Separation and detection method of fluorescent whitening agent in expanded polystyrene

Separation and detection method of fluorescent whitening agent in expanded polystyrene

  • CN 105,606,415 B
  • Filed: 12/24/2015
  • Issued: 09/29/2020
  • Est. Priority Date: 12/24/2015
  • Status: Active Grant
First Claim
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1. A method for separating phenylcoumarin fluorescent whitening agent from expanded polystyrene is characterized by at least comprising the following steps:

  • (1) 10g of expanded polystyrene containing 0.05% PEB was pulverized and dissolved in 50mL of dimethyl sulfoxide to obtain a solution containing expanded polystyrene;

    (2) keeping the reaction temperature at 20 ℃

    , adding 10mL of dimethyl sulfoxide solution containing 1mL of chlorosulfonic acid into the solution containing the expanded polystyrene, and introducing nitrogen into the solution at the same time, wherein the reaction time is 30 minutes;

    (3) after the reaction in the step (2) is finished, adding 50mL of distilled water into the solution, violently shaking the solution in a separating funnel for 10min, separating out a water phase, and filtering to obtain a solution of the sulfonated fluorescent whitening agent;

    the sulfonation treatment is carried out under ultrasound;

    after the water phase is collected in the step (3), introducing supercritical CO into the solution2

    The supercritical CO2The processing method comprises the following steps;

    pouring the aqueous phase solution into a supercritical extraction kettle, and introducing supercritical CO at the temperature of 110 ℃ and

    the pressure of 16MPa2Extracting for 20min, filtering, and removing solids to obtain filtrate, namely the sulfonated fluorescent whitening agent.

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