首页|Fluidized bed poly(methyl methacrylate) thermolysis to methyl methacrylate followed by catalytic hydrolysis to methacrylic acid
Fluidized bed poly(methyl methacrylate) thermolysis to methyl methacrylate followed by catalytic hydrolysis to methacrylic acid
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NSTL
Elsevier
Reprocessing end-of-life polymethyl methacrylate (PMMA) in fluidized beds substitutes fossil fuels as a feedstock for methacrylic acid (MAA). Impurities and high operating and separation costs thwarted the commercialization of the simpler thermolysis PMMA to methyl methacrylate process. In a thermogravimetric analyzer, < 6% of the PMMA decomposed at 230 ?, whereas it all reacted at 350?. In a 13 mm diameter micro-fluidized bed, all the PMMA reacted within 10 min at 350? while at 230? <= 30% reacted. Catalysts like gamma-A(2)O(3), FCC, MoO3-ZrO2/SiO2, zeolite Y, and CsxH(3)-xPW12O40/SiO2 hydrolyze MMA to MAA. The maximum MAA yield was less than 8% for gamma-A(2)O(3), FCC, MoO3-ZrO2/SiO2, while it reached 20% for the Cs heteropoly acid over SiO2 at 280 ?C and exceeded 30% with zeolite Y. Coking on the catalyst and product decomposition along the reactor wall reduced MAA yield. A tandem reactor configuration-thermolysis followed by hydrolysis-will maximize MAA yield.
NSTL
Elsevier
