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Polyolefin drag reducing agents produced by non-cryogenic grinding

A drag reducer, polyolefin technology, used in thin material processing, coating, piping systems, etc.

Active Publication Date: 2010-03-24
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these existing methods has proven to be fully satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0029] Polyolefin polymers are ground into DRA granules in a dual pass process, passing through two processors or mills one after the other, wherein the impeller of the first processor is semi-open, and the impeller of the second processor is The impeller type is closed. yielded the following data:

[0030] Example #1

[0031] Particle size (mv) 259 microns

[0032] Particle size (D95) 493 microns

[0033] Example #2

[0034] Particle size (mv) 197 microns

[0035] Particle size (D95) 360 microns

[0036] Example #3

[0037] Particle size (mv) 268 microns

[0038] Particle size (D95) 497 microns

[0039] Example #4

[0040] Particle size (mv) 249 microns

[0041] Particle size (D95) 425 microns

[0042] "MV" refers to the mean diameter of the volume distribution and represents the center and center of gravity of the particle size distribution curve. The particle size given first is the final particle size after the second process, where "D95" means that about 95% o...

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PUM

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Abstract

Fine particulate polymer drag reducing agent (DRA) in bi-modal or multi-modal particle size distributions may be produced simply and efficiently without cryogenic temperatures. The grinding or pulverizing of polymer, such as poly(alpha-olefin) suitable for reducing drag in flowing hydrocarbons may be achieved by the use of at least one liquid grinding aid and at least two grinding processors in series. The impellers of the grinders are of different openness so that granulated polymer fed to the first processor having a relatively more open impeller is ground to an intermediate size which is fed to the second processor having a relatively more closed impeller which grinds the polymer to a second, smaller size. A non-limiting example of a suitable liquid grinding aid includes a blend of propylene glycol, water and hexanol. Particulate DRA may be produced at a size of about 300 microns or less in only two passes.

Description

technical field [0001] This invention relates to a method of producing polymeric drag reducers in the form of finely divided particles, and most particularly to grinding polymeric drag reducers in two or more processes that do not require grinding at cryogenic temperatures to produce their fine particle method. Background technique [0002] The use of poly-alphaolefins or copolymers thereof to reduce the resistance of hydrocarbons to flow through pipelines, and thereby reduce the energy requirements for the transport of such fluid hydrocarbons, is well known. In the past, these drag reducing agents, or DRAs, have taken various forms, including slurries or dispersions of ground polymers to form free-flowing and pumpable mixtures in liquid media. The problem commonly experienced with simply grinding polyalphaolefin (PAO) is that over time the particles can "cold flow" or stick together making it impossible to get the PAO at the proper surface area that will dissolve all Said...

Claims

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Application Information

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IPC IPC(8): B05D5/08
CPCF17D1/17Y10T137/0391
Inventor T·马修N·S·科马莱迪
Owner BAKER HUGHES INC
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