Method of drying biodegradable polymers
A technology for degrading polymers and polymers. It is used in the drying of solid materials, the removal of solid wastes, and heating to dry solid materials. It can solve problems such as molecular weight reduction.
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Embodiment I
[0062] Biomass was dried using a low microwave power level (10%)
[0063] According to our protocol, biomass containing PHBV (93% hydroxybutyrate-7% hydroxyvalerate) was prepared in the laboratory. During drying, a Sylvania microwave oven (SM81004, 1 cubic foot volume, 1600W power consumption and 1100W maximum microwave power) was used. 82.2 g of biomass were placed in a microwave oven, dried at 10% power level for a short time (2 minutes), then removed from the microwave, mixed and weighed. Repeat these steps until a constant sample weight is obtained. Short-term microwave exposure is required to avoid spillage of the solution. The biomass was mixed after each short-term microwave irradiation, thereby obtaining a uniform drying of the samples. Under these microwave conditions, 52 minutes were required to dry 82.2 g of biomass containing 46.5% w / w water ( figure 1 ).
Embodiment II
[0065] Dry PHBV emulsions with a low microwave power level (10%)
[0066] During drying, an emulsion containing PHBV (93% hydroxybutyrate-7% hydroxyvalerate) was used. The emulsion contained 15% w / w PHBV in water.
[0067] During drying, a Sylvania microwave oven (SM81004, 1 cubic foot volume, 1600W power consumption and 1100W maximum microwave power) was used. 18.49 g of the PHBV emulsion were placed in a microwave oven, dried at 10% power level for a short time (2 minutes), then removed from the microwave, mixed and weighed. Repeat these steps until a constant sample weight is obtained.
[0068] Short-term microwave exposure is required to avoid spillage of the solution. The biomass was mixed after each short-term microwave irradiation, thereby obtaining a uniform drying of the samples. To confirm the effect of microwave power level on the efficiency of the drying process, samples were subjected to microwave irradiation for 2 minutes at the maximum microwave power level....
Embodiment III
[0071] Dry PHBV emulsion with high microwave power level (50%)
[0072]In the drying process, an emulsion containing PHBV (93% hydroxybutyrate-7% hydroxyvalerate) was used. The emulsion contained 15% w / w PHBV in water.
[0073] During drying, a Sylvania microwave oven (SM81004, 1 cubic foot volume, 1600W power consumption and 1100W maximum microwave power) was used. 23.09 g of the PHBV emulsion were placed in a microwave oven, dried at 50% power level for a short time (30 seconds to 2 minutes), then removed from the microwave, mixed and weighed. If the microwave drying process is performed at a power level higher than 10%, it is necessary to reduce the microwave irradiation time (minutes to seconds) to avoid overflow of the solution. Repeat these steps until a constant sample weight is obtained. The biomass was mixed after each short-term microwave irradiation, thereby obtaining a uniform drying of the samples. Under these microwave conditions, it took 40 minutes to dry th...
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