In anhydrous ammonia production, what is the controlled molar ratio of rich to lean liquid at 1.20~1.40? ? ?
Thread Content
The molar ratio of the rich liquid is controlled at 1.65–1.85, while the molar ratio of the lean liquid is controlled at 1.20–1.40. The adjustment of the rich liquid molar ratio is determined by the amount of rich liquid to be processed; as the molar ratio increases, the set value for the amount of rich liquid to be processed is increased accordingly, and vice versa when the molar ratio decreases. The adjustment of the lean liquid molar ratio is determined by the amount of steam supplied to the desorption tower; as the molar ratio increases, the set value for the steam supply to the desorption tower is increased accordingly, and vice versa when the molar ratio decreases. :@The operating procedures only state that this is the way to do it, but don’t explain why. Could someone with more experience please explain?
Adjusting the MR of the rich liquid means adjusting the circulation volume; if MR is too high, the alkalinity increases, which reduces the efficiency of ammonia removal from the gas, and it also makes it easier for acidic components in the gas to be absorbed； The circulation rate is closely related to steam consumption ； Adjusting the lean liquid MR mainly involves adjusting the steam amount to optimize the desorption effect; steam stripping is used, and more steam leads to a better stripping effect. If the lean liquid MR is too low, too much steam needs to be used ； Additionally, the phosphate concentration is also important.
May I ask for some reference materials on the production of anhydrous ammonia in schools, as well as gas purification in coking?