Method for preparing blue reactive dyes

Abstract

The invention discloses a method for preparing blue reactive dyes. The method comprises the following steps: (1) primary condensation reaction, to be specific, taking copper sulfate pentahydrate, ferrous chloride or a mixture of copper sulfate pentahydrate and ferrous chloride as a catalyst, and enabling bromamine acid and M acid to be subjected to the condensation reaction; (2) refining, to be specific, refining all primary condensation compounds; (3) secondary condensation reaction, to be specific, enabling the refined compound and cyanuric chloride to react to obtain secondary condensation compounds; (4) ternary condensation reaction, to be specific, enabling the obtained secondary condensation compounds and aminobenzene sulfonic acid to react to obtain ternary condensation compounds, filtering, spray drying and packaging, so as to obtain the product. The method can synthesize a new blue reactive dye and has the advantages that the cycle of reaction is shortened, the reaction yield is increased, the reaction is more thorough, the reaction process is clean and environmentally-friendly, the sewage quantity is less, and the prepared product has bright colors.

Description

technical field [0001] The invention belongs to the field of reactive dye synthesis, and in particular relates to a method for preparing blue reactive dye. Background technique [0002] Reactive printing dyes have the advantages of many varieties, complete chromatograms, bright colors, and good wet rubbing fastness. The printing process is simple, the color paste is convenient to prepare, and the printing effect is good. It is one of the most widely used dye categories at present. Among the blue products, Blue P-3R (C.I Reactive Blue 49) is the most important variety, but at present, due to the low solubility of this dye, the synthetic shade is not bright enough, and the traditional salting-out process is used for production, which has a large amount of pollutant discharge. The yield is low, which is not conducive to environmental protection. [0003] Mao Faming studied the synthesis of Mars blue P-3R (dye and dyeing), and believed that the catalyst, the ratio of bromine an...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of blue reactive dyes, through the selection of targeted catalysts and some raw materials to solve the problem that the traditional reactive blue P-3R color is not bright enough, the synthesis time is long, the sewage discharge is large, the solubility is small, and the wet friction At the same time, a new dye is provided, which has the advantages of high yield, bright color, short production cycle, small sewage discharge, and good wet rubbing fastness.

Images