Decomposition method for sodium phenate of low-temperature coal tar

The invention discloses a decomposition method for sodium phenate of low-temperature coal tar. The decomposition method comprises the following steps of decomposing mixed sodium phenate obtained after alkali treatment of the low-temperature coal tar by a bipolar membrane electrodialysis device consisting of two bipolar membranes and one cationic membrane served as a basic unit; and obtaining a mixed phenol compound by an electrochemistry method, and applying the produced sodium hydroxide to the production of the sodium phenate. According to the decomposition method, the problem that a large amount of acid and alkali waste water is drained in the conventional coal tar treatment technology is effectively solved, and the decomposition method is a green chemical technology.