yield results obtained using 3 wt% of enzyme at 50 bar and 25 bar were also very similar. The lack of influence of pressure over reac- tion yield may be due to the low compressibility of GLP. For 8 h of reaction 77 wt% of yield was achieved at 25 bar and 73 wt% at 50 bar. A good aspect of using LPG as solvent reaction medium is that it is liquid at pressures down to 25 bar (at 65 ◦ C propane vapor pressure is 23.4 bar and butane vapor pressure is 7.2 bar [21]).
A comparison between the reaction yield results obtained by LPG reactions with those obtained by the production of poly- caprolactone in CO2 [13] is presented in Fig. 4, which shows the yield results obtained for the kinetics of CO2 with 5 wt% of enzyme, 1:2 solvent/monomer ratio, at 120 bar and 65 ◦ C, and the results obtained for the kinetics of LPG with 5 wt% of enzyme, 2:1 solvent/monomer ratio, at 120bar and 65◦C. As observed in Fig. 4, although very similar, the LPG results are higher than those obtained with the use of CO2 with yields up to 81 wt% against 76 wt% for CO2. These results might be a consequence of the LPG positive effect over the enzyme activity [18].
Results in terms of number-average molecular weight (Mn) and weight-average molecular weight (Mw ) for the
yield results obtained using 3 wt% of enzyme at 50 bar and 25 bar were also very similar. The lack of influence of pressure over reac- tion yield may be due to the low compressibility of GLP. For 8 h of reaction 77 wt% of yield was achieved at 25 bar and 73 wt% at 50 bar. A good aspect of using LPG as solvent reaction medium is that it is liquid at pressures down to 25 bar (at 65 ◦ C propane vapor pressure is 23.4 bar and butane vapor pressure is 7.2 bar [21]).
A comparison between the reaction yield results obtained by LPG reactions with those obtained by the production of poly- caprolactone in CO2 [13] is presented in Fig. 4, which shows the yield results obtained for the kinetics of CO2 with 5 wt% of enzyme, 1:2 solvent/monomer ratio, at 120 bar and 65 ◦ C, and the results obtained for the kinetics of LPG with 5 wt% of enzyme, 2:1 solvent/monomer ratio, at 120bar and 65◦C. As observed in Fig. 4, although very similar, the LPG results are higher than those obtained with the use of CO2 with yields up to 81 wt% against 76 wt% for CO2. These results might be a consequence of the LPG positive effect over the enzyme activity [18].
Results in terms of number-average molecular weight (Mn) and weight-average molecular weight (Mw ) for the
การแปล กรุณารอสักครู่..
