Preparation Method of 8-Hydroxyquinoline Copper

Update:13-12-2018
Summary:

8-hydroxyquinoline Copper is a yellow-green crystalline […]

8-hydroxyquinoline Copper is a yellow-green crystalline powder, odorless, tasteless, non-volatile, non-deliquescent, decomposed and blackened at high temperatures, insoluble in water and most organic solvents. It is mainly used as a bactericidal and antifungal agent; a pesticide and a medicinal synthetic metal corrosion inhibitor; it is used as a bactericide in agriculture, and also as an antifungal agent for ropes, wires, leathers, and vinyl plastics.

The commonly used production method mainly uses o-aminophenol, o-nitrophenol and acrolein as main raw materials to obtain 8-hydroxyquinoline (referred to as o-aminophenol method) by cyclization, neutralization and steam distillation, and then 8-- The complexation reaction of hydroxyquinoline and copper sulfate is carried out to obtain 8-hydroxyquinoline copper. The 8-hydroxyquinoline copper product produced by this method has low purity (about 97%), and the color of the product changes with time, and the quality is unstable. Not applicable to the high-end product market.

The 8-hydroxyquinoline copper prepared by the hydrothermal synthesis method in the prior art has low purity and is usually used in agricultural chemicals as a bactericidal preservative.

The preparation method comprises the following steps: (1) quinoline and fuming sulfuric acid are heated and reacted to obtain quinoline-8-sulfonic acid, and quinoline-8-sulfonic acid is reacted with solid sodium hydroxide to obtain 8-hydroxyquinoline; (2) The sodium hydroxide and the 8-hydroxyquinoline prepared in the step (1) are completely dissolved in water, and anhydrous copper sulfate is added to obtain 8-hydroxyquinoline copper. The method of the invention has high yield, and the prepared 8-hydroxyquinoline copper has high purity, stable product quality and stable color, and is suitable for the high-end product market.

The object of the present invention is to solve the shortcomings of the prior art method for preparing 8-hydroxyquinoline copper, and provide a simple synthesis, low energy consumption, low pollution, high yield and direct synthesis of 8-hydroxyquinoline copper to meet the purity requirements of luminescent materials methods.