NUS Enterprise

A Highly Hydrophilic and Oleophobic Membrane for Oil/Water Separation

Technology #11142n

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Researchers
Prof Bai Renbi
Managed By
Ms Yong Yoke Ping
Manager (65)66011680
Patent Protection

US Patent Pending
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Tech Offer 11142N Membrane for Oil-Water Separation [PDF]

A Highly Hydrophilic and Oleophobic Membrane for Oil/Water Separation

Applications

Oily Wastewater treatment

Patents

Patent pending

Opportunity

  • Licensing
  •  Partnership for further development

Contact

NUS Ref: 11142N

 Yong Yoke Ping (tel.: 65-660 11680)

 Email: iloyyp@nus.edu.sg or iloquery@nus.edu.sg

 Primary Inventor: Prof Bai Renbi

Advantages

  • Can separate dispersed and emulsified oil from oily wastewater
  • Strong resistance to oil fouling

Technology Overview

Effective and economical separation of oil from water is important in the oil and gas as well as the chemical processing industries. Conventional oily wastewater treatment cannot effectively remove oil to meet today’s effluent standards for discharge or reuse. Membrane is very promising for achieving high oil/water separation efficiency but it is often uneconomic because of severe membrane fouling by oil.

This invention relates to a novel high performance membrane for separating oil from water and has a high resistance to oil fouling. The membrane uses a special blend of a matrix polymer and an additive polymer.

The following figure and table show a magnified membrane and its performance respectively.


Figure 1: Cross section of membrane at 40x magnification.

 Feed

Palm oil 110ppm

Crude oil  500 ppm

Crude oil  500 ppm

Hexa-decane 500 ppm

Hexa-decane 500 ppm

Polymer blend conc. (wt. %)

20

18

20

18

20

Ratio (Primary polymer : additive polymer)

7:3

7:3

7:3

7:3

7:3

Transmembrane pressure (MPa)

0.34

0.34

0.34

0.34

0.34

Initial pure water flux (L/m2·h)

56.21

69.18

55.04

69.28

55.19

Retention percentage (%)

70

99

99

99

99

Filtration time (h)

2

2

2

2

2

Flux recovery after washing (%)

90

65

71

89

95

Table 1: Membrane performance on treatment of oily wastewater


Technology Features

  • High affinity to water but strong repulsion to oil
  • Large scale production of membrane possible