One-pot-method synthesis process for disperse orange 288

Abstract

The invention relates to a one-pot-method synthesis process for disperse orange 288. The synthesis process comprises the following specific steps: (1) carrying out diazotization: adding p-nitroaniline into a proper volume of water, introducing a certain volume of sulfur trioxide gas into the water, carrying out pulping, adding a proper volume of ice into the pulp so as to cool the pulp to a temperature below 0 DEG C, rapidly adding a proper volume of 30% (mass percent) sodium nitrite solution into the cooled pulp, carrying out heat preservation, carrying out a test by adopting potassium iodide test paper (a reaction ends when the test paper becomes blue), adding a proper volume of aminosulfonic acid into the reacted solution so as to remove superfluous sodium nitrite, and adding a certain volume of OP-10 and Peregal O into the reacted solution; and (2) carrying out coupling. The synthesis process has the beneficial effects that the product, i.e., the disperse orange 288 is prepared through taking p-nitroaniline as a raw material, subjecting sulfur trioxide and sodium nitrite to a diazotization reaction and carrying out one-pot-method coupling with N-cyanoethyl-N-benzylaniline, the process operation is simple and convenient, the product is high in yield and high in purity, and the volume of waste gases, waste water and waste residues is small, so that environment-friendly and clean production is achieved.

Description

technical field [0001] The invention relates to a one-pot synthesis process of disperse orange 288, which belongs to the technical field of azo-type disperse dye synthesis. Background technique [0002] Azo-type disperse dyes have bright color and strong tinting strength, and are the most widely used dyes in industry. Azo pigments are mainly three colors of red, orange and yellow, accounting for more than half of the total output of organic dye pigments. While the production of my country's organic pigment industry is developing rapidly, there are also many problems. For example, most enterprises still adopt traditional and backward production techniques in production, and the discharge of waste water and exhaust gas seriously damages the surrounding environment of pigment factories. For example, hydrochloric acid is used in the synthesis of Disperse Orange 288, which is highly corrosive to equipment and seriously pollutes the environment. These have seriously restricted t...

AI Technical Summary

Problems solved by technology

For example, most enterprises still adopt traditional and backward production techniques in production, and the discharge of waste water and exhaust gas seriously damages the surrounding environment of pigment factories. For example, hydrochloric acid is used in the synthesis of Disperse Orange 288, which is highly corrosive to equipment and seriously pollutes the environment. These have seriously restricted the sustainable development of the industry in the future

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