Zwitterionic surfacant together with an anionic...

Details Zwitterionic surfacant together with an anionic... Zwitterionic surfacant together with an anionic...

2011-08-02

2011-08-02

Metzmaier, Daniel S (Department: 1762)

Fluid handling

Processes

Affecting flow by the addition of material or energy

C516S113000, C516S200000, C516S203000, C252S078100, C252S079000, C510S490000

Reexamination Certificate

active

07987866

ABSTRACT:
The present invention relates to the use of a zwitterionic surfactant in combination with an ether sulphate or ether carboxylate surfactant in a water-based system as a drag-reducing agent. The combination has besides a high drag-reducing effect also a low sensitivity to hard water.

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International Preliminary Examination Report for International Application No. PCT/SE02/00059 dated Apr. 29, 2003.

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