Method for removing nitrogen in nitric oxide

The invention discloses a method for removing nitrogen in nitric oxide, which is characterized in that an N2-containing NO product is at least subjected to first-stage liquefaction, second-stage liquefaction, first-stage solidification and second-stage solidification under a vacuumizing condition, in the process, NO is at least subjected to two times of liquefaction-gasification and then solidification-gasification-solidification under the action of low temperature so as to be enriched, N2 is always in a gas state, and the N2 is in a gas state. And the N2 is continuously pumped away by the vacuum pump, so that the aim of removing N2 is fulfilled. In the process of slowly liquefying and solidifying NO, N2 in the NO is removed in a vacuumizing mode, the situation that N2 is mingled among solid NO molecules, the purity of the NO is affected is avoided, the flowing or boiling state of liquid NO is also avoided, and the safety is greatly improved. 本发明公开了一种去除一氧化氮中氮气的方法，在抽真空条件下，使含有N2的NO产品至少经过一级液化、二级液化、一级固化、二级固化，在该过程