Device and method for purifying and separating ammonia-containing tail gas in carbonylation intermediate production process

The invention provides a device and method for purifying and separating ammonia-containing tail gas in the carbonylation intermediate production process, the device sequentially comprises a gas-liquid separation unit, an ammonium bicarbonate trapping unit, a compression separation unit and an ammonia separation unit, the gas-liquid separation unit comprises a condenser and a first gas-liquid separator, the ammonium bicarbonate trapping unit comprises an ammonium bicarbonate trap, and the ammonia separation unit comprises a second gas-liquid separator. The compression separation unit comprises a compressor and a second gas-liquid separator, the ammonia separation unit comprises an ammonia separation tower and a third gas-liquid separator, and liquid phase outlets of the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator are connected to the same pipeline for recycling. Through the arrangement of the ammonium bicarbonate trapping unit and the multi-stage separation un