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

Active Publication Date: 2015-08-26
TIANJIN YADONG CHEM & DYESTUFF FACTORY
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  • Abstract
  • Description
  • Claims
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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 of direct blue 281 dye

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Embodiment Construction

[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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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 invention belongs to the technical field of dye preparation, relates to a preparation method of dye, and specifically provides a pollution-free preparation process of direct blue 281 dye, where direct blue 281 is C.I.281. Background technique [0002] Direct dyes refer to dyes that can be directly dissolved in water, have high directness to cellulose fibers, and do not need to use relevant chemical methods to color fibers and other materials. Direct dyes can color protein fibers (such as wool and silk) in weakly acidic or neutral solutions, and are also used for dyeing cotton, hemp, rayon and rayon. The chromatogram is complete, the price is low, and the operation is convenient. The disadvantage is that the washing and light fastness are not ideal. [0003] In the traditional production process of direct dyes, the process of salting out, filtration and concentration is generally carried out; the purpose is to desalt, remove unreacted raw material...

Claims

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Application Information

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Patent Type & Authority Patents(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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