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Method for recycling fluorescent whitening agent

A fluorescent whitening agent and whitening agent technology, which is applied in chemical instruments and methods, multi-stage water treatment, water/sludge/sewage treatment, etc., can solve the problems such as the inability to recycle fluorescent whitening agents, and achieve environmental protection, cost saving effect

Pending Publication Date: 2021-06-29
南京旭美化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for effective treatment of polluted waters with residual colored substances (fluorophores) from industrial processes or other sources such as chemical manufacturing plants without damaging their ecosystems. It achieves this through methods like filtrating out contaminants beforehand, treating them chemically, removing impurities, and reusing them afterwards.

Problems solved by technology

The technical issue addressed by this patented method relates to how efficiently recover or dispose of excessive amounts (fluorescence) from industrial processes involving fluorochromes without causing environmental damage due to their disposal on landfill sites after use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]Put the wastewater containing the fluorescent whitening agent into the still, control the reaction temperature to 120°C, and the pressure to 0.2Mpa, add a certain amount of distilled water, stir for 0.5h, heat and evaporate the solvent until the solution is saturated, the evaporation temperature is 85°C, saturated Then stop heating, cool and stand until crystallization, filter the solution to obtain the filtrate and the crude whitening agent, dissolve the crude whitening agent, DMF, activated carbon, and clay into the toluene solution, raise the temperature to 40°C, keep it warm for 10 minutes, and filter out solid impurities , the filtrate was obtained, and the filtrate was passed into the electrocatalytic oxidation device, the reaction time was 0.5h, and the current density in the electrocatalytic oxidation device was controlled at 0.81A / dm 2 After the reaction, add an alkaline reagent to adjust the pH value to 8.5, wherein the ratio of DMF, activated carbon, clay and w...

Embodiment 2

[0068] Put the wastewater containing the fluorescent whitening agent into the distillation kettle, control the reaction temperature to 130°C, and the pressure to 1.2Mpa, add a certain amount of distilled water, stir for 0.8h, heat and evaporate the solvent until the solution is saturated, the evaporation temperature is 90°C, saturated Then stop heating, cool and stand until crystallization, filter the solution to obtain the filtrate and the crude whitening agent, dissolve the crude whitening agent, DMF, activated carbon, and clay into the methanol solution, raise the temperature to 50°C, keep it warm for 40 minutes, and filter out the solid impurities , get the filtrate, pass the filtrate into the electrocatalytic oxidation device, the reaction time is 1.5h, and the current density in the electrocatalytic oxidation device is controlled at 0.9A / dm 2 After the reaction, add an alkaline reagent to adjust the pH value to 9, wherein the ratio of DMF, activated carbon, clay and white...

Embodiment 3

[0072] Put the wastewater containing the fluorescent whitening agent into the still, control the reaction temperature to 140°C, and the pressure to 2.0Mpa, add a certain amount of distilled water, stir for 1 hour, heat and evaporate the solvent until the solution is saturated, the evaporation temperature is 95°C, after saturation Stop heating, cool and stand until crystallization, filter the solution to obtain the filtrate and the crude whitening agent, dissolve the crude whitening agent, DMF, activated carbon, and clay into the dichloromethane solution, raise the temperature to 60°C, keep it warm for 60 minutes, and filter out the solid Impurities, get the filtrate, pass the filtrate into the electrocatalytic oxidation device, the reaction time is 2h, and the current density in the electrocatalytic oxidation device is controlled at 1.00A / dm 2 After the reaction, add an alkaline reagent to adjust the pH value to 10.5, wherein the ratio of DMF, activated carbon, clay and whiteni...

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PUM

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Abstract

The invention discloses a method for recycling a fluorescent whitening agent. The method comprises the following steps: introducing wastewater containing the fluorescent whitening agent into a distillation kettle, and carrying out crude distillation concentration treatment; transferring the water body subjected to distillation concentration treatment into a rectifying still, removing a solvent in the water body until the solution is saturated, cooling, standing and filtering to obtain a crude whitening agent product; dissolving the crude whitening agent product into an organic solvent, introducing into an electrocatalytic oxidation device, reacting for a period of time, and adjusting the pH value of effluent until the effluent is weakly alkaline; heating the reaction liquid, adding PAM for coagulation, precipitating in a precipitation tank, and filtering to obtain a supernatant and sludge; and cooling the supernatant for solid-liquid separation, washing the separated solid with alcohol, then sending the solid into a drying machine, and drying to obtain a solid whitening agent. The recycling method treats the waste water, environment pollution is avoided, the whitening agent is recycled, the cost is saved, two purposes are achieved at a time, and the method is worthy of application and popularization.

Description

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Claims

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Application Information

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Owner 南京旭美化工有限公司