Direct spray drying preparation technology of direct fast black 22

Abstract

The invention relates to a direct spray drying preparation technology of direct fast black 22. The technology is characterized in that the technology comprises the following implementation steps: firstly, diazotization is carried out on 4, 4-diamino-diphenylamine-2-sulfonic acid, and then the 4, 4-diamino-diphenylamine-2-sulfonic acid is coupled with dissolved r acid under an alkaline condition; after hydrochloric acid and sodium nitrite are added into the primary coupling product for carrying out secondary diazotization, secondary coupling is carried out on the mixture with the pH of 9 to 9.5 and lentine, and the coupling temperature is controlled at t of 10 DEG C to 15 DEG C; and after the reaction is completed, the mixture is delivered to a drying tower for direct spray drying, and then the final product is obtained. In the invention, the traditional production technology condition is changed, the procedures of salting out, filter pressing and pulping are omitted, and the optimized technology directly transfers primary pulp after secondary coupling to the drying tower for spray drying. Zero discharge of industrial wastewater is achieved. Compared with a traditional technology, the yield is greatly increased. The invention effectively increases the yield and the coloring intensity of dye, reduces energy consumption and simplifies the technology; and with steady quality, pollution reduction effect and cheap price, the invention has very strong competitive strength and very extensive market prospect.

Description

technical field [0001] The invention relates to a dye preparation process, in particular to a direct sunfast black 22 direct spray drying preparation process. Background technique [0002] At present, the competition in the direct dye industry is becoming increasingly fierce, and people's requirements for the color of textiles are also increasing, and the requirements for dyes are also getting higher and higher. Environmentally friendly dyes and salt-free liquid dyes with bright colors and high dye uptake are very popular. [0003] In the traditional production process of direct dyes, the process of salting out, filtration and concentration is generally carried out; the purpose is to desalt, remove unreacted raw materials, intermediates and secondary dyes, and remove water to obtain dyes with the required concentration and purity. It is then dried in an oven to make powdered dyes or directly prepared as liquid dyes. Practice has proved that the impurities and salt brought i...

AI Technical Summary

Problems solved by technology

However, a large amount of waste water is produced in the traditional production process of the dye, which will cause serious environmental pollution if discharged without treatment

And the treatment of process wastewater will increase the cost of the product

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