Selectively Wetting Low-density Polyethylene (LDPE)-coated Meshes for Use in Oil Spill Recovery Devices

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Selectively wetting low-density polyethylene (LDPE)-coated meshes for use in oil spill recovery devices
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Inventors
Professor Philip Gschwend
Department of Civil and Environmental Engineering, MIT
External Link (cee.mit.edu)
Daniel Prendergast
Department of Civil and Environmental Engineering, MIT
Professor Francesco Stellacci
Ecole Polytechnique Federale de Lausanne
Da Deng
Wayne State University
Roberto Bagatin
Eni S.p.A
Managed By
Jim Freedman
MIT Technology Licensing Officer - Chemicals, Instruments, Consumer Products
Patent Protection

Liquid Separation Device

US Patent Pending US 2015-0203371
Publications
Hydrophobic Meshes for Oil Spill Recovery Devices
Applied Materials and Interfaces, 2013, 5, 774−781

Applications

Selectively wetting LDPE-coated meshes provide a means for recovering spilled oil from surface water, resulting from accidental release of petrochemicals into water. Additional applications for hydrophobic and oleophilic meshes exist in the food production industry and chemical synthesis laboratories. 

Problem Addressed

Current methods for handling oil spills (e.g., skimming, burning, sorbents, dispersants) vary in terms of expense and effectiveness, are typically confined to a small area, tend to focus on cleanup at the expense of oil recovery, and can present significant challenges in terms of ease-of-use and safety. The use of selectively wetting substances to separate oil and water is an emerging approach. Functionalizing surfaces by applying coatings that are hydrophobic and oleophilic allows for the passage of oil while preventing water flow. These coatings, while effective, often lack durability and large-scale economic feasibility. Low-density polyethylene (LDPE)-coated meshes are durable and effective, in addition to being inexpensive to produce and remarkably energy efficient.

Technology

Oil-selective meshes are created by coating a supporting stainless steel wire mesh with LDPE, thus generating a hydrophobic and oleophilic surface that is suitable for oil-water separation. The thickness of the LDPE coating determines the size of the mesh pores, rendering them easily modifiable. At the appropriate pore size, which may vary and can be predicted depending on the environment, the amount of water intrusion and the rate of oil recovery are optimized. Oil is recovered based on capillary action and flows into a collection reservoir, requiring only external pumping to maintain the process. 

Advantages

  • Inexpensive and amenable to large-scale production
  • Separates oil with < 1.5% water content
  • Durable, easily cleaned, and reusable
  • Energy efficient
  • Stainless steel; structurally sound
  • Optimizable for a variety of conditions