Ammonium bicarbonate, also known as ammonium bicarbonate, is a widely used nitrogen fertilizer with the characteristics of easy solubility in water and fast fertilizer efficiency. In the field of raw materials for chemical production, the manufacturing methods of ammonium bicarbonate mainly include ammonification, carbonization, and combined alkali production. Below, we will provide a detailed introduction to these three manufacturing methods
1. Ammoniation method
Ammoniation method is the main method for producing ammonium bicarbonate, and its process includes three steps: carbonization, amination, and crystallization
(1) Carbonization: Heating limestone and coal to produce lime and carbon dioxide gas. Lime reacts with water to form calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate precipitate and calcium bicarbonate solution
(2) Ammoniation: A solution of calcium bicarbonate reacts with ammonia water to form ammonium bicarbonate and calcium carbonate precipitates. Calcium carbonate precipitation is removed by filtration, while ammonium bicarbonate solution undergoes crystallization
(3) Crystallization: Ammonium bicarbonate solution crystallizes and precipitates ammonium bicarbonate at lower temperatures. After centrifugation, drying, and other processes, the finished ammonium bicarbonate is obtained
2. Carbonization method
Carbonization method is a method of introducing carbon dioxide gas into concentrated ammonia water, allowing ammonia water to absorb carbon dioxide and generate ammonium bicarbonate. The specific steps are as follows:
(1) Preparation of concentrated ammonia water: Mix liquid ammonia with water to make concentrated ammonia water
(2) Carbonization: Injecting carbon dioxide gas into concentrated ammonia solution, allowing the ammonia solution to absorb carbon dioxide and generate ammonium bicarbonate solution
(3) Crystallization: Ammonium bicarbonate solution crystallizes and precipitates ammonium bicarbonate at a suitable temperature. After centrifugation, drying, and other processes, the finished ammonium bicarbonate is obtained
3. Joint alkali production method
Joint alkali production method is a method that combines the ammonia alkali method and the synthetic ammonia method to produce pure alkali and ammonium bicarbonate simultaneously. The specific steps are as follows:
(1) Preparation of soda ash: Mix salt, limestone, and coal and heat them to generate soda ash and carbon dioxide gas
(2) Absorbing carbon dioxide: Injecting carbon dioxide gas into concentrated ammonia solution to generate ammonium bicarbonate solution
(3) Crystallization: Ammonium bicarbonate solution crystallizes and precipitates ammonium bicarbonate at a suitable temperature. After centrifugation, drying, and other processes, the finished ammonium bicarbonate is obtained. Meanwhile, the mother liquor contains unreacted sodium chloride, which can be recycled
The above are three common methods for manufacturing ammonium bicarbonate, each with its own advantages, disadvantages, and applicability. In actual production, suitable manufacturing methods can be selected based on factors such as raw material sources, production costs, and product quality. At the same time, in order to ensure the quality and yield of ammonium bicarbonate, it is also necessary to pay attention to the following matters:
1 Control raw material quality: Ensure the quality and purity of raw materials, and avoid the impact of impurities on the production process and product quality
2. Control reaction conditions: Reasonably control reaction temperature, pressure, pH value and other conditions to ensure the smooth progress of the reaction and the stability of the product
3. Strengthen equipment maintenance: Regularly inspect and maintain production equipment to ensure its normal operation and extend its service life
4. Strengthen production management: Establish a sound production management system and operating procedures to ensure the standardization and normalization of the production process
In short, the manufacturing method of ammonium bicarbonate needs to be selected and optimized according to the actual situation, while strengthening production management and quality control, in order to improve product quality and production efficiency.
