Q1 Research Application · Frontier Focus

Microwave assisted esterification of acidified oil from waste cooking oil by CERP/PES catalytic membrane for biodiesel production

Published in Bioresource Technology (2012), this study used the XH-200A microwave reaction system to intensify CERP/PES catalytic membrane esterification of acidified waste cooking oil, reaching 97.4% FFAs conversion in 90 min.

View DOI Back to Library Chinese Solution
Paper ID 3
Application Focus Biodiesel, Waste cooking oil, CERP/PES catalytic membrane, Microwave-assisted esterification, Free-fatty-acid conversion, Green energy
Key Result FFAs conversion under MAE 97.4%
Core Condition Reaction temperature 60 °C
Paper ID
3
Journal
Bioresource Technology
Impact Factor
11.889
CAS Zone
Zone 1
Year
2012
DOI
10.1016/j.biortech.2012.06.082
Equipment Model
XH-200A / XH-200C
Affiliations
Shandong University of Technology; School of Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China
Research Directions
Biodiesel Waste cooking oil CERP/PES catalytic membrane Microwave-assisted esterification Free-fatty-acid conversion Green energy

Fact Snapshot

  • Paper: Microwave assisted esterification of acidified oil from waste cooking oil by CERP/PES catalytic membrane for biodiesel production
  • Equipment: XH-200A microwave accelerated reaction system
  • Journal and year: Bioresource Technology, 2012
  • Core conditions: 60 °C; methanol/acidified oil mass ratio 2.0:1; catalytic membrane loading 3 g; microwave power 360 W; reaction time 90 min
  • Key result: FFAs conversion reached 97.4%
  • Use case: biodiesel production from acidified waste cooking oil

Research Abstract

This study compared conventional heating and microwave-assisted esterification of acidified waste cooking oil using a CERP/PES catalytic membrane. Under the optimized microwave conditions of 60 °C, methanol/acidified oil mass ratio 2.0:1, 3 g catalytic membrane annealed at 120 °C, 360 W microwave power, and 90 min reaction time, FFAs conversion reached 97.4%. The results show that microwave irradiation provides a rapid, simple, and greener route for biodiesel production from high-FFA waste oil feedstocks.

Research Background and Problem

Waste cooking oil is an attractive low-cost biodiesel feedstock, but its high free fatty acid content prevents direct alkaline transesterification and creates separation, corrosion, and wastewater problems when homogeneous acids are used.

Equipment Use and Experimental Conditions

ItemParameter
Reaction temperature60 °C
Methanol/acidified oil mass ratio2.0:1
Catalytic membrane loading3 g, annealed at 120 °C
Microwave power360 W
Reaction time90 min
Temperature120°C / 50°C / 65°C
Time1 h / 8 h / 120 min

Key Result

FFAs conversion under MAE 97.4%
Conventional heating benchmark 98.4% after 8 h
Reaction-time reduction 5.3-fold shorter than conventional heating
Sixth reuse conversion for 120 °C… about 85.21%
MetricResult
FFAs conversion under MAE97.4%
Conventional heating benchmark98.4% after 8 h
Reaction-time reduction5.3-fold shorter than conventional heating
Sixth reuse conversion for 120 °C-annealed membraneabout 85.21%
Conversion85.21%
Conversion77.86%
Conversion90.87%
Conversion74.12%

Evidence Details

Equipment-detail evidence

Equipment-detail evidence: source values include 500 mL, 250 mL, 20 g, 120 min, 65°C, 2.0:1, 3 g, 360 W. Entities: XH-200A.

Activation-energy evidence

Activation-energy evidence: source values include 60°C, 65°C, 90 min, 8 h.

Energy-comparison evidence

Energy-comparison evidence: source values include 8 h.

Additional source evidence

Additional source evidence: source values include 200°C, 1 h, 77.86%, 50°C, 90.87%, 80°C, 94.98%, 120°C, 74.12%.

Microwave-method evidence

Microwave-method evidence: source values include 120 W, 360 W, 83.93%, 94.76%, 480 W, 94.7%, 600 W, 90.34%.

Abstract evidence

The FFAs conversion of microwave assisted esterification reached 97.4% under the optimal conditions of reaction temperature 60 °C, methanol/acidified oil mass ratio 2.0:1, catalytic membrane (annealed at 120 °C) loading 3 g, microwave power 360 W and reaction time 90 min.

Additional source evidence

Additional source evidence: source values include 56.54%, 95.92%, 2.5:1, 93.84%, 80.33%, 78.42%, 2.0:1.

Additional source evidence

Additional source evidence: source values include 100 mL, 20 g, 2.5:1, 29:1, 5 g, 65°C, 8 h.

Additional source evidence

Additional source evidence: source values include 1 g, 2 g, 64.3%, 81.65%, 5 g, 92.5%, 3 g.

Additional source evidence

Additional source evidence: source values include 250°C, 40 mL, 70°C, 240°C, 10°C, 10 min.

Additional source evidence

Additional source evidence: source values include 35°C, 60°C, 65°C, 70°C, 87.5%, 72.6%.

Composition evidence

Composition evidence: source values include 12:0, 14:0, 16:0, 18:2, 18:0. Entities: FAME.

Additional source evidence

Additional source evidence: source values include 8 h, 71.15%, 80.24%, 85.96%, 94%.

Microwave-method evidence

Microwave-method evidence: source values include 90 min, 97.4%, 8 h, 5.3fold.

Mechanism / Method Highlights

  • Microwave irradiation selectively heats polar reactants and speeds esterification kinetics.
  • The CERP/PES membrane supplies reusable heterogeneous acid sites.
  • Annealing at 120 °C improves membrane activity by removing absorbed water.
  • Excess methanol shifts the reversible esterification equilibrium toward FAME formation, but too much methanol dilutes the system.

Application Value

  • Shows a realistic microwave-assisted route for acidified waste cooking oil valorization.
  • Combines fast reaction, lower methanol demand, and heterogeneous catalyst recovery.
  • Provides a traceable Xianghu equipment case in biodiesel process intensification.

Related Equipment

XH-200A+ Microwave Solid-Liquid Phase Synthesis/Extraction System
XH-200A+ Microwave Solid-Liquid Phase Synthesis/Extraction System

FAQ

Which Xianghu instrument is cited in this paper?
The method section cites an XH-200A microwave accelerated reaction system from Beijing XiangHu Science and Technology Development Co. Ltd.
What is the core experimental result?
The microwave-assisted process reached 97.4% FFAs conversion under optimized conditions in 90 min.
Why is the study relevant for biodiesel production?
It addresses high-FFA waste cooking oil pretreatment using a faster, heterogeneous, and potentially greener esterification process.
Citation
Microwave assisted esterification of acidified oil from waste cooking oil by CERP/PES catalytic membrane for biodiesel production
Bioresource Technology, 2012
DOI: 10.1016/j.biortech.2012.06.082