produce sodium hexametaphosphate.
5. Crushing: The polymerized sodium hexametaphosphate is crushed to obtain the finished sodium hexametaphosphate powder.
The advantages of dry manufacturing are simple production process, lower energy consumption, and the production process produces less wastewater waste gas, 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.
IV.Conclusion
There are two main manufacturing methods of industrial sodium hexametaphosphate, wet method and dry method. Wet manufacturing method has high purity and good quality, but high energy consumption and certain impact on the environment; dry manufacturing method has 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, the future research direction can focus on improving the production process, improving product purity and quality.
