How to separate ammonia, methanol, and water
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For a mixed liquid of ammonia, methanol, and water, what separation method should be used if one wants to recover methanol and ammonia separately? I seek guidance from experts.
There needs to be information on the content and the processing volume; different routes are applicable for various contents and scales
What are the traffic volume and ratio? Let’s talk about the parameters first
One case: In this scenario, the boiling point of ammonia solution depends on its concentration; for a concentration of 25%, the boiling point is 37.7 °C ； At a concentration of 32%, the boiling point is 24.7 °C, whereas the boiling point of methanol is 64.5 °C. Ammonia water and methanol can first be separated based on their different boiling points——ammonia water from methanol water——and then the ammonia water solution and the methanol water solution can be separated separately. Install an ammonia water separation tower and a methanol aqueous solution separation tower. Ammonia, methanol, and water are separated. Another scenario: these three substances form a triple-phase azeotrope; that is, NH3, CH3OH, and H2O have an azeotopic point, which is lower than the boiling point of any individual substance. Azeotropic distillation should be used for separation.
Molar ratio of ammonia: methanol: water is 6:2:2
Without knowing the concentration ratio, it’s difficult to design the process. The bond between ammonia and water is quite strong; it’s better to extract methanol first, through extraction
In pressure distillation, ammonia is first distilled to obtain liquid ammonia, and then methanol is separated through atmospheric pressure distillation
Hello, distilling three substances together will result in an azeotrope, so purification isn’t possible in this case
First, ammonia water is separated, then methanol is separated, and finally the residue in the reactor is water.