References in periodicals archive ?
Urea-to-FAME ratio was the primary determining factor for the separation of unsaturated FAME by urea complexation when comparing with 95% ethanol-to-FAME ratio and crystallization temperature as we can see from the discussion above.
The results showed that the percentage of unsaturated FAME increased considerably compared with the initial FAME mixture some even greater than 98%.
The purity of unsaturated FAME (Y1) and recovery of FAME in NUCF (Y2) were fitted in modified quadratic regression model and linear regression model respectively.
For the purity of unsaturated FAME (Y1) all the linear terms of three variables the square term of urea-to-FAME ratio and the interaction between urea-to-FAME ratio and crystallization temperature were highly significant (pless than 0.
The response surfaces for the purity of unsaturated FAME (Y1) and the recovery of FAME in NUCF (Y2) are shown in Fig.
Urea / FAME (X1)###95% ethanol/FAME (X2)###Crystallization temperature (X3)###Purity (Y1)###Recovery (Y2)
Table-2: Analysis of variance (ANOVA) for the purity of unsaturated FAME (Y1).
Table-3: Analysis of variance (ANOVA) for the recovery of FAME in NUCF (Y2).
Optimal conditions of the experiment to obtain maximum yield meanwhile to maintain the purity of unsaturated FAME greater than 98% (As raw
materials for plasticizer the unsaturated FAME content must be larger than 98%) were determined by ridge analysis.