Preparation method of 1-hydroxymethyl benzotriazole

Abstract

The invention discloses a preparation method of 1-hydroxymethyl benzotriazole, which specifically comprises the following steps: mixing benzotriazole, sulfuric acid, water and a paraformaldehyde solution; slowly heating, starting stirring and carrying out heat-insulation reaction; when a white powdery substance is generated, continuously heating until the precipitate is completely dissolved; insulating heat and cooling to room temperature; filtering to obtain white needle-like 1-hydroxyl benzotriazole crystals; and drying to obtain the product. According to the preparation method of 1-hydroxymethyl benzotriazole disclosed by the invention, the synthesis process is relatively simple, the production time and the usage amount of synthesis raw materials are saved, the production efficiency is high, and the product yield is over 98.65%; the 1-hydroxymethyl benzotriazole produced by the method has a good corrosion inhibition effect on copper; and detection shows that the addition of the 1-hydroxymethyl benzotriazole enables the self-corrosion potential of copper to turn negative, the inhibition effect on cathode polarization is enhanced, the charge transfer resistance on the surface of a copper electrode is increased, and thus the corrosion inhibition effect is relatively good.

Description

technical field

[0001] The invention relates to a preparation method of 1-hydroxymethylbenzotriazole, which belongs to the field of compound preparation. Background technique

[0002] Because of its excellent physical and chemical properties, metal copper is widely used in the circulating water system of air-conditioning pipelines. Due to the evaporation of water during the operation of cooling towers and the continuous concentration of impurities, Clˉ, SO 4 2- The gradual increase of plasma concentration will cause corrosion to the copper pipe wall, and in severe cases, it will lead to the paralysis of the circulating water system, directly affecting industrial production and threatening people's lives.

[0003] At present, the industry mostly adopts the method of adding organic corrosion inhibitors such as benzotriazole (BTA) to protect copper materials. However, when BTA is used in an acidic environment or in a low concentration of neutral water, the corrosion inhibitio...