Study On The Synthesis And Industrialization Of The Dioxazine Active Dyes

Active dyes are water-soluble dyes with a reactive group, covalent bonding with hydroxy or amino on the fiber in the dyeing process. They have excellent performance in wet fastness and leveling properties, and also have bright color, high brightness and complete chromatography. Triphendioxazine compounds are anthraquinone structure of dioxygen aza, donor-acceptor chromophores with4heteroatoms complex electron. They have strongly nâ†'Ï€*absorption band in the visible region, can be used as chromophores of active dyes, fluorescent dyes, laser dyes, photoelectric conversion dyes and so on. Triphendioxazine active dyes have high bright color, high color values, excellent light fastness, and other characteristics. Its Moorish extinction coefficient is4-7times compared with the anthraquinone, mainly blue variety.Based on the comprehensive study of literature and the analysis of process principle, the synthesis of triphendioxazine active dyes and its application properties were studied in the thesis. Active blue KE-GN was synthesized starting from triphendioxazine matrix and an intermediate which was a condensation product from2,5-disulfonate aniline and cyanuric chloride. In addition, industrial production of the product was also studied.Experiments were carried out to study the reaction temperature, pH, reactant mole ratio on the two condensation reaction. By orthogonal experiments, a optimal reaction condition of the first condensation reaction was obtained as follows:the reaction temperature T=10℃, pH=5.0-5.5, ncyanuric chloride:n2,5-disulfonate aniline=1.15:1; a optimal reaction condition of the second condensation reaction:reaction temperature T=45℃, pH=8.0-8.2, n2,5-disulfonate aniline:nmatrix=2.75:1. The salting-out conditions of products were studied by experimental research. In consideration of the economic benefit and the ease of operation, the optimal purification condition was obtained as follows:T=35℃, pH=6.5, mixture of sodium chloride and potassium chloride when salting-out, dosage5%sodium chloride mass concentration, about5%potassium chloride mass concentration. The application properties of the product were also studied. The product has too large molecule, strong linear and coplanar, which causes it easy to associative, and then make the effective utilization of dye reduce. Therefore, according to customer’s requirements, properly acceding15-20%additives when product standardization, the effective utilization rate of dyes can increase by3-5%.According to the results of experiments, in accordance with the low production cost, easy operation, high quality product and safety production requirements, the thesis determined a reasonable process, designed the production workshop which had annual production capacity of800ton active blue KE-GN, prepared a flow chart, production workshop layout drawings, and so on.According to the results of active blue KE-GN industrialized implementation, the technical and economic feasibility were evaluated, and it provided a good theoretical guidance for the industrialization promotion and process optimization in the future.