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Biodiesel from Citrullus colocynthis oil: sulfonic-ionic liquid-catalyzed esterification of a two-step process.

Ali Elsheikh Y, Hassan Akhtar F - ScientificWorldJournal (2014)

Bottom Line: Based on the results, 3.6 wt% of DSIMHSO4, methanol/CCO molar ratio of 12 : 1, and 150 °C offered a final FFA conversion of 95.4% within 105 min.A 98.2% was produced via second KOH-catalyzed step in 1.0%, 6 : 1 molar ratio, 600 rpm, and 60 °C for 50 min.This new two-step catalyzed process could solve the corrosion and environmental problems associated with the current acidic catalysts.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Materials Engineering, King Abdulaziz University, P.O. Box 344, Rabigh, Saudi Arabia.

ABSTRACT
Biodiesel was prepared from Citrullus colocynthis oil (CCO) via a two-step process. The first esterification step was explored in two ionic liquids (ILs) with 1,3-disulfonic acid imidazolium hydrogen sulfate (DSIMHSO4) and 3-methyl-1-sulfonic acid imidazolium hydrogen sulfate (MSIMHSO4). Both ILs appeared to be good candidates to replace hazardous acidic catalyst due to their exceptional properties. However, the two sulfonic chains existing in DSIMHSO4 were found to increase the acidity to the IL than the single sulfonic chain in MSIMHSO4. Based on the results, 3.6 wt% of DSIMHSO4, methanol/CCO molar ratio of 12 : 1, and 150 °C offered a final FFA conversion of 95.4% within 105 min. A 98.2% was produced via second KOH-catalyzed step in 1.0%, 6 : 1 molar ratio, 600 rpm, and 60 °C for 50 min. This new two-step catalyzed process could solve the corrosion and environmental problems associated with the current acidic catalysts.

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Related in: MedlinePlus

DSC curve for melting point determination of DSIMHSO4.
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Related In: Results  -  Collection


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fig3: DSC curve for melting point determination of DSIMHSO4.

Mentions: The synthesized ionic liquids, DSIMHSO4 and MSIMHSO4, showed melting temperatures at 6 ± 0.2°C and −15 ± 0.2°C, respectively, presented in Figures 3 and 4. Since both the ionic liquids were molten at degrees below room temperature, hence they are considered as room temperature ionic liquids (RTILs).


Biodiesel from Citrullus colocynthis oil: sulfonic-ionic liquid-catalyzed esterification of a two-step process.

Ali Elsheikh Y, Hassan Akhtar F - ScientificWorldJournal (2014)

DSC curve for melting point determination of DSIMHSO4.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4060741&req=5

fig3: DSC curve for melting point determination of DSIMHSO4.
Mentions: The synthesized ionic liquids, DSIMHSO4 and MSIMHSO4, showed melting temperatures at 6 ± 0.2°C and −15 ± 0.2°C, respectively, presented in Figures 3 and 4. Since both the ionic liquids were molten at degrees below room temperature, hence they are considered as room temperature ionic liquids (RTILs).

Bottom Line: Based on the results, 3.6 wt% of DSIMHSO4, methanol/CCO molar ratio of 12 : 1, and 150 °C offered a final FFA conversion of 95.4% within 105 min.A 98.2% was produced via second KOH-catalyzed step in 1.0%, 6 : 1 molar ratio, 600 rpm, and 60 °C for 50 min.This new two-step catalyzed process could solve the corrosion and environmental problems associated with the current acidic catalysts.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Materials Engineering, King Abdulaziz University, P.O. Box 344, Rabigh, Saudi Arabia.

ABSTRACT
Biodiesel was prepared from Citrullus colocynthis oil (CCO) via a two-step process. The first esterification step was explored in two ionic liquids (ILs) with 1,3-disulfonic acid imidazolium hydrogen sulfate (DSIMHSO4) and 3-methyl-1-sulfonic acid imidazolium hydrogen sulfate (MSIMHSO4). Both ILs appeared to be good candidates to replace hazardous acidic catalyst due to their exceptional properties. However, the two sulfonic chains existing in DSIMHSO4 were found to increase the acidity to the IL than the single sulfonic chain in MSIMHSO4. Based on the results, 3.6 wt% of DSIMHSO4, methanol/CCO molar ratio of 12 : 1, and 150 °C offered a final FFA conversion of 95.4% within 105 min. A 98.2% was produced via second KOH-catalyzed step in 1.0%, 6 : 1 molar ratio, 600 rpm, and 60 °C for 50 min. This new two-step catalyzed process could solve the corrosion and environmental problems associated with the current acidic catalysts.

Show MeSH
Related in: MedlinePlus