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Recovery method of alkali washable disperse dye hydrolyzate

A technology for disperse dyes and hydrolyzates, applied in organic dyes, water pollutants, azo dyes, etc., can solve problems such as large acid consumption and achieve cost-saving effects

Active Publication Date: 2022-08-05
浙江理工大学上虞工业技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acid analysis method needs to adjust the pH 12.4 alkaline solution (corresponding to 1g / L NaOH) to pH 1 with acid, and the molar ratio of the amount of acid added to the hydrolyzed dye exceeds 340:1, which has the disadvantage of large acid consumption

Method used

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  • Recovery method of alkali washable disperse dye hydrolyzate
  • Recovery method of alkali washable disperse dye hydrolyzate
  • Recovery method of alkali washable disperse dye hydrolyzate

Examples

Experimental program
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Effect test

Embodiment 1-1

[0055] Embodiment 1-1, a kind of recovery method of alkali-washable disperse dye hydrolyzate, the alkali wash solution obtained by alkali-washing in 0.1g / L NaOH aqueous solution for the cloth sample (fabric) dyed with red 1 dye; It is calculated that the molar concentration of the carboxylate dye as the hydrolyzate in the alkaline washing solution is 2.9 mmol / L.

[0056] The carboxylate dye formed after alkaline washing of red 1 dye is

[0057] Different amounts of saturated calcium chloride solutions were added to the alkaline washing solution, so that the molar ratios of calcium chloride:carboxylate dye were 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, after fully stirring for 1h, let stand for 24h. Recovery curves for the precipitation of carboxylate dyes with different molar ratios, such as figure 2 shown.

[0058] When the molar ratio of calcium chloride and carboxylate dye reaches 2:1, that is, when the calcium ion concentration is 5.8 mmol / L, the recovery rate reaches 92....

Embodiment 1-2

[0060] Example 1-2, the concentration of NaOH in the NaOH aqueous solution was changed to 1 g / L; the molar concentration of the carboxylate dye in the alkaline washing solution was controlled to be 2.9 mmol / L; the rest were equivalent to Example 1-1; The molar ratio to carboxylate dye reaches 2:1, and the recovery rate reaches 91.7%.

Embodiment 2-1

[0061] Embodiment 2-1. A method for recovering disperse dye hydrolyzed dyes that can be washed with alkali, the alkali washing solution obtained by alkali washing in 0.1g / L NaOH aqueous solution for the cloth sample dyed with orange 1 dye; In the alkaline washing solution, the molar concentration of the carboxylate dye as the hydrolyzate was 3.2 mmol / L.

[0062] Carboxylate dyes formed after alkaline washing

[0063]

[0064] Different amounts of saturated calcium chloride solutions were added to the alkaline washing solution, so that the molar ratios of calcium chloride:carboxylate dye were 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, after fully stirring for 1h, let stand for 24h. Recovery curves for the precipitation of carboxylate dyes with different molar ratios, such as image 3 shown.

[0065] When the molar ratio of calcium chloride and carboxylate dye reaches 2:1, that is, when the calcium ion concentration is 6.4 mmol / L, the recovery rate reaches 91.9%.

[0066] When ...

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Abstract

The invention discloses a method for recovering alkali-washable disperse dye hydrolyzates. For the alkali-washable disperse dye-dyed fabric, the alkali-washing solution obtained by alkali-washing in 0.1-1 g / L NaOH aqueous solution, the alkali-washing solution It contains the hydrolyzed product---carboxylate dye which can be formed after the alkali wash disperse dye is hydrolyzed; add calcium chloride saturated solution to the alkali wash solution until the mole of calcium chloride:carboxylate dye=2~6:1 ratio; after uniform stirring, let stand for (24±2) h; then filter, the obtained filtrate is the alkaline washing liquid after the hydrolyzed product of disperse dyes can be recovered by alkaline washing. The carboxylate dye is recovered by salting out instead of acid precipitation, which can avoid using a large amount of acid to neutralize the alkaline washing solution, thereby saving costs.

Description

technical field [0001] The invention relates to a recovery method for alkali-washable disperse dyes and hydrolyzed dyes. Background technique [0002] Disperse dyes are a class of non-ionic dyes with low water solubility, mainly used for dyeing polyester fibers. In 2018, the global annual output of disperse dyes was about 650,000 tons, accounting for about half of the total output of dyes. [0003] Azo dyes are the most productive class of disperse dyes, and their advantages are simple synthesis, good chromogenic power and low cost. Due to the low solubility of disperse dyes in water, it is necessary to suspend the fibers in the water system with the help of dispersants to dye fibers, and some dye aggregates are adsorbed on the fiber surface to form floating colors during the dyeing process. Dye floating not only affects the brightness of the fabric, but also reduces its color fastness. Therefore, after the polyester fabric is dyed, it is usually necessary to remove the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C245/08C09B29/00C02F1/52C02F101/30C02F101/38
CPCC07C245/08C09B29/00C02F1/5236C02F2101/308C02F2101/38
Inventor 崔志华金亮王刚强何旭斌朱涛顾彩琴
Owner 浙江理工大学上虞工业技术研究院有限公司