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Improving the cold flow properties of biodiesel from waste cooking oil by ternary blending with bio-based alcohols and diesel from direct coal liquefaction
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  • Yuan Xue,
  • Lihong Wang,
  • Hualin Lin,
  • Sheng Han,
  • Shiyou Zheng
Yuan Xue
Shanghai Institute of Technology
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Lihong Wang
Shanghai Urban Construction Vocational College
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Hualin Lin
Shanghai Institute of Technology
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Sheng Han
Shanghai Institute of Technology
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Shiyou Zheng
University of Shanghai for Science and Technology
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Abstract

The utilization and popularization of biodiesel are always limited by its poor cold flow properties. Both bio-based alcohol and diesel from direct coal liquefaction (DDCL) has potential to enhance the cold flow properties of biodiesel. Ternary blends of waste cooking oil biodiesel (BWCO) with DDCL and bio-based ethanol (ET) or 1-butanol (BT) for improving the cold flow properties of biodiesel. The pour point (PP), cold filter plugging point (CFPP), and cloud point (CP) of BWCO-ET, BWCO-BT, and BWCO-DDCL binary blends, and BWCO-ET-DDCL and BWCO-BT-DDCL ternary blends were comparatively assessed. Ternary phase diagrams were also applied into analyze the blending effect of the three components on the cold flow properties of biodiesel. Results showed that both DDCL, ET and BT can remarkably enhance the cold flow properties of BWCO. BT and DDCL presented a better synergistic depression effect. For ternary blends in 20:10:70 blending ratio, BWCO-BT-DDCL exhibited the lowest PP, CFPP, and CP of −23 °C, −19 °C, and −17 °C, respectively. The crystallization behavior and crystal morphology of blended fuels are also observed via a polarizing optical microscope, and find that DDCL together with BT in biodiesel can effectively retard the aggregation of large crystals and inhibit crystals growth.

Peer review status:IN REVISION

23 Mar 2021Submitted to Journal of the American Oil Chemists' Society
23 Mar 2021Submission Checks Completed
23 Mar 2021Assigned to Editor
12 Apr 2021Reviewer(s) Assigned
30 May 2021Review(s) Completed, Editorial Evaluation Pending
07 Jun 2021Editorial Decision: Revise Major
17 Jun 20211st Revision Received
17 Jun 2021Assigned to Editor
17 Jun 2021Submission Checks Completed