Pollution-free preparation technology of direct rose FR

Abstract

The invention relates to a pollution-free preparation technology of direct rose FR, comprising the following concrete implementation steps: firstly, primary condensation is carried out on pulped cyanuric chloride and H-acid under the pH of 1 to 2 at the temperature t of 0 DEG C to 5 DEG C; then, aniline after diazotization is added into the primary condensation reaction solution for carrying out coupling; a DSD acid solution is added into the coupling product, the pH is adjusted to 8 to 8.5, the temperature t is adjusted to 40 DEG C to 45 DEG C, and secondary condensation is carried out; drewamine is added into the secondary condensation product, the pH are kept at 9 to 9.5 and the temperature t are kept at 95 DEG C to 100 DEG C to carry out ternary condensation; and after the condensation is at end point, direct spray drying is carried out. The technology omits the procedures of salting out, filter pressing and pulping and adopts the direct spray method of primary pulp. 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. 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 pollution-free preparation process of direct rose red FR. 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 in durin...

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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