Manufacturing Method of Ammonium Carbonate
I. Introduction
Ammonium carbonate is an important inorganic chemical, which is widely used in fertilizer, glass, ceramics, printing and dyeing, medicine and other fields. In this paper, the manufacturing method of ammonium carbonate will be introduced in detail, including raw material preparation, reaction process, post-treatment and product quality control.
II. Raw material preparation
1. Ammonia: industrial grade ammonia, the concentration is about 25%.
2. Ammonium bicarbonate: industrial grade ammonium bicarbonate, purity ≥98%.
3. Reaction process
The manufacture of ammonium carbonate is mainly accomplished by the following chemical reaction:
NH3 + CO2 + H2O → NH4HCO3
2NH4HCO3 → (NH4)2CO3 + CO2 + H2O
Specific operation steps are as follows:
1. Add ammonia into the reaction kettle, turn on the stirrer, and keep the appropriate stirring speed.
2. Pass the ammonium bicarbonate solution through the pipeline, and at the same time control the reaction temperature, generally within the range of 50-60℃.
3. Continuously monitor the pH value during the reaction process, and stop feeding ammonium bicarbonate solution when the pH value reaches a predetermined value.
4. Continue stirring for some time to make the reaction complete.
4. Post-treatment
1. Filtration: After the reaction, remove impurities and insoluble substances by filtration.
2. Crystallization: The filtrate is cooled to a suitable temperature so that the ammonium carbonate crystallizes and precipitates.
3. Centrifugation: The crystals are separated from the mother liquor by centrifugation.
4. Drying: Place the crystallized body in the drying equipment, control the appropriate temperature and time to get the dried ammonium carbonate product.
V. Product quality control
To ensure the quality of ammonium carbonate products, the following indexes need to be tested:
1. Purity: Determine the purity of ammonium carbonate through chemical analysis methods to ensure that the product purity is ≥98%.
2. Particle size: Test 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 value: Detect the pH value of the product to ensure that it has suitable acidity and alkalinity in the application process.
6. Environmental protection and safety measures
1. Exhaust gas treatment: purify and treat the exhaust gas generated in the production process to ensure that its emission meets the national standards.
2. Wastewater treatment: Pre-treat the wastewater generated in the production process, and then send it to the sewage treatment station for treatment to ensure that the wastewater meets the standard discharge.
3. Operation safety: Strictly follow the operation regulations 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 repair the production equipment to ensure the normal operation of the equipment and reduce the failure rate.
VII.CONCLUSION
The manufacturing method of ammonium carbonate involves several 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 follow the operating procedures and strengthen the 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.
