Pollution-free preparation technology of direct fast scarlet F2G

Abstract

The invention relates to a pollution-free preparation technology of direct fast scarlet F2G, comprising the following implementation steps: firstly, primary condensation is carried out on pulped cyanuric chloride and J-acid under the pH of 4 to 4.5 at the temperature t of 0 DEG C to 5 DEG C; then, the pH is adjusted to 5 to 5.5, the temperature t is adjusted to 40 DEG C to 45 DEG C, and secondary condensation is carried out; and hydrochloric acid and sodium nitrite are added into anisidine-3-sulfonic acid, the mixture after diazotization is coupled with a secondary condensation product, ternary condensation is carried out on the obtained coupling product and diethanolameine to obtain the final product, and direct spray drying is carried out. The invention changes the traditional production technology condition of the direct fast scarlet F2G, omits the procedures of salting out, filter pressing and pulping and adopts a primary pulp direct spray method; zero discharge of industrial wastewater is achieved; compared with the traditional technology, the yield is greatly increased; large numbers of energy sources are saved, and environment pollution is also reduced; and the invention effectively increases the yield and the coloring intensity of dye, simplifies the technology, saves the cost and has very extensive market prospect.

Description

technical field [0001] The invention relates to a production process of a dye, in particular to a pollution-free preparation process of direct sun-fast scarlet F2G. 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 bro...

AI Technical Summary

Problems solved by technology

However, as a typical azo dye, the traditional production process produces a large amount of wastewater, 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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