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Pollution-free preparation process of direct blue 281 dye

A preparation process, pollution-free technology, applied in the direction of azo dyes, organic dyes, monoazo dyes, etc., can solve the problems of increasing product costs, environmental pollution, etc., and achieve the effects of increasing production capacity, reducing production costs, and improving dispersion efficiency

Active Publication Date: 2014-07-30
TIANJIN YADONG CHEM & DYESTUFF FACTORY
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Problems solved by technology

However, a large amount of waste water is produced in the traditional production process of the dye, which will cause serious environmental pollution if discharged without treatment, and the treatment of process waste water will increase the cost of the product

Method used

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  • Pollution-free preparation process of direct blue 281 dye

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Embodiment Construction

[0027] In conjunction with the following embodiments, the following embodiments are illustrative and not restrictive. The following embodiments cannot be used to limit the protection scope of the present invention.

[0028] The raw materials are as follows:

[0029]

[0030] A pollution-free preparation process of direct blue 281 dye, the steps are as follows:

[0031] ⑴ Diazotization of red base B (p-nitro o-methoxyaniline)

[0032] Put 1000L of water in the diazotizer, add red base B and OP-10, beat for 2 hours, add ice to cool to 0-10℃, then add a certain amount of hydrochloric acid, keep the temperature at 8-10℃, add 30wt after 40 minutes % Sodium nitrite solution, control the end point, stir for 1 to 2 hours, the solution is clarified, the solution temperature t=5~8℃, then use 150kg sodium acetate to adjust pH=3~3.5, total volume V=2000L or so, waiting for coupling;

[0033] ⑵Coupling

[0034] Put water (2500L) in the coupling pot, add chromotropic acid (1,8-dihydroxynaphthalene-3,...

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Abstract

The invention relates to a pollution-free preparation process of a direct blue 281 dye. The process comprises the following steps: firstly, dissolving a red base B and OP-10, subsequently adding sodium nitrite for diazotization, further coupling the diazotized red bases B with chromotropic acid at 0-10 DEG C when the pH value is 8.5, and reducing a coupled product by using a glucose solution for coupling, wherein the temperature t is 50-60 DEG C and the pH value is 12.5-13; finally performing spray drying to obtain a finished dye product. Due to the added OP-10 which can be used for remarkably increasing the dissolution speed of the red base B when the red base B is dissolved, the pulping time is effectively shortened, i.e., the time is reduced to be 2 hours from 4 hours, the temperature of the melting point of OP-10 is 68-78 DEG C, the hydroxyl value is 87+5, and because of the unique physical and chemical characteristics, the dispersion velocity of the red base B is remarkably increased, the dispersion efficiency is improved, the whole production time is further shortened, the production efficiency is improved, and the capacity is increased.

Description

Technical field [0001] The present invention belongs to the technical field of dye preparation, and relates to a preparation method of dyes, and specifically provides a pollution-free preparation process of direct blue 281 dye. Direct blue 281 is C.I.281. Background technique [0002] Direct dyes refer to dyes that can be directly dissolved in water and have high directness to cellulose fibers, without the need to use chemical methods to color fibers and other materials. Direct dyes can color protein fibers (such as wool and silk) in weak acid or neutral solutions, and are also used for dyeing cotton, hemp, rayon, and rayon. Complete chromatogram, low price and convenient operation. The disadvantage is that the washing and light fastness is not ideal. [0003] In the traditional production process of direct dyes, processes such as salting out, filtration and concentration are generally carried out; the purpose is to desalinate, remove unreacted raw materials, intermediates and au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/16C09B33/048C09B67/06
Inventor 张超水赵宝忠张宝文王宁宁
Owner TIANJIN YADONG CHEM & DYESTUFF FACTORY
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