Pollution-free preparation of direct blue 281 dye
A direct, dye technology, applied in azo dyes, organic dyes, monoazo dyes, etc., can solve problems such as environmental pollution and increase product cost, and achieve the effect of reducing production cost, increasing production capacity, and simplifying production process
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[0027] Below in conjunction with embodiment, following embodiment is illustrative, not limiting, can not limit protection scope of the present invention with following embodiment.
[0028] Raw material feeding is as follows:
[0029]
[0030] A pollution-free preparation process of direct blue 281 dye, the steps are as follows:
[0031] ⑴Diazotization of red group B (p-nitro-o-methoxyaniline)
[0032] Put 1000L of water in the diazotization pot, add red base B, OP-10, beat for 2 hours, add ice to cool down to 0-10°C, then add a certain amount of hydrochloric acid, keep the temperature at 8-10°C, add 30wt after 40 minutes % sodium nitrite solution, control the end point, stir for 1-2 hours to clarify the solution, the solution temperature t=5-8°C, then use 150kg of sodium acetate to adjust the pH=3-3.5, the total volume V=2000L or so, to be coupled;
[0033] ⑵Coupling
[0034] Put water (2500L) in the coupling pot, add chromotropic acid (1,8-dihydroxynaphthalene-3,6-disul...
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