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Salt-free dye and preparation method thereof

A salt-free dye and dye technology, applied in the field of dye chemistry, can solve the problems of poor storage stability, easy precipitation hydrolysis reaction, difficulty in removing inorganic salts, etc., and achieve the effect of good storage stability

Active Publication Date: 2017-01-04
YANTAI ANOKY FINE CHEM CO LTD +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects in the prior art that it is difficult to remove inorganic salts in crude dyes, easy to produce precipitation and hydrolysis reactions during storage, and easy to breed bacteria and molds, resulting in poor storage stability, and to provide a salt-free dye and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Reactive Red 218 crude product, wherein: dye reactive red 218 content 71%, sodium sulfate content 3.5%, sodium chloride content 20%, water 5.5%.

[0036] 500kg reactive red 218 crude product was mixed and dissolved with 4500kg deionized water, and ion chromatography was used to detect the sulfate radical content therein. Add 1:1 (molar ratio) of barium chloride, stir to completely dissolve the barium chloride, continue to stir for 3 hours, and then let it stand for 6 hours. It is qualified if the sulfate content is lower than 5ppm.

[0037] The above solution was filtered using a 20 nm ceramic membrane, and the filtrate was collected. The ceramic membrane water is treated as sewage.

[0038] Transfer the filtered filtrate to nanofiltration membrane equipment for desalination (pressure 1MPa), during which pure water is continuously replenished, about 5 times the amount of water in the above filtrate, and ion chromatography is used to check that the chloride ion content ...

Embodiment 2

[0049] Reactive yellow 95 crude product, wherein: the content of dye reactive yellow 95 is 68%, the content of sodium sulfate is 6.2%, the content of sodium chloride is 19.7%, and the content of water is 6.1%.

[0050] 500kg reactive yellow 95 crude product is mixed and dissolved with 1500kg water, and ion chromatography is used to detect the sulfate radical content therein. Add 1:1 (molar ratio) of barium chloride, stir to completely dissolve the barium chloride, continue to stir for 3 hours, then let it stand for 6 hours, and check that the sulfate content is less than 5ppm as qualified.

[0051] The above solution was filtered using a 20 nm ceramic membrane, and the filtrate was collected. The ceramic membrane water is treated as sewage.

[0052] Transfer the filtered filtrate to nanofiltration membrane equipment for desalination (pressure 0.2MPa), during which pure water is continuously replenished, about 3 times the amount of the above filtrate, and ion chromatography is...

Embodiment 3

[0063] Acid blue 86 crude product, wherein: dye acid blue 86 content 55%, sodium sulfate content 11.8%, sodium chloride content 25.7%, moisture 7.5%.

[0064] Mix and dissolve 500kg of acid blue 86 crude product with 7500kg of water, and detect the sulfate content therein by ion chromatography. Add 1:1 (molar ratio) of barium chloride, stir to completely dissolve the barium chloride, continue to stir for 3 hours, and then let it stand for 6 hours. It is qualified if the sulfate content is lower than 5ppm.

[0065] The above solution was filtered using a 50 nm ceramic membrane, and the filtrate was collected. The ceramic membrane water is treated as sewage.

[0066] Transfer the filtered filtrate to nanofiltration membrane equipment for desalination (pressure 1.5MPa), during which pure water is continuously replenished, about 5 times the water volume of the above filtrate, and ion chromatography is used to check that the chloride ion content is less than 5ppm. Then increase t...

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PUM

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Abstract

The invention discloses a salt-free dye and a preparation method thereof. The preparation method of the salt-free dye includes the following steps that divalent salt is removed, wherein a crude dye water solution is mixed with soluble barium salt, the mixture is stirred and reacts, filtration is carried out with a nano ceramic membrane, and dye liquor 1 is obtained; univalent salt is removed, wherein the dye liquor 1 is filtered with a nanofiltration membrane, cyclic desalting is carried out at the temperature of 0.2-1.5 MPa at first, water is supplemented in the period, after it is detected that the content of chlorine ions is smaller than 5 ppm, the pressure is increased to 2.0-2.5 MPa, concentration is carried out, and dye liquor 2 is obtained; the dye liquor 2 is mixed with a co-solvent and a buffer agent, sterilization is carried out, preservative is added, filtration is carried out with a hollow fiber membrane and a nano ceramic membrane, and the salt-free dye is obtained. The pH value buffer range of the buffer agent ranges from 5.0 to 9.0. The prepared salt-free dye is low in content of inorganic salt ions, no hydrolysis or precipitation reaction is generated, and the storage stability of the salt-free dye is good.

Description

technical field [0001] The invention relates to the field of dye chemistry, in particular to a salt-free dye and a preparation method thereof. Background technique [0002] With the development of digital printing technology, the demand for salt-free dyes required for the production of digital inks is increasing. The core of digital salt-free dyes is to remove the inorganic salts in the dyes. During the production of dyes, a large amount of inorganic salts such as sodium sulfate, sodium chloride, and potassium chloride will be produced, and their existence will seriously affect the digital printing machine. The life of the nozzle, so desalination is one of the core tasks in the production of salt-free dyes. At present, nanofiltration desalination has poor ability to remove divalent ions. If this method is only used, the efficiency is very low and a large amount of pure water will be used, which will increase production costs and sewage treatment costs. [0003] In addition...

Claims

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Application Information

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IPC IPC(8): C09B67/54
CPCC09B67/0096
Inventor 冯全明曹文斌刘建
Owner YANTAI ANOKY FINE CHEM CO LTD