摘要 |
PROBLEM TO BE SOLVED: To provide a method for purifying ammonia, in which high-purity ammonia can be obtained by using a minimum number of impurity removal means while suppressing an equipment cost or a running cost.SOLUTION: The method for purifying ammonia comprises: a liquid sampling step of sampling crude ammonia as liquid ammonia; a first oil content removing step of introducing the sampled liquid ammonia into a liquid-phase filter to remove the oil content thereof; a vaporizing step of vaporizing the liquid ammonia, the oil content of which is removed at the first oil content removing step, in a vaporizer; a pressure adjusting step of adjusting the pressure of the vaporized ammonia gas to a preset pressure; a second oil content removing step of removing the oil content, which is not removed at the first oil content removing step and remains in the vaporized ammonia gas, by using a gas-phase filter; and a water content removing step of removing the water content in the ammonia gas by using an adsorbent.SELECTED DRAWING: Figure 1 |