Reaction kettle for producing p-hydroxybenzoic acid

The utility model discloses a reaction kettle for producing p-hydroxybenzoic acid, which comprises a kettle body and a delivery pump, the kettle body is provided with a feed port and a discharge port, the discharge port is communicated with a liquid gathering cavity, the discharge port is provided with a discharge valve, the delivery pump is positioned in the liquid gathering cavity, and the delivery pump is communicated with the liquid gathering cavity. An output port of the conveying pump is connected with a liquid conveying pipe which is arranged on the cavity wall of the liquid collecting cavity in a sealing and penetrating manner, and the other end of the liquid conveying pipe is used for being communicated with a decoloring kettle. The utility model aims at further providing the reaction kettle for producing the p-hydroxybenzoic acid, wherein the delivery pump does not need to bear the influence of high temperature in the whole reaction process, and the pump can be prevented from leaking to pollute the