A method for cloud point extraction of fluorescent whitening agent vbl in sewage

A fluorescent whitening agent and extraction technology, applied in the direction of extraction water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of residual intermediate products, incomplete treatment, complicated process, etc., and achieve Protect the environment, achieve resource recycling, and achieve high extraction rates

Active Publication Date: 2019-04-30
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of current fluorescent whitening agent VBL treatment technology, such as high cost, complex process, high energy consumption, incomplete treatment and other intermediate product residues, and provide a process with simpler process flow, lower cost and higher removal rate. Higher and simpler equipment based on the cloud point extraction method of the surfactant Triton X-114 to remove the fluorescent whitening agent in the wastewater and recycle the method of reusing the surfactant

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  • A method for cloud point extraction of fluorescent whitening agent vbl in sewage

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Effect test

Embodiment 1

[0027] (1) The aqueous solution of surfactant Triton X-114 and the wastewater containing fluorescent whitening agent VBL were mixed at a volume ratio of 1:3 to prepare a cloud point extraction system. In the extraction system, the final concentration of VBL was 7.5 mg / L, and the final concentration of Triton X-114 was 0.25%.

[0028] (2) The cloud point extraction system was oscillated and mixed, the pH of the system was adjusted to 6, and the phase separation was allowed to stand at 35 °C for 4 hours.

[0029] (3) After phase separation, the fluorescent whitening agent VBL is extracted to the lower phase, namely the surfactant phase. Dilute the lower phase with water to 1 / 3 of the total volume of the original cloud point extraction system, measure the absorbance of VBL in the diluted solution at 348 nm, and obtain an extraction rate of VBL of 81.53%; then add high chlorine to the diluted solution Sodium perchlorate was mixed evenly, so that the concentration of sodium perchl...

Embodiment 2

[0032] (1) Mix a certain concentration of surfactant Triton X-114 aqueous solution and wastewater containing fluorescent whitening agent VBL at a volume ratio of 1:3 to prepare a cloud point extraction system. In the extraction system, the final concentration of VBL was 25 mg / L, and the final concentration of Triton X-114 was 2.5%.

[0033] (2) The cloud point extraction system was oscillated and mixed, the pH of the system was adjusted to 8, and the phase separation was allowed to stand at 50 °C for 12 hours.

[0034] (3) After phase separation, the fluorescent whitening agent VBL is extracted to the lower phase, namely the surfactant phase. Dilute the lower phase with water to 1 / 3 of the total volume of the cloud point extraction system, measure the absorbance of VBL at 348 nm in the diluted solution, and obtain an extraction rate of VBL of 74.62%; then add perchloric acid to the diluted solution Sodium and mixed evenly, so that the concentration of sodium perchlorate in th...

Embodiment 3

[0037] (1) The aqueous solution of surfactant Triton X-114 and the wastewater containing fluorescent whitening agent VBL were mixed at a volume ratio of 1:3 to prepare a cloud point extraction system. In the extraction system, the final concentration of VBL was 17.5 mg / L, and the final concentration of Triton X-114 was 1%.

[0038] (2) The cloud point extraction system was oscillated and mixed, the pH of the system was adjusted to 7, and the phase separation was allowed to stand at 40 °C for 8 hours.

[0039] (3) After phase separation, the fluorescent whitening agent VBL is extracted to the lower phase, namely the surfactant phase. Dilute the lower phase with water to 1 / 3 of the total volume of the original cloud point extraction system, measure the absorbance of VBL at 348 nm in the diluted solution, and obtain the extraction rate of VBL as 92.26%; then add high chloride to the diluted solution Sodium perchlorate was mixed evenly, so that the concentration of sodium perchlora...

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Abstract

The invention relates to a method of cloud point extraction for a fluorescent whitening agent VBL in sewage and belongs to the technical field of industrial dye wastewater treatment. The method comprises the following steps: firstly, proportionally mixing an aqueous solution of a surfactant triton X-114 with fluorescent whitening agent VBL-containing wastewater to prepare a cloud point extraction system; adjusting pH and then standing for phase separation; after phase separation, i.e., extraction of the VBL to a lower phase, diluting the lower phase and then adding sodium perchlorate thereto for mixing evenly to undergo secondary phase separation with the VBL shifting to an upper phase; and removing the upper phase containing the VBL with the triton X-114 left in the lower phase that may be used to repeatedly treating the VBL in wastewater. The method allows the cloud point extraction of the VBL in wastewater to a surface active phase by means of the thermosensitivity of the surfactant triton X-114 with a VBL extraction yield reaching up to 99.79% and the recovery of the surfactant triton X-114 above 90%.

Description

technical field [0001] The invention belongs to the technical field of industrial dye wastewater treatment, and relates to a method for treating wastewater containing fluorescent whitening agent VBL, in particular to a method for cloud point extraction of fluorescent whitening agent VBL in sewage. Background technique [0002] Fluorescent whitening agent VBL is a typical representative product of bis(triazine amino) type fluorescent whitening agent. Compared with other types of fluorescent whitening agents, fluorescent whitening agent VBL has great advantages in terms of price, performance, and application range, and its output and consumption rank first among bis(triazineamino) fluorescent whitening agents. Widely used in the paper industry for whitening of pulp or coatings, whitening of cotton and viscose products, and brightening of light-colored or printed products. However, a large amount of industrial wastewater containing fluorescent whitening agent VBL is discharged...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F101/38
CPCC02F1/26C02F2101/308C02F2101/38C02F2305/04
Inventor 韩娟王赟李媛媛吴嘉聪倪良唐旭张文莉
Owner JIANGSU UNIV
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