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[Chemical Knowledge]：Manufacturing method and process flow of ammonium carbonate

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The manufacturing method
of ammonium carbonate
1. Introduction

Ammonium carbonate is an important inorganic chemical product, which is widely used in chemical fertilizer, glass, ceramics, printing and dyeing, medicine and other fields. This paper will introduce the manufacturing method of ammonium carbonate in detail, including raw material preparation, reaction process, post-treatment and product quality control.

2. Raw material preparation

1. Ammonia: industrial grade ammonia water with a concentration of about 25%.
2. Ammonium bicarbonate: industrial grade ammonium bicarbonate with purity ≥ 98%.

3. reaction process

The manufacture of ammonium carbonate is mainly completed through the following chemical reactions:

NH3 + CO2 + H2O → NH4HCO3

2NH4HCO3 → (NH4)2CO3 + CO2 + H2O

The specific operation steps are as follows:

1. Add ammonia water into the reactor, turn on the stirrer, and maintain a proper stirring speed.
2. The ammonium bicarbonate solution is introduced through a pipeline while controlling the reaction temperature, generally in the range of 50-60°C.
3. The pH value is continuously monitored during the reaction. When the pH value reaches a predetermined value, the ammonium bicarbonate solution is stopped.
4. Continue stirring for a period of time to complete the reaction.

4. Post-treatment

1. Filtration: After the reaction, impurities and insoluble materials were removed by filtration.
2. Crystallization: The filtrate is cooled to a suitable temperature to precipitate ammonium carbonate crystals.
3. Centrifugation: The crystals were separated from the mother liquor by means of a centrifuge.
4. Drying: Place the crystals in a drying device, and control the temperature and time to obtain a dry ammonium carbonate product.

5. Product Quality Control

In order to ensure the quality of ammonium carbonate products, the following indicators need to be tested:

1. Purity: The purity of ammonium carbonate is determined by chemical analysis methods to ensure that the purity of the product is ≥ 98%.
2. Particle size: Detect the particle size distribution of the product to meet the requirements of different application fields.
3. Water insoluble matter: Determine the content of insoluble matter in the product to ensure the purity of the product.
4. pH: Test the pH of the product to ensure that it has the appropriate pH during application.

6. environmental protection and safety measures

1. Waste gas treatment: the waste gas generated in the production process is purified to ensure that its emissions meet national standards.
2. Wastewater treatment: the wastewater produced in the production process is pretreated and then sent to the sewage treatment station for treatment to ensure that the wastewater meets the discharge standard.
3. Operation safety: strictly abide by the operation procedures to ensure the safety of employees in the production process. Conduct regular training for operators to improve safety awareness.
4. Equipment maintenance: regularly maintain and maintain the production equipment to ensure the normal operation of the equipment and reduce the failure rate.

7. conclusion The manufacturing method of

ammonium carbonate involves many links, including raw material preparation, reaction process, post-treatment and product quality control. In order to ensure product quality and environmental protection and safety, it is necessary to strictly abide by the operating procedures, strengthen quality control and environmental protection treatment. Through the manufacturing method introduced in this paper, high-quality ammonium carbonate products can be produced to meet the needs of different fields.

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