Ammonia Condensation in Ammonium Paratungstate Crystallization Affecting Factors

Condensation of ammonia tail gas from ammonium paratungstate is affected by many factors. Condensing often refers to the physical condensation process of the constant or high temperature gas, liquid cooled down, also reaction produced by polymerization of two or more physical. Studying the law NH3 saluted in water t different temperatures, and adopting appropriate technology and equipment will make a good effect on NH₃ recovery. We analyze from the following 3 factors:
1.    Area ratio of condensation and evaporation (Short for S_c/S_e)
The concentration of ammonia decreased with the increasing of Sc/Se in APT crystallization. In the early evaporation stage, low temperature of the solution, high concentration of ammonia, much NH₃ escaped and small amount of evaporation lead to higher concentration of ammonia; in the latter stages, temperature rising lead to ammonia concentration reduced, and less NH₃ escaped, moisture evaporation, condensation of ammonia declining. When in the right Condensation strength, NH₃ absorbed in water at maximum; the smaller S_c/S_e is disadvantage to absorb ammonia gas; the larger S_c/S_e will increase the condensation amount, resulting in the decrease of the concentration of ammonia.
2.    Evaporation temperature
The saturation water vapor will increased with the evaporation temperature increasing, and the more water condensation will dilute ammonia, so low temperature evaporation is conducive to improve the concentration of ammonia.
3. Stirring speed
Evaporation of H₂O and evaporation are the process of liquid→gas during the APT crystallization, and stirring can promote the concentration of ammonia.

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