Method for synthesizing adiponitrile through adipic acid liquid-phase ammoniation and high-temperature dehydration

The invention belongs to the technical field of chemical processes, and particularly relates to a method for synthesizing adiponitrile through adipic acid liquid-phase ammoniation and high-temperaturedehydration. The method comprises the following steps: (1) proportioning raw materials; (2) adding the proportioned adipic acid and water into a neutralization reactor, uniformly stirring and mixing,and carrying out neutralization reaction under the condition of ammonia gas until the pH value is stable; (3) separating out a solid adipic acid diammonium salt through a solid-liquid separator; adding the solid adipic acid diammonium salt into a heating melting device for high-temperature melting to obtain a liquid, adding proportioned phosphoric acid and/or a phosphate, then feeding an obtainedproduct into a falling film reactor for dehydration, and then condensing to separate out an organic phase of an adiponitrile crude product; and (4) proportionally mixing the adiponitrile crude product with an azeotropic agent