Results for biodiesel production from soybean oil and subsequent
methyl lactate production using the mixture of crude glycerol, methanol,
and CaO from biodiesel process are shown in Table 2. The biodiesel
yield and glycerol yield achieved were 88.3 wt.% and 9.3 wt.%, respectively.
The content of glycerol and methanol in the mixture after removing
biodiesel was about 32.3 wt.% and 56.4 wt.%, respectively, resulting
in an ideal methanol-to-glycerol molar ratio of ~5. Therefore, no additional
methanol was added into the mixture for subsequent glycerol
conversion. Before conducting the reaction, a pre-calculated amount
of CuO was added into the mixture to reach the CuO-to-glycerol molar
ratio of 0.2. From Table 2, it can be seen that the glycerol conversion
and PG yield achievedwere similar to those in the case of converting refined
glycerol. The methyl lactate yield achieved was about 54 mol%, slightly higher than that in the case of converting refined glycerol, while
LA yield achieved was lower than that in the case of converting refined
glycerol. However, the total yield of methyl lactate and LA achievedwas
close to those in the case of converting refined glycerol. The similar glycerol
conversion and product yield achieved for converting the mixture
from biodiesel process might be due to the good mixing of reactants
with catalysts. These results confirmed that the mixture of crude glycerol,
CaO, and methanol frombiodiesel production can be directly used as
reactants to produce methyl lactate and PG without separating the catalyst
of CaO, methanol and purifying crude glycerol.
Results for biodiesel production from soybean oil and subsequentmethyl lactate production using the mixture of crude glycerol, methanol,and CaO from biodiesel process are shown in Table 2. The biodieselyield and glycerol yield achieved were 88.3 wt.% and 9.3 wt.%, respectively.The content of glycerol and methanol in the mixture after removingbiodiesel was about 32.3 wt.% and 56.4 wt.%, respectively, resultingin an ideal methanol-to-glycerol molar ratio of ~5. Therefore, no additionalmethanol was added into the mixture for subsequent glycerolconversion. Before conducting the reaction, a pre-calculated amountof CuO was added into the mixture to reach the CuO-to-glycerol molarratio of 0.2. From Table 2, it can be seen that the glycerol conversionand PG yield achievedwere similar to those in the case of converting refinedglycerol. The methyl lactate yield achieved was about 54 mol%, slightly higher than that in the case of converting refined glycerol, whileLA yield achieved was lower than that in the case of converting refinedglycerol. However, the total yield of methyl lactate and LA achievedwasclose to those in the case of converting refined glycerol. The similar glycerolconversion and product yield achieved for converting the mixturefrom biodiesel process might be due to the good mixing of reactantswith catalysts. These results confirmed that the mixture of crude glycerol,CaO, and methanol frombiodiesel production can be directly used asreactants to produce methyl lactate and PG without separating the catalyst
of CaO, methanol and purifying crude glycerol.
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