Production method for purifying 2,5-di-tert-butyl hydroquinone

Abstract

The present invention discloses a production method of purifying the 2, 5-two t-butyl hydroquinone; the 2, 5-two t-butyl hydroquinone is sent to be dried after being boiled in water with the traditional production method. The present invention is characterized in that the dried materials of the 2, 5-two t-butyl hydroquinone are respectively added with ethanol, phosphoric acid, zinc powder, and then the temperature is raised to be between 60 and 85 Celsius system; the temperature is kept for 30 to 60 minutes; the materials are pressed, filtered, cooled, crystallized, taken and mechanical centrifugally dried; then the materials are boiled in water, taken out and treated by rinsing with the hydrochloric acid of 30 to 36 percent; then the materials are taken out and centrifugal. After being dried by the fluidized bed, the qualified product can be made. The present invention lowers the phosphate and the compositions of insoluble impurities in the product; the content of the t-butyl hydroquinone in the 2, 5-two t-butyl hydroquinone is reduced to be less than or equal to 0.1 percent; the content of the hydroquinone is less than or equal to 0.05 percent; the content of the 2, 5-two t-butyl hydroquinone is as high as 99.5 percent. At the same time, the present invention changes the traditional oven into the fluidized bed for drying the materials, and avoids the defects of the caking, the hard breaking, and the inferior crystal model and so on.

Description

Technical field: [0001] The invention relates to a production method of chemical products, in particular to a production method for purifying 2,5-di-tert-butylhydroquinone. Background technique: [0002] 2,5-Di-tert-butyl hydroquinone is widely used in synthetic rubber, plastics, resin and other industries; it is suitable for natural rubber, synthetic rubber and latex, polyolefin and polyoxymethylene as modified ultraviolet absorbers, etc.; various Rubber-like materials, developing materials, resins, plastics, oils and adhesives, etc. It is a non-toxic, no bad smell, no pollution plastic inhibitor. As an antioxidant, 2,5-di-tert-butylhydroquinone makes unsaturated polyesters have good stability during production and storage. [0003] The traditional production method is: use hydroquinone and tert-butanol as raw materials to dehydrate 2,5-di-tert-butyl hydroquinone under the catalyst of liquid acid, and use a small amount of sodium metabisulfite in water to dehydrate 2,5 -...

AI Technical Summary

Problems solved by technology

[0006] 2. Treat with sodium metabisulfite to increase the anti-oxidation period, and the appearance part will turn yellow;

[0007] 3. The traditional production process uses an oven to dry the material. The material is easy to agglomerate, hard to break, and the crystal shape is not good