Microencapsulated drag reducing agents

Details Microencapsulated drag reducing agents Microencapsulated drag reducing agents

1998-01-27

2000-10-03

Nutter, Nathan M.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

264 43, 264 432, 264 433, 264 44, 264 46, 264 47, 4272133, 42721331, 42721334, B01J 1302, B01J 1304, B01J 1320, B05D 700

Patent

active

061268720

ABSTRACT:
High concentration drag reducing agents may be prepared by microencapsulating polymer drag reducing agent. The microencapsulation may be performed prior to, during, or after the polymerization of monomer into effective drag reducing polymer. If encapsulation is done before or during polymerization, a catalyst may be present, but little or no solvent is required. The result is very small scale bulk polymerization within the microcapsule. The inert capsule or shell may be removed before, during or after introduction of the microencapsulated drag reducer into a flowing liquid. No injection probes or other special equipment is expected to be required to introduce the drag reducing slurry into the liquid stream, nor is grinding (cryogenic otherwise) of the polymer necessary to form a suitable drag reducing agent.

REFERENCES:
patent: 4588640 (1986-05-01), Matlach
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patent: 4693321 (1987-09-01), Royer
patent: 5504131 (1996-04-01), Smith et al.
patent: 5504132 (1996-04-01), Smith et al.
patent: 5539044 (1996-07-01), Dindi et al.
patent: 5605966 (1997-02-01), Schuler et al.
patent: 5733953 (1998-03-01), Fairchild et al.
J. Franjione, et al., "The Art and Science of Microencapsulation," Technology Today, Jun. 1995.

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