Synthetic method of low-toxicity low-harm environment-friendly solvent green 3

Abstract

The invention relates to a synthesis method of a low-toxicity low-harm environment-friendly solvent green 3, which comprises the following steps: (a) adding N-butylimidazole and acetone into a reaction vessel, slowly dropwise adding bromoethane for reaction, adding sodium tetrafluoroborate for anion exchange, and continuing stirring the reactants to obtain an ionic liquid; (b) adding 1,4-dihydroxyanthraquinone, a 1,4-dihydroxy anthraquinone leuco body and p-toluidine into the ionic liquid, and carrying out condensation reaction to obtain a first mixed solution; and (c) cooling the first mixedsolution, carrying out suction filtration to obtain a filter cake and a filtrate, and carrying out washing post-treatment on the filter cake to obtain the solvent green 3. According to the method, the synthesized ionic liquid is used as a solvent, the condensation reaction is double condensation through model selection of organic cations and anions in the ionic liquid, the product purity is obviously improved to 98% or above, the yield reaches 95% or above, in addition, the ionic liquid can be recycled, the cost is greatly reduced, and the pollutant discharge amount is reduced; the performances of the solvent green 3 dye as shown as follows: the [delta]E is less than 0.5, [delta]C is brilliant, and the pressure value is less than 0.2.

Description

technical field [0001] The invention relates to a synthesis method of a dye, in particular to a synthesis method of low-toxicity, low-hazard and environment-friendly solvent green 3. Background technique [0002] Solvent Green 3 is also known as Oil-Soluble Green 5B and Transparent Green 5B. Its chemical name is 1,4-bis(p-methylanilino)-anthraquinone, its English name is Solvent Green 3, and its molecular formula is C 28 h 22 N 2 o 2 , the molecular weight is 418.49, and the CAS number is 128-80-3. The appearance of this product is blue-black powder, insoluble in water, soluble in organic solvents such as chloroform, benzene, chlorobenzene, xylene, DMF, etc., blue in concentrated sulfuric acid, and blue-green precipitates after dilution with water. The melting point is 213°C. The light fastness in PS can reach grade 7-8, and the heat resistance in PS can reach 300°C. Solvent green 3 is mainly used for the coloring of various resins, as well as the coloring of polyester...

AI Technical Summary

Problems solved by technology

The quality of solvent green 3 products produced by this process is poor, and the reproducibility of color and light is poor. The hue △E>0.5 accounts for about 50% of the total output. Some single-batch products need to be refined by solvents to achieve qualified quality, resulting in waste of resources. and excessive toxic solvents need reclaiming to toluidine, and the on-site environment of the reclaiming process operation is relatively poor, and operator poisoning incidents often occur in industry, and environment has also been polluted simultaneously; Reaction yield is low, is about 86%, and in the reaction process The resulting competitive double condensation and hydrolysis side reactions are not easy to control, affecting the reaction selectivity and thus the product yield

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