[Soda ash knowledge] Daily question (148) 2010.3.10
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Write the basic reaction equation of carbonation in the ammonia-alkali method and describe the process. Please hide the reply. If you do not hide it, no score will be given in principle. Edited posts will not be scored. Specific hiding methods: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2 %D8 The title of this issue is taken from the electronic version of the book "Technical Workers Job Training Question Bank-Soda Ash Production Operator": http://bbs.hcbbs.com/thread-13140-1-2.html
NaCl+NH3+CO2+H2O---NaHCO3 (precipitation)+NH4Cl The main process is: 1. The carbon dioxide in the gas phase diffuses through the gas film and enters the gas-liquid interface. ； 2. Carbon dioxide dissolves in the liquid film ； 3. The ammonia carbamate and ammonium bicarbonate generated in the liquid film pass through the liquid film and enter the liquid phase body. ； 4. In the liquid phase body, the NH3 released by the hydrolysis of ammonia carbamate diffuses back from the liquid phase body to the gas-liquid phase to absorb CO2, while HCO3 remains in the liquid phase body.
Write the basic reaction equation of carbonation in the ammonia-alkali method and describe its process.: NaCl+NH3+CO2+H2O→NaHCO3↓+NH4Cl The main process is: ①Carbon dioxide in the gas phase body diffuses through the gas film and enters the gas-liquid two-phase interface; ②Carbon dioxide dissolves in the liquid film ； ③The ammonium carbamate and ammonium bicarbonate generated in the liquid film pass through the liquid film and enter the liquid phase body. ； ④In the liquid phase body, the NH3 released by hydrolysis of ammonium carbamate diffuses back from the liquid phase body to the gas-liquid phase to absorb CO2, while HCO3 remains in the liquid phase body.
Write the basic reaction equation of carbonation in the ammonia-alkali method and describe its process.: NACL+NH3+CO2+H2O----NAHCO3+NH4CL The main process is: 1) Carbon dioxide in the gas phase diffuses through the gas film and enters the vapor-liquid interface ； 2) Carbon dioxide enters the gas film ； 3) The ammonium carbamate and ammonium bicarbonate generated in the liquid film pass through the liquid film and enter the liquid phase body. ； 4) In the liquid phase body, the NH3 released by hydrolysis of ammonium carbamate diffuses back from the liquid phase body to the CO2 absorbed by both the vapor and liquid phases, while HCO3 remains in the liquid phase body.
NaCl+NH3+CO2+H2O→NaHCO3↓+NH4CL The main process is: 1. The carbon dioxide in the gas phase diffuses through the gas film and enters the gas-liquid two-phase interface. ； 2. Carbon dioxide is integrated into the liquid film ； 3. The ammonium carbamate and ammonium bicarbonate generated in the liquid film pass through the liquid film and enter the liquid phase body. ； In the liquid phase body, the NH3 released by hydrolysis of ammonium carbamate diffuses back from the liquid phase body to the gas-liquid phase to absorb CO2, while HCO3 remains in the liquid phase body.
NaCl+NH3+CO2+H2O-NaHCO3+NH4Cl The main process is: 1. The carbon dioxide in the gas phase body diffuses through the gas film and enters the gas-liquid two-phase interface. 2. The carbon dioxide dissolves in the liquid film. 3. The ammonium carbamate and ammonium bicarbonate generated in the liquid film pass through the liquid film and enter the liquid phase body. 4. In the liquid phase body, the ammonia released by the hydrolysis of ammonium carbamate is back-diffused by the liquid phase body to the gas-liquid two-phase to absorb CO2, while HCO3 remains in the liquid phase body.
NaCL+NH3+CO2+H2O—NaHCO3+NH4CL The main process is: 1． Carbon dioxide in the gas phase bulk diffuses through the gas film and enters the gas-liquid two-phase interface ； 2. carbon dioxide dissolves in liquid film ； 3. The ammonium carbamate and ammonium bicarbonate generated in the solution pass through the liquid membrane and enter the liquid phase body. ； 4. In the liquid phase body, the NH3 released by the hydrolysis of ammonium carbamate diffuses back from the liquid phase to the gas-liquid phase to absorb CO2, while the HCO3 remains in the liquid phase body.
NaCl+NH3+CO2+H2O→ NaHCO3↓+NH4Cl The main process is: 1. The carbon dioxide in the gas phase in this question diffuses through the gas film and enters the gas-liquid two-phase interface. ； 2. Carbon dioxide is dissolved in the liquid film ； 3. Ammonium carbamate and ammonium bicarbonate are generated in the liquid film and pass through the liquid film into the liquid phase body. ； 4. In the liquid phase body, the NH3 released by the hydrolysis of ammonium carbamate diffuses back from the liquid phase body to the gas-liquid phase to absorb CO2, while HCO3 remains in the liquid phase body.
NaCl+NH3+CO2+H2O=NaHCO3↓+NH4Cl The main process is: 1. The carbon dioxide in the gas phase diffuses through the gas film and enters the gas-liquid two-phase interface. ； 2. Carbon dioxide is dissolved in the liquid film ； 3. The ammonium carbamate and ammonium bicarbonate generated in the liquid film pass through the liquid film and enter the liquid phase body. ； 4. In the liquid phase body, the NH3 released by hydrolysis of ammonium carbamate diffuses back from the liquid phase body to the gas-liquid two-phase to absorb CO2, while HCO3 remains in the liquid phase body.
NaCl+NH3+H2O+CO2=NaHCO3↓+NH4Cl Ammonia gas is passed into saturated brine to form ammonia salt solution, and then carbon dioxide is passed in to form sodium bicarbonate precipitate and ammonium chloride solution with low solubility!
NH3 + CO2 + H2O + NaCl = NH4Cl + NaHCO3↓ 2NaHCO3 -Heating → Na2CO3 + CO2↑ + H2O Sodium chloride is added to the waste liquid of the ammonia-alkali process, and carbon dioxide and ammonia gas are introduced into the waste liquid at 30-40°C to make the solution saturated, and then the temperature is lowered to below 10°C. The solubility is greater than sodium chloride, but the solubility is less than sodium chloride at 10°C, and the same ion effect causes ammonium chloride to precipitate from the mother liquor. The mother liquor can be used as the raw material for the next alkali production, and ammonium chloride can also be used as a chemical fertilizer. Evaporate to dryness to obtain sodium carbonate.