Process for synthesizing p-bromophenol

Abstract

The invention discloses a process for synthesizing p-bromophenol. The process comprises the following steps of adding a certain amount of phenol and chloroform which serves as a solvent into a four-mouthed flask which is equipped with a stirrer, a thermometer, a dropping funnel and a gas absorption device, and uniformly mixing; starting up the stirrer to start stirring, inserting the thermometer and the dropping funnel into the four-mouthed flask, completely dissolving phenol in chloroform, then controlling the external temperature of the flask to be -5 DEG C or less, starting to dropwise add bromine through the dropping funnel, controlling the dropwise adding speed so as to maintain the internal reaction temperature of the flask to be 9 DEG C or less, and carrying out stirring reaction for a period of time after the dropwise adding process is ended; heating to the temperature of 12-23 DEG C after the reaction is ended, introducing nitrogen gas to completely expel hydrogen bromide gas in the four-mouthed flask, cooling to the temperature of about 6 DEG C, putting 0.14-0.22 g of p-bromophenol crystal with the purity of higher than 99.1% into the four-mouthed flask, taking the p-bromophenol crystal as a seed crystal, starting to precipitate a crude product, stirring for 22 minutes, discharging, and carrying out depressurized suction filtration by using a Buchner funnel; and washing the crude product with chloroform, then drying, and thus obtaining the p-bromophenol product. The process has the advantages of simplicity, fewer steps, easy operation, low cost, and high product quality.

Description

technical field [0001] The invention belongs to the field of chemical technology, in particular to a synthesis process of p-bromophenol. Background technique [0002] The synthesis process of p-bromophenol at least includes basic processes such as washing, drying, cooling, and stirring. In the current synthesis process of p-bromophenol, the process flow is not easy to implement, the separation efficiency is low, the recycling of raw materials cannot be realized, the production process is complicated, and the production efficiency is low. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a synthesis process of p-bromophenol. The present invention not only has simple production process, improves work efficiency, but also realizes the guarantee of product quality. [0004] The synthesis technique of p-bromophenol provided by the invention compri...

AI Technical Summary

Problems solved by technology

In the current synthesis process of p-bromophenol, the process flow is not easy to implement, the separation efficiency is low, the recycling of raw materials cannot be realized, the production process is complicated, and the production efficiency is low