Evaluation of catalytic activity of two functionalized imidazolium ionic liquids for biodiesel fuel production by a two-stage process

2013 ◽  
Vol 89 (7) ◽  
pp. 998-1006 ◽  
Author(s):  
Yasir A. Elsheikh ◽  
Zakaria Man ◽  
Azmi Bustam ◽  
Suzana Yusup ◽  
Faheem H. Akhtar ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Biodiesel Fuel ◽  
Fuel Production ◽  
Two Stage ◽  
Imidazolium Ionic Liquids ◽  
Stage Process

Catalytic Disproportionation of Chlorosilanes Using Imidazolium Ionic Liquids Deposited on Polymer Supports

2020 ◽  
Vol 20 (4) ◽  
pp. 247-259
Author(s):  
A. V. Vorotyntsev ◽  
A. N. Markov ◽  
A. N. Petukhov ◽  
V. I. Pryakhina ◽  
M. E. Atlaskina ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Chemical Activity ◽  
Porous Polymer ◽  
Catalytic Systems ◽  
Imidazolium Ionic Liquids ◽  
Polymer Supports

Highly selective catalytic systems with porous polymer supports immobilized with ionic liquids, which contained acceptor and donor substituents as well as various anions, were developed. Their effect on activity of the catalysts in disproportionation of trichlorosilane was studied. The catalytic activity of systems based on N-methoxy-4-methylimidazole with different counterions was shown to decrease with the growth of chemical activity of the anions from iodine to fluorine.

Estimation of Recoverable Household Waste Cooking Oil and Life Cycle Analysis of Biodiesel Fuel Production

2008 ◽  
Vol 4 (4) ◽  
pp. 318-323 ◽  
Author(s):  
Hirotsugu KAMAHARA ◽  
Shun YAMAGUCHI ◽  
Ryuichi TACHIBANA ◽  
Naohiro GOTO ◽  
Koichi FUJIE
Keyword(s):  
Life Cycle ◽  
Life Cycle Analysis ◽  
Waste Cooking Oil ◽  
Household Waste ◽  
Biodiesel Fuel ◽  
Fuel Production ◽  
Cooking Oil

scholarly journals Two-Stage Biodiesel Synthesis from Used Cooking Oil with a High Acid Value via an Ultrasound-Assisted Method

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3703
Author(s):  
Ming-Chien Hsiao ◽  
Wei-Ting Lin ◽  
Wei-Cheng Chiu ◽  
Shuhn-Shyurng Hou
Keyword(s):  
Acid Value ◽  
Molar Ratio ◽  
Optimal Conditions ◽  
Two Stage ◽  
Cooking Oil ◽  
High Acid ◽  
Used Cooking Oil ◽  
Biodiesel Synthesis ◽  
Stage Process ◽  
Ultrasound Assisted

In this study, ultrasound was used to accelerate two-stage (esterification–transesterification) catalytic synthesis of biodiesel from used cooking oil, which originally had a high acid value (4.35 mg KOH/g). In the first stage, acid-catalyzed esterification reaction conditions were developed with a 9:1 methanol/oil molar ratio, sulfuric acid dosage at 2 wt %, and a reaction temperature of 60 °C. Under ultrasound irradiation for 40 min, the acid value was effectively decreased from 4.35 to 1.67 mg KOH/g, which was decreased to a sufficient level (<2 mg KOH/g) to avoid the saponification problem for the subsequent transesterification reaction. In the following stage, base-catalyzed transesterification reactions were carried out with a 12:1 methanol/oil molar ratio, a sodium hydroxide dosage of 1 wt %, and a reaction temperature of 65 °C. Under ultrasound-assisted transesterification for 40 min, the conversion rate of biodiesel reached 97.05%, which met the requirement of EN 14214 standard, i.e., 96.5% minimum. In order to evaluate and explore the improvement of the ultrasound-assisted two-stage (esterification–transesterification) process in shortening the reaction time, additional two-stage biodiesel synthesis experiments using the traditional mechanical stirring method under the optimal conditions were further carried out in this study. It was found that, under the same optimal conditions, using the ultrasound-assisted two-stage process, the total reaction time was significantly reduced to only 80 min, which was much shorter than the total time required by the conventional method of 140 min. It is worth noting that compared with the traditional method without ultrasound, the intensification of the ultrasound-assisted two-stage process significantly shortened the total time from 140 min to 80 min, which is a reduction of 42.9%. It was concluded that the ultrasound-assisted two-stage (esterification–transesterification) catalytic process is an effective and time-saving method for synthesizing biodiesel from used cooking oil with a high acid value.

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