Negative-pressure single-furnace single-tower industrial naphthalene rectification system and process

The invention relates to the technical field of metallurgical coking industrial naphthalene rectification, in particular to a negative-pressure single-furnace single-tower industrial naphthalene rectification system and process. The system comprises an industrial naphthalene rectifying tower which is divided into an upper section, a middle section and a lower section, wherein the lower section is a distillation section, the middle section is a carbolic oil oil-water separation section, and the upper section is a carbolic oil condensation section; and the tower top of the carbolic oil condensation section is connected with a vacuum tail gas delivery pipeline, and a vacuum cooler and a vacuum pump are sequentially arranged on the vacuum tail gas delivery pipeline. The industrial naphthalene rectifying tower is changed into negative pressure operation, so that the temperature of the whole process flow is reduced, and a good energy-saving effect is achieved; according to the invention, the problems that the washe