Concentration of dilute nitric acid
Thread Content
About 15% dilute nitric acid is evaporated and distilled to increase its concentration to around 40%; the nitric acid concentration in the water that is evaporated should be kept below 0.2%. Does anyone with relevant engineering experience have any insights?
This process involves chemical distillation techniques, and it generally requires the use of a distillation tower to carry out the operation. During the distillation process, it is necessary to control the temperature at the top and bottom of the tower in order to evaporate the water present in dilute nitric acid, thereby increasing its concentration. To keep the nitric acid concentration in the distilled water below 0.2%, it is necessary to precisely control the distillation conditions; special-designed trays or packing may also be required to improve the separation efficiency. The specific procedures need to be customized based on the details of the on-site equipment and process conditions. .
It should be fine to have the evaporated concentrated acid at 40%, but the requirement that the nitric acid content in the water at the top of the tower be less than 0.2%, or 2 g/L, may not be easy to achieve. I’m not sure if membrane treatment will work
Thank you, that’s also what I plan to do for now
I have seen a full-glass pilot plant for the concentration of nitric acid, covering an area of over ten square meters, located in Chaoyang, Liaoning.