Carbon particles

Patent · Sun Jan 01 00:00:00 EST 1984

OSTI ID:865033

Hunt, Arlon J ^[1]

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1. Oakland, CA

A method and apparatus whereby small carbon particles are made by pyrolysis of a mixture of acetylene carried in argon. The mixture is injected through a nozzle into a heated tube. A small amount of air is added to the mixture. In order to prevent carbon build-up at the nozzle, the nozzle tip is externally cooled. The tube is also elongated sufficiently to assure efficient pyrolysis at the desired flow rates. A key feature of the method is that the acetylene and argon, for example, are premixed in a dilute ratio, and such mixture is injected while cool to minimize the agglomeration of the particles, which produces carbon particles with desired optical properties for use as a solar radiant heat absorber.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4452771
• OSTI ID: 865033
• Country of Publication: United States
• Language: English

Related Subjects

carbon
particles
method
apparatus
whereby
pyrolysis
mixture
acetylene
carried
argon
injected
nozzle
heated
tube
amount
air
added
prevent
build-up
tip
externally
cooled
elongated
sufficiently
assure
efficient
desired
flow
rates
key
feature
example
premixed
dilute
ratio
cool
minimize
agglomeration
produces
optical
properties
solar
radiant
heat
absorber
desired flow
nozzle tip
flow rates
flow rate
carbon particles
optical properties
radiant heat
apparatus whereby
solar radiant
key feature
/423/