A method for solvent-free catalytic degradation of polylactic acid
A technology of catalytic degradation and polylactic acid, applied in the field of biodegradable material recycling, can solve the problems of resource waste, achieve efficient degradation treatment, realize high-value utilization, and simple product separation process
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Embodiment 1
[0022] A method for solvent-free catalytic degradation of polylactic acid, comprising the following steps:
[0023] 1) Get 10g of polylactic acid and 0.5g of palladium-carbon catalyst into a 100ml reactor, feed hydrogen to replace the air in the reactor, then feed 4MPa hydrogen, and seal the reactor. Turn on the mechanical stirring and control the stirring speed to 500RPM, then raise the temperature to 270°C at a rate of 6°C / min, and react at 270°C for 12 hours.
[0024] 2) Step 1) After the reaction is completed, cool to room temperature, then open the reaction vessel, collect samples, and separate the residual solid and palladium-carbon catalyst by centrifugation to obtain a liquid product, which is transparent.
[0025] The liquid product was dissolved in dichloromethane solvent, and an internal standard (cyclohexanol) was added, and the liquid product component and content were determined by GC-FID analysis (see figure 1 ), wherein ethyl lactate, ethyl propionate, ethanol...
Embodiment 2
[0027] A method for solvent-free catalytic degradation of polylactic acid, comprising the following steps:
[0028] 1) Get 10g of polylactic acid and 0.5g of palladium-carbon catalyst into a 100ml reactor, feed hydrogen to replace the air in the reactor, then feed 4MPa hydrogen, and seal the reactor. Turn on the mechanical stirring and control the stirring speed to 500RPM, then raise the temperature to 300°C at a rate of 6°C / min, and react at 300°C for 12 hours.
[0029] 2) Step 1) After the reaction is completed, cool to room temperature, then open the reaction vessel, collect samples, and centrifuge to separate the residual solid and the palladium-carbon catalyst to obtain a liquid product.
[0030] The liquid product was dissolved in dichloromethane solvent, and an internal standard (cyclohexanol) was added, and the liquid product component and content were determined by GC-FID analysis (see figure 1 ), wherein ethyl lactate, ethyl propionate, ethanol and sec-butyl propion...
Embodiment 3
[0032] A method for solvent-free catalytic degradation of polylactic acid, comprising the following steps:
[0033] 1) Get 10g of polylactic acid and 0.5g of palladium-carbon catalyst into a 100ml reactor, feed hydrogen to replace the air in the reactor, then feed 6MPa hydrogen, and seal the reactor. Turn on the mechanical stirring and control the stirring speed to 500RPM, then raise the temperature to 270°C at a heating rate of 6°C / min, and react at 270°C for 48 hours.
[0034] 2) Step 1) After the reaction is completed, cool to room temperature, then open the reaction vessel, collect samples, and centrifuge to separate the residual solid and the palladium-carbon catalyst to obtain a liquid product.
[0035] The liquid product was dissolved in dichloromethane solvent, and an internal standard (cyclohexanol) was added, and the liquid product component and content were determined by GC-FID analysis (see figure 1 ), wherein ethyl lactate, ethyl propionate, ethanol and sec-butyl...
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