Abstract
This work presents the chemical recycling of poly (bisphenol-a carbonate) (PC) pellets with a hydrolysis technique by using concentrated sulfuric acid (H2SO4) as the catalyst in water. The effects of H2SO4 concentration and reaction temperature on the rate of hydrolysis were explored. For that, the values of PC conversion as a function of reaction time were gathered by running PC hydrolysis experiments at H2SO4 concentrations within the range of 10M to 16M and reaction temperatures within the range of 110 to 150 °C. The kinetics of PC hydrolysis were described by considering a pseudo-first-order reaction model, which was consequently applied to calculate specific reaction rate constants. Afterward, the Arrhenius equation was used to determine the overall activation energy of PC hydrolysis. Distillation was used to recover the catalyst (H2SO4) after a PC hydrolysis test so that it is further characterized by titration and reused for PC hydrolysis to study the catalyst reusability. It was shown that H2SO4 can be recovered and reused up to 5 rounds by retaining its acid activity. Also, the effect of hydrolysis on the reduction of PC size was explored. Moreover, a hydrolysis mechanism of polycarbonate by aqueous H2SO4 solution was presented.
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Abbreviations
- BPA:
-
Bisphenol-a
- DMSO-d6:
-
Deuterated dimethyl sulfoxide
- FTIR :
-
Fourier-transform infrared spectroscopy
- 1H NMR :
-
Proton nuclear magnetic resonance
- PC:
-
Poly (bisphenol-a carbonate)
- []:
-
Molar concentration
- %:
-
Weight percentage
- oC :
-
Degree of centigrade
- ρpc :
-
Density of poly (bisphenol-a carbonate)
- A :
-
Pre-exponential order
- CPC :
-
Concentration of poly (bisphenol-a carbonate) at the reaction time t
- CPCi :
-
Concentration of poly (bisphenol-a carbonate) at the initial time (t = 0)
- cm:
-
Centimeter
- Ea :
-
Overall activation energy
- g:
-
Gram
- H2SO4 :
-
Sulfuric acid
- h:
-
Hour
- J:
-
Joule
- Kapp. :
-
Apparent reaction rate constant
- KBr:
-
Potassium bromide
- k:
-
Kilo
- ksp. :
-
Specific reaction rate constant
- Lchar :
-
Characteristic length
- M:
-
Molar
- MWBPA :
-
Molecular weight of bisphenol-a
- MWPC :
-
Molecular weight of poly (bisphenol-a carbonate) unit
- m:
-
Meter
- mm:
-
Millimeter
- mi :
-
Mass of poly (bisphenol-a carbonate) at the initial time (t = 0)
- mL:
-
Milliliter
- mt :
-
Mass of recovered poly (bisphenol-a carbonate) at reaction time t
- \({\mathrm{m}}_{\mathrm{t}}^{\mathrm{^{\prime}}}\) :
-
Mass of produced bisphenol-a at time t
- pH :
-
Potential of hydrogen
- R:
-
Gas constant
- R2 :
-
Linear correlation coefficient
- s:
-
Second
- T:
-
Reaction temperature in Kelvin
- TR :
-
Reaction temperature
- t:
-
Reaction time
- X:
-
Conversion of poly (bisphenol-a carbonate) at the reaction time t
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Abedsoltan, H. Concentrated Sulfuric Acid as a Catalyst for Chemical Recycling of Polycarbonate in Water. Waste Biomass Valor 15, 2793–2806 (2024). https://doi.org/10.1007/s12649-023-02326-x
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DOI: https://doi.org/10.1007/s12649-023-02326-x