Recovery method of alkali-washable disperse dye hydrolysate

A technology of disperse dyes and hydrolyzate, applied in the direction of organic dyes, water pollutants, azo dyes, etc., can solve the problem of large acid consumption, and achieve the effect of cost saving

Active Publication Date: 2020-11-24
浙江理工大学上虞工业技术研究院有限公司 +1
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  • 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 hydrolysate
  • Recovery method of alkali-washable disperse dye hydrolysate
  • Recovery method of alkali-washable disperse dye hydrolysate

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Effect test

Embodiment 1-1

[0055] Embodiment 1-1, a method for recovering the hydrolyzate of alkali-washable disperse dyes, for the cloth sample (fabric) dyed with red 1 dye, carry out alkaline washing solution obtained by alkali washing in 0.1g / L NaOH aqueous solution; after testing Calculate, in this alkaline washing solution, the molar concentration of the carboxylate dye as hydrolysis product is 2.9mmol / L.

[0056] The carboxylate dye formed after the red 1 dye is washed with alkali is

[0057] Add different amounts of calcium chloride saturated solution to the alkali washing solution, so that the molar ratio of calcium chloride: carboxylate dye is 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, after fully stirring for 1 hour, let stand for 24 hours. The recovery curve of carboxylate dye precipitation in different molar ratios, such as figure 2 shown.

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

Embodiment 1-2

[0060] Embodiment 1-2, the concentration of NaOH in the NaOH aqueous solution is changed into 1g / L; The molar concentration of carboxylate dyestuff is controlled as 2.9mmol / L in the alkali washing liquid; All the other are equal to embodiment 1-1; When calcium chloride The molar ratio with carboxylate dye reaches 2:1, and the recovery rate reaches 91.7%.

Embodiment 2-1

[0061] Embodiment 2-1, a method for recovering alkali-washable disperse dye hydrolyzed dyes, the alkali washing solution obtained by alkali washing the cloth samples dyed with orange 1 dye in 0.1g / L NaOH aqueous solution; after detection and calculation, the In the alkaline washing solution, the molar concentration of the carboxylate dye as the hydrolysis product is 3.2mmol / L.

[0062] Carboxylate dyes formed after alkaline washing

[0063]

[0064] Add different amounts of calcium chloride saturated solution to the alkali washing solution, so that the molar ratio of calcium chloride: carboxylate dye is 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, after fully stirring for 1 hour, let stand for 24 hours. The recovery curve of carboxylate dye precipitation in different molar ratios, such as image 3 shown.

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

[...

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Abstract

The invention discloses a recovery method of alkaline-washable disperse dye hydrolysate. The method comprises the following steps: performing alkaline washing on a fabric dyed by alkaline-washable disperse dye in a 0.1-1g/L NaOH aqueous solution to obtain an alkaline washing liquid, wherein the alkaline washing liquid contains hydrolysate-carboxylate dye formed by hydrolyzing the alkaline-washabledisperse dye; adding a calcium chloride saturated solution into the alkaline washing liquid until the molar ratio of calcium chloride to carboxylate dye is (2-6):1; after uniformly stirring, performing standing for 24+/-2 hours; and performing filtering to obtain a filtrate, namely an alkali washing solution obtained by recovering the hydrolysis product of the alkaline-washable disperse dye. Thecarboxylate dye is recovered by adopting salting-out instead of acid precipitation, so that a large amount of acid is prevented from being used for neutralizing an alkali washing solution, and the cost is saved.

Description

technical field [0001] The invention relates to a method for recovering 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 type of disperse dyes, and their advantages are simple synthesis, good color development and low cost. Due to the low solubility of disperse dyes in water, the fibers need to be suspended in the water system with the help of dispersants to dye the fibers, and some dye aggregates are adsorbed on the surface of the fibers during the dyeing process to form floating colors. Dye floating not only affects the vividness of the fabric, but also reduces its color fastness. Therefore, after the polyester fabric is dyed, it is usually necessary to remove...

Claims

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Application Information

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Patent Type & Authority Applications(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
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